Fully Coherent Continuous Wave Doppler Radar and Its Range and Velocity Measurement Method

A radar ranging and Doppler frequency technology, which is applied in the field of full coherent continuous wave Doppler radar and its ranging and speed measurement, can solve the problem of not having the ability of ranging, unable to measure speed, increasing the sampling rate of intermediate frequency and the amount of signal processing calculation And other issues

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A radar ranging and Doppler frequency technology, which is applied in the field of full coherent continuous wave Doppler radar and its ranging and speed measurement, can solve the problem of not having the ability of ranging, unable to measure speed, increasing the sampling rate of intermediate frequency and the amount of signal processing calculation And other issues

CN106405541BActive Publication Date: 2021-06-01SUZHOU TUSHI ELECTRONICS TECH CO LTD

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[0083] The present invention provides a fully coherent continuous wave Doppler radar and a distance measuring and speed measuring method thereof. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0084] The present invention adopts the full-phase coherent quasi-sawtooth continuous wave transmission waveform, which combines the characteristics of the pulse system and the continuous wave system. Continuous wave signal, its signal form is as figure 1 and figure 2 shown. Under this technical system, the difference frequency complex signal obtained by mixing the echo signal and the transmitted signal is obtained first, and according to the modulation characteristics of the range frequency-Doppler frequency and the target range-velocity, the two-dimensional FFT+azimuth dimension MTD is used Dimensional joint detection method, such as image 3 As shown, multiple coherent high-repetition frequency modulation signals...

Embodiment 2

[0110] An example is given below to further illustrate the implementation of the technical solution of the present invention.

[0111] Suppose the radar operating frequency f 0 It is 32.4GHz, the transmission signal modulation bandwidth B is 120MHz, and the transmission repetition period T r 3us, sampling rate f s 70MHz, the number of FM cycles processed is 64, and the distance between the platform and the target is set to R 0 =10m, the relative velocity is v=700m / s.

[0112] According to the technical solution of the present invention, the difference frequency signals received by multiple frequency modulation cycles are digitally sampled, and then the target difference frequency complex signal is obtained by Hilbert filtering, and 64 times of 128-point FFT and 64-point MTD are performed on the signal Processing, the target two-dimensional spectrum distribution is obtained, and the simulation results of the spectrum distribution are as follows Figure 4 shown.

[0113] Ac...

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Abstract

The invention discloses a fully coherent continuous wave Doppler radar and its distance measurement and speed measurement method. First, the difference frequency complex signal obtained by mixing the echo signal and the transmission signal is obtained, and according to the range frequency-Doppler frequency and the target distance ‑Modulation characteristics of velocity, using the two-dimensional joint detection method of distance dimension FFT + azimuth dimension MTD, using multiple coherent high repetition frequency modulation signals to independently obtain unambiguous radial velocity information, and then introduce the velocity into the Doppler The information is removed in the distance dimension and frequency domain information to eliminate the influence of distance-velocity coupling, so as to further obtain accurate distance information. The invention has the characteristics of coherent radar speed measurement and continuous wave radar distance measurement without distance blind zone, and meets the requirements of no distance blind zone, simultaneous distance measurement and speed measurement, real-time performance, miniaturization, and low power consumption.

Description

technical field [0001] The invention relates to the field of continuous wave measuring radar, in particular to a fully coherent continuous wave Doppler radar and a method for measuring distance and speed. Background technique [0002] The traditional full-coherent radar that can measure distance and speed at the same time adopts the pulse Doppler system. The distance between the target is determined by measuring the time difference between the target reflection signal and the transmitted pulse by transmitting a coherent pulse train, and the Doppler of the echo signal is analyzed by FFT between pulses. The spectrum obtains the speed information of the target, so it has the two-dimensional measurement capability of distance and speed. However, there is a distance blind zone in this system, and in the case of high resolution requirements, the pulse system needs to take into account the requirements of both narrow pulse and large bandwidth, which increases the difficulty of sign...

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Application Information

Patent Timeline

01 Jun 2021

Publication

CN106405541B

IPC: G01S13/87

CPC: G01S13/87

Inventors: 孙英钦