Distributed Satellite Sar Slowly Moving Target Detection And Key Technologies

SAR can operate at all weather and all time, and it also has certain capability of penetrating to some vegetation, which makes it widely used in many national economy aspects such as disaster and circumstance monitoring, so it is a very important instrument of space remote sensing. Distributed satellite SAR system is a new concept SAR system, which is combined with several satellites. The satellites work together to accomplish one or more tasks, which has equivalent function with a big satellite. The multi-satellite combination can improves system performances, add new functions, get advanced live capability, and supply more baseline combination. It can be realized by scale production, decreasing launch expense and circulating cost of the satellites.This dissertation mainly researches the along track interferometric SAR technology in the distributed satellite system, and the contributions are calculated as following.The Doppler history is analyzed of the spaceborne bistatic SAR, Doppler center frequency and Doppler FM rate computational methodsm are studied. Profits from the single SAR echo signal model, combines with the spaceborne bistatic SAR character.Set up the model of the micro satellites going with the primary, deduced particularly the velocity formula. Proposed one kind based on the slanting processing ATI algorithm to detect moving target, which reduced the operand, enhanced the operating speed.Analyzed the ATI technique in the influence of clutter and noise. First we analyze the influence of clutter to the interferometric phase, then the distribution of the phase and amplitude, and the CNR to false alarm. In this fundamental we compare the phase threshold only and the dual-threshold algorithm. Proposed one kind of auto-adapted threshold examines method.The dissertation analyzed in brief the influence of all kinds of error to ATI. Because the antennas were put in different platform, the model has inherent error. Analyzed the coupling phase because of the position offset and the influence to the velocity. Analyzed the influence of the gesture change of the satellite to the phase and brought forward the requirement to the gesture control. Analyzed the influence of the carry frequency and PRF error. Analyzed the influence of sphere effect of the Earth and amend the velocity formula. Analyzed the influence of the moving error of antennas...