GPS simulator
All three segments of GPS.
The satellites transmit, the ground segment keeps them accurate, and the receiver turns their signals into a position. The satellite simulator can export a recording that the receiver plays back.
GPS satellite and constellation
The transmit side: the constellation on a 3-D globe, coverage and DOP, each satellite's signal chain from its atomic clock to BPSK on L1, L1/L2/L5 spectra, link budget, and I/Q the receiver can load.
Open Control segmentGPS ground segment
How the control segment keeps GPS accurate: monitor stations, the master control station's Kalman filter, S-band uploads, error growth between uploads, and fault handling.
Open User segmentGPS receiver
A complete GPS L1 C/A software receiver: acquisition, tracking loops, navigation-message decoding and a position fix, stage by stage.
Open