System and method for simultaneously simulating signals of multiple radars

Abstract

The invention belongs to the technical field of radar signal simulation and digital signal processing, and particularly discloses a system and method for simultaneously simulating signals of multiple radars, and the method comprises the steps: employing a delay resolving module, an amplitude resolving module and a frequency resolving module to respectively obtain the delay, amplitude and frequency control quantity of each radar simulation signal, the method comprises the following steps: according to the acquired control quantity and the power and frequency control quantity of an up-conversion module, simulating each radar signal analog digital quantity through a plurality of radar signal analog modules according to the acquired control quantity, and converting the radar analog digital quantity into an intermediate-frequency analog signal through synthesis and digital-to-analog conversion; and the up-conversion module converts the frequency of the intermediate-frequency analog signals simulated by the plurality of radar signals generated by the digital-to-analog converter to a corresponding frequency band according to the control of the amplitude resolving module and the frequency resolving module, so as to obtain the final analog signals of the plurality of radar signals.

Description

Technical Field

[0001] The present invention belongs to the technical field of radar signal simulation and digital signal processing, and in particular relates to a system and method for simultaneously simulating multiple radar signals. Background Art

[0002] Radar signal simulation is a necessary condition for passive radar and seeker performance testing, and is widely used in passive radar research and development, as well as performance testing of radar equipment.

[0003] The realization of radar signal simulation mainly includes three aspects: pulse modulation, frequency modulation and amplitude modulation. For radar signals of conventional pulse system, it can be realized through conventional signal sources; for radar signal simulation of complex systems such as linear frequency modulation, repetition frequency difference, and frequency agility, customized radar signal simulators are usually required for implementation.

[0004] In an actual battlefield environment, there are usually multiple radar devices on both sides, including radar signals of different frequency bands, different signal styles, and different platforms. Therefore, in order to truly reflect the complex electromagnetic environment of the battlefield, it is necessary to simulate multiple radar signals at the same time. Conventional signal sources and radar signal simulators in the prior art can usually only simulate a single radar signal, which is difficult to meet the equipment's needs for complex electromagnetic environment simulation. Therefore, it is urgent to propose a method for simulating multiple radar signals simultaneously to solve the above technical problems. Summary of the invention

[0005] The present invention provides a system and method for simulating multiple radar signals simultaneously, so as to solve the problem that conventional signal sources and radar signal simulators in the prior art can usually only simulate a single radar signal and cannot meet the needs of equipment for simulating complex electromagnetic environments.

[0006] In a first aspect, a system for simultaneously simulating multiple radar signals is provided, the system comprising:

[0007] A delay calculation module, an amplitude calculation module, a frequency calculation module, a radar signal simulation module, a signal synthesis module, a digital-to-analog converter and an up-conversion module; wherein the number of the radar signal simulation modules is several, which is consistent with the number of radar signals to be simulated;

[0008] The delay calculation module is used to receive the distance between each radar and the receiving point in the multiple radar scene input information, and obtain the control value of the delay amount simulated by each radar signal according to the distance;

[0009] The amplitude calculation module is used to receive the distance between each radar and the receiving point and the power emitted by each radar in the multiple radar scene input information, and then obtain the amplitude control amount of each radar signal simulation and the power control amount of the up-conversion module;

[0010] The frequency calculation module is used to receive frequency information in multiple radar scene input information, and then obtain the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module;

[0011] Several radar signal simulation modules are used to receive the delay, amplitude and frequency control quantity of each radar signal simulation, realize single-channel radar signal simulation by digital direct frequency DDS, and obtain several radar signal simulation digital quantities;

[0012] The signal synthesis module is used to directly add the obtained digital quantities of the simulated radar signals to obtain the digital quantities simulated by multiple radar signals;

[0013] The digital-to-analog converter is used to perform digital-to-analog conversion on the digital quantities of the multiple radar signal simulations to obtain intermediate frequency analog signals of the multiple radar signal simulations;

[0014] The up-conversion module is used to convert the intermediate frequency analog signal of multiple radar signal simulation generated by the digital-to-analog converter to the corresponding frequency band according to the control of the amplitude resolution module and the frequency resolution module, so as to obtain the final multiple radar signal simulation signal.

[0015] In a second aspect, a method for simultaneously simulating multiple radar signals is provided, the method comprising:

[0016] The delay calculation module receives the distance between each radar and the receiving point in the multiple radar scene input information, and obtains the control value of the delay amount simulated by each radar signal according to the distance;

[0017] The amplitude calculation module receives the distance between each radar and the receiving point and the power emitted by each radar in the input information of multiple radar scenes, and then obtains the amplitude control amount of each radar signal simulation and the power control amount of the up-conversion module;

[0018] The frequency resolution module receives frequency information from multiple radar scene input information, and then obtains the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module;

[0019] Several radar signal simulation modules receive the delay, amplitude and frequency control quantity of each radar signal simulation, realize single-channel radar signal simulation by digital direct frequency DDS, and obtain several radar signal simulation digital quantities;

[0020] The signal synthesis module directly adds the obtained analog digital quantities of several radar signals to obtain the analog digital quantities of multiple radar signals;

[0021] The digital-to-analog converter performs digital-to-analog conversion on the digital quantities of the multiple radar signal simulations to obtain intermediate frequency analog signals of the multiple radar signal simulations;

[0022] The up-conversion module converts the intermediate frequency analog signal generated by the digital-to-analog converter to the corresponding frequency band according to the control of the amplitude resolution module and the frequency resolution module, and obtains the final multiple radar signal simulation signal.

[0023] The embodiment of the present invention provides a system and method for simulating multiple radar signals simultaneously. The system and method use software radio to realize the simultaneous simulation of multiple radar signals based on a hardware architecture consisting of a baseband module composed of a field programmable gate array FPGA and a digital-to-analog converter DAC and an up-conversion module. The system and method can realize the simultaneous simulation of multiple radar signals. The system can realize the simultaneous simulation of 16 radar signals with an instantaneous bandwidth of 1 GHz. The system can not only simulate radar signals of different styles at the same time, but also simulate the differences in power, delay and other latitudes between different radar signals.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A schematic diagram of the structure of a system for simultaneously simulating multiple radar signals provided according to an embodiment of the present invention;

[0027] Figure 2 The present invention is a schematic diagram of an implementation flow of a method for simultaneously simulating multiple radar signals provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of this specification more clear, the technical solutions of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0030] The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.

[0031] In order to realize the simultaneous simulation of signals for testing multiple radars, an embodiment of the present invention provides a system and method for simultaneously simulating signals of multiple radars.

[0032] Figure 1 FIG. 1 is a schematic diagram of a system structure for simulating multiple radar signals simultaneously according to an embodiment of the present invention. Figure 1 , the system comprising:

[0033] A delay calculation module, an amplitude calculation module, a frequency calculation module, a radar signal simulation module, a signal synthesis module, a digital-to-analog converter and an up-conversion module; wherein the number of the radar signal simulation modules is several, which is consistent with the number of radar signals to be simulated;

[0034] The delay calculation module is used to receive the distance between each radar and the receiving point in the multiple radar scene input information, and obtain the control value of the delay amount simulated by each radar signal according to the distance;

[0035] The amplitude calculation module is used to receive the distance between each radar and the receiving point and the power emitted by each radar in the multiple radar scene input information, and then obtain the amplitude control amount of each radar signal simulation and the power control amount of the up-conversion module;

[0036] The frequency calculation module is used to receive frequency information in multiple radar scene input information, and then obtain the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module;

[0037] Several radar signal simulation modules are used to receive the delay, amplitude and frequency control quantity of each radar signal simulation, realize single-channel radar signal simulation by digital direct frequency DDS, and obtain several radar signal simulation digital quantities;

[0038] The signal synthesis module is used to directly add the obtained digital quantities of the simulated radar signals to obtain the digital quantities simulated by multiple radar signals;

[0039] The digital-to-analog converter is used to perform digital-to-analog conversion on the digital quantities of the multiple radar signal simulations to obtain intermediate frequency analog signals of the multiple radar signal simulations;

[0040] The up-conversion module is used to convert the intermediate frequency analog signal of multiple radar signal simulation generated by the digital-to-analog converter to the corresponding frequency band according to the control of the amplitude resolution module and the frequency resolution module, so as to obtain the final multiple radar signal simulation signal.

[0041] In a specific embodiment,

[0042] The multiple radar scene input information includes: signal patterns, transmission powers, transmission frequencies, and distances between radars and receiving points of the multiple radars to be simulated.

[0043] In a specific implementation, the delay calculation module is specifically used to:

[0044] According to the distance between each radar and the receiving point, the control value t of the delay amount simulated by each radar signal is obtained according to the following formula: i :

[0045]

[0046] In the formula, the control value of the delay is the time required for each radar to transmit the signal to the receiving point; d i is the distance between the radar and the receiving point; c is the speed of light; i=1,2,...,n, where n is the number of radar signal simulation modules, which is also the number of radar signals to be simulated.

[0047] In a specific implementation, the amplitude calculation module is specifically used to:

[0048] The actual received arrival power P at the receiving point is calculated based on the distance between each radar and the receiving point in the multi-radar scene input information and the power transmitted by each radar. i0 ;

[0049] The obtained arrival power P i0 Sort and select the largest arrival power P max , with the power P max The amplitude control is 2 N -1 is used as the basis to calculate the initial amplitude control value A of each radar i0 ;

[0050] The amplitude control values ​​of all radar signals are added together according to the following formula to obtain the amplitude control value sum SUM:

[0051] SUM=A 10 +A 20 +...+A i0 +...+A n0 ;

[0052] According to the initial amplitude control value A i0 And the sum of the amplitude control amount SUM, the final amplitude control amount of each radar is Where N is the bit width of the digital-to-analog converter;

[0053] According to the maximum arrival power P max The output power control amount of the up-conversion module is obtained by summing up the amplitude control amount SUM.

[0054] In a specific embodiment, it is specifically used for:

[0055] According to the frequency information P in the multiple radar scene input information i , get the minimum frequency P of all radar signal frequencies min and the maximum frequency P max ,Pick is the frequency control value of the up-conversion module, take is the control value of the baseband frequency of each radar signal, where f s is the sampling rate of the digital-to-analog converter.

[0056] The present invention provides a system for simulating multiple radar signals simultaneously, which can not only simulate the signal characteristics of multiple radar signals simultaneously, but also simulate the relationship between multiple radars in terms of power, distance and other latitudes in a battlefield environment, and finally realize the simultaneous simulation of multiple radar signals. In the project based on this method, only a single-chip FPGA logic resource is used to realize the simultaneous simulation of up to 64 radar signals under 1 GHz instantaneous bandwidth.

[0057] Based on the same inventive concept, the present invention also provides a method for simulating multiple radar signals simultaneously, see Figure 2 , the method comprising:

[0058] S200: The delay calculation module receives the distance between each radar and the receiving point in the multiple radar scene input information, and obtains the control value of the delay amount simulated by each radar signal according to the distance;

[0059] S202: The amplitude calculation module receives the distance between each radar and the receiving point and the power transmitted by each radar in the input information of the multiple radar scenes, and then obtains the amplitude control amount simulated by each radar signal and the power control amount of the up-conversion module;

[0060] S204: The frequency calculation module receives frequency information in the input information of multiple radar scenes, and then obtains the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module;

[0061] S206: a plurality of radar signal simulation modules receive the delay, amplitude and frequency control value of each radar signal simulation, and implement single-channel radar signal simulation by means of digital direct frequency distribution (DDS), thereby obtaining a plurality of radar signal simulation digital values;

[0062] S208: The signal synthesis module directly adds the multiple radar signal analog digital quantities generated by the FPGA to obtain digital quantities simulated by multiple radar signals;

[0063] S210: The digital-to-analog converter performs digital-to-analog conversion on the generated digital quantities of the multiple radar signal simulations to obtain intermediate frequency analog signals of the multiple radar signal simulations;

[0064] S212: The up-conversion module converts the intermediate frequency analog signal of the multiple radar signal simulation generated by the digital-to-analog converter to a corresponding frequency band according to the control of the amplitude resolution module and the frequency resolution module, so as to obtain the final multiple radar signal simulation signal.

[0065] In a specific embodiment,

[0066] The multiple radar scene input information includes: signal patterns, transmission powers, transmission frequencies, and distances between radars and receiving points of the multiple radars to be simulated.

[0067] In a specific implementation, the delay calculation module receives the distance between each radar and the receiving point in the multiple radar scene input information, and obtains the control value of the delay amount simulated by each radar signal according to the distance, specifically including:

[0068] According to the distance between each radar and the receiving point, the control value t of the delay amount simulated by each radar signal is obtained according to the following formula: i :

[0069]

[0070] In the formula, the control value of the delay is the time required for each radar to transmit the signal to the receiving point; d i is the distance between the radar and the receiving point; c is the speed of light; i=1,2,...,n, where n is the number of radar signal simulation modules, which is also the number of radar signals to be simulated.

[0071] In a specific implementation, the amplitude calculation module receives the distance between each radar and the receiving point and the power emitted by each radar in the multiple radar scene input information, and then obtains the amplitude control amount simulated by each radar signal and the power control amount of the up-conversion module, specifically including:

[0072] The actual received arrival power P at the receiving point is calculated based on the distance between each radar and the receiving point in the multi-radar scene input information and the power transmitted by each radar. i0 ;

[0073] The obtained arrival power P i0 Sort and select the largest arrival power P max , with the power P max The amplitude control is 2 N -1 is used as the basis to calculate the initial amplitude control value A of each radar i0 ;

[0074] The amplitude control values ​​of all radar signals are added together according to the following formula to obtain the amplitude control value sum SUM:

[0075] SUM=A 10 +A 20 +...+A i0 +...+A n0 ;

[0076] According to the initial amplitude control value A i0 And the sum of the amplitude control amount SUM, the final amplitude control amount of each radar is Where N is the bit width of the digital-to-analog converter;

[0077] According to the maximum arrival power P max The output power control amount of the up-conversion module is obtained by summing up the amplitude control amount SUM.

[0078] In a specific implementation, the frequency solving module receives frequency information in multiple radar scene input information, and then obtains the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module, specifically including:

[0079] According to the frequency information P in the multiple radar scene input information i , get the minimum frequency P of all radar signal frequencies min and the maximum frequency P max ,Pick is the frequency control value of the up-conversion module, take is the control value of the baseband frequency of each radar signal, where f s is the sampling rate of the digital-to-analog converter.

[0080] A method for simultaneously simulating multiple radar signals provided in an embodiment of the present invention uses software radio in a manner based on a baseband module composed of a field programmable gate array FPGA and a digital-to-analog converter DAC and a hardware architecture composed of an up-conversion module to achieve simultaneous simulation of multiple radar signals. It can achieve simultaneous simulation of 16 radar signals with an instantaneous bandwidth of 1 GHz, and can not only simulate radar signals of different styles at the same time, but also simulate differences in latitude such as power and delay between different radar signals.

[0081] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0082] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A system for simulating multiple radar signals simultaneously, characterized in that: The system comprises: A delay calculation module, an amplitude calculation module, a frequency calculation module, a radar signal simulation module, a signal synthesis module, a digital-to-analog converter and an up-conversion module; wherein the number of the radar signal simulation modules is several, which is consistent with the number of radar signals to be simulated; The delay calculation module is used to receive the distance between each radar and the receiving point in the multiple radar scene input information, and obtain the control value of the delay amount simulated by each radar signal according to the distance; The amplitude calculation module is used to receive the distance between each radar and the receiving point and the power emitted by each radar in the multiple radar scene input information, and then obtain the amplitude control amount of each radar signal simulation and the power control amount of the up-conversion module; The frequency calculation module is used to receive frequency information in multiple radar scene input information, and then obtain the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module; Several radar signal simulation modules are used to receive the delay, amplitude and frequency control quantity of each radar signal simulation, realize single-channel radar signal simulation by digital direct frequency DDS, and obtain several radar signal simulation digital quantities; The signal synthesis module is used to directly add the obtained digital quantities of the simulated radar signals to obtain the digital quantities simulated by multiple radar signals; The digital-to-analog converter is used to perform digital-to-analog conversion on the digital quantities of the multiple radar signal simulations to obtain intermediate frequency analog signals of the multiple radar signal simulations; The up-conversion module is used to convert the intermediate frequency analog signal of multiple radar signal simulation generated by the digital-to-analog converter to the corresponding frequency band according to the control of the amplitude resolution module and the frequency resolution module, so as to obtain the final multiple radar signal simulation signal.

2. The system according to claim 1, characterized in that The multiple radar scene input information includes: signal patterns, transmission powers, transmission frequencies, and distances between radars and receiving points of the multiple radars to be simulated.

3. The system according to claim 2, characterized in that The delay calculation module is specifically used for: According to the distance between each radar and the receiving point, the control value t of the delay amount simulated by each radar signal is obtained according to the following formula: i : In the formula, the control value of the delay is the time required for each radar to transmit the signal to the receiving point; d i is the distance between the radar and the receiving point; c is the speed of light; i=1,2,...,n, where n is the number of radar signal simulation modules, which is also the number of radar signals to be simulated.

4. The system according to claim 3, characterized in that The amplitude calculation module is specifically used for: The actual received arrival power P at the receiving point is calculated based on the distance between each radar and the receiving point in the multi-radar scene input information and the power transmitted by each radar. i0 ; The obtained arrival power P i0 Sort and select the largest arrival power P max , with the power P max The amplitude control is 2 N -1 is used as the basis to calculate the initial amplitude control value A of each radar i0 ; The amplitude control values ​​of all radar signals are added together according to the following formula to obtain the amplitude control value sum SUM: SUM=A 10 +A 20 +...+A i0 +...+A n0 ; According to the initial amplitude control value A i0 And the sum of the amplitude control amount SUM, the final amplitude control amount of each radar is Where N is the bit width of the digital-to-analog converter; According to the maximum arrival power P max The output power control amount of the up-conversion module is obtained by summing up the amplitude control amount SUM.

5. The system according to claim 4, characterized in that The frequency solving module is specifically used for: According to the frequency information P in the multiple radar scene input information i , get the minimum frequency P of all radar signal frequencies min and the maximum frequency P max ,Pick is the frequency control value of the up-conversion module, take is the control value of the baseband frequency of each radar signal, where f s is the sampling rate of the digital-to-analog converter.

6. A method for simulating multiple radar signals simultaneously, characterized in that: The system for simultaneously simulating multiple radar signals according to any one of claims 1 to 5, wherein the method comprises: The delay calculation module receives the distance between each radar and the receiving point in the multiple radar scene input information, and obtains the control value of the delay amount simulated by each radar signal according to the distance; The amplitude calculation module receives the distance between each radar and the receiving point and the power emitted by each radar in the input information of multiple radar scenes, and then obtains the amplitude control amount of each radar signal simulation and the power control amount of the up-conversion module; The frequency resolution module receives frequency information from multiple radar scene input information, and then obtains the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module; Several radar signal simulation modules receive the delay, amplitude and frequency control quantity of each radar signal simulation, realize single-channel radar signal simulation by digital direct frequency DDS, and obtain several radar signal simulation digital quantities; The signal synthesis module directly adds the obtained analog digital quantities of several radar signals to obtain the analog digital quantities of multiple radar signals; The digital-to-analog converter performs digital-to-analog conversion on the digital quantities of the multiple radar signal simulations to obtain intermediate frequency analog signals of the multiple radar signal simulations; The up-conversion module converts the intermediate frequency analog signal generated by the digital-to-analog converter to the corresponding frequency band according to the control of the amplitude resolution module and the frequency resolution module, and obtains the final multiple radar signal simulation signal.

7. The method according to claim 6, characterized in that The multiple radar scene input information includes: signal patterns, transmission powers, transmission frequencies, and distances between radars and receiving points of the multiple radars to be simulated.

8. The method according to claim 7, characterized in that The delay calculation module receives the distance between each radar and the receiving point in the multiple radar scene input information, and obtains the control value of the delay amount simulated by each radar signal according to the distance, specifically including: According to the distance between each radar and the receiving point, the control value t of the delay amount simulated by each radar signal is obtained according to the following formula: i : In the formula, the control value of the delay is the time required for each radar to transmit the signal to the receiving point; d i is the distance between the radar and the receiving point; c is the speed of light; i=1,2,...,n, where n is the number of radar signal simulation modules, which is also the number of radar signals to be simulated.

9. The method according to claim 8, characterized in that The amplitude calculation module receives the distance between each radar and the receiving point and the power emitted by each radar in the multiple radar scene input information, and then obtains the amplitude control amount of each radar signal simulation and the power control amount of the up-conversion module, specifically including: The actual received arrival power P at the receiving point is calculated based on the distance between each radar and the receiving point in the multi-radar scene input information and the power transmitted by each radar. i0 ; The obtained arrival power P i0 Sort and select the largest arrival power P max , with the power P max The amplitude control is 2 N -1 is used as the basis to calculate the initial amplitude control value A of each radar i0 ; The amplitude control values ​​of all radar signals are added together according to the following formula to obtain the amplitude control value sum SUM: SUM=A 10 +A 20 +...+A i0 +...+A n0 ; According to the initial amplitude control value A i0 And the sum of the amplitude control amount SUM, the final amplitude control amount of each radar is Where N is the bit width of the digital-to-analog converter; According to the maximum arrival power P max The output power control amount of the up-conversion module is obtained by summing up the amplitude control amount SUM.

10. The method according to claim 9, characterized in that The frequency calculation module receives frequency information from multiple radar scene input information, and then obtains the frequency control amount of each radar signal simulation and the frequency control amount of the up-conversion module, specifically including: According to the frequency information P in the multiple radar scene input information i , get the minimum frequency P of all radar signal frequencies min and the maximum frequency P max ,Pick is the frequency control value of the up-conversion module, take is the control value of the baseband frequency of each radar signal, where f s is the sampling rate of the digital-to-analog converter.

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