Long life portable global position system receiver

Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit

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Details

455 121, 455 383, H04B 116

Patent

active

054487730

ABSTRACT:
A global positioning system (GPS) receiver having a radio frequency (RF) circuitry to receive position signals from a plurality of satellites and to provide an intermediate frequency (IF) signal to a correlator circuitry for generating a pseudo range and a Doppler measurement for calculating a position fix. The GPS receiver further has a power supply system which has at least one battery and an alternative external power connector for connecting to an external power source. The GPS receiver further has a microprocessor having a read only memory (ROM). The microprocessor is electrically connected to the RF circuitry and the power supply system. Since the GPS receiver does not need to constantly process all the GPS position signals that are available to it to provide a useful tool, the ROM includes a program for automatically controlling the power supply to the RF circuitry so that battery power is conserved.

REFERENCES:
patent: 4755816 (1988-07-01), DeLuca
patent: 4962523 (1990-10-01), Tanaka
patent: 5095308 (1992-03-01), Hewitt
patent: 5101510 (1992-03-01), Duckeck
patent: 5119504 (1992-06-01), Durboraw, III
patent: 5161255 (1992-11-01), Tsuchiya
patent: 5204986 (1993-04-01), Ito et al.
patent: 5222242 (1993-06-01), Ando et al.

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