Receiver phase-noise mitigation

Details Receiver phase-noise mitigation Receiver phase-noise mitigation

1998-09-15

2000-06-27

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

701214, 455296, H04B 7185, G01S 502

Patent

active

060812281

ABSTRACT:
A Global Positioning System receiver incorporating a method of reducing the effect of common mode oscillator phase noise. Oscillator phase noise in the receiver is a basic limitation on narrowing the carrier tracking loop bandwidth and, therefore, on the achievable carrier-track C/No for a GPS receiver tracking a single satellite signal. However, when receiving several satellite signals, the receiver phase noise is common to all tracking loops and, in principle, can be removed by a common-mode rejection scheme. The phase noise contributed by the satellites is negligible in comparison with the phase noise contributed by the receiver's oscillator; hence, the common-mode rejection is improved by tracking multiple satellite signals.

REFERENCES:
patent: 4675880 (1987-06-01), Davarian
patent: 5793818 (1998-08-01), Claydon et al.
patent: 5901183 (1999-05-01), Garin et al.
Barnes, "Characterization of Frequency Stability" IEEE Transactions on Instrumentation and Measurement, May 1971, pp. 105-120.

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