International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / This paper analyzes the multi-path effects on telemetry equipment when it tracks the low-elevation flying target. Based on bias-axis mono-pulse technique, real time attenuation memory recursive Least-Squares Estimate as well as synthetic application of multiple source data, a comprehensive tracking method is proposed to eliminate the antenna shaking and reduce angle error caused by the multi-path effects. The method has been verified by field test. And the goal of smooth tracking of the low elevation target is eventually reached.

ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California / This document is focused on the examination of the tracking angular error due to the radio refraction for the target in low altitude of less than 5km and in low elevation angle. The real measured data using the GPS and the tracking systems of C- and S-band frequency in NARO Space centre, Korea are used for the analysis. The analysis shows couple of conclusions on the radio refraction effects; there are angular errors due to the radio refraction which is not to be neglected comparing the accuracy of the tracking system but to be considered for the precise measurement of the target position. Also, the refraction errors are dependent on the target altitude, but not on the frequency.