GPS Advancements and Applications

Dual Frequency Receivers
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Terms in this set (10)
Dual Frequency Receivers
-largest source of error is refraction due to atmosphere
-operate on both L1 and L2 carrier frequencies
-not available to civilian users
GPS modernization program
-Added civilian code to L2 -- L2C
-new L5 frequency
-new civilian code to L1 -- L1C
differencing / relative positioning
-two receivers used to simultaneously observe satellite signals
-technique of simultaneous baseline measurements
single difference
-difference in carrier phase measurements from one satellite as measured by 2 receivers = between-receivers difference
-eliminates satellite clock error and nearly all orbital errors and atmospheric errors
double difference
-between-satellites difference = difference in measurements from 2 satellites as measured by one receiver
-uses both between-receivers and between-satellite difference
-eliminates above errors and receiver clock error
Static survey
-several stationary receivers simultaneously collecting data from at least 4 satellites
-base receiver located on existing control station and remaining occupy statins with unknown coordinates
-rapid static
kinematic survey
-one or more of receivers are in motion during data collecting
-to begin, base receiver and rover occupy two known points to resolve ambiguities
-rover receiver must keep lock on satellite signals
-post-processed and-real time
control surveys
-establish precise horizontal and vertical positions of reference monuments
topographic survey
-preliminary surveys to locate horizontal and vertical positions of natural and man-made features and characteristics of terrain
-real-time kinematic survey
layout surveys
-coordinates of lay out points are uploaded to receiver & transmitted to roving receiver
-real-time kinematic survey