Micom 3T Operations Instructions download pdf (Page 122)

MICOM-3F/3T/3R HF-SSB Owner’s Guide

104

Using the MICOM-3 GPS Receiver

Introduction

This section provides you with the information needed to use the GPS receiver option.

Note

MICOM-3 transceivers that support the internal GPS receiver option have a

connector for the GPS antenna on their rear cover. The GPS receiver itself is

installed only upon specific order.

GPS Receiver Functions

The GPS receiver is an integral part of the MICOM-3 transceiver and can be used whenever the GPS

antenna supplied together with the MICOM-3 transceiver is properly connected and installed.

The GPS receiver provides accurate time and navigation data. The navigation data includes the

geographical coordinates (position data) and the altitude. When the MICOM-3 transceiver is moving,

you can also see the speed and direction (heading).

The information collected by the GPS receiver can be displayed on the MICOM-3 display when using

the CH and FREQ modes. In the ALE mode, the position data can be reported by means of AMD

messages; it can also be automatically reported in response to position queries (also sent by AMD

messages).

Format of GPS Information

The format of the navigation data can be selected in accordance with your needs:

• LLA format: Latitude, longitude and altitude (LLA). The latitude and longitude are displayed in

degrees, with a precision of hundredths of arc minutes (1/100 min); the altitude is reported in

meters, relative to the mean sea level (MSL).

Velocity is reported as the change in the East, North, and Up coordinates, presented in meter/sec

with a precision of 0.001 meter/sec.

• ECEF format: Earth-Centered, Earth-Fixed format for position and velocity. Provides your

position and velocity in a Cartesian (X, Y, Z) coordinate frame with its center at the Earth's center,

the Z-axis through the North Pole, and the X-axis through 0 degrees longitude, 0 degrees

latitude. The position is reported in meters.

Velocity for each axis (that is, is the change in the X, Y and Z coordinate) is displayed in

meter/sec, with a precision up to 0.001 meter/sec.

The time is always presented on basis of the UTC (Universal Time Coordinated).

How to Get the Best Results from your MICOM-3 GPS Receiver

The GPS receiver extracts the information it needs by analyzing the signals received from GPS

satellites. These satellite periodically transmit navigation messages, where the transmission of each

complete message requires almost 15 minutes. To calculate all the data your GPS receiver is capable

of providing, it must receive and decode navigation messages from at least 4 GPS satellites (the GPS

receiver can use as many as 8 satellites to improve accuracy).

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Micom 3T Operations Instructions Page 122