CROSS-MODULATION INTERFERENCE AVOIDANCE FOR ENHANCED PERFORMANCE OF DEEP SPACE TELEMETRY SYSTEMS

Abstract

In this paper we investigate the performance degradation of the NASA Deep Space Network (DSN) telemetry receiving system for two data channels in the presence of cross-modulation interference. It is shown that the sub-carrier waveforms and/or frequencies can be selected to suppress the cross-modulation interference for enhanced deep-space telemetry performance. The application of this study is suggested for a simultaneous telemetry and ranging as well as telecommand and ranging operations. Recommendations as to use of specific subcarrier waveforms and frequencies to suppress cross-modulation interference are made to the international Consultative Committee for Space Data Systems (CCSDS) for consideration in the future standards systems.