On-orbit test method for space-borne sliding spotlight SAR aiming precision

Abstract

The invention discloses an on-orbit test method for space-borne sliding spotlight SAR aiming precision. The method comprises the following steps: choosing a ground control point whose absolute position coordinate is Ptarget0; according to the current orbital position of the satellite PSatellite0, forecasting the orbital position PSatellite1 (WGS84 coordinate system) of the control point at the covering time; performing calculations to the SAR imaging related parameters; based on the imaging parameters, calculating the relative position PRelative0 of the control point in an imaging band; covering by the satellite and irradiating to the known control point and downloading data; receiving the data by a ground application system and carrying high precision Doppler center computing and imaging processing; conducting geometrical positioning to the image by the ground application system based on the navigation data and the ephemeris parameters; intercepting the image according to the imaging bandwidth design value; and identifying the already known control point on the image; calculating the relative position coordinate PRelative1 in a scene. The invention can effectively solves the on-orbit test and evaluation on the space-borne sliding spotlight SAR aiming precision and can effectively ensure the accuracy for the user to obtain the SAR image of a required target.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an on-orbit test method for the aiming accuracy of a spaceborne sliding spotlight SAR. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) is an all-weather and all-weather active earth observation system, which has played an important role in land and resources census, surveying and mapping, and disaster prevention and mitigation. Since entering the 21st century, spaceborne SAR technology has developed rapidly. The resolution of spaceborne SAR is getting higher and higher. Germany's TerraSAR satellite has a maximum resolution of 1 meter, and Italy's Cosmo-skymed has a resolution of 1 meter. Due to the contradiction between the resolution and the imaging bandwidth, the increase of the resolution causes the width of the imaging bandwidth to decrease (the imaging bandwidth of the 1-meter resolution mode of TerraSAR satellite is only 5 kilometers). The s...

AI Technical Summary

Problems solved by technology

The above research is limited to the analysis of factors affecting targeting accuracy, and the on-orbit test method of individual influencing factors

As for the complete on-orbit test method of aiming accuracy, and the means of comprehensively and systematically analyzing and evaluating the aiming accuracy from the satellite to the ground link, we have not yet seen it.

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