Receiver architecture for use with a global positioning system

Details Receiver architecture for use with a global positioning system Receiver architecture for use with a global positioning system

1989-11-30

1991-08-13

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455264, 455315, 342356, 342357, 364444, 364449, H04B 700

Patent

active

050402404

ABSTRACT:
A demodulation frequency plan for use in a global positioning system (GPS) receiver, having three demodulation stages for L1 and L2 signal channels, in which identical local oscillator frequencies are used in the L1 and L2 channels at each demodulation stage, to minimize phase error differences between the two channels. The third stage provides an output at an intermediate frequency high enough to carry the full information bandwidth, thereby simplifying digital sampling of the signal, which is also performed in the third stage. Sampling is performed at a high enough rate to facilitate subsequent conversion to baseband. Moreover, the sampling rate is a binary multiple of the intermediate frequency, and this binary relationship further simplifies conversion to baseband.

REFERENCES:
patent: 3887794 (1975-06-01), Katz et al.
patent: 4063173 (1977-12-01), Nelson et al.
patent: 4476585 (1984-10-01), Reed
patent: 4580289 (1986-04-01), Enderby
patent: 4785463 (1988-11-01), Jane et al.

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