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A
Appendix
A-13
Glossary
Almanac data
Information transmitted by each satellite concerning its the orbit.
Calculation mode
3D Operating mode: A three-dimensional GPS position fix using 4 or
more satellites. This mode gives the most precise position fix.
2D Operating mode: A two-dimensional GPS position fix using three
satellites.
2-satellite operating mode: Easy calculation method using two satellites.
This method does not guarantee precision.
Cold start
A unit starts to calculate a location when almanac data and ephemeris
data have not been collected from GPS satellites yet. It takes a longer
time to acquire satellite data, compared to warm start or a hot start.
DOP
Dilution of Precision (DOP)
Indicates the difference between the correct position and that calculated
using data received by a GPS receiver.
The dop indicators are GDOP (geometric DOP), PDOP (position DOP, 3
coordinates), HDOP (horizontal DOP, 2 coordinates), VDOP (vertical
DOP, height only) and TDOP (time DOP, clock offset only). Among
causes of dilution of the precision, there are problems caused in radio
transmission from satellites (fluctuation of radio waves due to weather
change and so on).
GDOP is calculated fixing aim to such a drift that satellites to be used for
calculating a location are placed against the location to be calculated
with less offset. The larger the value, the larger calculation error is. The
GPS receiver decides the best combination of satellites to be used based
on the GDOP value to obtain precision.
Содержание HKDW-704
Страница 15: ...1 9 第 1 章 GPSデータを使う 1 感度が不足する場合 6cmく らいの方形の鉄板をアンテナの下に敷く と感度があがり ます 車外に取り付けるには 周辺に障害物のない場所に水平方向に取りつけます ...
Страница 58: ...A 4 付録 A 世界の時差地図 TIME ZONE設定画面で 時差を設定する際の参考にしてく ださい ...
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Страница 144: ...Sony Corporation B P Company Printed in Japan 2004 03 13 2003 HKDW 704 SY 3 206 129 02 1 ...