Small-wavelet-packet-based 24GHz LFMCW (Linear Frequency Modulation Continuous Wave) radar ranging method

A technology of radar ranging and wavelet packet, which is applied in the direction of radio wave measurement system, radio wave reflection/reradiation, measurement device, etc., and can solve problems such as limitation and reduction of echo signal power

Inactive Publication Date: 2012-11-28
CHONGQING UNIV
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Problems solved by technology

The beat signal is obtained by mixing the transmitted signal and the echo signal. However, the attenuation of the signal in the millimeter wave band is very obvious. As the target distance increases, the power of the echo signal will decrease sharply, which limits the linear frequency modulation continuous wave LFMCW millimeter wave Application of Radar in Long-distance Ranging

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  • Small-wavelet-packet-based 24GHz LFMCW (Linear Frequency Modulation Continuous Wave) radar ranging method
  • Small-wavelet-packet-based 24GHz LFMCW (Linear Frequency Modulation Continuous Wave) radar ranging method
  • Small-wavelet-packet-based 24GHz LFMCW (Linear Frequency Modulation Continuous Wave) radar ranging method

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Embodiment Construction

[0024] This embodiment is implemented on the premise of the technical solution of the present invention, and the specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings:

[0025] In this embodiment, the 24GHz linear frequency modulation continuous wave LFMCW radar measures the distance of the target, including the following steps:

[0026] 1) The transmission signal of the linear frequency modulation continuous wave LFMCW radar is transmitted through the antenna, and an echo signal is formed when it encounters a target. The echo signal and the transmission signal are mixed and filtered to obtain a beat signal.

[0027] 2) Select db3 wavelet and wavelet decomposition layers , for the beat signal Perform wavelet packet decomposition to obtain wavelet packet coefficients on a series of subbands :

[0028]

[0029] In the formula, ; is the wavelet packet function, which can be composed of the wavele...

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Abstract

The invention discloses a small-wavelet-packet-based 24GHz LFMCW (Linear Frequency Modulation Continuous Wave) radar ranging method which comprises the following steps of: carrying out frequency mixing and filtering on an echo signal and a transmission signal of an LFMCW radar to obtain a beat signal; treating the beat signal by utilizing a decomposition algorithm and a single-node reconstruction algorithm of a small wavelet packet to obtain a sing-node reconstructed signal; and carrying out fast Fourier transform on the reconstructed signal of the small wavelet packet to obtain frequency spectrum information of the signal; and finding a frequency corresponding to the maximum amplitude of a frequency spectrum and substituting the frequency into a distance formula to compute a target distance. The ranging method provided by the invention is capable of extracting long-distance target information under low signal to noise ratio so as to enlarge the effective action distance of the radar.

Description

technical field [0001] The invention relates to a 24GHz LFMCW radar ranging method based on wavelet packets, which is a core technology for vehicle ranging and speed measurement, evaluation of multilayer dielectric structures, measurement of altitude and speed of flying objects on the earth's surface, and helicopter classification. It can be widely used in various military and civilian systems. Background technique [0002] Compared with infrared sensors, ultrasonic sensors, and image processing sensor equipment, millimeter wave radar has the advantages of being less affected by the environment, high precision, and high resolution. Millimeter-wave radar systems based on frequency modulation continue wave (LFMCW) technology are widely used in both civilian and military applications. Therefore, how to further improve the ranging accuracy of linear frequency modulation continuous wave LFMCW millimeter-wave radar and increase the effective range of radar is still a hot topic. ...

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Application Information

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IPC IPC(8): G01S13/34
Inventor 谭晓衡周帅秦基伟唐永刚马旭东黄振林裴婧
Owner CHONGQING UNIV
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