Method capable of improving range resolution of frequency modulated continuous wave radar

A technology of frequency modulation continuous wave and distance resolution, which is applied in the direction of radio wave reflection/reradiation, climate sustainability, radio wave measurement system, etc. It can solve the problems of high hardware complexity and cost, and achieve improved distance resolution Effect

Pending Publication Date: 2022-07-12
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

The distance resolution of FMCW radar is inversely proportional to the sweep bandwidth, and in engineering applications, the increase of bandwidth means higher hardware complexity and cost, so how to solve the problem through signal processing or other methods under the condition that the distance resolution is limited by the bandwidth? Ways to improve FMCW radar ranging accuracy have always been a hot spot and difficulty in this field

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  • Method capable of improving range resolution of frequency modulated continuous wave radar
  • Method capable of improving range resolution of frequency modulated continuous wave radar
  • Method capable of improving range resolution of frequency modulated continuous wave radar

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Embodiment

[0034] A method for improving the range resolution of a frequency-modulated continuous wave radar, comprising the following steps:

[0035] 1) Signal representation: The transmitted signal of the FMCW radar touches the target to be measured and is reflected back to the radar to obtain the received echo signal. The transmitted signal and the echo signal are mixed, and the discrete difference frequency signal is obtained after AD sampling. In the case of a single target, the ideal difference frequency signal can be regarded as a sine wave signal of a single frequency, expressed as:

[0036]

[0037] where A is the amplitude, f 0 is the frequency, is the phase, and f 0 It contains the distance information of the target, so the distance of the target can be obtained by performing fast Fourier transform FFT on the difference frequency signal, and the frequency is proportional to the distance;

[0038] 2) Fast Fourier transform combined with discrete time Fourier transform FF...

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Abstract

The invention discloses a method for improving the range resolution of a frequency modulated continuous wave radar, which is characterized by comprising the following steps: 1) signal representation; the method comprises the following steps of (1) carrying out fast Fourier transform and discrete time Fourier transform (FFT) + discrete time Fourier transform (DTFT) algorithm preprocessing, (3) carrying out neural network prediction, (4) carrying out high-resolution analysis and (5) carrying out clutter removal process.By means of the method, the range resolution of the frequency-modulated continuous wave radar can be improved.

Description

technical field [0001] The invention relates to a frequency-modulated continuous wave radar technology, in particular to a method capable of improving the range resolution of a frequency-modulated continuous wave radar. Background technique [0002] Frequency-modulated continuous wave FMCW (Frequency-Modulated Continuous Wave, referred to as FMCW) radar is widely used in various fields such as high-precision detection, medical treatment, and autonomous driving due to its high measurement accuracy, simple structure, and low resistance to harsh environments. High detection accuracy, while FMCW radar has excellent ranging accuracy and no blind spot, so it has more obvious advantages than other systems in high-precision ranging. In the process of target identification and detection, the range resolution of the radar is a key parameter in the radar system. Distance resolution defines the minimum distance between two objects that can be distinguished and discerned. The excellent...

Claims

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Application Information

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IPC IPC(8): G01S13/34G01S7/41
CPCG01S13/34G01S7/415G01S7/417Y02A90/10
Inventor 蒋俊正覃承进
Owner GUILIN UNIV OF ELECTRONIC TECH
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