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Terahertz frequency-modulated continuous wave radar high-resolution range direction reconstruction method

A high-resolution distance, frequency-modulated continuous wave technology, used in radio wave measurement systems, instruments, etc., can solve problems such as restricting applicability and harsh assumptions

Active Publication Date: 2020-09-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the assumptions of this method are too strict, which restricts its applicability

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  • Terahertz frequency-modulated continuous wave radar high-resolution range direction reconstruction method
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  • Terahertz frequency-modulated continuous wave radar high-resolution range direction reconstruction method

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[0020] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] A high-resolution range reconstruction method for terahertz frequency-modulated continuous wave radar according to the present invention, the implementation process of the method is as follows figure 1 As shown, it specifically includes the following steps:

[0022] Step 1: Obtain the one-dimensional range direction of the FM CW radar:

[0023] The transmission signal form of the chirp continuous wave radar is:

[0024] S T (t)=exp[j2π(f 0 t+1 / 2Kt 2 )] (1)

[0025] The received signal format is:

[0026] S RF (t)=exp[j2π(f 0 (t-τ)+1 / 2K(t-τ) 2 )] (2)

[0027] where f 0 is the carrier frequency, t is the time change within the pulse repetition interval T, K is the sweep rate, which is equal to the ratio of the signal bandwidth B to the pulse repetition period T, τ=2R / c is the target time delay, where c is the speed of light.

[0028] After...

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Abstract

The invention provides a terahertz frequency-modulated continuous wave radar high-resolution range direction reconstruction method, and aims to provide a high-resolution range direction software reconstruction method based on continuous wavelet transform and multi-peak Gaussian fitting in order to solve the problem that the range direction resolution of a terahertz frequency-modulated continuous wave radar is limited. The method comprises the following steps: firstly, extracting peak value information from an original one-dimensional distance direction by using continuous wavelet transform soas to obtain the number of echoes and initial value estimation of each peak value; then, carrying out multi-peak Gaussian fitting on each echo, and extracting accurate peak amplitude, position, widthand other information of each echo; and finally, reconstructing the one-dimensional range direction by using the parameters to improve the range direction resolution of the terahertz frequency-modulated continuous wave radar.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a high-resolution range reconstruction method for terahertz frequency modulation continuous wave radar. Background technique [0002] Due to the unique penetrating and non-ionizing properties of terahertz waves, terahertz detection provides new solutions for art protection, industrial product quality control, packaged integrated circuit (IC) non-destructive testing, and personnel security inspection. The linear frequency modulation continuous wave technology is widely used because of its characteristics of high power, miniaturization, low cost, and fast scanning speed. However, due to the limitations of components such as mixers, frequency multipliers, and waveguides, the frequency modulation bandwidth of the signal is limited, which also restricts the resolution in the distance direction, which brings a lot of inconvenience to the above applications. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 胡伟东李雅德许志浩倪佳琪赵云璋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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