CSI Wireless DGPS MAX User Manual

Vector Sensor Reference Manual 56
• The Type 2 message contains delta differential corrections that are used when the remote receiver is
using a different satellite navigation message than used by the base station.
• The Type 5 message contains GPS constellation health information used for improving tracking
performance of a GPS receiver
• The Type 6 message contains null information, and is broadcast so that a beacon receiver demodulating
the data from the broadcast does not lose lock when the beacon station has no new data to transmit.
Note - RTCM is a local area data standard. This means that when positioning with
correction input to the Vector Sensor from an external source or outputting
corrections from the Vector Sensor to another GPS receiver, performance will
degrade as a function of distance from the base station. The additional degradation
will depend on the difference in observed orbit and ionospheric errors between the
reference station and the remote unit. A general rule of thumb would be an
additional 1 m error per 100 miles. This error is often seen as a bias in positioning,
resulting in a position offset. The scatter or the receiver is likely to remain close to
constant.
The RTCM SC-104 data output by the Vector Sensor is converted from the RTCM SC-159 data
broadcast by SBAS.
Appendix D - Resources contains the contact information should you wish to purchase a copy of
the RTCM SC-104 specification.
4.3 Configuring the Vector Sensor
All aspects of Vector Sensor operation may be configured through either serial port with the use
of NMEA 0183 commands. These commands are described in the Chapter 6. The following
items are user-configurable.
• NMEA 0183 message interface
• Tilt aiding
• Tilt Sensor calibration
• Magnetic aiding
• Magnetometer calibration
• Gyro aiding
• Time constants
• Level operation
• Heading compensation
• Configuration for pitch or roll
• Antenna separation
• Elevation mask
• Differential timeout
• Baud rates
4.4 Configuring the Data Message Output
The Vector Sensor features two bi-directional ports referred to as A and B. GPS data messages
for both ports are easily configured by sending NMEA commands to the Vector Sensor receiver
through either of its communication ports (the output of Port B can be configured through A, for

CSI Wireless DGPS MAX Specifications

General

Brand	CSI Wireless
Model	DGPS MAX
Category	Receiver
Language	English