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Airborne forward-looking frequency diversity array radar distance fuzzy clutter suppression method

A frequency diversity array, clutter suppression technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as distance dependence and distance ambiguity, and achieve the effect of improving suppression performance and suppressing distance ambiguity clutter.

Inactive Publication Date: 2015-05-20
XIDIAN UNIV
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Problems solved by technology

In the spatial frequency domain, the clutter in the unambiguous distance zone and the clutter in the ambiguous distance zone are distinguished, and the quadratic distance-dependent compensation is combined with the traditional clutter spectrum compensation method to solve the problem of distance dependence and range ambiguity at the same time

Method used

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  • Airborne forward-looking frequency diversity array radar distance fuzzy clutter suppression method
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  • Airborne forward-looking frequency diversity array radar distance fuzzy clutter suppression method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] refer to figure 2 , is a schematic diagram of the geometric model and echo receiving process of the airborne front-facing frequency diversity array radar of the present invention. The height of the carrier (platform height) is H, the speed of the carrier is V, the number of coherent pulses received by the airborne front-view frequency diversity array radar is K, and the coherent pulse interval of the signal transmitted by the airborne front-view frequency diversity array radar is T r , the pulse repetition frequency f of the transmitted signal of the airborne front-view frequency diversity array radar r =1 / T r .

[0036] In the airborne front-view frequency diversity array radar, the frequency diversity array is a uniform linear array composed of N omnidirectional elements, and the distance between the elements in the frequency diversity array is d. The car...

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Abstract

The invention belongs to the technical field of radar clutter suppression, and particularly relates to an airborne forward-looking frequency diversity array radar distance fuzzy clutter suppression method. The method comprises the following specific steps: acquiring the echo space-time snapshot data xc of an airborne forward-looking frequency diversity array radar; determining the secondary distance dependence compensation vector of a non-fuzzy distance region and the secondary distance dependence compensation vector of a fuzzy distance region; acquiring a secondary distance dependence compensation vector in an airspace-Doppler combined frequency region; acquiring echo space-time snapshot data after secondary distance dependence compensation; performing space-time adaptive processing on the echo space-time snapshot data after secondary distance dependence compensation of the non-fuzzy distance region and the echo space-time snapshot data after secondary distance dependence compensation of the fuzzy distance region respectively.

Description

technical field [0001] The invention belongs to the technical field of radar clutter suppression, and in particular relates to a method for suppressing range ambiguity clutter of an airborne front-view frequency diversity array radar, which is mainly used for distinguishing clutter in an unambiguous range zone and clutter in an ambiguous range zone in a spatial frequency domain. Background technique [0002] Space-time adaptive processing (STAP) has important application value in airborne early warning radar, which can combine time and space information to detect targets from clutter and interference. In the airborne side-looking array radar, the coupling relationship between the airspace frequency and Doppler frequency of clutter does not change with the distance. However, in some special airborne radar applications (such as forward-looking array airborne radar, circular array airborne radar, etc.), the distance invariance of clutter distribution is no longer established, a...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 朱圣棋廖桂生许京伟张俊张骏杰王震宋萌萌
Owner XIDIAN UNIV
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