Frequency translation method and circuit for use in GPS antenna

Details Frequency translation method and circuit for use in GPS antenna Frequency translation method and circuit for use in GPS antenna

1997-11-17

1999-03-16

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

375200, G01S 502, H04B 1500

Patent

active

058835970

ABSTRACT:
Provided are a method of and a circuit for processing GPS signals in the L1 frequency band centered around frequency f.sub.L1 and GPS signals in the L2 frequency band centered around frequency f.sub.L2. The L1 frequency band signals are combined with the L2 frequency band signals to obtain a combined signal having both an L1 frequency band component and an L2 frequency band component. The combined signal is frequency converted by mixing it with a local oscillator signal centered around a frequency f.sub.L0 to obtain a frequency converted combined signal centered around a third center frequency f.sub.C3. The frequency converted combined signal is filtered to provide an output signal having substantially all of its components centered around the third center frequency f.sub.C3. The frequency f.sub.L0 of the local oscillator signal is selectively controlled to thereby control whether the output signal contains frequency components corresponding to only the L1 frequency band signal, to only the L2 frequency band signal, or to both of the L1 and L2 frequency band signals.

REFERENCES:
patent: 5036330 (1991-07-01), Imae et al.
patent: 5101416 (1992-03-01), Fenton et al.
patent: 5245628 (1993-09-01), LaPadula, III et al.
patent: 5293270 (1994-03-01), Lorenz et al.
patent: 5678169 (1997-10-01), Turney
patent: 5736961 (1998-04-01), Fenton et al.

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