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Glossary

GPS RTK Base GPS Receiver User Guide

real-time

differential GPS

Also known as real-time differential correction or DGPS. Real-time differential

GPS is the process of correcting GPS data as you collect it. Corrections are

calculated at a base station and then sent to the receiver through a radio

link. As the rover receives the position it applies the corrections to give you a

very accurate position in the field.

Most real-time differential correction methods apply corrections to code

phase positions.

While DGPS is a generic term, its common interpretation is that it entails

the use of single-frequency code phase data sent from a GPS base station to

a rover GPS receiver to provide sub-meter position accuracy. The rover

receiver can be at a long range (greater than 100 kms (62 miles)) from the

base station.

rover A rover is any mobile GPS receiver that is used to collect or update data in

the field, typically at an unknown location.

Roving mode Roving mode applies to the use of a rover receiver to collect data, stakeout,

or control earthmoving machinery in real time using RTK techniques.

RTCM Radio Technical Commission for Maritime Services. A commission

established to define a differential data link for the real-time differential

correction of roving GPS receivers. There are three versions of RTCM

correction messages. All Trimble GPS receivers use Version 2 protocol for

single-frequency DGPS type corrections. Carrier phase corrections are

available on Version 2, or on the newer Version 3 RTCM protocol, which is

available on certain Trimble dual-frequency receivers. The Version 3 RTCM

protocol is more compact but is not as widely supported as Version 2.

RTK real-time kinematic. A real-time differential GPS method that uses carrier

phase measurements for greater accuracy.

SBAS Satellite-Based Augmentation System. SBAS is based on differential GPS, but

applies to wide area (WAAS/EGNOS and MSAS) networks of reference

stations. Corrections and additional information are broadcast via

geostationary satellites.

signal-to-noise

ratio

SNR. The signal strength of a satellite is a measure of the information

content of the signal, relative to the signal’s noise. The typical SNR of a

satellite at 30° elevation is between 47 and 50 dBHz.

skyplot The satellite skyplot confirms reception of a differentially corrected GPS

signal and displays the number of satellites tracked by the GPS receiver, as

well as their relative positions.

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RightWay GPS Navigator RW 430 Guia do Utilizador Página 90