Heterodyne radio receiver with plural variable frequency local o

Details Heterodyne radio receiver with plural variable frequency local o Heterodyne radio receiver with plural variable frequency local o

1994-11-09

1997-02-25

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

4551961, 455260, H04B 126

Patent

active

056067364

ABSTRACT:
A satellite navigation receiver uses common dual-conversion superheterodyne and frequency synthesizer circuitry for receiving signals from both the GPS and the GLONASS satellite navigation systems. Successive first and second frequency down-converters in the receiver chain are fed by first and second local oscillator signals which are both variable in frequency such that the frequency of the first local oscillator signal is an integral multiple (preferably 8) of the second local oscillator signal. This relationship is provided by a binary divider (32) at least a portion of which may form part of a digital frequency synthesizer loop.

REFERENCES:
patent: 3931578 (1976-01-01), Gittinger
patent: 4262361 (1981-04-01), Hauer
patent: 4429418 (1984-01-01), Hooper
patent: 4476575 (1984-10-01), Franke
patent: 4521916 (1985-06-01), Wine
patent: 4580289 (1986-04-01), Enderby
patent: 4944025 (1990-06-01), Gehring et al.
patent: 5040240 (1991-08-01), Keegan
patent: 5163160 (1992-11-01), Foucher et al.
R. A. Eastwood; "An Integrated GPS/GLONASS Receiver"; pp. 37-43; Institute of Navigation Conference; Jan. 23-25, 1990.

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