RightWay GPS Navigator RW 430 Guia do Utilizador descarregar pdf (Página 88)

Glossary

GPS RTK Base GPS Receiver User Guide

epoch The measurement interval of a GPS receiver. The epoch varies according to

the measurement type: for real-time measurement it is set at one second; for

postprocessed measurement it can be set to a rate of between one second

and one minute. For example, if data is measured every 15 seconds, loading

data using 30-second epochs means loading every alternate measurement.

feature A feature is a physical object or event that has a location in the real world,

which you want to collect position and/or descriptive information

(attributes) about. Features can be classified as surface or non-surface

features, and again as points, lines/breaklines, or boundaries/areas.

firmware The program inside the receiver that controls receiver operations and

hardware.

GLONASS Global Orbiting Navigation Satellite System. GLONASS is a Soviet space-

based navigation system comparable to the American GPS system. The

operational system consists of 21 operational and 3 non-operational

satellites in 3 orbit planes.

GNSS Global Navigation Satellite System.

GSOF General Serial Output Format. A Trimble proprietary message format.

HDOP Horizontal Dilution of Precision. HDOP is a DOP value that indicates the

accuracy of horizontal measurements. Other DOP values include VDOP

(vertical DOP) and PDOP (Position DOP).

Using a maximum HDOP is ideal for situations where vertical precision is

not particularly important, and your position yield would be decreased by

the vertical component of the PDOP (for example, if you are collecting data

under canopy).

L1 The primary L-band carrier used by GPS and GLONASS satellites to

transmit satellite data.

L2 The secondary L-band carrier used by GPS and GLONASS satellites to

transmit satellite data.

L2C A modernized code that allows significantly better ability to track the L2

frequency.

L5 The third L-band carrier used by GPS satellites to transmit satellite data. L5

will provide a higher power level than the other carriers. As a result,

acquiring and tracking weak signals will be easier.

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RightWay GPS Navigator RW 430 Guia do Utilizador Página 88