Rikaline, Operational characteristics, 1 initialization – Rikaline GPS-24 User Manual

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GPS Receiver Board

GPS-24 / 24A Operating Manual

Rikaline

Specifications subject to change without prior notice

Rikaline

International Corp.

10F, 64, Kang-Din Road, Taipei 108, Taiwan

Tel: ++886 2 2370 4688 Fax: ++886 2 2370 4686 E-Mail:

[email protected]

Web: www.rikaline.com.tw

2. Operational characteristics

2.1 Initialization


As soon as the initial self-test is complete, the GPS-22 begins the process of satellite acquisition and
tracking automatically. Under normal circumstances, it takes approximately 120 seconds to achieve a
position fix, 42 seconds if ephemeris data is known. After a position fix has been calculated, information
about valid position, velocity and time is transmitted over the output channel.

The GPS-22 utilizes initial data, such as last stored position, date, time and satellite orbital data, to achieve
maximum acquisition performance. If significant inaccuracy exists in the initial data, or the orbital data is
obsolete, it may take more time to achieve a navigation solution. The FirstGPS™ architecture provides
superior performance. However, acquisition performance can be improved as the host system initializes the
GPS-22 in the following situation:

1. Moving further than 1,500 kilometers.
2. Failure of Data storage due to the inactive memory power back up.


2.2 Navigation


After the acquisition process is complete, the GPS-22 sends valid navigation information over output
channels. These data include:

1) Latitude/longitude/altitude
2) Velocity
3) Date/time
4) Error

estimates

5) Satellite and receiver status

The GPS-22 sets the default of auto-searching for real-time differential corrections in RTCM SC-104
standard format, with the message types 1, 2, or 9. It accomplishes the satellite data to generate a
differential (DGPS) solution. The host system, at its option, may also command the GPS-22 to output a
position whenever a differential solution is available.

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