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System and method for receiving digital satellite radio and GPS

  • US 7,904,110 B2
  • Filed: 05/17/2002
  • Issued: 03/08/2011
  • Est. Priority Date: 05/17/2001
  • Status: Active Grant
First Claim
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1. A combined Global Positioning System (“

  • GPS”

    ) and radio system for receiving GPS signals and radio signals, the combined GPS and radio system comprising;

    a switchable frequency source to generate a frequency reference signal having a first switch state of operation that corresponds to receiving GPS signals and a second switch state of operation that corresponds to receiving radio signals;

    a mixer in signal communication with the switchable frequency source, the mixer is capable of receiving both GPS signals and radio signals and producing corresponding intermediate frequency (“

    IF”

    ) signals in response to receiving the frequency reference signal; and

    a controller to control the switchable frequency source to periodically switch between the first switch state of operation and the second switch state of operation at a duty cycle determined to resolve a position of the combined GPS and radio system based on the received GPS signals.

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