First BeiDou Phase 3 Signals Acquired

摘要

On Aug. 9, signals from the two new BeidDou satellites were received with a software-defined radio sampler operated at the European Commission's Joint Research Centre in Ispra, Italy.The sampler is driven by orbit-prediction software that triggers a synchronized acquisition on both 1575.42 MHz and 1278.75 MHz using 1 -bit complex samples at 60 megasamples per second (about 60 MHz total bandwidth).The two-line element sets for the orbits were obtained from the CelesTrak website, and predicted positions were computed using code developed following the Simplified General Perturbations Satellite Orbit Model 4 (SGP4) as documented in the U.S. Department of Defense Spacetrack Report No. 3.