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A motion compensation method suitable for SAR imaging of high-speed maneuvering aircraft

A motion compensation, aircraft technology, applied in the field of electronics, can solve problems such as affecting the focusing quality of SAR images, and achieve the effect of reducing the impact and improving the imaging results

Active Publication Date: 2016-08-17
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

In the case of wide swaths, the magnitude of the phase modulation varies with range and seriously affects the focus quality of SAR images
In addition, during the dive phase, the carrier often has a large vertical velocity and vertical acceleration, while the motion error model of conventional airborne SAR generally only considers small lateral velocity and lateral acceleration, and the motion compensation of conventional airborne SAR The method is no longer suitable for SAR carried by high-speed maneuvering aircraft

Method used

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  • A motion compensation method suitable for SAR imaging of high-speed maneuvering aircraft
  • A motion compensation method suitable for SAR imaging of high-speed maneuvering aircraft
  • A motion compensation method suitable for SAR imaging of high-speed maneuvering aircraft

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Embodiment Construction

[0024] The technical solution of the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0025] Establish a motion error model

[0026] For coordinates (X 0 ,0,Z 0 )P 0 Point, the slant distance equation for SAR imaging of high-speed mobile aircraft is as follows:

[0027] R ( η ) = [ X ( η ) - X 0 ] 2 + [ h 0 + Y ( η ) ] 2 + Z 0 2 - - - ( 1 )

[0028] In formula (1)

[0029] X ( η ) = V X η + 1 2 a X η 2 Y ( η ) = V Y η + 1 2 a Y η 2 - - - ( 2 )

[0030] Among them, η is slow time; h 0 , V X , A X , V Y , A Y They are the carrier height at the slow time η=0, the carrier's velocity component along the X axis, the carrier's acceleration component along the X axis, the carrier's velocity component along th...

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Abstract

The invention discloses a motion compensating method applicable to high-speed-mobile-aircraft-mounted SAR (synthetic aperture radar) imaging. The motion compensating method includes: establishing a motion error model applicable to high-speed-mobile-aircraft-mounted SAR imaging according to characters of high-speed-mobile-aircraft-mounted SAR imaging; on the basis of the model, analyzing influence on SAR imaging from an inertial navigation error; after distance-direction processing and initial direction Deramp processing are finished, utilizing inertial navigation information and combining with Doppler frequency estimation to obtain residue Doppler frequency modulation information of an echo, utilizing the obtained residue Doppler frequency modulation information to construct a corresponding compensating function to reasonably compensate an error phase, and thereby focusing quality of high-speed-mobile-aircraft-mounted SAR images is effectively improved.

Description

Technical field [0001] The invention belongs to the field of electronic technology and relates to a motion compensation method suitable for SAR imaging of high-speed maneuvering aircraft. Background technique [0002] Compared with optical systems, synthetic aperture radar (SAR) has the advantages of all-weather, all-weather and long range. For high-speed maneuvering aircraft, such as missiles, aerospace aircraft, etc., high-resolution microwave images containing characteristic landforms can be obtained through SAR imaging, and they can be matched with the reference images stored in the database to calculate the aircraft position coordinates from geometric relations , To achieve the purpose of correcting the cumulative error of the inertial navigation and improving the accuracy of the guidance. Therefore, the research of SAR imaging method on high-speed maneuvering aircraft has important practical significance. [0003] For high-speed maneuvering aircraft-borne SAR imaging, the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 包敏文珺李亚超周松史林
Owner XIDIAN UNIV
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