LEO satellite Tracking and First Acquisition by Old TLE and Extended Kalman Filter

In this paper, a novel method is proposed for first acquisition of a LEO satellite and conical scan tracking of it using one-month old TLE and received telemetry signal strength from satellite using extended Kalman filter. First, the satellite movement trajectory will be described in AZ-EL and LAT-LON coordinate, and the relation between these two coordinates will be determined. Furthermore, it will be shown that satellite first acquisition in AZ-EL coordinates can be achieved precisely by path error modification in LAT-LON coordinates. Subsequently, the changes of tracking error along azimuth and elevation, ngitude, altitude and time will be estimated as system state variables using extended Kalman filter and output of conical scan. Minimizing biases along longitude, altitude and time leads to reduced output, which is defined as the difference between real and estimated paths in AZ-EL coordinates. The performance of the proposed algorithm is evaluated through simulation of real data.

کلیدواژه ها:

First Acquisition ، LEO Satellite ، Extended Kalman Filter ، Az-El and LAT-LON Coordinate