Abstract
Abstract With the development of modern aerospace technology, radar target altitude become lower and lower, so the low-altitude targets quick and accurate location defense system has become urgent to solve. The radar was looking down on the general situation of low altitude targets, if the Earth is considered as a sphere in the wave refraction correction, it will have great error. In this paper, the radar measurement parameters and geodetic coordinate conversion to space coordinate, the calculation method is given with the radar beam radiation at any point corresponding to the Earth's radius.
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