星载雷达高度计OCOG算法的改进

AN IMPROVEMENT ON OCOG ALGORITHM IN SATELLITE RADAR ALTIMETER

The Offset Centre Of Gravity (OCOG) algorithm is a new tracking algorithm based on estimate of the pulse amplitude, the pulse width and the true centre of area of the pulse. It's obviously that this algorithm is sufficently robust to permit the altimeter to keep tracking many kinds of surfaces.Having analysed the performance of this algorithm, it is discovered that the algorithm performs is quit satisfactorily in high SNR environments, but fails in low SNR environments. The caase of the degradation of it's performance is studied and it is point ed out that to the Brown return model and the sea ice return model, the performance of the OCOG algorithm can be improved in low SNR environments by using noise gate.