GPS simulation for avionics presents challenges because aircraft GPS receivers rely on their last known position and compare new signals against that stored data. Large geographic jumps or long time gaps can prevent the receiver from achieving a 3D lock when using simulators like the VIAVI OSPREY or GPSG‑1000. A warm start, which simply power‑cycles the receiver, may resolve some issues, but more difficult cases require a cold start, which resets the receiver’s memory to clear previous location and time data. These techniques help ensure successful GPS lock during simulated testing.

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