An S-Band, Multi-Channel, Phase-Coherent Transponder for the Goddard Range and Range Rate Tracking System

This paper describes an S-band, multi-channel transponder which is utilized in the Goddard Range and Range Rate Tracking System for extremely accurate orbital or trajectory tracking of spacecraft from near-earth to lunar distances. A short general description of the system operation and capabilities will be presented. A detailed definition of the physical and electrical configuration of the transponder plus a discussion of the operating characteristics and design problems will follow.