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Method and system for eliminating linear frequency modulation continuous wave (LFMCW) radar modulation leakage

A linear frequency modulation and elimination system technology, applied in radio wave measurement systems, instruments, etc., can solve the problem of not fully considering the influence of the dynamic range and sensitivity of the ADC circuit, and achieve the effect of simple structure and strong adaptability

Active Publication Date: 2016-11-16
FUDAN UNIV +1
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Problems solved by technology

In the traditional RF and IF cancellation system, the influence of the ADC circuit on the dynamic range and sensitivity of the system has not been fully considered

Method used

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  • Method and system for eliminating linear frequency modulation continuous wave (LFMCW) radar modulation leakage

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and embodiment, further describe the present invention. The IF signal from the RF front-end of the 24GHz FM CW anti-collision radar modulated by triangular wave is input to the variable gain amplifier (VGC) 1, and the IF signal is amplified to an appropriate amplitude, and then input to the ADC 2 of the IF signal. The output signal of the ADC 2 of the IF signal is divided into two paths, one path is input to the judgment unit 5, to control the amplification of the variable gain amplifier (VGC) 1, so as to prevent the overload of the ADC 2 of the IF signal caused by the excessive amplification of the IF signal; to the leakage signal extraction unit 3 to extract the modulation leakage signal. Since the modulation leakage signal of the radar system is basically unchanged after the radar structure is determined, the modulation leakage signal of the triangular wave can be extracted by the signal accumulation averaging method or ...

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Abstract

The invention relates to the technical field of radar modulation, in particular to a method and a system for eliminating linear frequency modulation continuous wave (LFMCW) radar modulation leakage. The method comprises the steps of: extracting a path of modulation leakage signals by means of an IF signal, fitting a path of modulation leakage signals based on a reference modulation signal, carrying out self-adaptive adjustment on fitting parameters according to correlation operation and fitting error operation of the two paths of modulation leakage signals, and realizing cancellation of modulation signal leakage in a full-digital domain; and carrying out self-adaptive adjustment on fitting parameters such as fitting signal amplitude coefficients and phase positions until the maximum correlation value and the minimal fitting error are obtained, wherein a fitting modulation signal obtained at the moment is approximate to the modulation leakage signals contained in the IF signal, and a target echo signal after eliminating modulation leakage is obtained through subtracting the modulation leakage signals from the IF signal. The method and the system realizes the cancellation of the IF modulation leakage signals in the full-digital domain, simplifies design of the front segment of radar radio frequency, and makes the entire radar system simple and flexible in structure.

Description

technical field [0001] The invention belongs to the technical field of radar modulation, and in particular relates to a method and system for eliminating leakage of linear frequency modulation continuous wave radar. Background technique [0002] Compared with the pulse system radar, the linear frequency modulation continuous wave (LFMCW) system radar has the characteristics of small size, light weight, low peak transmission power, and no distance blind zone. It is very suitable for applications in the fields of automobile collision avoidance and security. However, because LFMCW radar transmits and receives signals at the same time, the leakage signal from transmission to reception will have a great impact on the receiving performance of the radar receiver. [0003] In the field of automobile anti-collision and security protection, the radar operating distance is generally tens of centimeters to hundreds of meters, and its transmission signal power is generally around 10dBm (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
CPCG01S7/023
Inventor 肖鹏程郭剑鹰张枝高李文宏陆振海韦园园石磊房旭龙朱佳南李振华
Owner FUDAN UNIV
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