A real-time motion compensation method for ultra-wideband synthetic aperture radar

A technology of synthetic aperture radar and motion compensation, applied in the field of UWBSAR signal processing

Active Publication Date: 2011-12-21
NAT UNIV OF DEFENSE TECH
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  • A real-time motion compensation method for ultra-wideband synthetic aperture radar
  • A real-time motion compensation method for ultra-wideband synthetic aperture radar
  • A real-time motion compensation method for ultra-wideband synthetic aperture radar

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[0070] The specific implementation manners of the present invention will be further explained in detail below in conjunction with the accompanying drawings.

[0071] figure 1 It is a flow chart of the UWB SAR real-time motion compensation method based on single-point GPS. During UWBSAR imaging, press the time-of-flight to T a Segmentation, if the current moment is the starting point of the imaging synthetic aperture, then establish the imaging coordinate system, if not, proceed to figure 1 The steps are as follows: the first step is to eliminate the single-point GPS position jump error; the second step is to calculate the translational motion error according to the single-point GPS positioning information. The third step is to calculate the heading speed error. For the specific method of real-time PRF adjustment adopted in the present invention, see the literature: Li Jianyang et al., "UWB SAR real-time PRF adjustment", Modern Radar, 2009, Volume 31, No. 4, p34-p37; The fou...

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Abstract

The invention provides a real-time motion compensation method for an ultra-wide band synthetic aperture radar (UWB SAR), which is characterized in that motion parameters output by a single-point global positioning system (GPS) are used for carrying out real-time motion compensation of the UWB SAR, the flight time is segmented according to Ta, when the current moment is a starting point of an imaging synthetic aperture, an imaging coordinate system is built, and if not, the next steps are carried out: step 1, eliminating the single-point GPS position jumping errors; step 2, calculating the transverse motion errors according to the single-point GPS positioning information; step 3, calculating the heading speed errors; and step 4, calculating the sight line direction motion errors and compensating the motion errors in the airborne UWB SAR sight line direction. In the method of the invention, the information processing is only carried out on the output data of a navigation system, the motion parameter evaluation does not need to be carried out, the storage space and the calculation quantity are saved, and the large-area imaging compensation precision is high. In addition, the cost is low, and the realization is easy.

Description

technical field [0001] The invention belongs to the technical field of UWB (Ultra Wide Band, ultra-wide band) SAR (Synthetic Aperture Radar, synthetic aperture radar) signal processing, relates to a kind of UWB SAR real-time motion compensation method, particularly uses GPS (Globe Positioning System, global positioning system) output A method for real-time motion compensation of UWB SAR based on motion parameters. Background technique [0002] UWB SAR refers to the SAR with the relative bandwidth of the radar system signal greater than 25%. Since the relative bandwidth is equal to the ratio of the transmitted signal bandwidth to the center frequency of the radar system, UWB SAR is usually located in the UHF / VHF band and belongs to the low-frequency SAR. UWB SAR also has penetration Leaf clusters and shallow surface imaging capabilities are currently one of the research hotspots in the field of SAR. UWB SAR needs a large accumulation angle to obtain high resolution in azimut...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 李悦丽周智敏黎向阳黄晓涛朱国富严少石李建阳安道祥
Owner NAT UNIV OF DEFENSE TECH
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