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Receiver noise: Difference between revisions

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::[[File: Signal_Structure_Table.png |none|480px| '''''Table 1: GPS signal structure (source: G. Seeber p. 217)]]
::[[File: Signal_Structure_Table.png |thumb|none|480px| '''''Table 1: GPS signal structure (source: G. Seeber p. 217)]]
The carrier phase noise is at the level of few millimetres (about the 1% of carrier phase wavelength).
The carrier phase noise is at the level of few millimetres (about the 1% of carrier phase wavelength).



Revision as of 10:46, 5 August 2011


FundamentalsFundamentals
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
Logo gAGE.png


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 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 C/A receiver noise can be reduced down to about 50 cm.


Table 1: GPS signal structure (source: G. Seeber p. 217)

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.