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Squint InSAR combining DEM and GMTI processing method based on five-element cross array

A processing method, cross array technology, applied in radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problem that the quantitative expression of elevation phase cannot be obtained, GMTI and DEM cannot be realized at the same time, and severe fluctuations in height cannot be applied scene and other issues

Active Publication Date: 2016-08-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, such methods cannot be applied to highly volatile scenes, such as cities with a large number of man-made buildings.
At the same time, these methods have not obtained the quantitative expression of the elevation phase, and cannot simultaneously realize the GMTI and DEM under the vertical baseline squint

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  • Squint InSAR combining DEM and GMTI processing method based on five-element cross array
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  • Squint InSAR combining DEM and GMTI processing method based on five-element cross array

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0037] The present invention provides a squint InSAR joint DEM and GMTI processing method based on a five-element cross array. Firstly, a cross-vertical baseline InSAR system configuration based on a forward-looking array is designed, and for this configuration, a The squint SAR-GMTI method based on two-dimensional interference, which utilizes the nature of the vertical and horizontal baseline interferometric phases, realizes complex terrain clutter cancellation and decoupling of the height and velocity of moving and static targets.

[0038] Specifically include the following steps:

[0039] Step 1: Design a cross array of vertical tracks, such as figure 2 As shown, a r and a l The two array elements are arranged along the horizontal and vertical directions, that is, a r and a l The connection line is parallel to the imaging plane xOy, and with the p...

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Abstract

The invention discloses a squint InSAR combining DEM and GMTI processing method based on a five-element cross array. Complex landform clutter cancellation and moving and static target height and speed decoupling are realized through the method, thereby realizing DEM measurement of front-view array plane InSAR, SAR-GMTI and three-dimensional positioning function of moving targets. The method includes the steps of designing a vertical track five-element cross array comprising upper, middle, lower, left and right elements, conducting squint imaging processing and pre-processing for data of each channel, completing clutter cancelled CFAR detection by using images of upper, middle and right channels, calculating horizontal vertical baseline interference phase susceptibility function of the moving target, obtaining the speed and the real position of the moving target, and completing DEM measurement through a vertical baseline. The method is applicable to a complex landform, realizes estimation of the height of a moving target, improves parameter estimation precision of the target, and can conduct three-dimensional landform plotting, moving target detection, moving target speed estimation and three-dimensional positioning simultaneously.

Description

technical field [0001] The invention belongs to the technical field of radar system design and signal processing, and relates to interferometric SAR height measurement and ground moving target detection technology, in particular to a squint InSAR combined DEM and GMTI processing method based on a five-element cross array. Background technique [0002] Ground Moving Target Indication (GMTI) and joint Digital Elevation Model (DEM) generation are two important functions of Interferometric Synthetic Aperture Radar (InSAR). GMTI is mainly realized by multi-channel InSAR with side-viewing along the track, and DEM is realized mainly by multi-channel InSAR with side-looking view along the vertical track. However, many actual SAR system baselines are not necessarily strictly along the track or vertical track, and there will be a need for squint detection, but they also urgently need to have GMTI and DEM functions. For example, fire control, early warning and navigation radars, most ...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9041G01S13/9023G01S13/9029
Inventor 景凯许稼龙腾姚迪黄祖镇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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