A single-channel multi-angle target simulation method and system

Abstract

The present application discloses a single-channel multi-angle target simulation method and system, which includes generating a pulse parameter table, obtaining the triplet to which the electromagnetic target signals of radars at different angular positions belong in the radio frequency array, determining the amplitude difference and phase difference on the three branches corresponding to the triplet, and generating a triplet amplitude-phase deviation table; obtaining the control words corresponding to the three antenna numbers according to the three antenna numbers of the triplet to which the current radar pulse signal belongs, sending the control words to the control digital control switch group, and then sending the three branch signals to the three branch antennas of the corresponding triplet respectively, thereby realizing the switching of the triplet; the triplet corresponding to the radio frequency array radiates the current radar pulse signal, and the signals of the three branches are finally synthesized into the electromagnetic target signal of the angular position. Without increasing the simulator hardware equipment, the present application expands the number of target simulations, improves the simulation fidelity of complex electromagnetic environments, and reduces system complexity and hardware costs.

Description

Technical Field

[0001] The present application relates to the field of microwave radio frequency technology, and in particular to a single-channel multi-angle target simulation method and system. Background Art

[0002] With the development of electronic equipment and RF simulation technology, there is an increasing demand for conducting simulation tests in complex electromagnetic environments within microwave anechoic chambers. Simulating complex electromagnetic environments requires generating a large number of signals. To realistically simulate the actual electromagnetic environment, the simulated signals should be distributed at different locations relative to the signal receiving device. Within the microwave anechoic chamber, electromagnetic target signals from different locations are simulated using signal simulators and RF array antennas. Generally, one simulator channel can simulate one electromagnetic target signal. If a large number of electromagnetic signals needs to be simulated, a corresponding number of simulator devices are required. However, increasing the number of simulator devices will significantly increase system complexity and hardware costs. If you want to simulate a large number of electromagnetic target signals within a limited number of simulator devices, you need a single signal simulator channel to generate multiple RF signals, which are simultaneously emitted from different angular positions of the RF antenna array.

[0003] CN118054804A “A portable L-band multi-signal simulation source and generation method” discloses a multi-signal simulation source and generation method, which combines the characteristics of single-simulator time-sharing simulation and multi-simulator distributed simulation. However, this method does not solve the problem of a single-channel simulator simulating electromagnetic signals at multiple locations in a radio frequency simulation microwave darkroom. In addition, CN103760539A “Radar multi-target echo simulation system and method” can output a variety of delayed electromagnetic target signals by introducing a counter, thereby simulating multiple radar echo targets. However, this method does not explain how to use a single-channel simulator to simulate electromagnetic signals at multiple locations in a radio frequency simulation microwave darkroom. In the application of radio frequency simulation in a microwave darkroom, the above-mentioned multi-target simulator device can only generate multiple electromagnetic target signals in the radial direction of the signal receiving device, and cannot realistically simulate the real electromagnetic environment. If it is necessary to simulate electromagnetic signals at multiple angular positions, it is necessary to increase the number of simulator channels, which will lead to a significant increase in system volume and cost. Summary of the Invention

[0004] In view of this, the present application provides a single-channel multi-angle target simulation method and system, which, for a microwave anechoic chamber based on a radio frequency antenna array, enables one signal simulator channel to simultaneously simulate electromagnetic target signals in multiple different directions, thereby expanding the number of target simulations and improving the realism of complex electromagnetic environment simulation without increasing the simulator hardware equipment.

[0005] This application discloses a single-channel multi-angle target simulation method, which includes:

[0006] The generation unit combines the pulse information of radars at different angular positions, generates a pulse parameter table and sends it to the target signal simulator;

[0007] The generation unit obtains the triplet of electromagnetic target signals of radars at different angular positions in the radio frequency array based on the radar angular position information, determines the amplitude difference and phase difference on the three branches corresponding to the triplet, generates a triplet amplitude-phase deviation table, and sends it to the array control unit; the triplet amplitude-phase deviation table records the antenna numbers, amplitude differences, and phase differences of the three different branches;

[0008] The target signal simulator generates a video pulse according to the pulse parameter table, generates a radar pulse signal according to the video pulse, and sends the video pulse and the corresponding radar pulse signal to the array control unit;

[0009] The array control unit learns the moment when the angular position of the radar pulse signal changes based on the video pulse, obtains the triplet antenna number to which the radar pulse signal belongs at that moment, as well as the amplitude difference and phase difference on the three branches from the triplet amplitude and phase deviation table when the angular position changes, corrects the amplitude based on the phase difference, and then obtains the final amplitude of the three branches based on the amplitude difference; obtains the amplitude control word and phase control word corresponding to the final amplitude and phase difference to control the amplitude difference and phase difference of the three branches of the array control unit;

[0010] According to the three antenna numbers of the triplet to which the current radar pulse signal belongs, the control words corresponding to the three antenna numbers are obtained and sent to the control digital control switch group, so that the three branch signals can be sent to the three branch antennas of the corresponding triplet respectively, thereby realizing the switching of the triplet;

[0011] The triplet corresponding to the RF array radiates the current radar pulse signal, and the signals of the three branches are finally synthesized into the electromagnetic target signal of the angular position.

[0012] Furthermore, the angular position refers to the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable. After determining the triplet, the angular position of the electromagnetic target signal is expressed by the angular scintillation equation; the RF array is placed above the turntable.

[0013] Furthermore, the angular scintillation equation is used to accurately describe the position of the electromagnetic target signal angular position within the equilateral triangle corresponding to the triplet. The angular scintillation equation is expressed as:

[0014]

[0015]

[0016] The premise for the angular scintillation equation to be valid is that the phases of the three antennas in the triplet are consistent. The phase difference between the three antennas in different triplet groups can be measured in advance through the phase shifter in the array control unit.

[0017] in, 、 、 are the azimuth coordinates of the three antennas in the triplet, 、 、 are the elevation angle coordinates of the three antennas in the triplet, is the azimuth of the electromagnetic target signal, is the elevation angle of the electromagnetic target signal, 、 、 is the amplitude of the radiation signals of the three antennas, which can be controlled by the amplitude attenuator in the array control unit;

[0018] If the azimuth and elevation angles of the electromagnetic target signal are known, the radiation amplitudes of the target in the three antennas of the triplet can be obtained. By controlling the radiation amplitudes, the position of the target in the triplet can be precisely controlled.

[0019] Furthermore, the azimuth angle refers to the horizontal component of the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable; the pitch angle refers to the vertical component of the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable.

[0020] Furthermore, the radar pulse signal has different angular positions at different times. At different angular positions, it is radiated by the corresponding three branches with corresponding amplitude deviations and phase deviations. The order of angular position changes of the radar pulse signal is consistent with the order of angular position changes in the triplet amplitude and phase deviation table.

[0021] Furthermore, the video pulse indicates when the angular position of the radar pulse signal changes.

[0022] Furthermore, the array control unit uses a power divider to divide the input radar pulse signal into three paths; uses three groups of amplitude attenuators and phase shifters to control the amplitude difference and phase difference corresponding to the three branches; and uses a digitally controlled switch group to distribute the three branch signals to the three antennas of the triplet according to the antenna number.

[0023] Furthermore, when the generating unit combines the pulse information of the radars at different angular positions, the pulse periods of the radars at different angular positions are consistent, and the radial distances of the radars at different angular positions are sufficiently different so that the signals of the radars are separable in the time domain;

[0024] In the generated pulse parameter table, the pulse width is the pulse width of each electromagnetic target signal, and the pulse period can be calculated based on the radial distance difference between two adjacent radar positions.

[0025] Furthermore, the triplet refers to three adjacent antennas arranged in a radio frequency array at the intersection of an equilateral triangle grid. The three antennas radiate three branch signals with deviations in amplitude and phase, and synthesize an electromagnetic target signal located at a specified angular position.

[0026] The present application also discloses a single-channel multi-angle target simulation system to implement the above-mentioned single-channel multi-angle target simulation method, which includes a generation unit, a target simulator, an array control unit and a radio frequency array; the generation unit stores real-time software; the array control unit is connected to the generation unit, the target simulator and the radio frequency array respectively; the array control unit includes a power divider, an amplitude attenuator, a phase shifter and a digital control switch group connected in sequence; the target simulator is connected to the power divider; the digital control switch group includes multiple switches, and the switches and phase shifters are connected one-to-one; each switch is connected to the corresponding antenna in the radio frequency array through the antenna number.

[0027] Due to the adoption of the above-mentioned technical solution, the present application has the following advantages: for a microwave darkroom based on a radio frequency antenna array, a signal simulator channel is implemented to simultaneously simulate multiple (up to 8) electromagnetic target signals in different directions, thereby expanding the number of target simulations without increasing the simulator hardware equipment, improving the electromagnetic environment simulation capability, improving the realism of complex electromagnetic environment simulation, and reducing system complexity and hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 A schematic flow chart of a single-channel multi-angle target simulation method according to an embodiment of the present application;

[0030] Figure 2 This is a block diagram of a single-channel multi-angle target simulation system according to an embodiment of the present application;

[0031] Figure 3 A schematic diagram showing the relationship between the three antennas of the triplet according to an embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the control flow of the array control unit according to an embodiment of the present application;

[0033] Figure 5This is a schematic diagram of single-channel multi-angle target signal reception according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The present application is further described with reference to the accompanying drawings and embodiments. The embodiments described are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0035] See also Figure 1 , the present application provides an embodiment of a single-channel multi-angle target simulation method, which includes:

[0036] The generation unit combines the pulse information of radars at different angular positions, generates a pulse parameter table and sends it to the target signal simulator;

[0037] The generation unit obtains the triplet to which the electromagnetic target signals of radars at different angular positions belong in the RF array based on the radar angular position information, and simultaneously determines the amplitude difference and phase difference on the three branches corresponding to the triplet, generates a triplet amplitude-phase deviation table and sends it to the array control unit; the triplet amplitude-phase deviation table records the different three-branch antenna numbers, amplitude differences, and phase differences; specifically, based on the angular position calibrated in advance, as well as the triplet antenna number to which the angular position belongs, the triplet branch signal amplitude deviation, and the triplet branch signal phase deviation, the triplet to which the electromagnetic target signals of radars at different angular positions belong in the RF array can be calculated, the amplitude and phase differences on branches A, B, and C in the triplet can be determined, and the triplet amplitude-phase deviation table can be generated.

[0038] The target signal simulator generates a video pulse according to the pulse parameter table, generates a radar pulse signal according to the video pulse, and sends the video pulse and the corresponding radar pulse signal to the array control unit;

[0039] The array control unit learns the moment when the angular position of the radar pulse signal changes based on the video pulse, obtains the triplet antenna number to which the radar pulse signal belongs at that moment, as well as the amplitude difference and phase difference on the three branches from the triplet amplitude and phase deviation table when the angular position changes, corrects the amplitude based on the phase difference, and then obtains the final amplitude of the three branches based on the amplitude difference; obtains the amplitude control word and phase control word corresponding to the final amplitude and phase difference to control the amplitude difference and phase difference of the three branches of the array control unit;

[0040] According to the three antenna numbers of the triplet to which the current radar pulse signal belongs, the control words corresponding to the three antenna numbers are obtained and sent to the control digital control switch group, so that the three branch signals can be sent to the three branch antennas of the corresponding triplet respectively, thereby realizing the switching of the triplet;

[0041] The triplet corresponding to the RF array radiates the current radar pulse signal, and the signals of the three branches are finally synthesized into the electromagnetic target signal of the angular position.

[0042] Based on the above embodiment, as time changes, the target signal simulator generates changing video pulses and radar pulse signals. The array control unit reads different data in the ternary amplitude and phase deviation table according to the video pulse, generates changing amplitude and phase control words, and finally synthesizes the electromagnetic target signal with changed angular position, realizing single-channel multi-angle target simulation.

[0043] Optionally, the radio frequency array radiates the three branch signals modulated by amplitude difference and phase difference from corresponding antennas into the darkroom under the control of the array control unit.

[0044] Optionally, the angular position refers to the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable. After the triplet is determined, the angular position of the electromagnetic target signal is expressed by the angular scintillation equation; the RF array is placed above the turntable.

[0045] Optionally, the angular scintillation equation is used to accurately describe the position of the electromagnetic target signal angular position within the equilateral triangle corresponding to the triplet. The angular scintillation equation is expressed as:

[0046]

[0047]

[0048] The premise for the angular scintillation equation to be valid is that the phases of the three antennas in the triplet are consistent. The phase difference between the three antennas in different triplet groups can be measured in advance through the phase shifter in the array control unit.

[0049] in, 、 、 are the azimuth coordinates of the three antennas in the triplet, 、 、 are the elevation angle coordinates of the three antennas in the triplet, is the azimuth of the electromagnetic target signal, is the elevation angle of the electromagnetic target signal, 、 、 is the radiation signal amplitude of the three antennas, which can be controlled by the amplitude attenuator in the array control unit; Figure 3 As shown;

[0050] If the azimuth and elevation angles of the electromagnetic target signal are known, the radiation amplitudes of the target in the three antennas of the triplet can be obtained. By controlling the radiation amplitudes, the position of the target in the triplet can be precisely controlled.

[0051] Optionally, the azimuth angle refers to the horizontal component of the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable; the pitch angle refers to the vertical component of the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable.

[0052] Optionally, the radar pulse signal has different angular positions at different times. At different angular positions, it is radiated by the corresponding three branches with corresponding amplitude deviations and phase deviations. The order of angular position changes of the radar pulse signal is consistent with the order of angular position changes in the triplet amplitude and phase deviation table.

[0053] Optionally, the video pulse indicates when the radar pulse signal changes angular position.

[0054] Optionally, a power divider is used in the array control unit to divide the input radar pulse signal into three paths; three groups of amplitude attenuators and phase shifters are used to control the amplitude difference and phase difference of the corresponding three branches; and a digitally controlled switch group is used to distribute the three branch signals to the three antennas of the triplet according to the antenna number.

[0055] Optionally, when the generating unit combines the pulse information of the radars at different angular positions, the pulse periods of the radars at different angular positions are consistent, and the radial distances of the radars at different angular positions are different enough to make the signals of the radars separable in the time domain;

[0056] In the generated pulse parameter table, the pulse width is the pulse width of each electromagnetic target signal, and the pulse period can be calculated based on the radial distance difference between two adjacent radar positions. Specifically, the calculation formula is: ,in, is the pulse period, is the radial distance difference between two adjacent radars (unit: m), and c is the speed of light (unit: m / s). To simplify the calculation, the speed of light can be assumed to be 300,000,000 m / s. In this table, each 1 µs period corresponds to a 300 m interval. Table 1 shows the pulse parameters.

[0057] Optionally, a triplet refers to three adjacent antennas arranged in a radio frequency array at the intersection of an equilateral triangle grid, and the three antennas radiate three branch signals with deviations in amplitude and phase, and synthesize an electromagnetic target signal located at a specified angular position.

[0058] See also Figure 2The present application also provides an embodiment of a single-channel multi-angle target simulation system, which implements the single-channel multi-angle target simulation method described in the above embodiment, and includes a generation unit, a target simulator, an array control unit and a radio frequency array; the generation unit stores real-time software; the array control unit is respectively connected to the generation unit, the target simulator and the radio frequency array; the array control unit includes a power divider, an amplitude attenuator, a phase shifter and a digital control switch group connected in sequence; the target simulator is connected to the power divider; the digital control switch group includes multiple switches, and the switches and phase shifters are connected one-to-one; each switch is connected to the corresponding antenna in the radio frequency array through the antenna number.

[0059] For ease of understanding, this application provides a more specific embodiment:

[0060] Step 1: The pulse information of radars at different angular positions is combined in the generation unit. The pulse periods of the radars at different angular positions are consistent, and the radial distances of the radars at different angular positions are different enough to make the signals of the radars separable in the time domain.

[0061] Specifically, as shown in Table 1, a set of pulse parameter tables is generated, where the pulse width is the pulse width of each electromagnetic target signal, and the pulse period is calculated based on the radial distance difference between two adjacent radar positions. The calculation formula is: ,in is the pulse period, is the radial distance difference between two adjacent radar positions (unit: m), and c is the speed of light (unit: m / s).

[0062] Table 1 Example of pulse parameter table

[0063]

[0064] To simplify the calculation, the speed of light can be taken as 300,000,000 m / s. Then, each 1 us period in the table corresponds to a 300 m interval.

[0065] In step 2, the generation unit calculates the triplet of electromagnetic target signals at different angular positions in the RF array and the amplitude and phase differences on branches A, B, and C (three branches) in the triplet based on the angular position amplitude and phase parameters calibrated in advance, and generates a triplet amplitude and phase deviation table, as shown in Table 2.

[0066] Table 2 Examples of triplet amplitude and phase deviations

[0067]

[0068] Specifically, the triplet amplitude-phase deviation table records the triplet number to which each electromagnetic target signal belongs and the amplitude difference and phase difference of the A, B, and C branches.

[0069] Step 3: Send the triplet amplitude and phase deviation table to the array control unit.

[0070] Step 4: Send the pulse parameter table to the target signal simulator.

[0071] Step 5: The target signal simulator generates a video pulse according to the pulse parameter table and transmits it to the array control unit.

[0072] Step 6: The target signal simulator generates a series of radar pulse signals based on the video pulses generated by the pulse parameter table and sends the signals to the array control unit.

[0073] Step 7, see Figure 4 The array control unit obtains the triplet to which the current radar pulse signal belongs from the triplet amplitude and phase deviation table according to the video pulse, and searches for the respective amplitude difference and phase difference according to the triplet and the A, B, and C branch antenna numbers. Different phase differences will have a slight effect on the amplitude. The amplitude is corrected according to the phase difference, and finally the amplitude and phase control words are generated.

[0074] Specifically, the array control unit uses a power divider to divide one input signal into three paths; according to the amplitude and phase difference of the current radar pulse signal on branches A, B, and C, the amplitude and phase control words corresponding to different amplitudes and phase differences can be obtained by referring to the manual of the amplitude attenuator and phase shifter. The amplitude and phase control words are sent to the three groups of amplitude attenuators and phase shifters A, B, and C respectively to control the amplitude and phase differences on branches A, B, and C; according to the three antenna numbers of the triplet to which the current radar pulse signal belongs, the control words corresponding to different antenna numbers can be obtained by referring to the manual of the digital control switch group. The control words are sent to the control digital control switch group, and the A, B, and C branch signals can be sent to the A, B, and C branch antennas of the corresponding triplet respectively, thereby realizing switching of the triplet.

[0075] Step 8: The specific triplet of the radio frequency array radiates the current radar pulse signal, and the signals of the three branches A, B, and C are finally synthesized into the electromagnetic target signal at a specific angular position. Figure 5 As shown, since the radial distance and angular position of each electromagnetic target signal are different, their amplitudes are different, so they can be easily distinguished by an oscilloscope.

[0076] Step 9: As time changes, the target signal simulator generates changing video pulses and radar pulse signals. The array control unit reads different data in the ternary amplitude and phase deviation table according to the video pulse, generates changing amplitude and phase control words, and finally synthesizes the electromagnetic target signal with changed angular position to realize single-channel multi-angle target simulation.

[0077] It should be noted that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A single-channel multi-angle target simulation method, characterized in that: include: The generation unit combines the pulse information of radars at different angular positions, generates a pulse parameter table and sends it to the target signal simulator; The pulse parameter table includes pulse period and pulse width; The generation unit obtains the triplet of electromagnetic target signals of radars at different angular positions in the radio frequency array based on the radar angular position information, determines the amplitude difference and phase difference on the three branches corresponding to the triplet, generates a triplet amplitude-phase deviation table, and sends it to the array control unit; the triplet amplitude-phase deviation table records the antenna numbers, amplitude differences, and phase differences of the three different branches; The target signal simulator generates a video pulse according to the pulse parameter table, generates a radar pulse signal according to the video pulse, and sends the video pulse and the corresponding radar pulse signal to the array control unit; The array control unit learns the moment when the angular position of the radar pulse signal changes based on the video pulse, obtains the triplet antenna number to which the radar pulse signal belongs at that moment, as well as the amplitude difference and phase difference on the three branches from the triplet amplitude and phase deviation table when the angular position changes, corrects the amplitude based on the phase difference, and then obtains the final amplitude of the three branches based on the amplitude difference; obtains the amplitude control word and phase control word corresponding to the final amplitude and phase difference to control the amplitude difference and phase difference of the three branches of the array control unit; According to the three antenna numbers of the triplet to which the current radar pulse signal belongs, the control words corresponding to the three antenna numbers are obtained and sent to the control digital control switch group, so that the three branch signals can be sent to the three branch antennas of the corresponding triplet respectively, thereby realizing the switching of the triplet; The triplet corresponding to the RF array radiates the current radar pulse signal, and the signals of the three branches are finally synthesized into the electromagnetic target signal of the angular position.

2. The single-channel multi-angle target simulation method according to claim 1, characterized in that: The angular position refers to the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable. After the triplet is determined, the angular position of the electromagnetic target signal is expressed using the angular scintillation equation; the RF array is placed in front of the turntable.

3. The single-channel multi-angle target simulation method according to claim 2, characterized in that: The angular scintillation equation is used to accurately describe the position of the angular position of the electromagnetic target signal within the equilateral triangle corresponding to the triplet. The premise for the angular scintillation equation is that the phases of the three antennas in the triplet are consistent. The phase difference between the three antennas in different triplet groups can be measured in advance through the phase shifter control in the array control unit. If the azimuth and elevation angles of the electromagnetic target signal are known, the radiation amplitudes of the target in the three antennas of the triplet can be obtained. By controlling the radiation amplitudes, the position of the target in the triplet can be precisely controlled.

4. The single-channel multi-angle target simulation method according to claim 3, characterized in that: The azimuth angle refers to the horizontal component of the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable; the pitch angle refers to the vertical component of the angle between the position of the electromagnetic target signal detected at the turntable and the direction directly in front of the turntable.

5. The single-channel multi-angle target simulation method according to claim 1, characterized in that: The radar pulse signal has different angular positions at different times. At different angular positions, it is radiated by the corresponding three branches with corresponding amplitude deviations and phase deviations. The order of angular position changes of the radar pulse signal is consistent with the order of angular position changes in the triplet amplitude and phase deviation table.

6. The single-channel multi-angle target simulation method according to claim 1, characterized in that: The video pulse indicates when the angular position of the radar pulse signal changes.

7. The single-channel multi-angle target simulation method according to claim 1, characterized in that: The array control unit uses a power divider to divide the input radar pulse signal into three paths; uses an amplitude attenuator and a phase shifter to control the amplitude difference and phase difference of the corresponding three branches; and uses a digitally controlled switch group to distribute the three branch signals to the three antennas of the triplet according to the antenna number.

8. The single-channel multi-angle target simulation method according to claim 1, characterized in that: When the generating unit combines the pulse information of the radars at different angular positions, the pulse periods of the radars at different angular positions are consistent, and the radial distances of the radars at different angular positions are different enough to make the signals of the radars separable in the time domain; The pulse width in the pulse parameter table is the pulse width of each electromagnetic target signal, and the pulse period can be calculated based on the radial distance difference between two adjacent radar positions.

9. The single-channel multi-angle target simulation method according to claim 1, characterized in that: The triplet refers to three adjacent antennas arranged in an RF array at the intersection of an equilateral triangle grid. The three branch signals with deviations in radiation amplitude and phase from the three antennas are synthesized into an electromagnetic target signal located at a specified angular position.

10. A single-channel multi-angle target simulation system, implementing the single-channel multi-angle target simulation method according to any one of claims 1 to 9, characterized in that: It includes a generation unit, a target simulator, an array control unit and a radio frequency array; The generation unit stores real-time software; the array control unit is connected to the generation unit, the target simulator and the radio frequency array respectively; the array control unit includes a power divider, an amplitude attenuator, a phase shifter and a digital control switch group connected in sequence; the target simulator is connected to the power divider; the digital control switch group includes multiple switches, and the switches and phase shifters are connected one by one; each switch is connected to the corresponding antenna in the radio frequency array through the antenna number.

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