Accurate measurement radar wireless calibration device

Abstract

The utility model relates to an accurate measurement radar wireless calibration device which comprises a monolithic radio frequency integrated circuit, a parameter configuration circuit, a radio frequency amplification circuit, a pulse shaping and level switching circuit, an accurate measurement radar range finder, a directional gain antenna, a radar synchronization pulse recovery circuit, a radio frequency attenuator, a radar signal source, a pyramid horn antenna and a power supply module. The device is ingenious in design, convenient and practical, radar synchronizing signals are transmitted in a wireless mode to trigger a radio frequency signal source, simulation radar echo signals are generated, a radar can stably track measuring points, a radar transmitter does not need to be started, meanwhile, more measuring points can be conveniently increased, and the measuring accuracy is improved. The influence of ground clutters around the corner reflector on measurement data is avoided, the calibration precision of the accurate measurement radar is remarkably improved, and compared with the prior art, the method has good market prospects and development space.

Description

TECHNICAL FIELD

[0001] The utility model relates to radar calibration technical field, concretely relates to a kind of precision radar wireless calibration device. BACKGROUND

[0002] The radar of precision tracking measurement must be accurately calibrated before measurement task.The existing radar usually adopts tracking corner reflector mode, radio frequency signal retransmission mode and wired calibration mode for calibration.Corner reflector calibration mode is easily disturbed by the interference of corner reflector surrounding ground object reflection clutter, radar tracking is unstable, calibration accuracy is not high, and large-scale surveying and mapping standard infrastructure needs to be established;Radio frequency signal retransmission mode needs radar transmitter to be always powered on, and needs to avoid ground echo interference;Wired calibration mode needs wired transmission of radar synchronization signal, and cannot be arbitrarily selected point due to cable length and line restriction, and wiring is troublesome, and the required preparation time is longer, which cannot meet the requirement of flexible arrangement of field radar.

[0003] How to design a kind of precision radar wireless calibration device with ingenious design, convenient and practical, which transmits radar synchronization signal to trigger radio frequency signal source by wireless mode to generate analog radar echo signal, so that radar can stably track measurement point, does not need radar transmitter to be powered on, and at the same time, more measurement points can be conveniently added, which avoids the influence of corner reflector surrounding ground clutter on measurement data, and significantly improves the calibration accuracy of precision radar is the problem to be solved at present. UTILITY MODEL CONTENTS

[0004] In order to solve the technical problems in the process of accurate calibration of existing radar, such as corner reflector calibration mode being easily disturbed by the interference of corner reflector surrounding ground object reflection clutter, radar tracking being unstable, calibration accuracy being not high, and large-scale surveying and mapping standard infrastructure needing to be established, radio frequency signal retransmission mode needing radar transmitter to be always powered on, and needing to avoid ground echo interference, wired calibration mode needing wired transmission of radar synchronization signal, and being unable to be arbitrarily selected point due to cable length and line restriction, and wiring being troublesome, and the required preparation time being longer, which cannot meet the requirement of flexible arrangement of field radar, the utility model provides a kind of precision radar wireless calibration device, to realize ingenious design, convenient and practical, which transmits radar synchronization signal to trigger radio frequency signal source by wireless mode to generate analog radar echo signal, so that radar can stably track measurement point, does not need radar transmitter to be powered on, and at the same time, more measurement points can be conveniently added, which avoids the influence of corner reflector surrounding ground clutter on measurement data, and significantly improves the calibration accuracy of precision radar.

[0005] The utility model discloses a technical scheme adopted for solving the above technical problem is: a kind of fine survey radar wireless calibration device, including single-chip radio frequency integrated circuit, parameter configuration circuit, radio frequency amplification circuit, pulse shaping and level conversion circuit, fine survey radar range finder, directional gain antenna, radar synchronous pulse recovery circuit, radio frequency attenuator, radar signal source, corner horn antenna and power module, wherein, single-chip radio frequency integrated circuit, parameter configuration circuit, radio frequency amplification circuit, pulse shaping and level conversion circuit, fine survey radar range finder, directional gain antenna constitute transmitting end total circuit;Single-chip radio frequency integrated circuit, parameter configuration circuit, radar synchronous pulse recovery circuit, radio frequency attenuator, radar signal source, directional gain antenna, corner horn antenna constitute receiving end total circuit, and the wireless transmission of radar synchronous signal is completed by single-chip radio frequency integrated circuit cooperation pulse shaping and level conversion circuit, radar synchronous pulse recovery circuit, realize radar accurate calibration.

[0006] As the further optimization scheme of the above-mentioned fine survey radar wireless calibration device, in the transmitting end total circuit, the synchronization signal sent out by the fine survey radar range finder is shaped into a square wave by the pulse shaping and level conversion circuit, and the level is converted into a low voltage level and sent into the digital modulation end of the single-chip radio frequency integrated circuit radio frequency module; the single-chip radio frequency integrated circuit radio frequency module completes radio frequency modulation and power amplification on the input signal, and feeds the signal to the transmitting antenna end of the directional gain antenna after further power amplification by the radio frequency amplification circuit; the directional gain antenna sends the signal carrier energy in space to the receiving antenna end of the directional gain antenna.

[0007] As the further optimization scheme of the above-mentioned fine survey radar wireless calibration device, in the receiving end total circuit, after the receiving antenna end of the directional gain antenna receives the signal carrier energy, the high-frequency signal is first attenuated to further suppress the spatial interference signal energy, and is sent into the high-frequency receiving end of the single-chip radio frequency integrated circuit radio frequency module; the single-chip radio frequency integrated circuit radio frequency module completes radio frequency filter amplification and demodulation on the received signal, and sends the obtained synchronization signal into the radar synchronous pulse recovery circuit to recover the original waveform of the radar synchronization signal; the synchronization signal triggers the radar signal source, and the microwave signal is transmitted and received by the radar to complete the radar calibration task.

[0008] As the further optimization scheme of the above-mentioned fine survey radar wireless calibration device, in the transmitting end total circuit and the receiving end total circuit, the power module supplies power to the single-chip radio frequency integrated circuit, and the parameter configuration circuit completes initialization and control register configuration of the single-chip radio frequency integrated circuit radio frequency module.

[0009] As the further optimization scheme of the above-mentioned fine survey radar wireless calibration device, the single-chip radio frequency integrated circuit adopts SI4432 single-chip narrowband integrated chip circuit module, the working frequency band is the international ISM frequency band, and the direct working mode is adopted.

[0010] As a further optimization scheme of the above-mentioned fine measurement radar wireless calibration device, the radar signal source adopts a radar special analog echo signal source with high frequency stability, and the frequency range covers 900MHz-16GHz.

[0011] As a further optimization scheme of the above-mentioned fine measurement radar wireless calibration device, the directional gain antenna adopts a VHF / UHF band Yagi directional antenna.

[0012] Compared with the prior art, the fine measurement radar wireless calibration device has the following beneficial effects:

[0013] Firstly, the fine measurement radar wireless calibration device comprises a single-chip radio frequency integrated circuit, a parameter configuration circuit, a radio frequency amplification circuit, a pulse shaping and level conversion circuit, a fine measurement radar range finder, a directional gain antenna, a radar synchronization pulse recovery circuit, a radio frequency attenuator, a radar signal source, a corner horn antenna and a power module.

[0014] Secondly, the fine measurement radar wireless calibration device transmits radar synchronization signals in a wireless manner to trigger the radio frequency signal source, generates an analog radar echo signal, so that the radar can stably track a measurement point, does not need to be started by a radar transmitter, and is convenient for increasing more measurement points, avoids the influence of ground clutter around the corner reflector on measurement data, and significantly improves the calibration accuracy of the fine measurement radar.

[0015] Thirdly, the fine measurement radar wireless calibration device does not need to be started by a radar transmitter, is flexible to operate, convenient to carry, fast and accurate to calibrate, and can meet the requirements of fast and accurate calibration of a measurement radar. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a total circuit principle block diagram of a transmitting end of the fine measurement radar wireless calibration device;

[0017] Figure 2 The figure is a total circuit principle block diagram of a receiving end of the fine measurement radar wireless calibration device;

[0018] Figure 3 The figure is a physical map of a single-chip radio frequency integrated circuit chip circuit;

[0019] Figure 4 The figure is a signal shaping circuit diagram of the transmitting end;

[0020] Figure 5 The figure is a signal shaping waveform diagram of the transmitting end;

[0021] Figure 6 The figure is a signal restoration circuit diagram of the receiving end;

[0022] Figure 7 The figure is a signal waveform restoration diagram of the receiving end;

[0023] Figure 8 The figure is a physical diagram of a radar signal source;

[0024] Figure 9 The figure is a physical diagram of a corner horn antenna;

[0025] Figure 10 The figure is a directional diagram of a corner horn antenna;

[0026] Figure 11 The figure is a physical diagram of a directional gain antenna;

[0027] Figure 12 The figure is a directional diagram of a Yagi antenna. DETAILED DESCRIPTION

[0028] The specific embodiments of the utility model will be further explained in detail below in combination with the drawings.

[0029] As shown in Figure 1 , 2 A fine measurement radar wireless calibration device, comprising a single-chip radio frequency integrated circuit, a parameter configuration circuit, a radio frequency amplification circuit, a pulse shaping and level conversion circuit, a fine measurement radar range finder, a directional gain antenna, a radar synchronization pulse recovery circuit, a radio frequency attenuator, a radar signal source, a corner horn antenna and a power module, wherein the single-chip radio frequency integrated circuit, the parameter configuration circuit, the radio frequency amplification circuit, the pulse shaping and level conversion circuit, the fine measurement radar range finder and the directional gain antenna constitute a transmitting end total circuit; the single-chip radio frequency integrated circuit, the parameter configuration circuit, the radar synchronization pulse recovery circuit, the radio frequency attenuator, the radar signal source, the directional gain antenna and the corner horn antenna constitute a receiving end total circuit, and the wireless transmission of a radar synchronization signal is completed through the single-chip radio frequency integrated circuit in cooperation with the pulse shaping and level conversion circuit and the radar synchronization pulse recovery circuit, so that accurate radar calibration is realized.

[0030] In the transmitting end total circuit, the synchronization signal sent by the fine measurement radar range finder is shaped into a square wave by the pulse shaping and level conversion circuit, and is converted into a low-voltage level and sent to the digital modulation end of the radio frequency module of the single-chip radio frequency integrated circuit; the radio frequency module of the single-chip radio frequency integrated circuit completes radio frequency modulation and power amplification of the input signal, and feeds the signal to the transmitting antenna end of the directional gain antenna after further power amplification by the radio frequency amplification circuit; the directional gain antenna sends the signal carrier energy in space to the receiving antenna end of the directional gain antenna.

[0031] The receiving antenna of the directional gain antenna receives the signal carrier energy, attenuates the high frequency signal, further suppresses the space interference signal energy, and sends into the high frequency receiving end of the single-chip radio frequency integrated circuit radio frequency module; the single-chip radio frequency integrated circuit radio frequency module completes the radio frequency filtering amplification and demodulation of the received signal, and sends the obtained synchronization signal into the radar synchronization pulse recovery circuit to recover the original waveform of the radar synchronization signal; the synchronization signal triggers the radar signal source, transmits the microwave signal, and is received by the radar to complete the radar calibration task.

[0032] In the transmitting end overall circuit and the receiving end overall circuit, the power module supplies power to the single-chip radio frequency integrated circuit, and the parameter configuration circuit completes the initialization and control register configuration of the single-chip radio frequency integrated circuit radio frequency module.

[0033] As shown in Figure 3 , the single-chip radio frequency integrated circuit adopts the SI4432 single-chip narrow-band integrated chip circuit module, the working frequency band is the international ISM frequency band, and the direct working mode is adopted.

[0034] The radar signal source adopts a radar special analog echo signal source with high frequency stability, and the frequency range covers 900MHz-16GHz.

[0035] The directional gain antenna adopts the VHF / UHF band Yagi directional antenna.

[0036] In actual application, a single wireless radio frequency chip is used as a radio frequency transceiver chip; FSK modulation technology is adopted. A SI4432 single wireless radio frequency chip is used as a radio frequency transceiver chip. The SI4432 radio frequency chip is a UHF single-chip radio frequency integrated circuit, which works in the international ISM frequency band. It adopts FSK modulation and demodulation technology, has strong anti-interference ability, and adopts PLL frequency synthesis technology, and has good frequency stability. The radio frequency chip has a Direct working mode, and has narrow-band transmission capability. The bandwidth range of the band-pass filter is 2.6KHz-620.7KHz, and has 57 programmable adjustments. The frequency offset range is ±0.625KHz-±320KHz, the step frequency is 625Hz, the output power range is 0-20dBm, which can be adjusted, the maximum receiving sensitivity is-105dBm, and the working voltage is between +2.2-3.6V. The receiving and transmitting functions are integrated on one chip, and the consistency is good. The chip requires fewer peripheral devices, only needs to be externally connected with a crystal and several resistance, capacitance and inductance elements, and can constitute a complete radio frequency generator.

[0037] As shown in Figure 4 , 5As shown, the pulse shaping circuit works: because the pulse waveform to be transmitted in this project is a square wave, the time of the transmission signal carrier is equal to 1, the signal spectrum is symmetrical, and the received signal is optimal. Therefore, the radar pulse waveform is shaped into a square wave at the transmitting end, without affecting the front edge arrival time of the synchronization signal; at the receiving end, the signal is restored to the radar synchronization signal pulse width. Here, the 54122 monostable multivibrator circuit of TTL level is adopted. The 54122 chip is a repeatable monostable multivibrator.

[0038] As shown in the truth table, when clear is high, B1 has a pulse rising edge, B2 is high, and A1 and A2 are low, the 8-pin output of the 54122 chip is a monostable positive pulse, and the output pulse waveform is as shown in Figure 5 .

[0039] As shown in Figure 6 , 7 , the waveform recovery circuit at the receiving end is basically the same as the waveform shaping circuit at the transmitting end, except that the shaped waveform pulse width is different, and the recovered waveform is as shown in Figure 7 . The waveform pulse width is set as follows:

[0040] Signal delay capacitance value calculation (C ext <1000 pF):

[0041] When C ext = 360 pF, the output waveform pulse width t w = 1.7μs.

[0042] Through the above analysis and calculation and actual test, it is shown that the waveform shaping circuit has well completed the transmission signal waveform transformation work, and the synchronization pulse signal is completely restored at the receiving end.

[0043] As shown in Figure 8 , the radio frequency signal source adopts a radar special analog echo signal source with high frequency stability. The DH series radar comprehensive tester is adopted in this project. The series radar comprehensive tester can be externally triggered pulse modulated, adopts microwave frequency division phase-locked technology, and has a frequency stability of 5×10 -6 , a frequency range covering 900MHz-16GHz, and meets the radar calibration requirements.

[0044] As shown in Figure 9 , 10As shown, the radio frequency signal feed antenna adopts a standard corner horn antenna. The corner horn antenna has the characteristics of good matching and high efficiency. According to the radar tracking principle, the radar must track the top cut point of the horn antenna pattern. When the horn antenna mouth surface is directly opposite the radar antenna, the radar tracking point is the maximum value of the horn antenna pattern top point, that is, the radar antenna center is directly opposite the horn antenna center, which ensures that the radar antenna is accurately calibrated in the direction. Therefore, when placing the horn antenna, it is necessary to ensure that the horn antenna mouth surface is directly opposite the radar antenna.

[0045] As shown in Figure 11 , 12 , the Yagi directional antenna has the advantages of high gain, light structure, easy erection and low price, and is particularly suitable for point-to-point communication. The more the number of units of the Yagi directional antenna, the higher the gain, and usually 6-12 units are used, and the gain can reach 10-16dB. The VHF / UHF band Yagi directional antenna used in the project is model TDJ435-16 / 12YG, which is suitable for 430-440MHz U-band radio. Characteristics: TDJ435-16 / 12YG series aluminum alloy Yagi directional antenna, high gain, high front-to-back ratio, strong anti-interference ability. The antenna has simple and solid structure, and is easy to erect. The physical diagram is as shown in Figure 11 . The Yagi antenna pattern is as shown in Figure 12 , in which the Yagi antenna lobe width, the horizontal plane lobe width is 28°, and the vertical plane lobe width is 23°.

[0046] The utility model discloses design ingenious, convenient and practical, adopt wireless mode to convey radar synchronous signal trigger radio frequency signal source, produce analog radar echo signal, so that radar can stable tracking survey point, need not radar transmitter start, convenient simultaneously increase more survey point, avoid the influence of ground clutter around the corner reflector on the measurement data, significantly improve the calibration accuracy of precision radar, solve the technical problems that the corner reflector calibration method in the existing radar accurate calibration process is easily disturbed by the ground reflection clutter around the corner reflector, the radar tracking is unstable, the calibration accuracy is not high, and large-scale geodetic surveying and mapping infrastructure needs to be established, the radio frequency signal forwarding mode needs radar transmitter to always start high power, and needs to avoid the influence of ground echo interference, the wired calibration mode needs to transmit radar synchronous signal by wire, and the point position cannot be selected arbitrarily due to the limitation of cable length and line, and wiring is troublesome, and the required preparation time is relatively long, which cannot meet the requirements of field radar mobile flexible arrangement, and the like. For the existing technology, it has good market prospect and development space.

[0047] The preferred specific embodiments and examples of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments and examples, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the concept of the utility model.

Claims

1. A fine measurement radar wireless calibration device, characterized by: The application relates to a radar calibration device, which comprises a single-chip radio frequency integrated circuit, a parameter configuration circuit, a radio frequency amplification circuit, a pulse shaping and level conversion circuit, a precision radar range finder, a directional gain antenna, a radar synchronous pulse recovery circuit, a radio frequency attenuator, a radar signal source, a corner horn antenna and a power module.

2. A fine measurement radar wireless calibration device as claimed in claim 1, characterized in that: In the transmitting end total circuit, the synchronous signal sent by the precision radar range finder is shaped into a square wave by the pulse shaping and level conversion circuit and is converted into a low voltage level to be sent into a digital modulation end of a radio frequency module of the single-chip radio frequency integrated circuit; the radio frequency module of the single-chip radio frequency integrated circuit completes radio frequency modulation and power amplification of the input signal, and feeds the signal into the radio frequency amplification circuit for further power amplification and then feeds the signal into a transmitting antenna end of the directional gain antenna. The directional gain antenna sends the signal carrier energy in space to a receiving antenna end of the directional gain antenna.

3. A fine measurement radar wireless calibration device as claimed in claim 1, characterized in that: In the receiving end total circuit, after the receiving antenna end of the directional gain antenna receives the signal carrier energy, the high-frequency signal is attenuated to further suppress the energy of the space interference signal and is sent into a high-frequency receiving end of the radio frequency module of the single-chip radio frequency integrated circuit; the radio frequency module of the single-chip radio frequency integrated circuit completes radio frequency filter amplification and demodulation of the received signal, and sends the obtained synchronous signal into the radar synchronous pulse recovery circuit to recover the original waveform of the radar synchronous signal; the synchronous signal triggers the radar signal source to emit a microwave signal which is received by the radar to complete the radar calibration task.

4. A fine measurement radar wireless calibration device as claimed in any one of claims 1 to 3, characterized in that: In the transmitting end total circuit and the receiving end total circuit, the power module supplies power to the single-chip radio frequency integrated circuit, and the parameter configuration circuit completes initialization and control register configuration of the radio frequency module of the single-chip radio frequency integrated circuit.

5. A fine measurement radar wireless calibration device as claimed in claim 4, characterized in that: The single-chip radio frequency integrated circuit adopts an SI4432 single-chip narrow-band integrated chip circuit module, adopts a direct working mode and has a working frequency band of an international ISM frequency band.

6. A fine measurement radar wireless calibration device as claimed in claim 4, characterized in that: The radar signal source adopts a radar special analog echo signal source with high frequency stability and covers a frequency range of 900MHz-16GHz.

7. A fine measurement radar wireless calibration device as claimed in claim 4, characterized in that: The directional gain antenna adopts a VHF / UHF wave band Yagi directional antenna.

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