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Nonlinear processing method for suppressing false target based on double V-chirp

A technique for nonlinear processing and false targets, which is applied in the field of nonlinear processing based on dual V-chirp signals to suppress false targets. , good effect, easy to calculate effect

Active Publication Date: 2016-07-06
NAT UNIV OF DEFENSE TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the nonlinear processing method can improve the resolution of the target compared with the linear processing method, when there are multiple targets in the scene, both nonlinear and linear processing methods will appear false targets, resulting in false alarms and seriously affecting the accuracy of real images. Estimation of Target Delay and Doppler Shift

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  • Nonlinear processing method for suppressing false target based on double V-chirp
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  • Nonlinear processing method for suppressing false target based on double V-chirp

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Embodiment Construction

[0015] figure 1 It is the realization flowchart of the present invention. For the double V-chirp echo signal obtained, the specific implementation method includes the following steps:

[0016] In the first step, the four LFMs in the dual V-chirp transmission signal are used to obtain the mutual ambiguity function for the echo signal, and four time-delay-Doppler frequency shift images of the echo signal are obtained.

[0017] Note that the four LFM echo parts in the double V-chirp transmission signal are respectively s 1 (t), s 2 (t), s 3 (t) and s 4 (t), the echo signal is s r (t). Then by calculating the mutual ambiguity function, the four time-delay-Doppler shifted images of the echo signal are obtained as follows:

[0018] I 1 (τ,f d )=∫s r (t)s 1 * (t-τ)exp(j2πf d t) dt, I 2 (τ,f d )=∫s r (t)s 2 * (t-τ)exp(j2πf d t)dt,

[0019] I 3 (τ,f d )=∫s r (t)s 3 * (t-τ)exp(j2πf d t) dt, I 4 (τ,f d )=∫s r (t)s 4 * (t-τ)exp(j2πf d t)dt, in the above for...

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Abstract

The invention provides a nonlinear processing method for suppressing a false target based on double V-chirp. The technical scheme is that radar transmits double V-chirp signals, and the two V-chirp signals are identical in pulse width and different in bandwidth; four LFMs forming the double V-chirp transmitting signals are respectively utilized on echo signals to solve a mutual fuzzy function, and four delay-Doppler frequency shift images of the echo signals are obtained; and nonlinear processing is adopted on the four delay-Doppler frequency shift images so that the final delay-Doppler frequency shift images are obtained. The false target generated by the conventional single V-chirp signal in a multi-target scene can be effectively suppressed without loss of resolution. The nonlinear processing method is easy and convenient to calculate, great in effect and convenient for practical application.

Description

technical field [0001] The invention belongs to the field of radar signal processing and relates to a nonlinear processing method for suppressing false targets based on double V-chirp signals. Background technique [0002] When the matched filter is used for target detection on the received echo signal, the resolution of the target can be obtained by using the ambiguity function χ(τ,f of the transmitted signal s(t) d ) to describe, the specific expression is as follows: [0003] χ(τ,f d ) = ∫s(t)s * (t-τ)exp(j2πf d t)dt [0004] where τ and f d represent time delay and Doppler frequency shift respectively, so the ambiguity function is a time delay-Doppler frequency shift image. The projection of the ambiguity function -3dB main lobe on the delay axis is called the delay resolution, and the projection on the Doppler frequency shift axis is called the Doppler frequency shift resolution. However, studies have shown that creatures that use echoes to detect targets in natu...

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Application Information

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IPC IPC(8): G01S7/292G01S13/89
CPCG01S7/2923G01S13/89
Inventor 黄晓涛朱家华范崇祎韩素丹
Owner NAT UNIV OF DEFENSE TECH