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Frequency modulated continuous wave ranging method based on stitching signals without abrupt phase change

A technology of frequency modulation continuous wave and phase mutation, which is applied in the direction of radio wave measurement system, radio wave reflection/re-radiation, measurement device, etc. It can solve the problems that frequency modulation continuous wave distance measurement cannot be realized, and achieve the effect of high distance resolution

Inactive Publication Date: 2013-02-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem in the prior art that the frequency modulation continuous wave distance measurement cannot be realized due to the limitation of the modulation frequency deviation

Method used

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  • Frequency modulated continuous wave ranging method based on stitching signals without abrupt phase change
  • Frequency modulated continuous wave ranging method based on stitching signals without abrupt phase change
  • Frequency modulated continuous wave ranging method based on stitching signals without abrupt phase change

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Embodiment 1

[0030] Frequency modulation continuous wave ranging system, sawtooth wave modulation, modulation frequency deviation ΔF=100MHz, modulation period According to the traditional method ΔR min =c / 2ΔF=1.5m. Assuming that the ranging range of the system is 2.5-5m, the echo delay τ=0-3.33×10 -8 s, difference frequency range 0-666.7KHz, under the condition of Fs=40MHz. According to a kind of FM continuous wave ranging method based on splicing signals without phase mutation described in this embodiment, the specific steps are as follows:

[0031] Step 1: Convert the difference frequency real signal into a complex signal. At present, there are many methods. Here, after the analog-to-digital converter ADC samples the difference frequency signal, the Hilbert transform is used to obtain the complex signal. That is, perform FFT on the difference frequency signal to obtain the spectrum, remove the negative half axis of the spectrum, and then perform IFFT to obtain the complex signal.

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Abstract

The invention discloses a frequency modulated continuous wave ranging method based on stitching signals without abrupt phase change, relates to a frequency modulated continuous wave ranging method and belongs to the frequency modulated continuous wave ranging field. The frequency modulated continuous wave ranging method comprises the following steps: Step I, changing a difference frequency real signal into a complex signal; Step II, taking a difference frequency complex signal in a rule zone; Step III, dividing the first data sk (0) of each segment of data by the last data S(N-1) (k is smaller than or equal to N-1 and larger than or equal to 1) of the previous segment of data; Step IV, achieving spectral analysis on s' in the Step III to estimate the difference frequency signal frequency value fb; and Step V, calculating the object distance R according to the relationship between the difference frequency signal and the object distance. According to the invention, the distance resolution of the frequency modulated continuous wave ranging method is improved by N times than that of a traditional method, and is not restricted by the modulation frequency deviation, so that the frequency modulated continuous wave ranging method can still be used on occasions where high modulation frequency deviation can not be satisfied because the cost and the size are restricted so as to obtain high distance resolution.

Description

technical field [0001] The invention relates to a frequency modulation continuous wave distance measurement method, in particular to a frequency modulation continuous wave distance measurement method based on spliced ​​signals without phase mutation, and belongs to the field of frequency modulation continuous wave distance measurement. Background technique [0002] The FM continuous wave ranging system is widely used in altimeter, liquid level measurement, anti-collision radar, fuze and other fields. In this type of system, a linear frequency modulation signal is transmitted, and the transmitted signal generates an echo after hitting the target. Due to the delay of the echo signal, there is a difference between the frequency of the echo signal and the frequency of the transmitted signal, and the distance between the difference frequency and the target distance There is a fixed relationship, and accurate detection of the difference frequency can accurately measure the distanc...

Claims

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Application Information

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IPC IPC(8): G01S13/34
Inventor 潘曦徐立新王正浩向程勇张兆森
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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