A Static Simulation Method and Device for Radar Dynamic Scanning Signals

Abstract

The present application discloses a method for static simulation of radar dynamic scanning signals, comprising the following steps: determining the pulse width according to the reflection duration of the radar scanning target; determining the pulse period according to the duration of one week of radar scanning; and sending a radio frequency pulse signal to the target using a stationary antenna according to the pulse width and the pulse period. The present application also includes a device for implementing the method. The method and device of the present application simplify the mechanical facilities for radar scanning measurement.

Description

Technical Field

[0001] This application relates to the field of radar technology, and particularly to a method and device for static simulation of radar dynamic scanning signals. Background Art

[0002] Radar mainly uses a modulated waveform and a directional antenna to emit electromagnetic energy into a specific airspace to detect targets. Targets in this airspace will reflect a part of the energy back to the radar; the radar receiver intercepts and processes the reflected signal to extract relevant information about the target, such as target distance, angle, speed, and other target identification information. To achieve airspace search or target tracking, antenna scanning methods such as mechanical scanning and electronic scanning can be adopted according to the type of radar antenna.

[0003] To effectively simulate the radar scanning method, generally, in a laboratory, a servo, turntable and other mechanical rotation mechanisms are used to drive the antenna to rotate, so as to achieve radar scanning.

[0004] However, in the existing mechanical scanning method, a turntable and other mechanical scanning devices must be used to achieve it. Ground treatment, assembly of the turntable mechanical structure are required, and turntable shielding treatment is needed to prevent turntable radiation or its influence on the electromagnetic field. Summary of the Invention

[0005] This application proposes a method and device for static simulation of radar dynamic scanning signals, and realizes this test scheme through a signal simulation method, solving the problems of inconvenient operation and disturbance of existing test turntables.

[0006] An embodiment of this application provides a method for static simulation of radar dynamic scanning signals, including the following steps:

[0007] Determine the pulse width according to the reflection duration of the radar scanning target;

[0008] Determine the pulse period according to the time taken for the radar to scan one week;

[0009] According to the pulse width and pulse period, use a stationary antenna to send a radio frequency pulse signal to the target.

[0010] Among them, the reflection duration of the radar scanning target is the time length when the reflected signal of the target exceeds a set threshold; the pulse width is the maximum value of the reflection duration of the radar scanning target.

[0011] Preferably, the amplitude of the radio frequency pulse signal is weighted and controlled according to the law of the change of the radar scanning radiation field intensity with time.

[0012] More preferably, horizontal polarization and vertical polarization electromagnetic pulses are respectively generated by a radio frequency signal source and sent through the stationary antenna.

[0013] Further preferably, weighted processing is performed on the horizontally polarized electromagnetic pulse and the vertically polarized electromagnetic pulse respectively.

[0014] Preferably, the amplitude of the radio frequency pulse signal is weighted using the radiation pattern of the radar as the weighting function.

[0015] Preferably, the amplitude of the radio frequency pulse signal is weighted using the integral of the radar radiation pattern within the reflection duration range of the radar scanning target as the weighting function.

[0016] The present application also provides a static simulation device for radar dynamic scanning signals, which is used to implement the method described in any embodiment of the present application. The device includes: an arbitrary function generator, a radio frequency signal source, a power amplifier, a transmitting antenna, a receiving antenna, and a real-time spectrum analyzer.

[0017] The arbitrary function generator outputs a pulse signal to modulate the output of the radio frequency signal source, generating an electromagnetic pulse signal, which is radiated by the transmitting antenna after being amplified by the power amplifier. The electromagnetic pulse signal is received by the receiving antenna, and the waveform of the received signal is displayed by the real-time spectrum analyzer.

[0018] Further, a polarization separator is further included; the radio frequency signal is divided into horizontally polarized and vertically polarized radio frequency signals by the polarization separator. For the horizontally polarized and vertically polarized radio frequency signals, pulse signals output by the arbitrary function generator are respectively used for modulation.

[0019] Preferably, the output pulse amplitude of the horizontally polarized radio frequency signal is weighted for the rectangular pulse by constructing a weighting function with the horizontally polarized field radiation pattern. The output pulse amplitude of the vertically polarized radio frequency signal is weighted for the rectangular pulse by constructing a weighting function with the vertically polarized field radiation pattern.

[0020] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects:

[0021] Without using a turntable, in order to implement radar scanning, this test is realized by simulating signal characteristics, thereby replacing the turntable. Through the method and device of the present application, the use of a turntable can be avoided, saving space and cost, improving test stability, and reducing electromagnetic crosstalk. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0023] Figure 1 It is a schematic diagram of the composition of a radar scanning system;

[0024] Figure 2Flowchart of an embodiment of the static simulation method for radar dynamic scanning signals in this application;

[0025] Figure 3 Schematic diagram of constructing a weight function using a radiation pattern;

[0026] Figure 4 Schematic diagram of constructing a weight function by convolving a radiation pattern with a pulse signal;

[0027] Figure 5 Embodiment of the static simulation device for radar dynamic scanning signals in this application;

[0028] Figure 6 Another embodiment of the static simulation device for radar dynamic scanning signals in this application. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0030] The following details the technical solutions provided by each embodiment of this application in conjunction with the drawings.

[0031] Figure 1 Schematic diagram of the composition of a radar scanning system.

[0032] As Figure 1 shown, for simulating the radar scanning mode, generally in a laboratory, a servo, turntable and other mechanical rotation mechanisms are used to drive the antenna to rotate, or the mechanical rotation of the device under test is used to achieve radar scanning. However, the spin of the object under test is equivalent to the radar rotating around the circumference of the object under test, which is not the same as the spin of the radar.

[0033] Figure 2 Flowchart of an embodiment of the static simulation method for radar dynamic scanning signals in this application.

[0034] The embodiments of this application provide a static simulation method for radar dynamic scanning signals, including the following steps:

[0035] Step 21: Determine the pulse width according to the reflection duration of the radar scanning target;

[0036] Among them, the reflection duration tr of the radar scanning target is the time length during which the reflected signal of the target exceeds a set threshold; the pulse width is the maximum value tr of the reflection duration of the radar scanning target max .

[0037] Step 22: Determine the pulse period according to the time taken for the radar to scan one week.

[0038] It can be understood that for the time T taken for the radar to scan one week, when scanning one week is 360°, all points of the radar pattern sweep over the target; when the radar scans one week as θ < 360°, then all points within the range of ±θ / 2 of the radar pattern sweep over the target.

[0039] Step 23: According to the pulse width and pulse period, use a stationary antenna to send a radio frequency pulse signal to the target.

[0040] For example, according to the radar emission signal characteristics, the radar emission signal is generally a radio frequency signal output in a pulse modulation mode. For example, the carrier frequency is 3 GHz, and the modulation mode is pulse modulation with a repetition frequency of 1 kHz and a duty cycle of 10%. When the radar rotates, the time it irradiates the object within one rotation corresponds to a part of the one-week time. Therefore, the radar rotation time and the irradiation object scanning time can be regarded as a modulation mode. For example, if the radar rotation speed is 1 revolution per second and the irradiation time of the irradiation object is 100 ms, by re-modulating the transmitted radio frequency pulse signal in a modulation mode with a 1S period and a 10% duty cycle, the radar rotation simulation effect can be achieved.

[0041] In step 23, preferably, the amplitude of the radio frequency pulse signal is weighted and controlled according to the law of the radar scanning radiation field intensity changing with time.

[0042] It should be noted that the law of the radar scanning radiation field intensity changing with time can be characterized by the reflected field intensity received at the transmitting antenna. Therefore, by measuring the reflected field intensity through a radar scanning experiment, a weight function can be constructed, which requires mechanical control of the radar rotation to obtain prior data.

[0043] In addition, the radiation pulse intensity can also be weighted according to the radar radiation pattern. Those skilled in the art can understand that when the radar rotates along the horizontal plane (such as the H plane), the horizontal pattern is used to construct the weight function; when the radar rotates along the vertical plane (such as the E plane), the vertical pattern is used to construct the weight function.

[0044] At the same time, by using different polarization transmitting antennas, different polarization scanning modes of the radar can be realized. In step 23, further, horizontal polarization and vertical polarization electromagnetic pulses are respectively generated by a radio frequency signal source and sent through the stationary antenna. Further preferably, the horizontal polarization electromagnetic pulse and the vertical polarization electromagnetic pulse are respectively weighted.

[0045] Step 24: The monitoring end uses a real-time spectrum analyzer, an attenuator, a receiving antenna, etc. to receive signals. Through the time-domain waveform monitoring of the spectrum analyzer, the analysis of modulation signal indexes can be realized.

[0046] Figure 3 Schematic diagram for constructing a weight function using a radiation pattern

[0047] As an example, the radiation pattern of a radar is used as a weight function to weight the amplitude of the RF pulse signal

[0048] The amplitude of the RF pulse signal is expressed as

[0049] P(t) = A × G(t)

[0050] Where

[0051]

[0052] A is the maximum radiation intensity

[0053] The radar radiation pattern is expressed as f(θ), -π < θ < π. When the period of the radar scanning one week is T, the angular velocity of scanning is ω = 2π / T

[0054] The pulse amplitude weighted by the radiation pattern function is

[0055] P(t) = A × f(2πt / T) × G(t)

[0056] Figure 4 Schematic diagram for constructing a weight function by convolving a radiation pattern with a pulse signal

[0057] As another example of the present application, the integral of the radar radiation pattern within the reflection duration range of the radar scanning the target is used as a weight function to weight the amplitude of the RF pulse signal

[0058] At this time, when the rotating radar radiation pattern enters the reflection duration range of the target, that is, the range of the scanning angle is When, the pulse amplitude weighted by constructing a weight function using the radiation pattern function is

[0059]

[0060] Figure 5 Embodiment of the static simulation device for the radar dynamic scanning signal of the present application

[0061] The present application also provides a static simulation device for radar dynamic scanning signals, which is used to implement the method described in any embodiment of the present application. The device includes: an arbitrary function generator 51, an RF signal source 52 (and a modulator 57), a power amplifier 53, a transmitting antenna 54, a receiving antenna 55, an attenuator 58, and a real-time spectrum analyzer 56

[0062] The output pulse signal of the arbitrary function generator modulates the output of the RF signal source to generate an electromagnetic pulse signal, which is amplified by a power amplifier and radiated by a transmitting antenna. After being reflected by the target object, the electromagnetic pulse signal is received by a receiving antenna, and the waveform of the received signal is displayed by a real-time spectrum analyzer.

[0063] For example, connect a 1-18G transmitting antenna (HF906) to a RF signal generator (SMB100A). The RF signal generator has a built-in modulator. By setting the RF pulse modulation method to 1 kHz and a duty cycle of 50%, a RF field is formed through the transmitting antenna. Using a receiving antenna (HF906) and connecting it to a real-time spectrum analyzer (FSW43), the amplitude of the RF signal and the information of the modulation signal can be obtained. The set parameters of SMB100A are: carrier frequency 3 GHz, pulse modulation set to a period of 1 ms, pulse width 100 us, and trigger mode set to external pulse gating trigger mode.

[0064] When simulating the radar scanning mode, use an arbitrary function generator (8116A) as an external modulation source to generate a radiation pulse envelope. The frequency is set to the radar scanning frequency, and the dwell time is set to the dwell time of the radar main beam. Connect it to the trigger signal input port of the RF signal generator (SMB100A) through a RF cable. The setting method of 8116A is: Frq: 1 Hz; FTY: 10 ms; Amp: 2 V; OFS: 1 V. It is set to a pulse waveform.

[0065] Set the modulation mode of the SMB100A signal source, the power amplifier output, and the RF / modulation setting of the signal source to generate the received field strength. Set the modulation mode of the SMB100A signal source to the external trigger mode: Trigger Mode: Extern Gated. When 8116A does not output and there is no external trigger level at the signal source, there is no output, and then there is no field strength output at the transmitting antenna; when 8116A outputs according to the specifications, then SMB100A outputs, and there is field strength output at the transmitting antenna.

[0066] Figure 6 This is another embodiment of the radar dynamic scanning signal static simulation device of the present application.

[0067] Furthermore, it further includes a polarization separator 61; the RF signal is divided into horizontally polarized and vertically polarized RF signals by the polarization separator. For the horizontally polarized and vertically polarized RF signals, pulse signals output by an arbitrary function generator are respectively used for modulation. After amplification, the horizontally polarized feeding signal and the vertically polarized feeding signal reach the transmitting antenna through a polarization multiplexing device 62.

[0068] At this time, the output pulse amplitude of the horizontally polarized radio frequency signal is obtained by weighting a rectangular pulse with a weight function constructed from the horizontally polarized field pattern. The output pulse amplitude of the vertically polarized radio frequency signal is obtained by weighting a rectangular pulse with a weight function constructed from the vertically polarized field pattern.

[0069] It should be noted that Figure 4 merely as a schematic diagram of another embodiment of the present application, in a specific experimental device, the polarization separator, modulator, amplifier, and polarization multiplexing device can be designed as an integrated waveguide device or an integrated microstrip device.

[0070] Compared with the existing darkroom turntable method, the present invention eliminates the mechanical device, reduces the test space, and avoids the disturbance caused by the operation of mechanical equipment. This method can simulate and implement signal characteristics such as amplitude, pulse width, repetition frequency, and polarization when the main beam of the radar irradiates, and can also simulate the periodic irradiation time of the radar rotation.

[0071] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0072] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A static simulation method for radar dynamic scanning signals, characterized in that, comprising the following steps, determining the pulse width according to the reflection duration of the radar scanning the target; determining the pulse period according to the duration of the radar scanning one week; weighting the amplitude of the radio frequency pulse signal with the radar pattern as the weight function, or weighting the amplitude of the radio frequency pulse signal with the integral of the radar pattern within the reflection duration of the radar scanning the target as the weight function; transmitting a radio frequency pulse signal to the target using a stationary antenna according to the pulse width and the pulse period; wherein the reflection duration of the radar scanning the target is the time length when the reflected signal of the target exceeds a set threshold; the pulse width is the maximum value of the reflection duration of the radar scanning the target.

2. The method for static simulation of radar dynamic scanning signals according to claim 1, wherein weighting control is performed on the amplitude of the radio frequency pulse signal according to the law of the change of the radar scanning radiation field intensity with time.

3. The method for static simulation of radar dynamic scanning signals according to claim 1, wherein horizontal polarization and vertical polarization electromagnetic pulses are respectively generated by a radio frequency signal source and transmitted through the stationary antenna.

4. The method for static simulation of radar dynamic scanning signals according to claim 3, wherein weighting processing is respectively performed on the horizontal polarization electromagnetic pulse and the vertical polarization electromagnetic pulse.

5. The method for static simulation of radar dynamic scanning signals according to claim 1, wherein the simulated radar rotates along the horizontal plane, and a weight function is constructed using the horizontal pattern of the radar.

6. The method for static simulation of radar dynamic scanning signals according to claim 1, wherein the simulated radar rotates along the vertical plane, and a weight function is constructed using the vertical pattern of the radar.

7. A static simulation device for radar dynamic scanning signals, which is used to implement the method described in any one of claims 1 to 6, and is characterized in that including: an arbitrary function generator, a radio frequency signal source, a power amplifier, a transmitting antenna, a receiving antenna, and a real-time spectrum analyzer; the arbitrary function generator outputs a pulse signal to modulate the output of the radio frequency signal source to generate an electromagnetic pulse signal, which is amplified by the power amplifier and radiated by the transmitting antenna; the electromagnetic pulse signal is received through the receiving antenna, and the waveform of the received signal is displayed through the real-time spectrum analyzer.

8. The device for static simulation of radar dynamic scanning signals according to claim 7, wherein a polarization separator is further included; the radio frequency signal is divided into horizontal polarization and vertical polarization radio frequency signals by the polarization separator; the horizontal polarization and vertical polarization radio frequency signals are respectively modulated by using the pulse signal output by the arbitrary function generator.

9. The device for static simulation of radar dynamic scanning signals according to claim 7, wherein the output pulse amplitude of the horizontal polarization radio frequency signal is to weight a rectangular pulse by constructing a weight function with the horizontal polarization field pattern; the output pulse amplitude of the vertical polarization radio frequency signal is to weight a rectangular pulse by constructing a weight function with the vertical polarization field pattern.

Images