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US 6,674,401 B2Granted
High sensitivity GPS receiver and reception
AssigneeseRide, Inc., Seiko Epson Corporation
InventorsPaul W. McBurney, Arthur N. Woo
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Abstract
A navigation receiver comprises a digital sampler that precedes digital signal processing which can operate at a high rate and a low rate. If the high rate is selected for noise reduction by non-coherent averaging, the samples are averaged over time and transformed to the low rate. The digital signal processor is fed only low-rate samples in either case.
Claims10
A method for improving the sensitivity of a navigation receiver, the method comprising the steps of:
- opening up the radio frequency (RF) and intermediate frequency (IF) passband of RF and IF receiver stages substantially wider than a desired-signal bandwidth;
- sampling a desired signal after superheterodyne conversion at a first sample-rate;
- averaging samples obtained in the step of sampling to zero-out noise and increase the signal-to-noise ratio of said desired signal;
- and
- outputting averaged samples obtained in the step of averaging at a second sample-rate substantially slower than said first sample-rate;
- wherein a digital signal processor provides for position solutions from said averaged samples obtained at said second sample-rate.
3 more elements
A navigation receiver, comprising,
- a first radio-frequency bandwidth filter having a passband at least twenty times the bandwidth of an expected signal, wherein sample averaging is improved;
- a high-rate sampler for taking high-rate samples of the signal and noise that pass through the first radio-frequency bandwidth filter;
- a summer for summing up high-rate samples and providing for sample averages;
- and
- a converter for converting said sample averages to a low-rate sample.
2 more elements
Dependencies are inferred from the claim text.