A Timing Determination Method for Ultra-high Resolution Spaceborne SAR System
An ultra-high-resolution and deterministic technology, applied in the field of space microwave remote sensing, can solve the problems of inability to achieve ultra-high-resolution imaging, loss of echo information, mutual interference, etc., achieve accurate transmission pulse interval, achieve complete reception, avoid the effect of interference
Active Publication Date: 2017-11-07
XIAN INSTITUE OF SPACE RADIO TECH
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However, in the ultra-high-resolution spaceborne SAR system, the long-distance migration characteristics of the echo will inevitably cause interference between it and the transmitted pulse, which will cause the loss of echo information and make it impossible to achieve ultra-high-resolution imaging
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[0059] The working process of the present invention will be further explained and illustrated below in conjunction with the accompanying drawings.
[0060] Such as figure 1 As shown, a method for determining the timing of an ultra-high resolution spaceborne SAR system of the present invention comprises the following steps:
[0061] (1) Determine the range time range of the scene echo at the initial moment, and obtain the initial transmission pulse interval according to the range;
[0062] The specific way to determine the range time range of the scene echo at the initial moment is as follows:
[0063] (1a) According to the satellite-ground geometric relationship of spaceborne SAR, the azimuth beam width θ of the antenna beam az , scene azimuth length L a And finally to achieve azimuth resolution ρ a , to calculate the azimuth rotation range of the antenna beam in the sliding beamforming mode: by θ a_max Rotate to -θ a_max ;
[0064] (1b) Calculate the minimum action dis...
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The invention discloses a time sequence determining method of an ultra-high resolution satellite-borne SAR system. The time sequence determining method comprises the steps of: determining a distance migration range of scene echoes according to satellite-borne SAR and geometric information of an observation scene; determining an initial pulse transmitting interval by combining a satellite-borne SAR system wave position graph and an echo distance time range at the initial time; then continuously changing the pulse transmitting interval based on a minimal time unit which can be generated by a timer according to the distance migration trend of the scene echoes, and ensuring that the scene echoes effectively avoids transmitting interference; and combining the system wave position graph again to perform a step type hopping on the transmitting interval if the transmitting interval adjusted based on the minimal unit cannot avoid transmitting interference at a moment in the process, adjusting the echoes to other transmitting pulse intervals, and continuing the adjustment of the transmitting interval according to the minimal time unit amount. The time sequence determining method designs working time sequence based on the steps, and can ensure that the echoes are received integrally during the whole working time.
Description
technical field [0001] The invention relates to a method for determining the working time sequence of an ultra-high resolution space-borne SAR system, and belongs to the technical field of space microwave remote sensing. Background technique [0002] In the application of spaceborne SAR for ground imaging military reconnaissance, the resolution will directly determine the reconnaissance effect on military areas and targets. According to the principle of SAR imaging, in order to obtain two-dimensional high-resolution images, on the one hand, it is necessary to increase the emission bandwidth to achieve high resolution in the range direction, and on the other hand, it is necessary to increase the bandwidth of the synthetic aperture to improve the resolution in the azimuth direction. The increase of the transmission bandwidth requires the use of a large-diameter antenna to ensure the image signal-to-noise ratio, and the large-diameter antenna determines that the beam width of t...
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IPC IPC(8): G01S7/02G01S7/282G01S13/90
CPCG01S7/023G01S7/282G01S13/90G01S13/9004
Inventor 冯帆党红杏谭小敏孙嘉杨娟娟高阳金阿鑫杨绪
Owner XIAN INSTITUE OF SPACE RADIO TECH