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Method and system for direct wave suppression of frequency modulated continuous wave radar

A frequency-modulated continuous wave and direct wave technology, applied in the field of radar systems, can solve problems such as application limitations, reduce the range and imaging width of radar systems, and achieve the effect of improving dynamic range, solving direct wave interference, and ensuring linearity.

Active Publication Date: 2021-11-05
中科宇达(北京)科技有限公司
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Problems solved by technology

Reducing the transmission power will inevitably reduce the radar system's operating range and imaging width; while the method of increasing the distance between the transmitting and receiving antennas and improving the isolation of the transmitting and receiving system is limited by the space size of the radar carrying platform, and its application is limited

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  • Method and system for direct wave suppression of frequency modulated continuous wave radar
  • Method and system for direct wave suppression of frequency modulated continuous wave radar
  • Method and system for direct wave suppression of frequency modulated continuous wave radar

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Embodiment Construction

[0041] The present disclosure provides a method and system for direct wave suppression of FM continuous wave radar. On the whole, a method combining antenna isolation, channel isolation and signal processing is proposed for direct wave suppression, which ensures the linearity of the front end of the transceiver, and at the same time through deFM reception The method and filtering measures improve the dynamic range of the receiving channel; on the premise of not affecting the system performance, the suppression of the direct wave is realized, and the problem of the direct wave interference of the FM continuous wave radar is solved.

[0042] In this disclosure, the term "transceiving antenna" refers to both a receiving antenna and a transmitting antenna. "Useful echo signal" is a term to distinguish it from "echo signal". "Useful echo signal" refers to the echo signal of the scene area; while "echo signal" refers to the echo received by the receiving channel Signals, including d...

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Abstract

The invention discloses a method and system for suppressing the direct wave of frequency modulation continuous wave radar. Among them, the method includes: through the method of antenna isolation, the power of the direct wave signal in the echo signal entering the receiving channel is lower than the P of the low noise amplifier of the radar receiving front end. ‑1 value; and convert the frequency of the direct wave signal to a fixed frequency by using de-FM reception, so that the direct wave signal and the useful echo signal in the echo signal are separated in the frequency domain, and the direct wave signal is filtered on the echo signal. On the whole, the method of combining antenna isolation, channel isolation and signal processing is proposed to suppress the direct wave, which ensures the linearity of the transceiver front-end. At the same time, the dynamic range of the receiving channel is improved through the de-FM receiving method and filtering measures; without affecting the system performance. On the premise of achieving the suppression of the direct wave, it solves the problem of direct wave interference of frequency modulation continuous wave radar.

Description

technical field [0001] The disclosure belongs to the technical field of radar systems, and relates to a method and system for suppressing direct waves of frequency-modulated continuous wave radars. Background technique [0002] Since the FM CW radar receives the signal while transmitting the signal, the transmitted signal is directly fed into the receiving channel, which seriously affects the dynamic range of the FM CW radar system, and even causes the receiving channel to be saturated, and the radar system cannot work normally. In order to realize a highly dynamic frequency modulation continuous wave radar system, the problem of direct wave interference of frequency modulation continuous wave radar must be solved. [0003] The direct wave interference caused by direct wave interference caused by the direct leakage of FM continuous wave radar transmission signal into the receiving channel has always been one of the difficult problems in the design of FM continuous wave radar...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 董勇伟
Owner 中科宇达(北京)科技有限公司
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