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Method and device for FMCW radar ranging

A radar ranging and radar technology, which is applied in the field of FMCW radar ranging, can solve the problems of large ranging error and adverse effects of phase difference method measurement results, and achieve the effect of improving accuracy

Active Publication Date: 2011-01-26
ULTRONIX PRODS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phase difference method is very sensitive to the phenomenon of spectral interference, which will have an adverse effect on the measurement results of the phase difference method.
Therefore, the current FMCW radar uses the phase difference method for spectrum correction to make a large ranging error, and further improvement is necessary

Method used

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  • Method and device for FMCW radar ranging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] see figure 1 Shown, a kind of method of FMCW radar ranging, comprises steps:

[0038] S101: Perform spectrum analysis on the FMCW radar intermediate frequency signal after A / D sampling.

[0039]In an embodiment of the present invention, a fast Fourier transform algorithm (FFT) is used for spectrum analysis, and the FMCW radar intermediate frequency signal is divided into two sections for FFT transformation. In order to make the effect of spectrum change better, it is also possible to consider adding a window to the fast Fourier transform algorithm for spectrum analysis. The windowing function can be selected from functions such as Hanning, Blackman-Harris, and Kaiser-Bessel. Of course, in other embodiments of the present invention, spectrum analysis using other Fourier transform algorithms or other algorithms is also within the protection scope of the present invention.

[0040] S102: Judging whether the FMCW radar intermediate frequency signal satisfies the correctio...

Embodiment 2

[0068] see figure 2 Shown, a kind of method of FMCW radar ranging, comprises steps:

[0069] S201: Filter the FMCW radar intermediate frequency signal after the A / D sampling, and filter out the modulation wave leaked from the microwave device in the intermediate frequency signal, that is, the leakage modulation wave.

[0070] Because the FMCW radar is affected by the parasitic amplitude modulation of the voltage controlled oscillator, the final intermediate frequency signal contains a leakage modulation wave with a fixed value, and the amplitude of the signal part containing the distance information in the intermediate frequency signal is proportional to the fourth power of the distance R Inversely, as the distance increases, the useful signal will be submerged in the leakage signal, which greatly limits the ranging of the FMCW radar. And the leakage signal will also have an adverse effect on the correction of the subsequent phase difference method. In this embodiment, the ...

Embodiment 3

[0084] see image 3 As shown, a FMCW radar ranging device includes a spectrum analysis module 301, a phase detection module 302 and a distance calculation module 303, wherein:

[0085] The spectrum analysis module 301 is configured to perform spectrum analysis on the FMCW radar intermediate frequency signal after A / D sampling.

[0086] The phase detection module 302 is configured to detect whether the spectrum of the FMCW radar intermediate frequency signal after spectrum analysis satisfies the phase difference detection condition.

[0087] Distance calculation module 303, for calculating the distance according to the judgment result of phase detection module 302, if satisfied, then apply the phase difference method to carry out spectrum correction, obtain the corrected intermediate frequency, and calculate the distance according to the corrected intermediate frequency; if not satisfied, then The distance is calculated using the IF frequency obtained after spectrum analysis. ...

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Abstract

The invention discloses a method and a device for FMCW radar ranging. The method comprises the following steps of: performing spectrum analysis on an FMCW radar intermediate-frequency signal after analog to digital (A / D) sampling; judging whether the frequency spectrum of the FMCW radar intermediate-frequency signal meets the correcting condition of a phase difference method or not; correcting the frequency spectrum by the phase difference method if the signal meets the correction condition so as to acquire the corrected intermediate frequency, and computing the range according to the corrected intermediate-frequency; and computing the range by using the intermediate frequency acquired after the spectrum analysis if the signal does not meet the correction condition. In the method, whetherthe FMCW radar intermediate-frequency signal meets the correcting condition of the phase difference method or not is judged before the frequency spectrum of the FMCW radar intermediate-frequency signal is corrected by the phase difference method, so that excellent measuring results can be acquired by the phase difference method. Therefore, the method and the device improve the accuracy of FMCW radar ranging.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to a method and device for FMCW radar ranging. Background technique [0002] FMCW (Frequency Modulated Continuous Wave) radar transmits a series of continuous frequency-modulated millimeter waves through the transmitting antenna, uses the receiving antenna to receive the reflected signal from the target, and measures the distance of the target object according to the time difference between the received signal and the transmitted signal. FMCW radar has been proposed for many years, but this kind of radar has a relatively small range due to the influence of leakage modulation waves. [0003] When the modulating waveform is a sawtooth wave, set the period of the sawtooth wave as T, and the frequency-sweeping bandwidth of the resulting FM signal is ΔF. The transmitter emits a signal f t , the frequency also uses f t Indicates; echo signal f r , the frequency also uses f ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/08G01S7/40
Inventor 黄利君陈伟吴泽俊周建波戴勇徐峰姚欣王新安
Owner ULTRONIX PRODS
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