Differential doppler velocity GPS receiver

Details Differential doppler velocity GPS receiver Differential doppler velocity GPS receiver

1989-03-27

1990-11-13

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342356, G01S 502, G01S 352

Patent

active

049705237

ABSTRACT:
To reduce error introduced by the local oscillator in the velocity calculations, the receiver has two "tracking channels" and a microcomputer. With numbers required to, simultaneously, lock each of the "tracking channels" each to a respective satellite signal, the microcomputer employs a differential doppler technique to calculate the receiver velocity. The microcomputer calculates a number which represents the difference between the apparent doppler frequency shift of the carrier signal which is transmitted by the first "tracking channel" satellite and which is measured over a specific time period and the apparent doppler frequency shift of the carrier signal which is transmitted by the second "tracking channel" satellite and which is measured over substantially the same time period.

REFERENCES:
patent: 4751512 (1988-06-01), Longaker
patent: 4797677 (1989-01-01), MacDoran et al.

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