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Receiver noise
| Fundamentals | |
|---|---|
| Title | Receiver noise |
| Author(s) | J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain. |
| Level | Medium |
| 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 [math]\displaystyle{ 1\% }[/math] of the wavelength ("chip"), or better. This means, for instance, a noise with a maximum value of [math]\displaystyle{ 3\,m }[/math] for the GPS civil C/A code and about [math]\displaystyle{ 30\, cm }[/math] for the protected P codes (see table 1).However, when smoothing the code with the carrier phase, the C/A receiver noise can be reduced down to about [math]\displaystyle{ 50\, cm }[/math].
The carrier phase noise is at the level of few millimetres (about the [math]\displaystyle{ 1\% }[/math] of carrier phase wavelength).
Code and carrier phase noise depends on the signal strength, which varies with the elevation angle.