Glossary

interface cable

The interface cable allows data to flow between the

 

Acutime 2000 and the communication equipment.

interference

Refers to the unwanted occurrences on communication

 

channels that are a result of natural or man-made noises and

 

signals, not properly a part of the signals being transmitted

 

or received.

integrated

A measurement of Doppler shift frequency or phase over

Doppler

time.

IODE

Issue Of Data, Ephemeris. Part of the navigation data. It is

 

the issue number of the ephemeris information. A new

 

ephemeris is available usually on the hour. Especially

 

important for Differential GPS operation that the IODE

 

change is tracked at both the reference station and mobile

 

stations.

jamming

Interference (in either transmitting or receiving signals)

 

caused by other radio signals at exactly or approximately the

 

same frequency.

masks

See satellite masks.

maximum PDOP

A measure of the maximum Position Dilution of Precision

 

(PDOP) that is acceptable in order for the GPS processor to

 

determine a location solution (see PDOP).

NAVSTAR

The name given to the GPS satellites, built by Rockwell

 

International, which is an acronym formed from NAVigation

 

System with Time And Ranging.

NMEA

National Marine Electronics Association. An association

 

that defines marine electronic interface standards for the

 

purpose of serving the public interest.

NMEA 0183

NMEA 0183 is a standard for interfacing marine electronics

message

navigational devices. The standard specifies the message

 

format used to communicate with marine devices/

 

components.

Glossary-8

Acutime 2000 Synchronization Kit User Guide

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Trimble Outdoors Part Number 45005-00-ENG, AcutimeTM2000 Synchronization Kit manual Iode