Superheterodyne radio receiver

Details Superheterodyne radio receiver Superheterodyne radio receiver

1996-11-14

1998-11-03

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

4551961, 455260, H04B 126

Patent

active

058323759

ABSTRACT:
A satellite navigation receiver uses common dual-conversion superheterodyne and frequency synthesiser 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 synthesiser loop.

REFERENCES:
patent: 4262361 (1981-04-01), Hauer
patent: 4580289 (1986-04-01), Enderby
patent: 5040240 (1991-08-01), Keegan
patent: 5220684 (1993-06-01), Suizu
patent: 5220688 (1993-06-01), Tao
patent: 5606736 (1997-02-01), Hasler et al.

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