CN114710214B - Communication reconnaissance system and amplitude-frequency response processing method and device thereof - Google Patents
Communication reconnaissance system and amplitude-frequency response processing method and device thereof Download PDFInfo
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Abstract
The application discloses a communication reconnaissance system and a amplitude-frequency response processing method and device thereof. The method of the application comprises the following steps: determining expected amplitude-frequency response of a compensation filter according to the amplitude-frequency response of a radio frequency receiving channel of a communication reconnaissance system, wherein the expected amplitude-frequency response of the compensation filter and the amplitude-frequency response of the radio frequency receiving channel are overlapped to meet a consistency condition, and the consistency condition means that an overlapped amplitude-frequency response curve is in a straight line; constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, wherein the compensation filter is a digital filter; and compensating the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent. The technical scheme of the application can improve the flatness of the amplitude-frequency response of the communication reconnaissance system and improve the signal monitoring precision.
Description
Technical Field
The application relates to the technical field of communication reconnaissance, in particular to a communication reconnaissance system and a amplitude-frequency response processing method and device thereof.
Background
Electromagnetic spectrum monitoring is one of main tasks of communication reconnaissance, as shown in fig. 1, a communication reconnaissance system generally comprises two parts of radio frequency receiving and data processing, wherein the radio frequency receiving comprises an antenna feeder system, a radio frequency receiving front end and the like, and the radio frequency receiving front end comprises more complex circuits such as signal amplification, frequency conversion, filtering and the like. When the frequency band is wider, the antenna feed system and the radio frequency receiving front end have inconsistency of amplitude-frequency response in the instantaneous frequency band, and communication reconnaissance generally judges whether signals exist or not through a means of monitoring a broadband frequency spectrum by setting a threshold, and the best monitoring effect can be achieved only by requiring the consistency of the amplitude-frequency response of the instantaneous frequency band.
Disclosure of Invention
The embodiment of the application provides a communication reconnaissance system and a amplitude-frequency response processing method and device thereof, which are used for improving the flatness of the amplitude-frequency response of the communication reconnaissance system and improving the signal monitoring precision.
The embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for processing an amplitude-frequency response of a communication reconnaissance system, including:
Determining expected amplitude-frequency response of a compensation filter according to the amplitude-frequency response of a radio frequency receiving channel of a communication reconnaissance system, wherein the expected amplitude-frequency response and the amplitude-frequency response of the radio frequency receiving channel are overlapped and then meet a consistency condition, and the consistency condition means that an overlapped amplitude-frequency response curve is in a straight line;
constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, wherein the compensation filter is a digital filter;
And compensating the amplitude-frequency response error of the radio frequency receiving channel by adopting the constructed compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
In some embodiments, when constructing the compensation filter, further comprising:
Determining a cost function according to the deviation condition of the amplitude-frequency response of the compensated radio frequency receiving channel, and generating a chromosome variable according to the filter coefficient;
and searching and calculating the chromosome variable by adopting a genetic optimization algorithm, and obtaining an optimized filter coefficient when the cost function reaches an expected value.
In some embodiments, optimizing the filter coefficients of the compensation filter using a preset algorithm further comprises:
Obtaining a memory bank of an immune algorithm, wherein each generation of excellent individuals are stored in the memory bank;
and when the chromosome variable is searched and calculated by adopting a genetic optimization algorithm, each generation of excellent individuals in the memory library are utilized to mutate the next generation of excellent individuals.
In some embodiments, the consistency condition means that the superimposed amplitude-frequency response curves are in a straight line, and the determining the expected amplitude-frequency response of the compensation filter according to the amplitude-frequency response of the radio frequency receiving channel of the communication reconnaissance system includes:
Measuring an amplitude-frequency response curve of a radio frequency receiving channel of the communication reconnaissance system;
And determining an expected amplitude-frequency response curve of the compensation filter according to the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system and the superimposed amplitude-frequency response curve.
In some embodiments, measuring an amplitude-frequency response curve of a radio frequency receive channel of the communication scout system includes:
receiving signals by using a communication reconnaissance system to obtain the frequency and the amplitude of the received signals;
And determining an amplitude-frequency response curve of the radio frequency receiving channel according to the frequency and the amplitude of the received signal.
In some embodiments, constructing the compensation filter according to the desired amplitude-frequency response of the compensation filter further comprises:
Constructing a compensation filter according to a desired amplitude-frequency response of the compensation filter and a filter definition condition, wherein the filter definition condition comprises: the flatness of the amplitude-frequency response of the compensated radio frequency receiving channel is in a set range, and the order of the compensation filter is smaller than a preset value.
In a second aspect, an embodiment of the present application further provides an amplitude-frequency response processing device of a communication reconnaissance system, including:
The first calculation unit is used for determining expected amplitude-frequency response of the compensation filter according to the amplitude-frequency response of the radio frequency receiving channel of the communication reconnaissance system, wherein the expected amplitude-frequency response and the amplitude-frequency response of the radio frequency receiving channel are overlapped and then meet the consistency condition, and the consistency condition means that the overlapped amplitude-frequency response curve is in a straight line;
A second calculation unit, configured to construct a compensation filter according to the expected amplitude-frequency response of the compensation filter, where the compensation filter is a digital filter;
And the compensation unit is used for compensating the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
In some embodiments, the first computing unit is further configured to measure an amplitude-frequency response curve of a radio frequency receiving channel of the communication scout system; and determining an expected amplitude-frequency response curve of the compensation filter according to the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system and the superimposed amplitude-frequency response curve.
In some embodiments, the first computing unit is further configured to receive a signal using the communication scout system, and obtain a frequency and an amplitude of the received signal; and determining an amplitude-frequency response curve of the radio frequency receiving channel according to the frequency and the amplitude of the received signal.
In a third aspect, an embodiment of the present application further provides a communication reconnaissance system, including an antenna feeder system, a radio frequency receiving front end, and a digital processing terminal, where the digital processing terminal includes:
A processor; and a memory arranged to store computer executable instructions that, when executed, cause the processor to perform the amplitude-frequency response processing method of the communication scout system of the above embodiment.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects: the communication reconnaissance system and the amplitude-frequency response processing method and device thereof utilize the digitized compensation filter to correct the error of the amplitude-frequency response of the radio frequency receiving channel of the communication reconnaissance system, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent. The embodiment of the application adopts a digital filtering method to carry out compensation correction, can improve the signal detection precision of the communication reconnaissance system, has simple and efficient processing method and is easy to realize.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of a communication reconnaissance system;
FIG. 2 is a schematic diagram of an amplitude-frequency response of a radio frequency receiving channel of the communication reconnaissance system of FIG. 1;
FIG. 3 is a flow chart of a method for processing an amplitude-frequency response of the communication reconnaissance system according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a communication reconnaissance system shown in one embodiment of the present application;
FIG. 5 is a diagram of an amplitude-frequency response test framework for a radio frequency receive channel according to one embodiment of the present application;
FIG. 6 is a schematic diagram of the desired amplitude-frequency response of the compensation filter shown in one embodiment of the application;
FIG. 7 is a schematic diagram of the amplitude-frequency response of the compensated RF receive path according to one embodiment of the present application;
FIG. 8 is a schematic diagram showing the amplitude-frequency response of the RF receiving channel after compensation processing based on the optimized compensation filter according to one embodiment of the present application;
FIG. 9 is a schematic diagram of an amplitude-frequency response processing device of the communication reconnaissance system according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a communication reconnaissance system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
As described above, in the communication reconnaissance system shown in fig. 1, for example, the electromagnetic signal is generally subjected to processing such as amplification and frequency conversion by the radio frequency front end after being received by the antenna feeder system, and then is sent to the digital processing terminal, and is digitized by the digital processing terminal through the ADC (Analog to Digital Converter, also called analog-to-digital converter) and then is subjected to processing such as panoramic spectrum estimation, display, modulation recognition, demodulation, and the like.
Because the antenna feed system, the radio frequency receiving front end and the analog circuit of the ADC comprise more complex circuits such as signal amplification, frequency conversion, filtering and the like. When the frequency band of the electromagnetic signal is wider, for example, a signal larger than 1MHz, the antenna feed system and the radio frequency receiving front end have larger amplitude-frequency response inconsistency in the instantaneous frequency band. It has been found that instantaneous bandwidths above 20MHz are typically uneven by more than 2 dB.
As shown in the amplitude-frequency response diagram of the 20MHz bandwidth shown in FIG. 2, the abscissa in the diagram is frequency, the interval of each point is 100KHz, the ordinate amplitude (in dB) is smaller as the frequency is higher, the middle of the amplitude is also provided with certain fluctuation, and the overall unevenness exceeds 2dB. The unevenness or inconsistency of the amplitude-frequency response has a great influence on the subsequent panoramic spectrum detection, and also has a certain influence on the identification and demodulation of broadband signals.
In the prior art, aiming at the problem of inconsistent amplitude-frequency response of the radio frequency receiving channel of the broadband signal, a correction filter network is usually added in the radio frequency receiving channel. The method has certain effects, but the defects are obvious: firstly, a filter network is complex, the precision is difficult to ensure, and adverse effects of various factors such as signal to noise ratio, volume and the like can be generated; secondly, the radio frequency front end can be matched with different antenna feed systems, and filter networks with different matching requirements are also different, so that the universality and the flexibility of the system are affected.
In the prior art, there is also a panoramic spectrum correction method, namely, a panoramic spectrum background threshold is first manufactured, and then the background threshold is subtracted from the actual spectrum when the panoramic spectrum is displayed. The method has higher requirements on the manufacture of the spectrum background threshold, and is effective when no space electromagnetic signal is input, but has poorer effect when the space electromagnetic signal is complex.
In view of the above description, the embodiment of the application provides a method for processing the amplitude-frequency response of a communication reconnaissance system, which adds a digital filter in a digital processing terminal to correct and compensate the amplitude-frequency response of a radio frequency receiving channel.
Fig. 3 is a flow chart of an amplitude-frequency response processing method of the communication reconnaissance system according to an embodiment of the present application, and as shown in fig. 3, the method according to an embodiment of the present application at least includes the following steps S310 to S330:
Step S310, determining the expected amplitude-frequency response of the compensation filter according to the amplitude-frequency response of the radio frequency receiving channel of the communication reconnaissance system, wherein the expected amplitude-frequency response and the amplitude-frequency response of the radio frequency receiving channel are overlapped and then meet the consistency condition, and the consistency condition means that the overlapped amplitude-frequency response curve is in a straight line.
The consistency condition of this embodiment is understood to be that the superimposed amplitude-frequency response curve obtained by superimposing the desired amplitude-frequency response of the compensation filter and the amplitude-frequency response of the radio frequency receiving channel is a straight line. In compensating the amplitude-frequency response of the radio frequency receiving channel based on the desired amplitude-frequency response, the amplitude-frequency response of the radio frequency receiving channel after compensation may be ideally aligned. However, due to errors introduced by the compensation filter and various system errors, in practical application, the unevenness of the amplitude-frequency response of the compensated radio frequency receiving channel is small, so that the electromagnetic signal reconnaissance precision can be satisfied, and the unevenness can be within +/-0.5 dB, for example.
It should be noted that, the radio frequency receiving channel of the communication reconnaissance system in this embodiment includes a signal channel composed of an antenna feeder system, a radio frequency receiving front end and an analog circuit in the digital processing terminal.
Step S320, constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, wherein the compensation filter is a digital filter.
Step S330, the amplitude-frequency response error of the radio frequency receiving channel is compensated by using the constructed compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
The built compensation filter is arranged at a digital processing terminal of the communication reconnaissance system, as shown in fig. 4, the compensation filter is connected behind the ADC, the ADC is utilized to convert the analog signal of the radio frequency receiving channel into a digital signal, and then the digital receiving signal after the ADC is subjected to filtering processing by the digitized compensation filter, so that the amplitude-frequency response of the subsequent panoramic spectrum is ensured to be flat and consistent.
As shown in fig. 4, the embodiment of the present application adds a compensation filter in the exemplary communication reconnaissance system shown in fig. 1, and the compensation filter can compensate the amplitude-frequency response error of the radio frequency receiving channel, so that the amplitude-frequency response of the subsequent panoramic spectrum is flat and consistent, thereby improving the signal detection accuracy. In addition, for the broadband signal, the in-band amplitude-frequency response can be improved, so that the recognition and demodulation performance of the broadband signal can be improved. The amplitude-frequency response processing method of the embodiment of the application is simple and efficient and is easy to realize.
In some embodiments, constructing the compensation filter according to the desired amplitude-frequency response of the compensation filter further comprises: constructing a compensation filter according to a desired amplitude-frequency response of the compensation filter and a filter definition condition, wherein the filter definition condition comprises: the flatness of the amplitude-frequency response of the compensated radio frequency receiving channel is in a set range, and the order of the compensation filter is smaller than a preset value.
Specifically, when designing the filter, the present embodiment combines the system performance and the computation of the processor. When the amplitude-frequency response in the passband after compensation is smaller than +/-0.5 dB, the influence on the reconnaissance performance of the system is negligible; the operand is related to the order of the filter, and the order of the filter is reduced as much as possible under the condition of meeting the system performance. The higher the filter order is, the better the compensation effect is, and the higher the calculation amount is. Therefore, in practical applications, the filter should be designed in combination with the filter order and the system performance.
In some embodiments, the filter definition conditions should include: the flatness of the amplitude-frequency response of the compensated radio frequency receiving channel is set within a set range, for example, the flatness of the amplitude-frequency response of the compensated radio frequency receiving channel is within +/-0.5 dB, and the set range is set according to the performance requirement of the communication reconnaissance system in practical application and is not limited to +/-0.5 dB.
The filter defining condition should further include that the order of the compensation filter is smaller than a preset value.
FPGAs (Field Programmable GATE ARRAY, also known as field programmable gate arrays) have evolved from mask programmable gate arrays (FPGAs) and PLDs (Programmable Logic Device, also known as programmable logic devices), which have both the high logic density and versatility of mask programmable gate arrays and the user programmable nature of PLDs. The development of FPGA technology has led to an increasing number of logic gates integrated on a single chip, and the functions that can be implemented are more and more complex. The method is designed and developed through a hardware programming method, so that the development speed of the chip is greatly improved, and the development cost is reduced. The main operation of the current digital processing terminal is generally implemented in an FPGA, and the processing of filtering, FFT (Fast Fourier Transform, also called fast fourier transform), frequency conversion, etc. of the digital processing terminal related to spectrum estimation, demodulation, etc. of fig. 4 is mainly implemented by the FPGA.
In this embodiment, the number of orders of the compensation filter is limited to be smaller than a set value, for example, smaller than 10 orders, so that the compensation filter is ensured to be easily implemented in the FPGA, and the resource occupation of the FPGA is reduced.
The compensation filter of the embodiment of the application is an FIR digital filter. Digital filters can be classified into FIR (Finite Impulse Response, also known as finite impulse response) filters and IIR (Infinite Impulse Response, also known as infinite impulse response) filters. The FIR filter has good stability, selectable linear phase characteristics, strong flexibility and high adaptability, so that the FIR filter is more suitable for communication reconnaissance.
The consistency condition in the embodiment of the application means that the superimposed amplitude-frequency response curves are in a straight line, and in some embodiments, the determining the expected amplitude-frequency response of the compensation filter according to the amplitude-frequency response of the radio frequency receiving channel of the communication reconnaissance system includes: measuring an amplitude-frequency response curve of a radio frequency receiving channel of the communication reconnaissance system; and determining the expected amplitude-frequency response curve according to the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system and the superimposed amplitude-frequency response curve.
The step of measuring the amplitude-frequency response of the radio frequency receiving channel comprises the following steps: receiving signals by using a communication reconnaissance system to obtain the frequency and the amplitude of the received signals; determining an amplitude-frequency response curve of the radio frequency receiving channel according to the frequency and the amplitude of the received signal
As shown in fig. 5, test equipment and instruments are first set up, and a place and a period of time with small electromagnetic interference are selected, for example, the test equipment and the instruments can be performed in a microwave dark room. Then the signal source transmits signals, the panoramic spectrum software observes the received signals, measures frequency and amplitude and records data. And finally, drawing an amplitude-frequency response curve of the system according to the recorded data. For example, the amplitude-frequency response of the system is measured every 100KHz to obtain an amplitude-frequency response curve shown in fig. 2, in which the abscissa in fig. 2 is the frequency, 200 frequency points, the bandwidth of each frequency point is 100KHz, and the ordinate is the amplitude (in dB).
In the process of measuring the amplitude-frequency response of the radio frequency receiving channel, the signal sampling interval can be flexibly set according to the precision requirement, is not limited to 100KHz, and can measure the amplitude-frequency response of a system at intervals of 50KHz to obtain a higher-precision amplitude-frequency response curve.
After the amplitude-frequency response of the radio frequency receiving channel of the communication reconnaissance system is obtained, the expected amplitude-frequency response of the compensation filter can be calculated according to the consistency condition, so that the expected amplitude-frequency response curve shown in fig. 6 and the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system shown in fig. 2 are overlapped to form a straight line.
The compensation filter is then constructed based on the desired amplitude-frequency response and the filter constraints described above, including designing the filter coefficients and filter orders of the compensation filter.
In some embodiments, for example, a compensation filter is designed by Matlab software, a 9-order FIR filter is used, the compensated amplitude-frequency response is about + -0.55 dB as shown in FIG. 7, and the compensated amplitude-frequency response is greater than the set range of + -0.5 dB, for example, in the filter definition.
In response to this problem, in some embodiments, a preset algorithm may also be used to optimize the filter coefficients of the compensation filter when constructing the compensation filter.
For example, determining a cost function according to the deviation of the amplitude-frequency response of the compensated radio frequency receiving channel, and generating a chromosome variable according to the filter coefficient; and searching and calculating the chromosome variable by adopting a genetic optimization algorithm, and obtaining an optimized filter coefficient when the cost function reaches an expected value.
The genetic algorithm is a global random search algorithm which is evolved by referring to the evolution law of the biological kingdom, and is an iterative process for realizing individual structure recombination in a population by applying genetic operations, such as selection, crossing, mutation and the like, to individuals on the basis of a cost function. In this process, the solutions of the population individual problems are optimized and gradually approximated instead.
The genetic algorithm is a global search algorithm with strong robustness for a complex system optimization technology, and the genetic algorithm is used for coding, calculating cost, copying, crossing, mutation, winner and winner eliminating strategy, feasibility judgment and other processes, and binary or real number coding is generally adopted.
In the embodiment of the application, the filter coefficients of the compensation filter are used as chromosome variables to search and optimize respectively, the filter coefficients of the initial compensation filter constructed based on the expected amplitude-frequency response and the filter limiting conditions are used as initial values, and the variant individual is selected in a random mode, for example, the variant individual is generated by adding a random number to the original individual.
In some embodiments, to increase convergence speed, genetic and immune algorithms are combined. Introducing a memory bank of an immune algorithm, storing excellent individuals of each generation into the memory bank, directly calling the excellent individuals of each generation during offspring operation, and actively mutating some individuals from the excellent individuals of each generation to serve as individuals of the next generation.
Specifically, a memory bank of an immune algorithm is obtained, and excellent individuals of each generation are stored in the memory bank; and when the chromosome variable is searched and calculated by adopting a genetic optimization algorithm, each generation of excellent individuals in the memory library are utilized to mutate the next generation of excellent individuals.
In the embodiment, a genetic algorithm and an immune algorithm are combined, the amplitude-frequency response deviation maximum value of the instantaneous bandwidth of the radio frequency receiving channel after compensation is used as a cost function, the cost function is minimized, and the optimized filter coefficient is obtained through searching and calculating. After the radio frequency receiving channel is compensated based on the optimized compensation filter, the amplitude-frequency response shown in fig. 8 is obtained, the flatness of the amplitude-frequency response in fig. 8 is within +/-0.45 dB, and the filter limiting condition is met.
According to the embodiment, the cost brought by the compensation filter is considered, the filter coefficient is optimized by adopting an optimization algorithm, the order of the filter is reduced as much as possible, the system performance is met, the newly added compensation filter occupies less resources of the equipment, and the applicability of the digital processing terminal is improved.
Of course, in practical application, other algorithms may be selected to optimize the filter coefficients, and those skilled in the art can flexibly select the filter coefficients.
The embodiment of the application also provides a device for processing the amplitude-frequency response of the communication reconnaissance system, which is used for realizing the method for processing the amplitude-frequency response of the communication reconnaissance system in any embodiment.
Fig. 9 is a diagram of an amplitude-frequency response test framework for a radio frequency receive channel according to one embodiment of the present application. As shown in fig. 9, the amplitude-frequency response processing apparatus 900 includes:
A first calculating unit 910, configured to determine an expected amplitude-frequency response of the compensation filter according to an amplitude-frequency response of a radio frequency receiving channel of the communication reconnaissance system, where the expected amplitude-frequency response and the amplitude-frequency response of the radio frequency receiving channel are overlapped and then meet a consistency condition, and the consistency condition refers to that an overlapped amplitude-frequency response curve is in a straight line;
a second calculation unit 920, configured to construct a compensation filter according to the expected amplitude-frequency response of the compensation filter;
And the compensating unit 930 is configured to compensate the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensating filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
In some embodiments, the amplitude-frequency response processing apparatus 900 further includes: an optimizing unit;
and the optimizing unit is used for optimizing the filter coefficient of the compensation filter by adopting a preset algorithm.
In some embodiments, the optimizing unit is configured to determine a cost function according to a deviation condition of an amplitude-frequency response of the compensated radio frequency receiving channel, and generate a chromosome variable according to the filter coefficient; and searching and calculating the chromosome variable by adopting a genetic optimization algorithm, and obtaining an optimized filter coefficient when the cost function reaches an expected value.
In some embodiments, the optimizing unit is further configured to obtain a memory bank of the immune algorithm, where each generation of excellent individuals are stored; and when the chromosome variable is searched and calculated by adopting a genetic optimization algorithm, each generation of excellent individuals in the memory library are utilized to mutate the next generation of excellent individuals.
In some embodiments, the consistency condition refers to that the superimposed amplitude-frequency response curves are in a straight line, and the first calculating unit 910 is configured to measure the amplitude-frequency response curves of the radio frequency receiving channels of the communication reconnaissance system; and determining an expected amplitude-frequency response curve of the compensation filter according to the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system and the superimposed amplitude-frequency response curve.
In some embodiments, the first calculating unit 910 is further configured to receive a signal with the communication scout system, and obtain a frequency and an amplitude of the received signal; and determining an amplitude-frequency response curve of the radio frequency receiving channel according to the frequency and the amplitude of the received signal.
It can be understood that the above-mentioned amplitude-frequency response processing device can implement each step of the amplitude-frequency response processing method provided in the foregoing embodiment, and the explanation about the amplitude-frequency response processing method is applicable to the amplitude-frequency response processing device, which is not repeated here.
Fig. 10 is a schematic structural diagram of a communication reconnaissance system according to an embodiment of the present application. Referring to fig. 10, at the hardware level, the communication reconnaissance system includes an antenna feeder system, a radio frequency receiving front end, and a digital processing terminal, where the digital processing terminal includes a processor and a memory, and optionally further includes an internal bus and a network interface. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least 1 disk Memory. Of course, the communication scout system may also include hardware required for other services.
The processor, network interface, and memory may be interconnected by an internal bus, which may be an ISA (Industry Standard Architecture ) bus, a PCI (PERIPHERAL COMPONENT INTERCONNECT, peripheral component interconnect standard) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 10, but not only one bus or type of bus.
And the memory is used for storing programs. In particular, the program may include program code including computer-operating instructions. The memory may include memory and non-volatile storage and provide instructions and data to the processor.
The processor reads the corresponding computer program from the nonvolatile memory to the memory and then runs, and a amplitude-frequency response processing device of the communication reconnaissance system is formed on a logic level. The processor is used for executing the programs stored in the memory and is specifically used for executing the following operations:
Determining expected amplitude-frequency response of a compensation filter according to the amplitude-frequency response of a radio frequency receiving channel of a communication reconnaissance system, wherein the expected amplitude-frequency response and the amplitude-frequency response of the radio frequency receiving channel are overlapped and then meet a consistency condition, and the consistency condition means that an overlapped amplitude-frequency response curve is in a straight line;
constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, wherein the compensation filter is a digital filter;
And compensating the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
The method executed by the amplitude-frequency response processing device of the communication reconnaissance system disclosed in the embodiment of fig. 3 of the present application can be applied to a processor or implemented by the processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but may also be a digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or other Programmable logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is positioned in the memory, the processor reads the information in the memory, and the amplitude-frequency response processing method of the communication reconnaissance system is completed by combining the hardware of the processor.
The communication reconnaissance system may further execute the method executed by the amplitude-frequency response processing device of the communication reconnaissance system in fig. 3, and implement the function of the amplitude-frequency response processing device of the communication reconnaissance system in the embodiment shown in fig. 3, which is not described herein.
The embodiment of the present application also proposes a computer readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a communication scout system including a plurality of application programs, enable the communication scout system to perform a method performed by a amplitude-frequency response processing apparatus of the communication scout system in the embodiment shown in fig. 3, and specifically configured to perform:
Determining expected amplitude-frequency response of a compensation filter according to the amplitude-frequency response of a radio frequency receiving channel of a communication reconnaissance system, wherein the expected amplitude-frequency response and the amplitude-frequency response of the radio frequency receiving channel are overlapped and then meet a consistency condition, and the consistency condition means that an overlapped amplitude-frequency response curve is in a straight line;
constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, wherein the compensation filter is a digital filter;
And compensating the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. A method for processing an amplitude-frequency response of a communication reconnaissance system, the method comprising:
Determining expected amplitude-frequency response of a compensation filter according to the amplitude-frequency response of a radio frequency receiving channel of a communication reconnaissance system, wherein the expected amplitude-frequency response of the compensation filter and the amplitude-frequency response of the radio frequency receiving channel are overlapped to meet a consistency condition, the consistency condition means that an overlapped amplitude-frequency response curve is in a straight line, and the radio frequency receiving channel comprises a signal channel consisting of an antenna feed system, a radio frequency receiving front end and an analog circuit in a digital processing terminal;
Constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, wherein the compensation filter is a digital filter, and the compensation filter is connected behind an analog-to-digital converter of the digital processing terminal;
And compensating the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensation filter, specifically, after the analog-to-digital converter converts the analog signal of the radio frequency receiving channel into a digital signal, filtering the digital receiving signal after the analog-to-digital converter by using the compensation filter, so that the amplitude-frequency response of the compensated radio frequency receiving channel tends to be flat and consistent.
2. The method of claim 1, wherein in constructing the compensation filter, further comprising:
Determining a cost function according to the deviation condition of the amplitude-frequency response of the compensated radio frequency receiving channel, and generating a chromosome variable according to the filter coefficient;
and searching and calculating the chromosome variable by adopting a genetic optimization algorithm, and obtaining an optimized filter coefficient when the cost function reaches an expected value.
3. The method of claim 2, wherein optimizing the filter coefficients of the compensation filter using a preset algorithm further comprises:
Obtaining a memory bank of an immune algorithm, wherein each generation of excellent individuals are stored in the memory bank;
and when the chromosome variable is searched and calculated by adopting a genetic optimization algorithm, each generation of excellent individuals in the memory library are utilized to mutate the next generation of excellent individuals.
4. The method of claim 1, wherein determining the desired amplitude-frequency response of the compensation filter based on the amplitude-frequency response of the radio frequency receive channel of the communication scout system comprises:
Measuring an amplitude-frequency response curve of a radio frequency receiving channel of the communication reconnaissance system;
And determining an expected amplitude-frequency response curve of the compensation filter according to the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system and the superimposed amplitude-frequency response curve.
5. The method of claim 4, wherein measuring the amplitude-frequency response curve of the radio frequency receive channel of the communication scout system comprises:
receiving signals by using a communication reconnaissance system to obtain the frequency and the amplitude of the received signals;
And determining an amplitude-frequency response curve of the radio frequency receiving channel according to the frequency and the amplitude of the received signal.
6. The method of claim 1, wherein constructing a compensation filter based on the desired amplitude-frequency response of the compensation filter, further comprises:
Constructing a compensation filter according to a desired amplitude-frequency response of the compensation filter and a filter definition condition, wherein the filter definition condition comprises: the flatness of the amplitude-frequency response of the compensated radio frequency receiving channel is in a set range, and the order of the compensation filter is smaller than a preset value.
7. An amplitude-frequency response processing device of a communication reconnaissance system, the device comprising:
The system comprises a first calculation unit, a compensation filter and a digital processing terminal, wherein the first calculation unit is used for determining expected amplitude-frequency response according to the amplitude-frequency response of a radio frequency receiving channel of a communication reconnaissance system, and the expected amplitude-frequency response of the compensation filter and the amplitude-frequency response of the radio frequency receiving channel are overlapped to meet consistency conditions, the consistency conditions are that an overlapped amplitude-frequency response curve is in a straight line, and the radio frequency receiving channel comprises a signal channel formed by an antenna feed system, a radio frequency receiving front end and an analog circuit in the digital processing terminal;
the second calculation unit is used for constructing a compensation filter according to the expected amplitude-frequency response of the compensation filter, the compensation filter is a digital filter, and the compensation filter is connected behind an analog-digital converter of the digital processing terminal;
The compensation unit is used for compensating the amplitude-frequency response error of the radio frequency receiving channel by using the constructed compensation filter, specifically, the analog-to-digital converter converts the analog signal of the radio frequency receiving channel into a digital signal, and then the compensation filter is used for filtering the digital receiving signal after the analog-to-digital converter so that the amplitude-frequency response of the radio frequency receiving channel after the compensation tends to be flat and consistent.
8. The apparatus of claim 7, wherein the first computing unit is further configured to measure a magnitude-frequency response curve of a radio frequency receive channel of the communication reconnaissance system; and determining an expected amplitude-frequency response curve of the compensation filter according to the amplitude-frequency response curve of the radio frequency receiving channel of the communication reconnaissance system and the superimposed amplitude-frequency response curve.
9. The apparatus of claim 8, wherein the first computing unit is further configured to receive the signal with a communication scout system to obtain a frequency and an amplitude of the received signal; and determining an amplitude-frequency response curve of the radio frequency receiving channel according to the frequency and the amplitude of the received signal.
10. The communication reconnaissance system comprises an antenna feed system, a radio frequency receiving front end and a digital processing terminal, wherein the digital processing terminal comprises:
A processor;
and a memory arranged to store computer executable instructions which, when executed, cause the processor to perform the amplitude-frequency response processing method of the communication spying system of any one of claims 1-6.
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| FR3152934A1 (en) * | 2023-09-12 | 2025-03-14 | Thales | Method for calculating compensation coefficients of an analog reception chain, device and corresponding program |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156604A (en) * | 2014-08-15 | 2014-11-19 | 天津大学 | Filter boundary frequency band control method and device based on genetic algorithm |
| CN108011615A (en) * | 2017-12-25 | 2018-05-08 | 北京怡和嘉业医疗科技股份有限公司 | A kind of method and apparatus of signal processing |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1815698C (en) * | 1990-03-30 | 1993-05-15 | Конструкторское бюро Московского производственного объединения "Салют" | Two-band filter |
| DE4419819A1 (en) * | 1994-06-07 | 1995-12-14 | Spang Linda Dipl Ing | Audio frequency filter and method for determining the filter function of an audio frequency filter |
| CN101706522A (en) * | 2009-11-13 | 2010-05-12 | 电子科技大学 | Bandwidth compensating device of channel of digital oscilloscope |
| CN101882237A (en) * | 2010-05-14 | 2010-11-10 | 长沙理工大学 | An Improved Immune-Particle Swarm Optimization Algorithm |
| US8837654B2 (en) * | 2012-06-08 | 2014-09-16 | Deere & Company | Signal receiver with group delay and amplitude distortion compensation |
| CN104283527B (en) * | 2014-08-28 | 2017-05-03 | 天津大学 | Method and device for configuring boundary frequency band of efficient filter rapidly |
| US10031207B2 (en) * | 2015-03-11 | 2018-07-24 | Raytheon Company | Wideband channel equalization for signals propagated in lossy transmission media |
| CN109164447B (en) * | 2018-09-26 | 2022-01-07 | 安徽博微长安电子有限公司 | Electromagnetic spectrum reconnaissance device of L-band low-altitude monitoring radar |
| CN109617631B (en) * | 2018-12-28 | 2021-09-14 | 华航高科(北京)技术有限公司 | Adaptive receiving method of reconnaissance system based on digital channelized instantaneous parameter measurement |
| CN109871581A (en) * | 2019-01-11 | 2019-06-11 | 中国船舶重工集团公司第七二四研究所 | A kind of double FIR digital compensation methods of broadband signal amplitude |
| CN110336572B (en) * | 2019-06-11 | 2020-09-15 | 三维通信股份有限公司 | Gain flatness compensation method for transceiver |
| CN111308224B (en) * | 2020-02-24 | 2021-02-05 | 山东大学 | Signal flatness compensation method of radio astronomical receiver and radio astronomical receiver |
-
2022
- 2022-03-21 CN CN202210280721.7A patent/CN114710214B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156604A (en) * | 2014-08-15 | 2014-11-19 | 天津大学 | Filter boundary frequency band control method and device based on genetic algorithm |
| CN108011615A (en) * | 2017-12-25 | 2018-05-08 | 北京怡和嘉业医疗科技股份有限公司 | A kind of method and apparatus of signal processing |
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