Abstract
In 2020, Garmin released one of the first consumer devices with a dual-frequency GNSS chip and a quadrifilar helix antenna: GPSMAP 66sr. The device is intended to serve as a positioning and navigation device for outdoor recreation purposes with positioning accuracies on the few meter level. However, due to its highly accurate GNSS dual-frequency carrier-phase observations, the equipment can also be used for centimeter-accurate positioning. We performed extensive test measurements and analyzed the quality of its code and carrier-phase observations. We calibrated the Garmin GPSMAP 66sr antenna with respect to its phase-center offset and phase-center variations. We also performed dual-frequency GPS/Galileo precise point positioning (PPP) and precise relative positioning in baselines to virtual reference stations (VRS). We demonstrate and explain how centimeter-accurate positioning can be achieved with this novel kind of equipment.
Highlights
In recent years, an increasing number of consumer devices have been released that possess dual-frequency GNSS chips and make code and carrier-phase observations available
We present results from the absolute positioning technique precise point positioning (PPP) (Section 4.1) and from relative baseline from the absolute positioning technique PPP (Section 4.1) and from relative baseline positioning with respect to a virtual reference station (VRS) (Section 4.2)
Precise point positioning (PPP) is a GNSS positioning technique that uses the carrierphase observations as primary observables and is able to produce cm level coordinates if phase observations as primary observables and is able to produce cm level coordinates dual‐frequency observations are available and if precise satellite orbits and satellite clock ifcorrections dual-frequency observations are available and if precise satellite orbits and satellite are introduced into the data processing
Summary
An increasing number of consumer devices have been released that possess dual-frequency GNSS chips and make code and carrier-phase observations available. Observation and Data Processing fromWe field measurements under adverse conditions All these observations were performed in static mode, mostly at sites with precisely known. Station, we used a Septentrio PolaRx5 receiver connected to a choke ring antenna of type tive mode requires additional data, such as precise GNSS orbit and clock information or. For analysis steps that required a local GNSS reference station, we used a Septentrio PolaRx5 receiver connected to a choke ring antenna of type Javad RingAnt‐DM JVDM.
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