CN106501782A - A kind of multichannel satellite navigation and interference signal simulation source and signal imitation method - Google Patents
A kind of multichannel satellite navigation and interference signal simulation source and signal imitation method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The present invention relates to a kind of multichannel satellite navigation and interference signal simulation source and signal imitation method, belong to satellite navigation signals simulation and technical field of measurement and test.The simulation source includes that signal plays hardware and navigation and the imitative software of interference signal number；The signal is played hardware and is made up of general high-performance calculation machine platform, intermediate frequency random waveform generation card and up-conversion card；The navigation and the imitative software of interference signal number are made up of the imitative software of the base band number that navigates, the imitative software of interference base band number, baseband signal synthesis and Digital Up Convert.A kind of multichannel satellite navigation of the present invention and interference signal simulation source and signal imitation method, high-performance calculation platform is relied on to generate navigation and interference data, hardware is played using signal and plays navigation and the customizable multichannel navigation of interference data genaration characteristic and interference radiofrequency signal, there is low cost, use flexible advantage, in the Life cycle such as research and development, test and maintenance that can be used for multichannel navigation antijam receiver as test equipment.
Description
Technical Field
The invention relates to a multichannel satellite navigation and interference signal simulation source and a signal simulation method, and belongs to the technical field of satellite navigation signal simulation and test.
Background
In the application of the satellite navigation anti-interference technology, the multi-channel airspace self-adaptive anti-interference technology can effectively inhibit interference signals and extract weak satellite navigation signals, and is one of effective methods for improving the anti-interference performance of a satellite navigation receiver. The multi-channel satellite navigation and interference signal simulation source can provide an approximately real satellite navigation and interference signal test environment for the multi-channel navigation anti-interference receiver, and is indispensable instrument and equipment for research, development, test and maintenance of the multi-channel anti-interference receiver. Compared with the actual external field test, the multichannel satellite navigation and interference signal simulation source can play the following roles: the wave shape and the incoming wave direction of a plurality of satellite navigation signals are simulated, so that multipath and test environment interference can be effectively avoided; simulating a plurality of interference waveforms and incoming wave directions to reproduce the characteristics of the multichannel receiving signals; simulating navigation and interference signals with the characteristics, and flexibly setting various error parameters, interference forms and interference-signal ratios; navigation and interference signals under the high dynamic condition are simulated, and the test evaluation cost is effectively reduced.
The existing satellite navigation and interference signal simulation source mostly adopts a signal generation mode combining software and hardware, modeling simulation is carried out on a satellite orbit, the movement of a receiver, various error sources, an interference source and the like by digital simulation software, adjustment parameters of the signal are generated according to simulation results, baseband navigation and interference signals are generated in real time by hardware (mostly adopting a programmable logic gate array FPGA or a digital signal processing DSP) according to the parameters, finally, the digital signals are converted into analog signals through analog-to-digital conversion (D/A), and the final navigation and interference radio frequency signals are obtained after up-conversion by a microwave module. The system structure has the advantages that real radio frequency satellite signals can be generated in real time for a long time, and the defects that the whole system structure is very complex due to software and hardware interaction, channels are not easy to expand or new functions are not easy to add, the flexibility is poor, the cost is high, and the application and popularization are limited. Moreover, no mature analog source product with multi-channel satellite navigation and interference signal simulation exists at present, and the low-cost and high-efficiency test of the multi-channel navigation anti-interference receiver is restricted.
Disclosure of Invention
The invention aims to provide a multichannel satellite navigation and interference signal simulation source and a signal simulation method, which can flexibly realize multichannel satellite navigation and interference signal simulation at low cost and can meet the indoor low-cost and high-efficiency test of a multichannel navigation anti-interference receiver.
In order to solve the technical problems, the invention provides a multi-channel satellite navigation and interference signal simulation source, which simulates radio frequency signals at an anti-interference antenna of a multi-channel navigation anti-interference receiver, wherein the radio frequency signals are synthesized by N satellite navigation signals and M interference source signals, N is more than or equal to 1, M is more than or equal to 1, and the simulation source comprises signal playing hardware and navigation and interference signal number simulation software;
the signal playing hardware consists of a general high-performance computer platform, an intermediate-frequency arbitrary waveform generating card and an up-conversion card; the intermediate-frequency arbitrary waveform generating card and the up-conversion card are arranged on two paths of high-speed PCIe buses of the general high-performance computer platform, and the PCIe buses provide required installation fixed positions, high-speed data transmission paths and power supplies; the intermediate frequency arbitrary waveform generating card adopts a piece of multi-channel PCIe digital-analog conversion card, particularly, the number of the channels is 4, and the card is used for playing a large data volume intermediate frequency data file stored on a hard disk of a general high-performance computer platform and converting an intermediate frequency digital signal stored in the intermediate frequency data file into an intermediate frequency analog signal; the up-conversion card generates a multi-channel intermediate frequency simulator signal generated by the card according to an intermediate frequency arbitrary waveform, particularly, the number of channels is 4, the up-conversion card up-converts the multi-channel intermediate frequency simulator signal into a satellite navigation radio frequency simulation signal, and feeds a plurality of channels of radio frequency simulation signals to the multi-channel navigation anti-interference receiver through a cable, so that the multi-channel navigation anti-interference receiver is used for indoor low-cost and high-efficiency test of the multi-channel navigation. The radio frequency analog signal comprises N channel satellite navigation signals and M channel interference signals received by the multi-channel navigation anti-interference receiver.
The navigation and interference signal number simulation software consists of navigation baseband number simulation software, interference baseband number simulation software, baseband signal synthesis and digital up-conversion; the navigation baseband digital simulation software simulates and generates navigation baseband data with a certain time (such as 1 hour) according to the position of a visible navigation satellite, the dynamic track of a receiving antenna of the multi-channel navigation anti-interference receiver, navigation messages, signal state parameters, error model parameters in the navigation signal generation, transmission and receiving processes and the like; simulating by interference baseband digital simulation software to generate interference baseband data of a certain time (such as 1 hour) according to the interference type, the interference parameters and the like; and the baseband signal synthesis and digital up-conversion superposes the navigation baseband data and the interference baseband data according to the set interference-signal ratio to generate superposed baseband data, the superposed baseband data is subjected to digital up-conversion to obtain an intermediate frequency data file, and the central frequency of the intermediate frequency data file is consistent with the central frequency of the intermediate frequency analog signal to be played by the signal playing hardware.
The invention also provides a signal simulation method of the multichannel satellite navigation and interference signal simulation source, which comprises the following steps:
firstly, preparing a multichannel satellite navigation and interference signal intermediate frequency data file:
according to the following stepsRespectively generating navigation baseband data and interference baseband data, taking a GPS navigation satellite as an example, and making the position vector of the ith navigation satellite as1,2, …, N, and the position of the antenna of the channel 1 of the multichannel navigation anti-interference receiver is as followsThe speed of light is c, and the navigation signal propagation delay is calculated as follows:
wherein,which is indicative of the satellite clock error,represents the ionospheric propagation delay,Propagation delay of troposphere,Which is indicative of the satellite ephemeris error,representing the added delay of the multipath signal.
Calculating satellite signal Doppler frequency received by multi-channel navigation anti-interference receiver
Wherein f isL1The GPS L1 carrier frequency is 1575.42MHz, representing the derivation operation.
Calculating the navigation baseband signal of the multi-channel navigation anti-interference receiver channel 1 as follows:
wherein,indicating a carrier phase error. Visible navigation baseband signal is received satellite signal amplitude Ai(t) satellite transmitting C/A codeSatellite signal modulated navigation informationAnd Doppler phaseThe product of the four terms.
Taking the modulation interference noise as an example, let the j-th interference source position vector beThe propagation delay of the interference signal isCalculating the Doppler frequency of interference signals received by a multi-channel navigation anti-interference receiver
Calculating an interference baseband signal generated by an interference source at a channel 1 of the multi-channel navigation anti-interference receiver according to the formula (5) as follows:
wherein, B1j(t) represents interference signal pulse modulation,Denotes the baseband symbol, F {. is } denotes the baseband symbol modulation mapping,The phase of the doppler is represented by,indicating a phase error.
The method comprises the following steps of superposing N navigation baseband signals and M interference baseband signals to obtain superposed baseband data, and obtaining intermediate frequency signals of a channel 1 of the multi-channel navigation anti-interference receiver after the signals are subjected to digital up-conversion:
wherein f isIFThe intermediate frequency of the signal playing hardware is generally 10 MHz-70 MHz, and the interference-signal ratio of the synthesized signal isASRepresenting the power of the navigation signal, AJIs indicative of the power of the interfering signal,indicating the navigation signal of the ith path,representing the jth interference signal.
And respectively generating intermediate frequency signals of other channels of the multi-channel navigation anti-interference receiver according to the steps, quantizing the intermediate frequency signals, and storing the intermediate frequency signals as binary intermediate frequency data files according to a required format.
Secondly, playing the intermediate frequency data file to generate an intermediate frequency analog signal:
the binary intermediate frequency data file generated in the first step is stored on a hard disk of a general high-performance computer platform, is similar to a music file, an intermediate frequency arbitrary waveform generating card is similar to a music playing device, and signal playing control software is installed on the general high-performance computer platform and is similar to music playing software. When the multi-channel satellite navigation and interference signal simulation source works, the signal playing control software loads different intermediate frequency data files, so that satellite navigation and interference intermediate frequency signals under different parameter settings can be played in real time. During playing, parameters such as playing time length, cyclic playing, filtering, multichannel amplitude and phase correction coefficients, output signal power and the like can be adjusted, and the generated intermediate frequency analog signal is output through an intermediate frequency cable.
Thirdly, up-converting the intermediate frequency analog signal to a radio frequency analog signal, and feeding the radio frequency analog signal into the equipment to be tested:
the intermediate-frequency analog signal generated in the second step is up-converted to a radio-frequency analog signal by using an up-conversion card, the intermediate-frequency analog signal is attenuated to a proper power by an attenuator and then replaces a multi-channel anti-interference antenna, the intermediate-frequency analog signal is directly fed into the radio-frequency signal input end of the multi-channel navigation anti-interference receiver through a radio-frequency cable, the radio-frequency signal is consistent with the radio-frequency signal received by the multi-channel anti-interference antenna and comprises N satellite navigation receiving signals and M interference source receiving signals, the synthetic signal can reflect the high dynamic characteristics of the receiver and the anti-interference characteristics under various extreme error conditions through simulation, and the flexibility.
The invention has the following beneficial effects:
the invention relates to a multi-channel satellite navigation and interference signal simulation source and a signal simulation method, which rely on a high-performance computing platform to generate navigation and interference data, utilize signal playing hardware to play navigation and interference data to generate multi-channel navigation and interference radio frequency signals with customizable characteristics, have the advantages of low cost and flexible use, and can be used in the whole life cycle of research, development, test, maintenance and the like of a multi-channel navigation anti-interference receiver as test equipment.
Drawings
FIG. 1 is a schematic diagram of a signal to be simulated from a multi-channel satellite navigation and jamming signal simulation source according to the present invention;
FIG. 2 is a schematic diagram of the software and hardware components of the multichannel satellite navigation and jamming signal simulation source of the present invention;
FIG. 3 is a flow chart of an embodiment of the method for simulating a source signal of a multichannel satellite navigation and interference signal simulation source according to the invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a signal to be simulated of a multichannel satellite navigation and jamming signal simulation source according to the present invention. The simulation object is a radio frequency signal at an anti-interference antenna of the multi-channel navigation anti-interference receiver, and is the synthesis of N satellite navigation signals and M interference source signals, and the synthesis signal can reflect the anti-interference characteristics of the receiver under the conditions of high dynamic characteristics and various extreme errors through simulation.
FIG. 2 is a schematic diagram of the software and hardware components of the multichannel satellite navigation and interference signal simulation source. The multichannel satellite navigation and interference signal simulation source simulates radio frequency signals at an anti-interference antenna of the multichannel navigation anti-interference receiver, N satellite navigation signals and M interference source signals are synthesized, and the signals are fed into the multichannel navigation anti-interference receiver through a radio frequency cable for testing. The multi-channel satellite navigation and interference signal simulation source consists of navigation and interference signal number simulation software and signal playing hardware, wherein the navigation and interference signal number simulation software consists of navigation baseband number simulation software, interference baseband number simulation software, baseband signal synthesis and digital up-conversion, and the signal playing hardware consists of a general high-performance computer platform, an intermediate-frequency arbitrary waveform generating card and an up-conversion card.
FIG. 3 is a flow chart of an embodiment of the method for simulating a source signal of a multichannel satellite navigation and interference signal simulation source according to the invention. The method comprises the following steps: the method comprises the steps that firstly, a multi-channel satellite navigation and interference signal intermediate frequency data file is prepared, wherein the multi-channel satellite navigation and interference signal intermediate frequency data file can be derived from navigation and interference signal number simulation software, reflects the characteristics of a satellite navigation signal space section, an environment section and a user section and the interference characteristics, and can also be derived from navigation and interference signals which are actually acquired, and the complex test environment of an external field is reproduced; playing the intermediate frequency data file to generate an intermediate frequency analog signal, playing the intermediate frequency data file in a mode similar to music playing software, and generating the intermediate frequency analog signal; and thirdly, up-converting the intermediate-frequency analog signal to a radio-frequency analog signal, feeding the radio-frequency analog signal into the equipment to be tested, up-converting the intermediate-frequency analog signal to the radio-frequency analog signal by using an up-conversion card, attenuating the radio-frequency analog signal to proper power, and directly feeding the radio-frequency analog signal to the radio-frequency signal input end of the multi-channel navigation anti-interference receiver through a radio-frequency cable instead of a multi-.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (5)
1. A kind of multi-channel satellite navigation and interference signal simulation source, the radio frequency signal of the anti-interference antenna of the analog multi-channel navigation anti-interference receiver, it is the synthesis of N satellite navigation signals and M interference source signals, N is greater than or equal to 1, M is greater than or equal to 1, characterized by that: the analog source comprises signal playing hardware and navigation and interference signal number simulation software;
the signal playing hardware consists of a general high-performance computer platform, an intermediate-frequency arbitrary waveform generating card and an up-conversion card; the intermediate-frequency arbitrary waveform generating card and the up-conversion card are arranged on two paths of high-speed PCIe buses of the general high-performance computer platform, and the PCIe buses provide required installation fixing positions, high-speed data transmission paths and power supplies; the intermediate-frequency arbitrary waveform generating card adopts a multi-channel PCIe digital-to-analog conversion card and is used for playing a large data volume intermediate-frequency data file stored on a hard disk of a general high-performance computer platform and converting intermediate-frequency digital signals stored in the intermediate-frequency data file into intermediate-frequency analog signals; the up-conversion card generates a multi-channel intermediate frequency simulator signal generated by the card according to an intermediate frequency arbitrary waveform, up-converts the multi-channel intermediate frequency simulator signal into a satellite navigation radio frequency simulation signal, feeds the multi-channel radio frequency simulation signal to the multi-channel navigation anti-interference receiver through a cable, and is used for indoor low-cost and high-efficiency test of the multi-channel navigation anti-interference receiver; the radio frequency analog signal comprises N channel satellite navigation signals and M channel interference signals received by the multi-channel navigation anti-interference receiver;
the navigation and interference signal number simulation software consists of navigation baseband number simulation software, interference baseband number simulation software, baseband signal synthesis and digital up-conversion; the navigation baseband digital simulation software simulates and generates navigation baseband data with a certain time length according to the position of a visible navigation satellite, the dynamic track of a receiving antenna of the multi-channel navigation anti-interference receiver, navigation messages and signal state parameters, and error model parameters in the navigation signal generation, transmission and receiving processes; the interference baseband digital simulation software simulates and generates interference baseband data with a certain time length according to the interference type and the interference parameters; and the baseband signal synthesis and digital up-conversion superposes the navigation baseband data and the interference baseband data according to the set interference-signal ratio to generate superposed baseband data, the superposed baseband data is subjected to digital up-conversion to obtain an intermediate frequency data file, and the central frequency of the intermediate frequency data file is consistent with the central frequency of the intermediate frequency analog signal to be played by the signal playing hardware.
2. A multichannel satellite navigation and jamming signal simulation source according to claim 1, characterized by: the number of the channels of the multi-channel PCIe digital-to-analog conversion card is 4.
3. A multichannel satellite navigation and jamming signal simulation source according to claim 1, characterized by: the number of channels of the multi-channel intermediate frequency simulator signal generated by the intermediate frequency arbitrary waveform generating card is 4.
4. A method of signal simulation using the multichannel satellite navigation and jamming signal simulation source of claim 1, characterized in that the method comprises the steps of:
firstly, preparing a multichannel satellite navigation and interference signal intermediate frequency data file:
respectively generating navigation baseband data and interference baseband data according to the following steps, taking a GPS navigation satellite as an example, and enabling the position vector of the ith navigation satellite to be1,2, …, N, and the position of the antenna of the channel 1 of the multichannel navigation anti-interference receiver is as followsThe speed of light is c, and the navigation signal propagation delay is calculated as follows:
wherein,which is indicative of the satellite clock error,represents the ionospheric propagation delay,Propagation delay of troposphere,Which is indicative of the satellite ephemeris error,represents an additive delay of the multipath signal;
calculating satellite signal Doppler frequency received by multi-channel navigation anti-interference receiver
Wherein f isL1Represents the GPS L1 carrier frequency,. represents the derivation operation;
calculating the navigation baseband signal of the multi-channel navigation anti-interference receiver channel 1 as follows:
wherein,representing a carrier phase error;
taking the modulation interference noise as an example, let the j-th interference source position vector beThe propagation delay of the interference signal isCalculating the Doppler frequency of interference signals received by a multi-channel navigation anti-interference receiver
Calculating an interference baseband signal generated by an interference source at a channel 1 of the multi-channel navigation anti-interference receiver according to the formula (5) as follows:
wherein, B1j(t) represents interference signal pulse modulation,Denotes the baseband symbol, F {. is } denotes the baseband symbol modulation mapping,The phase of the doppler is represented by,indicating a phase error;
the method comprises the following steps of superposing N navigation baseband signals and M interference baseband signals to obtain superposed baseband data, and obtaining intermediate frequency signals of a channel 1 of the multi-channel navigation anti-interference receiver after the signals are subjected to digital up-conversion:
wherein f isIFThe intermediate frequency of the signal playing hardware is generally 10 MHz-70 MHz, and the interference-signal ratio of the synthesized signal isASRepresenting the power of the navigation signal, AJIs indicative of the power of the interfering signal,indicating the navigation signal of the ith path,representing a j path interference signal;
respectively generating intermediate frequency signals of other channels of the multi-channel navigation anti-interference receiver according to the steps, quantizing the intermediate frequency signals, and storing the intermediate frequency signals as binary intermediate frequency data files according to a required format;
secondly, playing the intermediate frequency data file to generate an intermediate frequency analog signal:
the binary intermediate frequency data file generated in the first step is stored on a hard disk of a general high-performance computer platform, the file is similar to a music file, an intermediate frequency arbitrary waveform generating card is similar to a music playing device, and signal playing control software is installed on the general high-performance computer platform and is similar to music playing software; when the multi-channel satellite navigation and interference signal simulation source works, the signal playing control software loads different intermediate frequency data files, so that satellite navigation and interference intermediate frequency signals under different parameter settings can be played in real time, and the generated intermediate frequency simulation signals are output through an intermediate frequency cable;
thirdly, up-converting the intermediate frequency analog signal to a radio frequency analog signal, and feeding the radio frequency analog signal into the equipment to be tested:
the intermediate-frequency analog signal generated in the second step is up-converted to a radio-frequency analog signal by using an up-conversion card, the intermediate-frequency analog signal is attenuated to a proper power by an attenuator and then replaces a multi-channel anti-interference antenna, the intermediate-frequency analog signal is directly fed into the radio-frequency signal input end of the multi-channel navigation anti-interference receiver through a radio-frequency cable, the radio-frequency signal is consistent with the radio-frequency signal received by the multi-channel anti-interference antenna and comprises N satellite navigation receiving signals and M interference source receiving signals, the synthetic signal can reflect the high dynamic characteristics of the receiver and the anti-interference characteristics under various extreme error conditions through simulation, and the flexibility.
5. A method of signal simulation using the multichannel satellite navigation and jamming signal simulation source of claim 4, characterized by: the GPS L1 carrier frequency fL1Is 1575.42 MHz.
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| CN107124237A (en) * | 2017-04-26 | 2017-09-01 | 天津理工大学 | Ais signal and the device of interference signal are produced simultaneously using AWG |
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