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Radar digital signal processing method and device thereof

A digital signal processing and radar technology, applied in radio wave measurement systems, instruments, etc., can solve the problem that the distance resolution cannot be very high, and achieve the effect of improving the distance resolution

Inactive Publication Date: 2009-10-28
WUHAN UNIV
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Problems solved by technology

[0003] However, affected by the gating pulse, in order to ensure that distance aliasing does not occur, B is often limited in a limited range, so that the distance resolution cannot be very high. To be precise, the range of B is: B≤(N / T p ), where N is the number of pulses in a frequency sweep period, T p is the pulse period; the minimum distance resolution is cT p 2 / 2T, where T is the sweep period

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  • Radar digital signal processing method and device thereof

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[0029] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment:

[0030] The radar digital signal processing method proposed by the present invention specifically adopts the following technical scheme, see figure 1 , Step S1: Input radar parameters, the main parameters include: frequency sweep period T, pulse period T p , Transmit pulse width T t , Sweep frequency bandwidth B, where T=NT p , N is the number of pulses in a frequency sweep period, and each parameter satisfies N / T p p +T t ); Step S2: Calculate the maximum range element with aliasing according to the input radar parameters and the intra-pulse alias-free time t 1 ~t 2 , where t 1 =T p +T t -N / B,t 2 =N / B, take t 0 Satisfy the following relationship t 1 0 2 ;Step S3: Divide the sampling data in each pulse into two groups, t 0 The former is the first group, t 0 Then it is the second group; step S4: add 0 to the sampling points without dat...

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Abstract

The invention relates to the field of radar signal processing technology and particularly relates to a radar digital signal processing method and a device thereof. The basic principle of the radar digital signal processing method and the device thereof is that: time sharing processing is conducted to intrapulse sampling data of the linear frequency-modulated interruptive-continuous wave radar to separate original signals which have distance aliasing in the frequency domain by time, and then the separated signal spectrum is recombined to be restored to a spectrum form that has no distance aliasing. The method, differing from traditional methods that only use FFT to obtain an A-type spectrum, conducts the time sharing processing to intrapulse echoed signals. The method is characterized in that the A-type spectrum having no distance aliasing can be obtained from signals having distance aliasing and the range resolution can be increased.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a radar digital signal processing method and device. Background technique [0002] Linear Frequency Modulation Interrupted Continuous Wave (FMICW) is a pulse compression system widely used in modern radar. Added, so that the chirp interrupted continuous wave system can receive and send co-site. In principle, the range resolution of chirp interrupted continuous wave radar can reach c / 2B, where c is the speed of light and B is the frequency modulation bandwidth. [0003] However, affected by the gating pulse, in order to ensure that distance aliasing does not occur, B is often limited to a limited range, so that the distance resolution cannot be very high. To be precise, the range of B is: B≤(N / T p ), where N is the number of pulses in a frequency sweep period, T p is the pulse period; the minimum distance resolution is cT p 2 / 2T, where T is the sweep period...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28
Inventor 文必洋黄晓静王才军丁凡杨静
Owner WUHAN UNIV
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