CSI Wireless DGPS MAX, Reference Manual

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DGPS MAX Reference Manual
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1.8 COAST™ Technology
The DGPS MAX receiver incorporates new technology referred to as
COAST™ that allows the DGPS MAX receiver to operate with old
correction data for up to 30 minutes without significant accuracy
degradation. The ability of the DGPS MAX to perform such as this is
attributed to sophisticated algorithms that are able to anticipate how errors
will change during a period of correction loss.
Traditional receiver technology would experience an increasing degradation
with increasing age of corrections. COAST™ technology provides
consistent positioning during periods where loss of signal occur, thus
bridging the gap to when signal reacquisition occurs. This means that the
DGPS MAX is more tolerant to data loss when a correction signal is
masked due to noise or line of sight issues than competing products.
1.9 CDA-2MAX Antenna Information
The antenna supplied with the DGPS MAX provides radio frequency
signals to all three internal receivers. Inside the CDA-2MAX’s enclosure
are an L-band antenna for reception of GPS, WAAS, and L-band satellite
signals, and an H-field beacon loop antenna for reception of beacon signals.
Both of these antenna elements are active and draw their power from the
DGPS MAX receiver. The CDA-2MAX outputs all three signals through
its TNC connector to the DGPS MAX’s TNC-S antenna input port labeled
‘ANT’. Internally, the DGPS MAX separates the three signals are and
routes them to the appropriate internal sensor.
The L-band antenna element is designed for reception of both GPS and L-
band satellite DGPS transmissions. The gain pattern of the antenna is
designed so that the system will function well at higher latitudes where the
OmniSTAR and WAAS satellites appear lower on the horizon. The L-band
antenna features a low noise amplifier, allowing the use of antenna cable
lengths up to 10 meters (RG-58U). If longer cable runs are required for
your application, please contact CSI Wireless for a low-loss antenna cable.