Back to results
US 6,191,730 B1Granted
Two-channel fast-sequencing high-dynamics GPS navigation receiver
AssigneeTrimble Navigation Limited
InventorRobert Leonard Nelson, Jr.
Life of this patent
Estimating the term…
Abstract
A GPS navigation receiver channel tracks satellites' Doppler frequencies sequentially during the twenty milliseconds that the signal is coherent in each bit time of the navigation data modulation. It measures frequency by differencing the angles of signal-vector sums weighted by parabolic humps, exploiting the commutativity of linear processing operations to raise the signal-to-noise ratio before the nonlinear operation phase of detection.
Claims3
A navigation satellite receiver comprising:
- a first receiver channel or set of channels connected to a radio antenna for demodulating a navigation-data modulation on any of a plurality of radio transmissions from a corresponding plurality of navigation transmitters and for acquiring signals from additional transmitters;
- a second receiver channel or set of channels connected to a radio antenna for sequentially tracking a plurality of radio transmissions from a corresponding plurality of transmitters;
- means for sequencing the second receiver channel or channels for collecting a period of measurements sequentially from each of said plurality of transmitters that coincides with the bit times of said navigation data in which said transmissions are coherent;
- and
- a computing means for measuring the Doppler shift or frequency error.
2 more elements
Dependencies are inferred from the claim text.