Method for constructing spaceborne SAR signal high precision phase-keeping imaging processing platform

A technology of imaging processing and construction methods, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.

Active Publication Date: 2010-03-31
BEIHANG UNIV
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Problems solved by technology

In view of the fact that the existing space-borne SAR imaging algorithms have not fully considered the special requirements of InSAR processing for phase-pr

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  • Method for constructing spaceborne SAR signal high precision phase-keeping imaging processing platform
  • Method for constructing spaceborne SAR signal high precision phase-keeping imaging processing platform
  • Method for constructing spaceborne SAR signal high precision phase-keeping imaging processing platform

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[0161] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0162] figure 1 It is a schematic diagram of space-borne distributed satellite SAR interferometric altimetry. As the best working mode at present, this system has become one of the research "hotspots" in the field of InSAR system technology.

[0163] figure 2 It is the flow chart of spaceborne InSAR signal processing. The processing flow can be roughly divided into the following steps: (1) imaging processing (2) image registration (3) image interference (4) phase unwrapping (5) elevation inversion (6) geometric correction.

[0164] image 3 It is a schematic diagram of the frequency domain amplitude and phase characteristics of the all-pass phase network, which is used to compress the FM signal.

[0165] The present invention mainly aims at the problem that it is difficult to maintain phase accuracy in spaceborne SAR signal processing, and propos...

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Abstract

The present invention provides a method for constructing spaceborne SAR signal high precision phase-keeping imaging processing platform, comprising the following steps: 1) solving the spaceborne SAR data imaging processing parameters; 2) reading spaceborne SAR echo data in frame and storing in the form of two dimension complex array; 3) performing Fast Fourier Transform in the oriental direction;4) carrying out Doppler centroid circular shifting in the range-Doppler domain; 5) signal interpolating in range-Dopper domain; 6) performing Fast Fourier Transform in the distance direction; 7) performing distance migration correction and compression on data in wave-number domain, finishing focusing in distance direction and compensating residual complex constant phase terms; 8) performing FastInverse Fourier Transform in the distance direction; 9) focusing in oriental direction in range-Dopper domain and compensating residual complex constant phase terms; and 10) performing Fast Inverse Fourier Transform in the oriental direction and compensating linear phase error caused by circular shifting. The method can fast and flexibly finish the phase keeping-imaging processing of SAR signal.

Description

(1) Technical field [0001] The invention belongs to the field of radar signal processing, and relates to a construction method of a space-borne synthetic aperture radar (Synthetic Aperture Radar, SAR) signal high-precision phase-preserving imaging processing platform, in particular to a high-precision phase-preserving algorithm based on Chirp Scaling (CS) imaging processing Information (phase-preserving) spaceborne SAR signal processing method. (2) Background technology [0002] Synthetic Aperture Radar (SAR) satellite system technology has developed very rapidly in recent years. Since SAR satellites are not limited by factors such as weather, geography, and time, they can achieve all-day and all-weather earth observation tasks, and have certain penetration capabilities, so they are widely used in military reconnaissance, resource detection, and ocean observation. , ecological monitoring and rapid rescue. [0003] The traditional SAR system has two-dimensional high-resolut...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 陈杰杨威李春升
Owner BEIHANG UNIV
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