An improved conical scaning tracking method in Satellite Communication Systems

Abstract

Shipborne satellite earth stations will cause feed vibrations when the conical scanning frequency is too high under low dynamic conditions, which will cause large fluctuations in the received signal strength of the earth station in a relatively stationary environment. And too low conical scanning frequency will cause the earth station Lost the target satellite in a high dynamic environment. The tracking system adopts adaptive speed regulation strategy and initial phase estimation algorithm, and adjusts the frequency of cone scanning in real time according to the motion attitude of earth station measured by IMU, so that the earth station can adapt to different dynamic environment. In practical engineering, a Ku band tracking system of ship borne satellite earth station is designed and implemented based on FPGA. The actual test results show that the signal fluctuation of the improved cone scanning algorithm is about 2dbm lower than that of the cone scanning algorithm with a fixed frequency of 50Hz.