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The SATRACK System - rishabh_jaina - 10-04-2017 The SATRACK System: Development and Applications INTRODUCTION SATRACK was developed to validate and monitor the Trident missile guidance error model in the System Flight Test Program. It is the primary instrumentation and processing system responsible for accuracy evaluation of the Navy s Strategic Weapon System. Instrumentation and processing systems available when the Trident Development Program began could not meet this need. APL conceived and led the development of the SATRACK system to fulfill this requirement. Prototype instrumentation required for the missile and ground station data collection functions were developed at APL to validate the concept, and we generated specifications controlling the development of the operating missile and ground station hardware. BASIC CONCEPTS The SATRACK concept is shown in Fig. 1. Signals from GPS satellites are relayed by the test missile to receiving equipment at a launch-area support ship (LASS) and a downrange support site (DRSS). At the beginning of the Trident Flight Test Program a ship was used for downrange support; now that support is provided by a land station. The missile hardware was called a translator to emphasize that no signal tracking functions are accomplished in the missile (i.e., the signals are simply translated to S-band and retransmitted). SATRACK EVOLUTION SATRACK I The C4 missile design was well under way before it was decided to implement the SATRACK system. The proposed design approach did minimize the required additional missile electronics and it did take advantage of the existing S-band antenna; however, a new GPS antenna had to be added. The C4 design constraints held the GPS antenna configuration to four elements spaced uniformly around the missile circumference. SATRACK II The development of the Trident II (D5) missile began in 1981. To support this development, APL conducted the Accuracy Evaluation System study. That study supported development of the technical objectives and guidelines document that defined the accuracy evaluation requirements for the D5 Missile Flight Test Program. The SATRACK II requirements, defined by the Accuracy Evaluation System study, included significant performance enhancements. |