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Receiver noise
| Fundamentals | |
|---|---|
| Title | Receiver noise |
| Author(s) | J. Sanz Subirana, J.M. Juan Zornoza and M. Hernández-Pajares, Technical University of Catalonia, Spain. |
| Level | Basic |
| Year of Publication | 2011 |
The receiver code noise is a white-like error and can be smoothed using a low pass filter.
This error affects both the code and carrier measurements, but in different magnitude: The accuracy of pseudorange measurements is about 1% of the wavelength ("chip"), or better. This means, for instance, a noise with a maximum value of 3 m for the GPS civil C1-code (i.e., C/A-code) and about 30 cm for the protected P codes (see table 1).However, when smoothing the code with the carrier phase, the C1-code noise can be reduced down to about 50 cm.
The carrier phase noise is at the level of few millimetres (about the 1% of carrier phase wavelength).
Code and carrier phase noise depends on the signal strength, which varies with the elevation angle.