×

Efficient epoch processing in multichannel global positioning system signal receiver

  • US 7,173,957 B2
  • Filed: 03/13/2001
  • Issued: 02/06/2007
  • Est. Priority Date: 03/13/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus comprising:

  • a mixer circuit to mix a de-spreaded sample with coefficients to generate a mixer sample at a first clock frequency, the de-spread sample being provided by a de-spreader circuit for a signal received from one of N satellites in a global positioning system (GPS), the de-spread sample includes de-spread in-phase and de-spread quadrature components, each component having 6 bits, the mixer sample including mixer in-phase and quadrature components, the mixer circuit comprising;

    an in-phase circuit to generate the mixer in-phase component based on a first complex multiplication on the de-spread in-phase and quadrature components and the sine and cosine values, the mixer in-phase component having 8 bits, and a quadrature circuit to generate the mixer quadrature component based on a second complex multiplication on the de-spread in-phase and quadrature components and the sine and cosine values, the mixer quadrature component having 8 bits;

    a look-up table coupled to the mixer circuit to generate the coefficients based on a carrier numerically controlled oscillator (NCO) value, the coefficients including sine and cosine values, each value having three bits; and

    a carrier NCO coupled to the look-up table to generate a carrier NCO value.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×