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Improved space-time adaptive monopulse angle measurement method based on local joint processing

A local joint processing and space-time self-adaptive technology, which is applied to direction finders, measuring devices, and radio wave measurement systems using radio waves, can solve the problem of large angle measurement errors, fewer channels in multi-channel airborne radar systems, and low Doppler resolution

Inactive Publication Date: 2018-11-27
HOHAI UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an improved space-time self-adaptive monopulse angle measurement method based on local joint processing for the defects involved in the background technology, which solves the problem that the multi-channel airborne radar system has fewer channels The problem of low Doppler resolution and large angle measurement error

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[0069] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0070] The invention discloses an improved space-time self-adaptive monopulse angle measurement method based on local joint processing. angle, iteratively updating the space-time dimensionality reduction matrix of the JDL algorithm and the space-time steering vector of target detection can significantly reduce the Doppler crossover loss, thereby improving the output signal-to-noise ratio. This method only needs two iterations to accurately estimate the target space angle.

[0071] Assuming that the radar antenna has N array elements, each array element antenna is isotropic, and the number of pulses in one coherent accumulation period is K, then the radar signal Doppler unit signal model of the detection unit can be expressed as follows:

[0072] z=bs+n

[0073] Among them, z represents the signal vector received by the detection unit array, b rep...

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Abstract

The invention discloses an improved space-time adaptive monopulse angle measurement method based on Joint Domain Localized (JDL) processing. When a target space frequency and a doppler frequency are mismatched at the same time, a space-time domain dimension-reducing matrix and a target detection space-time guiding vector of a JDL algorithm are iterated and updated by the target doppler frequency and the target azimuth obtained by estimation. Problems that a multichannel airborne radar system has few channels, low doppler resolution and large angle measurement errors are solved. The invention can accurately estimate the target space angle by two steps of iteration, and is easy to implement in engineering.

Description

technical field [0001] The invention relates to the field of airborne radar monopulse angle measurement, in particular to an improved space-time self-adaptive monopulse angle measurement method based on local joint processing. Background technique [0002] When the airborne radar looks down, ground clutter seriously causes Doppler broadening, which makes moving targets easily submerged by clutter and affects radar target detection performance. [0003] In 1973, Brennan et al proposed the use of space-time two-dimensional adaptive signal processing (STAP) to suppress clutter. STAP performs space-time two-dimensional filtering, selects training samples through the adjacent distance unit of the unit to be detected (CUT), and adaptively calculates the weight of the filter. A powerful tool for clutter. [0004] Although the application of STAP technology can improve the performance of target detection, it cannot estimate the target angle. The adaptive monopulse technique propo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S3/06G01S13/44
CPCG01S3/06G01S3/14G01S13/44
Inventor 于佳沈明威纪存孝胡佩郑佳芝
Owner HOHAI UNIV
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