Complex electromagnetic environment construction method based on real-time pulse synchronization

Abstract

The invention discloses a complex electromagnetic environment construction method based on real-time pulse synchronization. Pulse sorting and output channel distribution are carried out according to radar priority and pulse arrival time; the radar signal simulator sends the corresponding pulse control word sequence to the corresponding radio frequency feed channel of the antenna array according to the channel distribution result of each radar pulse; each radio frequency feed channel of the antenna array calculates the control word required by each radar pulse in real time according to the received radar pulse related control word and caches the control word; each signal simulation channel of the radar signal simulator generates a corresponding radar pulse signal according to a corresponding radar pulse control word, the radar pulse signal is sent to a corresponding radio frequency feed channel of the antenna array through the real-time pulse synchronization device, and the antenna array inquires and obtains an array control word corresponding to the radar pulse according to a radar number. State switching control is carried out on the radio frequency feed channel; the maximum utilization of channel resources is realized, and the radar signal simulation number and the complex environment pulse density are improved.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency semi-physical simulation, and in particular to a method for constructing a complex electromagnetic environment based on real-time pulse synchronization. Background Art

[0002] Having good adaptability to complex electromagnetic environments is a basic requirement for radar countermeasure reconnaissance equipment, and is also a key factor in determining the role of radar countermeasure reconnaissance equipment. Therefore, it must be tested in detail during product testing. Semi-physical means can include all or part of the physical product under test into the simulation loop, which has the characteristics of high credibility of simulation results. At the same time, because the test is carried out indoors, it has the advantages of controllable environment, good repeatability, and large sample testing. It is widely used in the field of radar countermeasure reconnaissance equipment testing.

[0003] The use of semi-physical simulation methods to carry out complex electromagnetic environment adaptability tests requires that the RF simulation system be able to simulate various radar signals existing in real space and build a multi-directional, dynamic, and high-density complex electromagnetic environment required for the test. The RF simulation system usually includes a microwave darkroom, a radar signal simulator, an antenna array, and supporting interface equipment, among which the microwave darkroom is responsible for providing a space for the free propagation of electromagnetic waves, and the radar under test against battlefield equipment is deployed in the center of the microwave darkroom quiet zone; the radar signal simulator mainly generates radar signals of various systems and signal styles; the antenna array is responsible for radiating the radar signal to the microwave darkroom from different angles with a certain power and polarization, simulating the spatial angular position, power density, polarization form, etc. of each radar signal reaching the device under test, and building a dynamic, high-density complex electromagnetic signal environment in the darkroom.

[0004] There are a large number of radars in the actual space, with various platform types and different radiation signal styles. Traditional RF simulation systems usually adopt a fixed channel simulation solution, that is, the radar signal simulator designs multiple signal output channels, and the antenna array designs multiple signal radiation channels correspondingly. The radar signal simulator and the antenna array maintain a one-to-one correspondence between the channels, and each channel simulates a fixed radar signal. This solution has certain limitations: first, the number of radar radiation source simulations is heavily dependent on the number of signal simulators and antenna array channels, and the ability to simulate complex environments is limited; second, although the ability to simulate complex environments can be improved by increasing the number of channels, increasing the number of channels will lead to a large hardware scale and increased development costs; third, for each signal simulation channel, the time period between two pulses is when the simulation system is in an idle waiting period, resulting in a waste of channel resources, especially for low duty cycle radar signal simulations. The situation is even more serious, resulting in limited radar signal density simulation capabilities in electromagnetic environments. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for constructing a complex electromagnetic environment based on real-time pulse synchronization, thereby maximizing the utilization of channel resources and improving the number of radar signal simulations and the pulse density of complex environments; through a real-time pulse synchronization device, pulse-level precise synchronization between the radar signal simulator channel and the antenna array channel is achieved, ensuring precise control of the radar signal pulse amplitude, phase, and polarization, and ensuring the quality of radar signal simulation and the fidelity of complex environment simulation; it can be applicable to the construction requirements of complex electromagnetic environments of different complexity levels and has strong versatility.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a complex electromagnetic environment construction method based on real-time pulse synchronization, step 1: pulse sorting and output channel allocation according to radar priority and pulse arrival time; the specific sorting strategy is as follows: The radar is set to 3 priorities, namely 1#, 2#, and 3#. Among them, 1# priority represents key radars, which occupy the channel exclusively and do not participate in the sorting. A maximum of N radars can be set, where N is the number of radar signal simulator channels. 2# priority represents key radars and participates in the priority sorting. 3# priority represents general radars and participates in the priority sorting. For the 1# priority radar, pulse sorting is not performed, each radar occupies a channel independently, and the channel is no longer used to generate other radar signals; for the 2# priority radar, the remaining NM channels are output, and channels are allocated in the order of pulse arrival time. The specific rules are as follows: according to the relative distance between each radar and the measured radar counter-reconnaissance equipment, the number of pulses and pulse arrival time required for each radar in the current simulation cycle are calculated, and the pulses are sorted in order of arrival time. According to the pulse sorting results, each pulse signal is inserted into the corresponding output channel in turn. When there are multiple signals with the same pulse arrival time, they are selected according to the specified selection rules, and the radar pulses with time overlap that exceed the number of output channels are all discarded; For 3# priority radars, they are evenly distributed to the remaining NM channels according to the number of radars and solidified, and no cross-channel output is performed. For multiple radars assigned to the same output channel, pulse sorting and signal insertion are performed in accordance with 2# priority radars, thereby ensuring that any signal simulation channel is responsible for generating only one radar pulse signal at any time; Step 2: The radar signal simulator sends the corresponding pulse control word sequence to the corresponding RF feed channel of the antenna array according to the channel allocation result of each radar pulse; the pulse control word sequence includes radar number, center frequency, power density, and polarization form; Step 3: Each RF feeding channel of the antenna array calculates the control words required for simulation such as the angular position, amplitude, polarization, etc. corresponding to each radar pulse in real time based on the control words related to the received radar pulse and caches them; Step 4: Each signal simulation channel of the radar signal simulator generates a corresponding radar pulse signal according to the corresponding radar pulse control word, and at the same time generates a leading synchronization pulse containing the radar number information, which is sent to the corresponding RF feed channel of the antenna array through the real-time pulse synchronization device. After the antenna array receives and decodes, it obtains the array control word corresponding to the radar pulse according to the radar number query, and controls the state switching of the RF feed channel to ensure that when each radar pulse arrives, it radiates from the corresponding angular position of the antenna array with the specified amplitude and polarization form.

[0007] The beneficial effects of the present invention are as follows: adopting the complex electromagnetic environment generation technology based on real-time pulse synchronization, by setting different radar priorities, distinguishing and controlling the possession of channel resources by radars of different importance, ensuring that key radar signal pulses are fully output, important radar signal pulses are output first and general radar signals are output last; pulses are sorted according to the different times when each radar pulse arrives at the radar counter-reconnaissance equipment, realizing dynamic allocation of radar signal generation channels, so that each channel of the radar signal simulator can simulate multiple radar signals in time-sharing, and each radar signal simulation channel can be used to generate radar signals except for the channel state switching time, thereby realizing maximum utilization of channel resources and improving the number of radar signal simulations and complex environment pulse density; through a real-time pulse synchronization device, pulse-level precise synchronization between the radar signal simulator channel and the antenna array channel is realized, ensuring precise control of radar signal pulse amplitude, phase and polarization, and ensuring the quality of radar signal simulation and the fidelity of complex environment simulation; it can be applicable to the construction requirements of complex electromagnetic environments of different complexity levels, and has strong versatility; the parts not described in detail in the present invention are existing common technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a schematic diagram of the implementation principle. DETAILED DESCRIPTION

[0009] The present invention is further described in detail below in conjunction with embodiments and specific implementation modes: Example

[0010] The radar is set to 3 priorities, namely 1#, 2#, and 3#. Among them, 1# priority represents key radars, which occupy the channel exclusively and do not participate in the sorting. A maximum of N radars can be set, where N is the number of radar signal simulator channels. 2# priority represents key radars and participates in the priority sorting. 3# priority represents general radars and participates in the priority sorting. For the 1# priority radar, pulse sorting is not performed, each radar occupies a channel independently, and the channel is no longer used to generate other radar signals; for the 2# priority radar, the remaining NM channels are output, and channels are allocated in the order of pulse arrival time. The specific rules are as follows: according to the relative distance between each radar and the measured radar counter-reconnaissance equipment, the number of pulses and pulse arrival time required for each radar in the current simulation cycle are calculated, and the pulses are sorted in order of arrival time. According to the pulse sorting results, each pulse signal is inserted into the corresponding output channel in turn. When there are multiple signals with the same pulse arrival time, they are selected according to the specified selection rules, and the radar pulses with time overlap that exceed the number of output channels are all discarded; For 3# priority radars, they are evenly distributed to the remaining NM channels according to the number of radars and solidified, and no cross-channel output is performed. For multiple radars assigned to the same output channel, pulse sorting and signal insertion are performed in accordance with 2# priority radars, thereby ensuring that any signal simulation channel is responsible for generating only one radar pulse signal at any time; Step 2: The radar signal simulator sends the corresponding pulse control word sequence to the corresponding RF feed channel of the antenna array according to the channel allocation result of each radar pulse; the pulse control word sequence includes radar number, center frequency, power density, and polarization form; Step 3: Each RF feeding channel of the antenna array calculates the control words required for simulation such as the angular position, amplitude, polarization, etc. corresponding to each radar pulse in real time based on the control words related to the received radar pulse and caches them; Step 4: Each signal simulation channel of the radar signal simulator generates a corresponding radar pulse signal according to the corresponding radar pulse control word, and at the same time generates a leading synchronization pulse containing the radar number information, which is sent to the corresponding RF feed channel of the antenna array through the real-time pulse synchronization device. After the antenna array receives and decodes, it obtains the array control word corresponding to the radar pulse according to the radar number query, and controls the state switching of the RF feed channel to ensure that when each radar pulse arrives, it radiates from the corresponding angular position of the antenna array with the specified amplitude and polarization form.

[0011] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing a complex electromagnetic environment based on real-time pulse synchronization, characterized in that: Step 1: Sort pulses and allocate output channels according to radar priority and pulse arrival time; the specific sorting strategy is as follows: The radar is set to 3 priorities, namely 1#, 2#, and 3#. Among them, 1# priority represents key radars, which occupy the channel exclusively and do not participate in the sorting. A maximum of N radars can be set, where N is the number of radar signal simulator channels. 2# priority represents key radars and participates in the priority sorting. 3# priority represents general radars and participates in the priority sorting. For the 1# priority radar, pulse sorting is not performed, each radar occupies a channel independently, and the channel is no longer used to generate other radar signals; for the 2# priority radar, the remaining NM channels are output, and channels are allocated in the order of pulse arrival time. The specific rules are as follows: according to the relative distance between each radar and the measured radar counter-reconnaissance equipment, the number of pulses and pulse arrival time required for each radar in the current simulation cycle are calculated, and the pulses are sorted in order of arrival time. According to the pulse sorting results, each pulse signal is inserted into the corresponding output channel in turn. When there are multiple signals with the same pulse arrival time, they are selected according to the specified selection rules, and the radar pulses with time overlap that exceed the number of output channels are all discarded; For 3# priority radars, they are evenly distributed to the remaining NM channels according to the number of radars and solidified, and no cross-channel output is performed. For multiple radars assigned to the same output channel, pulse sorting and signal insertion are performed in accordance with 2# priority radars, thereby ensuring that any signal simulation channel is responsible for generating only one radar pulse signal at any time; Step 2: The radar signal simulator sends the corresponding pulse control word sequence to the corresponding RF feed channel of the antenna array according to the channel allocation result of each radar pulse; the pulse control word sequence includes radar number, center frequency, power density, and polarization form; Step 3: Each RF feeding channel of the antenna array calculates the control words required for simulation such as the angular position, amplitude, polarization, etc. corresponding to each radar pulse in real time based on the control words related to the received radar pulse and caches them; Step 4: Each signal simulation channel of the radar signal simulator generates a corresponding radar pulse signal according to the corresponding radar pulse control word, and at the same time generates a leading synchronization pulse containing the radar number information, which is sent to the corresponding RF feed channel of the antenna array through the real-time pulse synchronization device. After the antenna array receives and decodes, it obtains the array control word corresponding to the radar pulse according to the radar number query, and controls the state switching of the RF feed channel to ensure that when each radar pulse arrives, it radiates from the corresponding angular position of the antenna array with the specified amplitude and polarization form.

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