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- W1526498548 abstract "Conventional GPS receivers typically have limitedcapabilities for continuous tracking of satellite signals indeep urban canyons. In such environments we find thatreceivers obtain brief glimpses of satellites, but rarely seethree or more satellites simultaneously, resulting in poorfix availability. This would suggest that a GPS receiverthat can obtain useful pseudorange information from briefglimpses of satellites, or one which can obtain fixes fromas few as two satellites, may enhance fix availability inurban canyons.Here we present interim results of an ongoing effort toaddress these issues. More specifically, we presentseveral software and hardware modifications to GPSBuilderTM, a 12 channel GPS development system fromGEC Plessy Semiconductors. The hardware has beenmodified to use either a Cesium or ovenized quartzoscillator as an external frequency reference, therebyallowing a position solution from as few as two satellites.As the number of tracked satellites decreases from threeto two, the clock is assumed to drift at its last knownfrequency, a pseudolite is placed at the earths center, andthe fix is calculated. Results on effects of clock accuracyon initial acquisition times and the ability of a receiver tocoast through periods when a satellite is in the shadow ofa structure are presented.We also present results on obtaining fixes based on aslittle as one millisecond of data. The cross correlation of“Doppler shifted PRN templates” and one millisecond ofdigitized RF are calculated using Fast Fourier Transform(FFT) techniques. The peaks in absolute values of thesecross correlation functions are then further processed toobtain a Time of Arrival (TOA) resolution of 10 ns.These TOA’s (modulo 1 millisecond) have typical onesigma code phase noise of 30-50 ns.Finally, we present an interesting method whereby theseTOA’s can be processed to obtain a fix, even if time isonly known to several minutes (and hence satellitepositions are not known)." @default.
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- W1526498548 date "1995-09-15" @default.
- W1526498548 modified "2023-09-26" @default.
- W1526498548 title "GPS Receiver Structures for the Urban Canyon" @default.
- W1526498548 hasPublicationYear "1995" @default.
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