A GEO Satellite Position and Beam Features Estimation Method Based on Beam Edge Positions

Constrained by orbital configuration and spectrum sharing, non-geostationary orbit (NGEO) satellites may be interfered when they are in the beam range of geostationary orbit (GEO) satellite. However, it is difficult for NGEO operators to determine the signal source. Herein, we propose a method to locate the GEO signal source and estimate beam features, including beam pointing azimuth, elevation, and beamwidth, by the beam edge positions. We transform this estimation problem into two optimization problems by minimizing the estimation error, and solve both of them through a multi-variable joint iteration method with acceptable computation complexity. Numerical results show that when NGEO satellites pass through the beam twice, the longitude estimation error is about 0.01 degree, and the estimation results will be more and more accurate as the number of passing times increases. Besides, the proposed method is also effective when there are kilometer-level errors in beam edge positions.