1、Public Lessons Learned Entry: 5188 Lesson Info: Lesson Number: 5188 Submitting Organization: KSC Submitted by: Jenni Palmer Subject: Communications and Tracking Station Abstract: Not using a ground station for primary direct communications between the Tracking and Data Relay Satellite System (TDRSS)
2、 and the Constellation vehicle resulted in various communications problems. Using a ground station to transmit and receive the primary means of communication would have been more reliable. A ground/flight architecture capable of transmitting the forward link and receiving the return link communicati
3、ons should be considered for future programs. Description of Driving Event: The Constellation program opted out of using a ground station for primary communication; instead, choosing to communicate directly with TDRSS for prelaunch, launch, and ascent. Communications with TDRSS from the launch pad p
4、roved to be challenging. Some of the problems experienced were data latency, voice sync difficulties between primary communications and dissimilar voice, and closing the link with TDRSS while transmitting and receiving forward/return link communications. Lesson(s) Learned: Direct communications to T
5、DRSS without a ground link was not reliable. Recommendation(s): For future spacecraft, a ground/flight architecture (selected through additional trade studies) capable of transmitting the forward link and receiving the return link communications to/from the spacecraft during prelaunch, launch, and a
6、scent should be considered. Evidence of Recurrence Control Effectiveness: N/A Documents Related to Lesson: N/A Mission Directorate(s): Exploration Systems Additional Key Phrase(s): Mission Operations and Ground Support Systems Launch support systems Communication Systems Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Additional Info: Project: Constellation Approval Info: Approval Date: 2012-05-11 Approval Name: mbell Approval Organization: HQ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
