Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-05-04
2000-09-19
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 121, 455552, 455553, H04Q 720
Patent
active
061225061
ABSTRACT:
A GPS/GSM receiver combination for receiving GSM and GPS signals using an RF GPS integrated circuit for downconverting the GPS signal. The GPS integrated circuit includes a synthesizer for generating LO signals, first and second downconverters for using the LO signals for downconverting the GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signal. The synthesizer includes a multi-mode divider for providing substantially the same first LO frequency at about the midpoint of the L1 and L2 GPS frequencies when either of a standard GSM reference frequency or historically common GPS reference frequency is selected. A standby mode in the integrated circuit is controlled by a power logic circuit using a power supply input as a logic control signal. The GSM/GPS receiver combination includes a GSM reference oscillator and a microprocessor system including a GSM frequency correction code for correcting the GSM reference frequency based upon a frequency correction beacon (FCB) signal received in the GSM signal. The GSM-based correction is then used for correcting the GSM reference frequency in order to center a frequency search for acquiring the GPS signal.
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patent: 5841396 (1998-11-01), Krasner
patent: 5877724 (1999-03-01), Davis
Lau Chung Y.
Parker Reed A.
Rodal Eric B.
Bost Dwayne D.
Gildea David R.
Trimble Navigation Limited
Vuong Quochien B.
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