Patent ID: 7117094

Claim:
A seismic measurement system including: a plurality of digitizer units and associated geophones for collecting data relating to seismic activities; a base GPS receiver and an associated antenna with a substantial view of the sky, the base GPS receiver acquiring and tracking GPS satellite signals and producing range information; a plurality of slave GPS receivers, one at the location of each digitizer unit, with one or more of the slave GPS receivers operating in locations in which at various times the sianals from GPS satellites in certain sky locations are unavailable, weakened or corrupted by multipath at the one or more slave GPS receivers, the slave GPS receivers acquiring and tracking GPS satellite signals and producing range information; and a data recording and control center for collecting the range information from the base receiver and the slave receivers over an extended period of time and batch processing the information to calculate the positions of the respective slave GPS receivers and associated digitizer units, and collecting and analyzing the data provided by the respective digitizer units to produce seismic measurements.