GPS Review Exam Questions & Answers 2024

GPS Review Exam Questions & Answers 2024 ephemeris - ANSWER-received navigation message to learn satellite location 3 types of ephemeris - ANSWER-GPS almanac Broadcast ephemeris IGS orbit Almanac - ANSWER-Broadcast by every SV, for full constellation USAF WGS84 Accuracy of several km depending on age, and latency of real time Broadcast - ANSWER-Every SV broadcasts its own USAF and WGS 84 accuracy: +/- 100cm clock: ~5ns latency real time Almanac continued - ANSWER-Every GPS satellite transmits includes info on: 1. The state/health of the entire GPS satellite constellation, 2. Coarse orbit data for every satellite Each Satellite broadcast Almanac data for all satellites Provides low accuracy, can be used from up to several months