GPS L2C positioning error of one million meters

[SatelliteCoder]

Hello, thank you very much for your project. It has been of great help to my studies.However, I recently tested the GPS L2C band signal using the GNSS‑SDR software receiver and found that the positioning accuracy is off by about one million meters.I don’t know what the problem is. Could you please explain why this happens?The set latitude, longitude and height are 30, 120 and 100 respectively, and the positioning results are shown in the figure below.

[globsky]

I'd suggest you better check the raw measurements first. You can compare it with the output of JsonObsGen application as reference, then find out the problem.

[SatelliteCoder]

What is the normal positioning accuracy range for simulated GPS L2C signals in meters?

[globsky]

It depends on the ionosphere/troposphere delay model whether uses the same as SignalSim. Generally if they are exactly the same, the observation accuracy should be under millimeter.