CN105553915B - Demodulation method for transient modulation parameters of intermittent radiation signals - Google Patents
Demodulation method for transient modulation parameters of intermittent radiation signals Download PDFInfo
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- CN105553915B CN105553915B CN201510908254.8A CN201510908254A CN105553915B CN 105553915 B CN105553915 B CN 105553915B CN 201510908254 A CN201510908254 A CN 201510908254A CN 105553915 B CN105553915 B CN 105553915B
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- H04L27/00—Modulated-carrier systems
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
- H04L27/3836—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using the received modulated signal or the received IF signal, e.g. by detecting a pilot or by frequency multiplication
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Abstract
The invention discloses a demodulation method of transient modulation parameters of intermittent radiation signals, which comprises the following steps: step one, carrying out microwave frequency mixing on the intermittent radiation signal to obtain an intermediate frequency signal, and carrying out microwave detection to obtain a time domain signal; step two, sampling the time domain signal in real time, and analyzing the pulse signal to obtain a pulse parameter; and step three, sampling the intermediate frequency signal in real time, performing time-sharing extraction on the intra-pulse signal obtained by sampling, and sequentially performing primary demodulation, secondary demodulation and matched filtering on the obtained time slot signal.
Description
Technical Field
The invention relates to the field of radio electronics, in particular to a demodulation method of transient modulation parameters of intermittent radiation signals.
Background
With the development of the missile seeker technology, the guided signal application of the missile gradually changes from continuous wave guidance to pulse intermittent radiation guidance, the electronic guided missile system is increasingly complex, and the attack target of the missile is also changed from a single target to a multi-target technology. Especially, under the background of a high-intensity interference airspace, the missile guidance weapon system is required to have the capacity of resisting interference, identifying targets, tracking multiple targets and guiding, so that the radar guidance signals adopt an intermittent radiation guidance mode and send the guidance signals carrying coded modulation information, and the tactical performances of the weapon system, such as resisting interference, attacking multiple targets and the like, are greatly improved. At the same time, however, the complexity of the guidance signal is also of a relatively high degree, in particular a complex, transient, complex modulation signal. Technical characteristics of modulation parameters of a guidance signal emitted by a radar and accuracy of the modulation parameters are always very concerned by designers, but the technical characteristics are not effectively solved on a calibration test means.
Disclosure of Invention
The invention solves the problem that the parameter modulation precision of the guidance signal emitted by the radar in the prior art is low; in order to solve the problem, the invention provides a demodulation method of transient modulation parameters of intermittent radiation signals.
The invention provides a demodulation method of transient modulation parameters of intermittent radiation signals, which comprises the following steps:
step one, carrying out microwave frequency mixing on the intermittent radiation signal to obtain an intermediate frequency signal, and carrying out microwave detection to obtain a time domain signal;
step two, sampling the time domain signal in real time, and analyzing the pulse signal to obtain a pulse parameter;
and step three, sampling the intermediate frequency signal in real time, performing time-sharing extraction on the intra-pulse signal obtained by sampling, and sequentially performing primary demodulation, secondary demodulation and matched filtering on the obtained time slot signal.
Furthermore, the time-sharing extraction of the intra-pulse signal obtained by sampling comprises dividing data of the intra-pulse signal at a time interval of 1 unit of waveform characteristics of the intra-pulse signal.
Further, the primary demodulation includes setting filtering of a corresponding bandwidth to obtain a mixed time domain modulation signal and a modulation index of the primary modulation.
Further, the mixed time domain modulation signal is demodulated to obtain the mixed time domain signal and a modulation index of the secondary modulation.
And further, setting two band-pass filters according to the frequency band intervals of the modulation frequencies of the mixed time domain modulation signal and the mixed time domain signal, and performing matched filtering on the mixed time domain signal to obtain two modulation frequencies carried in the mixed time domain signal.
The advantages of the invention include:
based on the basic characteristics of modulation parameters, the modulation information carried by the guidance signal is subjected to time-sharing extraction and step-by-step demodulation, so that the modulation characteristics of the intermittent radiation guidance signal are accurately calibrated and calibrated, and the problem of calibration of the modulation signal is solved.
Drawings
Fig. 1 is a schematic flowchart of a demodulation method of transient modulation parameters of an intermittent radiation signal according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of primary demodulation of the method for demodulating transient modulation parameters of intermittent radiation signals according to the embodiment of the present invention;
fig. 3 is a schematic flow chart of secondary demodulation of the demodulation method of the transient modulation parameter of the intermittent radiation signal according to the embodiment of the present invention;
fig. 4 is a schematic diagram of matched filtering of the demodulation method of transient modulation parameters of intermittent radiation signals according to the embodiment of the present invention.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
The invention provides a demodulation method of transient modulation parameters of intermittent radiation signals, which comprises the following steps:
step one, carrying out microwave frequency mixing on the intermittent radiation signal to obtain an intermediate frequency signal, and carrying out microwave detection to obtain a time domain signal;
step two, sampling the time domain signal in real time, and analyzing the pulse signal to obtain a pulse parameter;
and step three, sampling the intermediate frequency signal in real time, performing time-sharing extraction on the intra-pulse signal obtained by sampling, and sequentially performing primary demodulation, secondary demodulation and matched filtering on the obtained time slot signal.
Specifically, a high-speed acquisition module respectively performs time domain real-time sampling on an obtained time domain signal and an obtained intermediate frequency signal, wherein the time domain signal is used as synchronous trigger of intermediate frequency signal sampling; then, a group of signal data information obtained by sampling the time domain signal is demodulated to obtain the pulse signal, the pulse period, the pulse width, the rise time and other information can be obtained by adopting an analysis mode of pulse parameters during demodulation, and a group of signal data information obtained by sampling the intermediate frequency signal in real time is obtained; then, analyzing an intra-pulse modulation model of the intermittent radiation signal, and demodulating the extracted signal data of each time slot by using a software model; because the intra-pulse signal of the intermittent radiation signal is a complex multi-level composite modulation signal, the complex multi-level composite modulation signal needs to be demodulated step by step, after each level of demodulation analysis, the modulation frequency and the modulation index under the corresponding modulation mode can be obtained, and finally, the characteristic data of the transient modulation parameter of the whole intermittent radiation signal can be obtained through the multi-level demodulation processing, so that the demodulation analysis of the signal is realized. In the present embodiment, two-stage demodulation is taken as an example to schematically illustrate.
The time-sharing extraction of the intra-pulse signals comprises the following steps: after the intermediate frequency signal is sampled in real time, the displayed waveform information can be regarded as a time domain signal distributed according to time, and the acquired data volume can be regarded as data information distributed according to time; then, according to the principle of time distribution consistency, the acquired intermediate frequency signal data information is subjected to time slot division, the data of the intra-pulse signal is divided at the time interval of 1 unit of signal waveform characteristic, and a series of time slot signals can be obtained, wherein the time slot signals are the waveform characteristic information of time distribution.
The first-stage demodulation comprises the following steps: for the data information of the time slot signal, a software radio technology is used for demodulating the signal, and filtering with corresponding bandwidth is set in demodulation, so that a mixed time domain modulation signal is obtained. In the demodulation process, the modulation index (i.e. phase modulation index, etc.) of the first-level modulation can be obtained by using the demodulation theory. The secondary demodulation comprises the following steps: and demodulating and modulating the mixed time domain modulation signal obtained by primary demodulation by using the software radio technology again to obtain the mixed time domain signal. In the demodulation process, the modulation index (i.e. modulation amplitude, etc.) of the first-level modulation can be obtained by using the demodulation theory.
The matched filtering includes: the mixed time domain signal obtained by the secondary demodulation is a mixed signal of two modulation signals carrying different modulation frequencies. Therefore, according to the frequency band interval of the two modulation frequencies, the two band-pass filters are set by using the software radio technology, and the mixed time domain signal is subjected to matched filtering, so that the two modulation frequencies carried in the mixed time domain signal can be obtained through filtering.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (5)
1. A demodulation method of transient modulation parameters of intermittent radiation signals is characterized by comprising the following steps:
step one, carrying out microwave frequency mixing on the intermittent radiation signals to obtain intermediate frequency signals, and carrying out microwave detection on the intermittent radiation signals to obtain time domain signals;
step two, sampling the time domain signal in real time, and analyzing the pulse signal to obtain a pulse parameter;
and step three, sampling the intermediate frequency signal in real time, wherein the signal in each sending time slot is in transient change due to time domain change of the guidance signal in the pulse, so that time-sharing extraction of the signal is required to be performed on each sending time slot, signal data in each time slot is acquired, and primary demodulation, secondary demodulation and matched filtering are sequentially performed on the acquired time slot signal.
2. The demodulation method of claim 1 wherein the time-division extracting of the sampled intra-pulse signal comprises dividing data of the intra-pulse signal at a time interval of 1 unit of waveform characteristics of the intra-pulse signal.
3. The method of claim 1 wherein said primary demodulation comprises filtering to set the corresponding bandwidth to obtain a mixed time domain modulation signal and a modulation index of the primary modulation.
4. The intermittent radiation signal transient state modulation parametric demodulation method of claim 3, characterized in that the mixed time domain modulation signal is demodulated to obtain a modulation index of the mixed time domain signal and the secondary modulation.
5. The intermittent radiation signal transient modulation parametric demodulation method of claim 4, characterized in that two band pass filters are set according to the frequency band interval of the first-stage demodulation and the second-stage demodulation or the modulation frequency of the signal, and the mixed time domain signal is matched and filtered to obtain two modulation frequencies carried in the mixed time domain signal.
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Inventor after: Guo Xiaoran Inventor after: Hua Xiang Inventor after: Chen Bin Inventor after: Xie Henggui Inventor after: Xu Haiyan Inventor after: Chen Guangyao Inventor before: Hua Xiang Inventor before: Chen Bin Inventor before: Xie Henggui Inventor before: Xu Haiyan Inventor before: Chen Guangyao |
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