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High speed precision pseudo random noise shift control for fast multiple channel global positioning system signal re-tracking

  • US 7,184,461 B2
  • Filed: 03/13/2001
  • Issued: 02/27/2007
  • Est. Priority Date: 03/13/2000
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • a control circuit to generate a channel enable signal based on control information from a processor at a first clock signal having a first clock frequency, the channel enable signal selecting a channel for a satellite in a global positioning system (GPS), the channel operating at a coarse/acquisition (C/A) clock signal having a second clock frequency, the control information including at least one of channel select information, an initial count, an increment value, and PN command;

    an increment register to store the increment value for the selected channel at the first clock signal; and

    an accumulator coupled to the increment register and the control circuit to generate a PN clock signal using the increment value;

    wherein the control circuit comprises;

    a decoder to decode the channel select information, the decoded channel select information providing the channel enable signal;

    a channel enable register coupled to the decoder to store the channel enable signal at the first clock signal;

    a counter coupled to the channel enable register to update a count from the initial count at the first clock signal, the counter generating a terminal signal when the count reaches a terminal count; and

    a logic circuit coupled to the counter and the channel enable register to generate a load signal from the PN command to load the initial count to the counter and a reset signal from the terminal signal to reset the channel enable register.

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