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Method of Suppressing DC Leakage of FM CW Landing Radar

A technology of frequency modulation continuous wave and DC leakage, which is applied in the field of data processing, can solve the problems that cannot meet the requirements of radar frequency estimation accuracy, etc., and achieve the effects of suppressing DC leakage, reducing the amount of calculation, and reducing surface echo variation

Active Publication Date: 2021-09-28
XIDIAN UNIV
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Problems solved by technology

[0005] Since the above-mentioned signal leakage suppression method mainly adopts isolation devices and design control circuits, it does not make full use of the spectral characteristics of the triangular-modulated LFM continuous wave in the positive and negative FM cycles to suppress the DC leakage of the radar echo. However, the radar system, which requires high actual sensitivity of the machine, still cannot meet the requirements of radar frequency estimation accuracy.

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  • Method of Suppressing DC Leakage of FM CW Landing Radar
  • Method of Suppressing DC Leakage of FM CW Landing Radar
  • Method of Suppressing DC Leakage of FM CW Landing Radar

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] refer to figure 1 , the implementation steps of the present invention are as follows:

[0029] Step 1: Obtain the echo signals of the FM CW radar based on triangular modulation in the positive and negative FM cycles respectively with

[0030] The radar transmits a triangularly modulated frequency-modulated continuous wave signal, and receives the echo signal reflected by the target after a time delay τ, which contains a positive frequency-modulated periodic signal and a negative FM signal They are expressed as follows:

[0031]

[0032]

[0033] Among them, E t is the amplitude of the radar transmitted signal, f 0 is the center frequency, μ is the modulation slope, is the random initial phase, τ is the echo delay, R(t) is the distance from the target to the radar, G is the antenna power gain, λ is the wavelen...

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Abstract

The invention discloses a method for suppressing DC leakage of frequency modulation continuous wave landing radar, which mainly solves the problems of high equipment requirements, low estimation accuracy and limited application range in the prior art. The realization scheme is: 1. Obtain frequency modulation based on triangular modulation The echo signals of the continuous wave radar in the positive and negative frequency modulation cycles respectively; 2. The positive and negative frequency modulation cycle echo signals are respectively subjected to demodulation processing, FFT processing and non-coherent accumulation to obtain the difference frequency spectrum; 3. , The difference frequency spectrum of the negative frequency modulation cycle cancels each other, and performs window processing to obtain the difference frequency spectrum after the DC leakage is suppressed. The invention suppresses the direct current leakage, reduces the surface target return waveform caused by the direct current component, improves the frequency estimation accuracy and target detection ability of the frequency modulation continuous wave radar, and reduces the calculation amount at the same time.

Description

technical field [0001] The invention belongs to the technical field of data processing, in particular to a method for suppressing DC leakage of frequency modulation continuous wave landing radar, which can be used for target detection. Background technique [0002] With the rapid development of radar technology and the in-depth study of frequency modulation continuous wave radar, frequency modulation continuous wave radar has been widely used in the fields of ranging, speed measurement, weather forecasting and so on. Frequency modulation continuous wave radar has the advantages of high distance resolution, no blind area in distance measurement, and easy system implementation. As a relatively mature signal with low probability of interception, the FM continuous wave signal with linear frequency modulation has been extensively studied and applied. In the echo signal received by FM CW radar, the spectrum remaining from the DC leakage is often distributed in a wide and uneven r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/35
CPCG01S7/354
Inventor 刘楠杨冬凡郭凯斯寻少伟张林让
Owner XIDIAN UNIV
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