A Method of Attitude Guidance for Spaceborne Geosynchronous Orbit Synthetic Aperture Radar
A geosynchronous orbit, synthetic aperture radar technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the high requirements of platform attitude control system, large steering angle, large steering angle, etc. question
Inactive Publication Date: 2015-12-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
In GEOSAR, yaw guidance can effectively reduce the deterioration of ground distance resolution, but the required guidance angle is large, and the requirements for the platform attitude control system are high
All zero Doppler steering not only requires a larger steering angle, but also cannot reduce the degradation of ground distance resolution
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[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0033] The present invention provides a space-borne geosynchronous orbit synthetic aperture radar attitude guidance method. Firstly, according to the known orbital parameters, downward angle of view and other conditions, the expressions of satellite velocity direction and ground distance resolution ellipse area are obtained. Then, according to the expression of the ground-distance resolution ellipse area, the optimal azimuth angle required to realize the minimum resolution ellipse area is solved. Finally, through pitch and roll guidance or roll and pitch guidance, the beam is directed to the direction of the above-mentioned optimal azimuth angle, such as figure 1 shown. Specific steps are as follows.
[0034] Step 1. Determine the satellite velocity direction and ground distance resolution ellipse area according to the orbital parameters and the downward...
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The invention discloses a satellite-borne geosynchronous orbit synthetic aperture radar posture guiding method. Optimal ground range resolution can be achieved by using a small posture guiding angle through the utilization of the satellite-borne geosynchronous orbit synthetic aperture radar posture guiding method. According to the satellite-borne geosynchronous orbit synthetic aperture radar posture guiding method, firstly, the expression of a satellite speed direction and a ground range resolution ellipse area is obtained according to the conditions of given orbital parameters, downwards angles of visibility and the like; then the optimal azimuth angle of the optimal ground range resolution is worked out by utilizing the optimal solution when the ground range resolution ellipse area is minimum; finally, a wave beam is made to point to the direction where the optimal azimuth angle locates through pitching roll guiding or roll pitching guiding, the posture guiding of the optimal resolution is completed, and the posture guiding angle is small.
Description
technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a method for guiding the attitude of a spaceborne geosynchronous orbit synthetic aperture radar. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather high-resolution microwave remote sensing imaging radar that can be installed on aircraft, satellites, spacecraft and other flying platforms. It has unique advantages in environmental monitoring, ocean observation, resource exploration, crop yield estimation, surveying and mapping, and military applications, and can play a role that other remote sensing methods are difficult to play. For such a wide application of SAR, its application quality generally depends on the image resolution of SAR. [0003] Space-borne geosynchronous orbit (GEO) synthetic aperture radar refers to a synthetic aperture radar located in geosynchronous orbit and using satellites as carriers. Spaceborne G...
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IPC IPC(8): G01S7/02
CPCG01S7/02G01S13/90G01S13/9058
Inventor 丁泽刚曾涛尹伟龙腾张庆君朱宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY