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Frequency modulated continuous wave laser radar beat frequency signal measuring method and system

A frequency modulation continuous wave and laser signal technology, applied in the field of instruments and meters, can solve the problems of high cost and low measurement speed, and achieve the effects of low cost, high real-time performance and strong versatility

Pending Publication Date: 2022-02-18
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of high cost and low measurement speed in the prior art, the present invention proposes a method and system for measuring beat frequency signals of frequency modulated continuous wave (FMCW) light radar

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  • Frequency modulated continuous wave laser radar beat frequency signal measuring method and system
  • Frequency modulated continuous wave laser radar beat frequency signal measuring method and system
  • Frequency modulated continuous wave laser radar beat frequency signal measuring method and system

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Embodiment 1

[0053] combine as Figure 4 Shown concrete implementation circuit structure, a kind of frequency modulation continuous wave excitation (FMCW) light radar beat frequency signal measurement system of the present invention each component relevant parameter setting is as follows: continuous laser device central wavelength is 1550nm; Avalanche photodiode APD receiving central wavelength is 1550nm; The main component chip of the transimpedance amplifier is LTC6268, the transimpedance gain is 150K; the cutoff frequency of the low-pass filter is 20MHz, and has an additional gain of 2.4 times, the main chip is LTC6252; the main chip of the mixer is LT5560, and the main chip of the high-speed comparator It is TLV3501A-Q1, the reference voltage is 1V; the time-to-digital conversion chip model is TDC-GPX2.

[0054] Such as figure 1 As shown, the present embodiment provides a frequency-modulated continuous wave (FMCW) light radar beat frequency signal measurement system, including an aval...

Embodiment 2

[0058] combine as Figure 5 As shown in the specific implementation circuit structure, the present invention proposes a frequency-modulated continuous wave (FMCW) light radar beat frequency signal measurement system. The main component chip of the transimpedance amplifier is LTC6268, the transimpedance gain is 150K; the cutoff frequency of the low-pass filter is 20MHz, and has an additional gain of 2.4 times, the main chip is LTC6252; the main chip of the mixer is LT5560, and the main chip of the high-speed comparator It is TLV3501A-Q1, the reference voltage is 1V; the time-to-digital conversion chip model is TDC-GPX2.

[0059] Such as figure 2 As shown, the present embodiment provides a frequency-modulated continuous wave (FMCW) light radar beat frequency signal measurement system, including an avalanche photodiode 1, a transimpedance amplifier 2, a continuous laser 3, a laser emitting circuit 4, a signal processing circuit 5, Time-to-digital converter 6, laser emission dr...

Embodiment 3

[0063] Such as figure 1 As shown, the present embodiment provides a method for measuring frequency modulated continuous wave (FMCW) light radar beat frequency signal, which specifically includes the following steps:

[0064] step 1:

[0065] The transmission signal control circuit generates a linear frequency modulation signal f1 and transmits it to the laser modulation circuit and signal processing circuit. The laser modulation circuit drives the continuous laser to generate a frequency modulation continuous wave laser signal (center wavelength 1550nm), and the avalanche photodiode receives the frequency modulation continuous wave laser signal The photocurrent is generated after the signal, and the transimpedance amplifier U1.LTC6268-10 converts the photocurrent generated by the avalanche photodiode into a voltage signal f2, and at the same time amplifies it and sends it to the signal processing circuit. The signal processing circuit processes the voltage signals f1 and f2 A...

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Abstract

The invention discloses a frequency modulated continuous wave laser radar beat frequency signal measuring method and system, and belongs to the technical field of instruments and meters. The system is composed of a laser emission circuit, a signal receiving and converting circuit and a time-to-digital converter. The laser emission circuit drives a continuous laser to emit frequency-modulated continuous wave laser. A frequency mixer carries out frequency mixing on voltage signals f1 and f2 to obtain a frequency mixing signal S1, and an ALPF filters out high-frequency components of the signal S1 to obtain a low-frequency signal S2. An HSC converts the signal into a square wave signal S3, and a DIV reduces the frequency of the signal S3 to obtain a low-frequency signal S4 with a proper frequency. An SC converts the signal S4 into two paths of pulse signals S5a and S5b, namely signals Start and Stop sent to a TDC, the pulse time interval of the S5a and the S5b is a period of the signal S4, and the data output of the TDC is the period of the signal S4. According to the beat frequency signal measuring circuit applying the method, high-speed measurement of FMCW beat frequency signals can be achieved only through the circuit, the system is simple and easy to achieve, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of instruments and meters, and in particular relates to a method and system for measuring beat frequency signals of a frequency-modulated continuous wave laser radar. Background technique [0002] Laser technology is widely used in laser ranging, laser scanning and laser radar and other fields. Especially with the development of artificial intelligence and unmanned driving technology in recent years, the importance of lidar as an important sensor and measurement unit is self-evident. At present, the methods of laser ranging mainly include triangulation method, pulse method, phase method and frequency modulated continuous wave (FMCW) method, among which the triangulation method uses the laser echo to fall on different positions of the detector to achieve distance measurement, and the measurement distance of this method is relatively short. The phase method is to measure the phase difference between the echo ...

Claims

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Application Information

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IPC IPC(8): G01S17/34
CPCG01S17/34
Inventor 郜峰利彭涛陶敏宋俊峰于思瑶李雪研刘建英
Owner JILIN UNIV
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