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Short-range frequency-modulation continuous wave FMCW radar anti-interference method

A FM continuous wave and radar technology, used in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation and other directions, can solve problems such as mutual interference, and achieve strong anti-interference ability, long measurement distance, and easy cost. effect achieved

Active Publication Date: 2007-12-19
南京精益安防系统科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a short-range frequency modulation continuous wave FMCW radar anti-jamming method, which can carry out high-resolution, real-time measurement of the distance and speed of multiple targets in the observation area on the occasion of single or multiple radars working simultaneously, and solve the problem of Solved the problem of mutual interference between multiple radars working at the same time

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[0032] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0033] The present invention designs a set of pseudo-random codes according to the use occasions and implementation costs of the radar, assigns different pseudo-random codes to different radars, and uses different pseudo-random codes to modulate the triangular chirp (FMCW) transmit signal of the same radar in each cycle. Frequency starting point, the received echo signal is mixed with the transmitted signal, the interference signal is filtered out through the filter to retain the useful signal, and then processed according to the conventional triangular chirp (FMCW) signal processing method to obtain the desired target High-resolution distance and speed information, while suppressing interference from nearby radars. Since the signal processing method of the present invention is compatible with the conventional FMCW high-resolution radar signal processing method...

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Abstract

An anti-interfering method of short-range FMCW radar includes designing a set of pseudo-random code according to occasion of radar, distributing different pseudo-random code to different radar operated at different area, applying different pseudo-random code to modulate frequency start-point of FM emission signal for the same radar on each cycle, making frequency-mixture on received echo signal by utilizing emission signal, using filter to filter off interference signal and applying FM signal processing means to treat reserved usable signal for obtaining object distance and speed information in high resolution.

Description

Technical field [0001] The invention belongs to the technical field of radar measurement and relates to a method for radar ranging and speed measurement, in particular to a method for radar ranging and speed measurement based on a frequency-modulated continuous wave FMCW system. Background technique [0002] Interference between multiple radars is a tricky problem in applications such as automotive collision avoidance radars. In order to measure the distance and speed of multiple targets in the observation area with high resolution and real-time when multiple radars are working at the same time without interfering with each other, many methods have been adopted. [0003] The distance and speed information is obtained based on the step frequency pulse synthesis method [Zhang Jianhui, Liu Guosui, Gu Hong, Su Weimin A novel transmit signal based on high range-resolution concert for FLAR or AICC system application.[J].2001 IEEE.], the advantages of this method are The high range reso...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S13/02G01S13/34
Inventor 李牧
Owner 南京精益安防系统科技有限公司
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