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Signal Processing Method for LFM CW Radar Ranging

A technology of signal processing and linear frequency modulation, applied in radio wave measurement system, radio wave reflection/re-radiation, measurement device, etc., can solve problems such as noise interference, improve distance measurement accuracy, meet real-time performance and anti-interference Capability requirements, effects of high computing efficiency

Active Publication Date: 2021-08-03
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, these methods can only initially improve the frequency estimation accuracy, and are susceptible to noise interference

Method used

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  • Signal Processing Method for LFM CW Radar Ranging
  • Signal Processing Method for LFM CW Radar Ranging
  • Signal Processing Method for LFM CW Radar Ranging

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Embodiment Construction

[0060] The present invention will be described in detail below with reference to the specific embodiments. The following examples will help to further understand the present invention in any form of technicrat, it will be further understood by those skilled in the art. It should be noted that several variations and improvements can be made without departing from the concept of the present invention without departing from the present invention. These are all of the scope of protection of the present invention.

[0061] like figure 1 As shown, the signal processing method of the linear frequency modulous wave radar ranging provided by the present invention includes the following steps:

[0062] Step 1: Disperse the differential signal S (T) to obtain a discrete difference signal S (N);

[0063] During the actual radar ranging process, the abbot signal is inevitably subject to the interference of the sweep modulation signal, so the way to trigger acquisition can be used, and the swee...

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Abstract

The invention provides a signal processing method for linear frequency modulation continuous wave radar ranging, comprising step 1, sampling the beat signal s(t) to obtain a discrete beat signal s(n); step 2, s(n) Perform discrete Fourier transform to obtain the spectrum F(n), and obtain the number of components K and the initialization frequency of each component by comparing the spectrum amplitude. Step 3. If it is a single-component signal, skip to step 4. Otherwise, perform The signal is decomposed to obtain K independent components; Step 4: Perform accurate frequency parameter estimation on each component in turn; Step 5: Calculate the distance between the target and the radar. The invention can self-adaptively separate multiple target components, and remarkably improve the ranging accuracy. High computing efficiency and good anti-noise performance meet the real-time and anti-jamming capability requirements of LFMCW radar field ranging.

Description

Technical field [0001] The present invention relates to the field of radar ranging technology, and in particular, to signal processing methods of linear frequency modulus continuous wave radar ranging. Background technique [0002] Radar ranging is a non-contact measurement technology that can be stabilized in harsh environments, not susceptible to weather conditions such as rain and snow, and has the ability to penetrate smog and dust. Among them, Linear FrequencyModulation Continuous Wave, referred to as LFMCW) radar has the advantages of small radiation power, compact structure, and low cost, and widely used in civil and military fields. The principle is to detect the continuous wave of the target transmitted linear frequency modulation and receive the electromagnetic echo of the target scatter, and mix the echo with the local oscillator signal to obtain a differential signal, thereby extracting the distance information of the target. [0003] Conventionally, the frequency poi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/34
CPCG01S13/34
Inventor 彭志科熊玉勇
Owner SHANGHAI JIAOTONG UNIV
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