Complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing

Abstract

A complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing comprises a common-platform multi-radiation source signal digital domain synthesis generation technology, an antenna array multi-radiation source synthesis signal feed control technology and a common-platform multi-radiation source synthesis signal generation channel and independent platform radiation source signal generation channel multiplexing technology. On the premise that the number of channels of the simulation system is not changed, the signal pulse simulation number of the system is remarkably increased, the radiation source pulse loss rate is reduced, the electromagnetic environment complexity is improved, and the test result quality is improved; the method has the technical advantages of a traditional technical scheme, and when the condition that multiple radiation sources are carried on the same platform does not exist, a complex electromagnetic environment can be constructed in a pulse sorting and channel multiplexing mode according to the implementation thought of a traditional radio frequency simulation system; on the premise that the requirement for complex electromagnetic environment simulation is not changed, the requirement for the number of channels of a simulation system can be reduced, the hardware scale and technical complexity of the simulation system are reduced, the development cost of the simulation system is reduced, and the test cost-effectiveness ratio is increased.

Description

Technical Field

[0001] The invention belongs to the field of electronic information technology, and mainly relates to a complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing. Background Art

[0002] The ability to adapt to complex electromagnetic environments is one of the important performance requirements of radar countermeasure reconnaissance equipment, and is also a key test item in equipment performance testing. During testing, a dynamic, high-density complex electromagnetic signal environment needs to be provided.

[0003] The test of radar countermeasure reconnaissance equipment's ability to adapt to complex electromagnetic environments is carried out through simulation, requiring the RF simulation system to realistically simulate various radiation source signals in the actual space and build an all-round, dynamic, and high-density complex electromagnetic signal environment. The RF simulation system is usually composed of a microwave darkroom, a signal simulator, an antenna array, etc. The microwave darkroom provides a space for electromagnetic waves to propagate freely, the signal simulator is responsible for generating various radar radiation source signals, and the antenna array is responsible for radiating the radar radiation source signals generated by the signal simulator to the microwave darkroom, thereby building a complex electromagnetic signal environment with multi-domain changes in time, space, frequency, energy, polarization, etc. in the darkroom.

[0004] There are two main implementation ideas for traditional RF simulation of complex electromagnetic environments: one is to use a multi-channel signal simulator + multi-channel antenna array implementation method. Each channel of the signal simulator and the antenna array simulates a fixed radiation source signal, and the complexity of the environment simulation is increased by increasing the number of channels. The signal simulator and the antenna array channels are composed of a large number of expensive RF devices. Adding channels will lead to a large system scale, high cost, and large application limitations. The other is to queue all signals in chronological order, and select signals that exceed the number of system channels and overlap in time according to certain priority rules to achieve dynamic allocation of signals between channels, improve signal pulse output rate, and enhance the ability to simulate complex environments. However, this method is essentially dependent on the number of channels. When the number of channels is insufficient, the signal loss rate will be high, which will affect the sorting and identification of the radar countermeasures reconnaissance equipment under test, resulting in unreasonable test results.

[0005] In real space, radar countermeasure reconnaissance equipment faces a large number of radiation sources, with various types of carrier platforms, and the same platform can carry multiple radiation sources with different functions or signal styles. Therefore, during simulation testing, how to enable the RF simulation system to use limited hardware resources to simultaneously simulate the signals of multiple radiation sources in space has become an urgent problem to be solved. Summary of the invention

[0006] In order to overcome the above-mentioned deficiencies, the present invention provides a complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing.

[0007] The technical solution adopted by the present invention to solve its technical problem is: A complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing includes the following steps: 1) According to the test scenario, the radiation sources are divided into two categories: one is multiple radiation sources mounted on the same platform, called common platform radiation sources; the other is radiation sources on other independent platforms, called independent platform radiation sources; 2) For the common platform radiation source, a channel of the signal simulator is selected as a dedicated channel, and the signals of each radiation source are sorted in the order of their arrival time at the radar counter-reconnaissance equipment under test to obtain a pulse signal sequence. The signal simulator simulates and generates the baseband digital signal sequence of each radiation source signal, and the center frequency corresponding to one of the radiation source signals is selected as the reference frequency. According to the arrival time difference, center frequency difference, amplitude and phase difference required for signal polarization simulation of each radiation source signal, and the antenna array feed channel amplitude and phase difference caused by the signal center frequency difference, each baseband digital signal is subjected to time delay, amplitude and phase modulation, and then each baseband digital signal is digitally synthesized to obtain a baseband digital synthesized signal; 3) The baseband digital synthesized signal in step 2) is subjected to D / A and up-conversion to obtain a radio frequency synthesized signal, and sent to the corresponding feed channel of the antenna array; the antenna array feed channel is based on the radiation source signal corresponding to the reference frequency, completes the uniform amplitude control and coarse position control of the signal, and then radiates it into the microwave darkroom to simulate the power density and spatial angular position of each radiation source signal reaching the radar countermeasure reconnaissance equipment under test; 4) For independent platform radiation sources, after sorting the signals of each radiation source according to their arrival time, pulse selection is performed based on the number of remaining channels and the priority criteria determined in advance. Channel multiplexing is used to realize the dynamic allocation of each signal among the channels. The signal simulator generates the signal and outputs it through the corresponding channel. It is sent to the antenna array to complete the coarse position control, fine position control, amplitude and polarization simulation control, and then radiates into the microwave darkroom; 5) When the common platform radiation source situation disappears, the corresponding signal simulator channel and antenna array RF feed channel automatically switch to the independent platform radiation source simulation mode, and its function is the same as the channel function described in the above step 4).

[0008] The complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing provided by the present invention has the following advantages: First, under the premise that the number of simulation system channels remains unchanged, the number of signal pulse simulations in the system can be significantly increased, the radiation source pulse loss rate can be reduced, the complexity of the electromagnetic environment can be increased, and the quality of the test results can be improved; Second, it combines the technical advantages of traditional technical solutions. When there are no multiple radiation sources on the same platform, it can build a complex electromagnetic environment through pulse sequencing and channel multiplexing according to the traditional RF simulation system implementation ideas; Third, under the premise that the demand for complex electromagnetic environment simulation remains unchanged, the number of simulation system channels can be reduced, the hardware scale and technical complexity of the simulation system can be reduced, the development cost of the simulation system can be reduced, and the test cost-effectiveness can be improved. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0010] A complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing includes the following steps: 1) According to the test scenario, the radiation sources are divided into two categories: one is multiple radiation sources mounted on the same platform (vehicle, aircraft or ship), called common platform radiation sources; the other is radiation sources on other independent platforms, called independent platform radiation sources; 2) For the common platform radiation source, a channel of the signal simulator is selected as a dedicated channel, and the signals of each radiation source are sorted in the order of their arrival time at the radar counter-reconnaissance equipment under test to obtain a pulse signal sequence. The signal simulator simulates and generates the baseband digital signal sequence of each radiation source signal, and the center frequency corresponding to one of the radiation source signals is selected as the reference frequency. According to the arrival time difference, center frequency difference, amplitude and phase difference required for signal polarization simulation of each radiation source signal, and the antenna array feed channel amplitude and phase difference caused by the signal center frequency difference, each baseband digital signal is subjected to time delay, amplitude and phase modulation, and then each baseband digital signal is digitally synthesized to obtain a baseband digital synthesized signal; 3) The baseband digital synthesized signal in step 2) is subjected to D / A and up-conversion to obtain a radio frequency synthesized signal, and sent to the corresponding feed channel of the antenna array; the antenna array feed channel is based on the radiation source signal corresponding to the reference frequency, completes the uniform amplitude control and coarse position control of the signal, and then radiates it into the microwave darkroom to simulate the power density and spatial angular position of each radiation source signal reaching the radar countermeasure reconnaissance equipment under test; 4) For independent platform radiation sources, after sorting the signals of each radiation source according to their arrival time, pulse selection is performed based on the number of remaining channels and the priority criteria determined in advance. Channel multiplexing is used to realize the dynamic allocation of each signal among the channels. The signal simulator generates the signal and outputs it through the corresponding channel. It is sent to the antenna array to complete the coarse position control, fine position control, amplitude and polarization simulation control, and then radiates into the microwave darkroom; 5) When the common platform radiation source situation disappears, the corresponding signal simulator channel and antenna array RF feed channel automatically switch to the independent platform radiation source simulation mode, and its function is the same as the channel function described in the above step 4).

[0011] The present invention includes a common platform multi-radiation source signal digital domain synthesis generation technology, an antenna array multi-radiation source synthesis signal feeding control technology, and a common platform multi-radiation source synthesis signal generation channel and an independent platform radiation source signal generation channel multiplexing technology, which has advanced concepts, economical solutions, strong versatility and good applicability. Under the premise that the number of simulation system channels remains unchanged, the number of signal pulse simulations of the system can be significantly increased, the radiation source pulse loss rate can be reduced, the complexity of the electromagnetic environment can be improved, and the quality of test results can be improved. It has the technical advantages of traditional technical solutions. When there are no multiple radiation sources on the same platform, a complex electromagnetic environment can be constructed by pulse sorting and channel multiplexing in accordance with the traditional radio frequency simulation system implementation ideas. Under the premise that the complex electromagnetic environment simulation requirements remain unchanged, the number of simulation system channels can be reduced, the hardware scale and technical complexity of the simulation system can be reduced, the development cost of the simulation system can be reduced, and the test cost-effectiveness can be improved.

[0012] The parts not described in detail in the above content are prior art, so they are not described in detail.

Claims

1. A complex electromagnetic environment simulation method based on digital domain synthesis and channel multiplexing, characterized by: The steps include: (1) According to the test scenario, the radiation sources are divided into two categories: one is multiple radiation sources mounted on the same platform, called common platform radiation sources; the other is radiation sources on other independent platforms, called independent platform radiation sources; (2) For the common platform radiation source, a channel of the signal simulator is selected as a dedicated channel, and the radiation source signals are sorted in the order of their arrival time at the radar counter-reconnaissance equipment under test to obtain a pulse signal sequence. The signal simulator simulates and generates the baseband digital signal sequence of each radiation source signal, and the center frequency corresponding to one of the radiation source signals is selected as the reference frequency. According to the arrival time difference, center frequency difference, amplitude and phase difference required for signal polarization simulation, and antenna array feed channel amplitude and phase difference caused by the signal center frequency difference of each radiation source signal, each baseband digital signal is subjected to time delay, amplitude and phase modulation, and then each baseband digital signal is digitally synthesized to obtain a baseband digital synthesized signal; (3) The baseband digital synthesized signal in step 2) is subjected to D / A and up-conversion to obtain a radio frequency synthesized signal, which is then sent to the corresponding feed channel of the antenna array; the antenna array feed channel uses the radiation source signal corresponding to the reference frequency as a basis, completes the uniform amplitude control and coarse position control of the signal, and then radiates it into the microwave darkroom to simulate the power density and spatial angular position of each radiation source signal reaching the radar countermeasure reconnaissance equipment under test; (4) For independent platform radiation sources, the signals of each radiation source are sorted according to their arrival time, and pulse selection is performed based on the number of remaining channels and the priority criteria determined in advance. The signals are dynamically allocated among the channels through channel multiplexing. The signal simulator generates the signal and outputs it through the corresponding channel. The signal is sent to the antenna array to complete the coarse position control, fine position control, amplitude and polarization simulation control, and then radiated into the microwave darkroom. (5) When the common platform radiation source situation disappears, the corresponding signal simulator channel and antenna array RF feed channel automatically switch to the independent platform radiation source simulation mode, and its function is the same as the channel function described in the above step (4).