Product specifications

16
C HAPTER 3: C RESCENT V ECTOR
M ODULE
U NDERSTANDING THE C RESCENT V ECTOR OEM
The purpose of the Crescent Vector OEM board is to provide accurate, reliable
heading and position information at high update rates. To accomplish this task, the
Crescent Vector OEM uses a high performance GPS engine for GPS signal processing.
The one receiver processes information from both the primary GPS antenna and
secondary GPS antenna. Positions computed by the Crescent Vector are referenced
to the phase center of the primary GPS antenna. Heading data references the vector
formed from the primary GPS antenna phase center to the secondary GPS antenna
phase center.
C RESCENT S PECIFICATIONS
Although also presented in Appendix A, the following table lists the various
specifications of the Crescent Vector module.
Table 3-1. Crescent Vector Specifications.
Item Specification
Frequency 1.575 GHz
Channels Two 12 channel parallel (two 10 channel
when tracking SBAS)
Horizontal accuracy < 0.5 m 95%
Heading accuracy
(0.5m antenna separation)
0.5º 95%
Max position update Rate Up to 20 Hz (upgradeable option)
Max heading update rate Up to 20 Hz
Serial Interface Specifications (standard cable)
Item Specification
Serial port interface level 3.3 V CMOS
Port A, B, C and D connector Via 34-pin header
Port A / B /C available baud rates 4800, 9600, 19200, 38400 and
57600 Baud
Port D baud rate (for SBX module) 9600 (permanent setting)
Output protocols NMEA 0183, proprietary binary
Input protocol NMEA 0183
External correction input protocol RTCM SC-104
Correction output protocol RTCM SC-104
Raw SBAS data Available in Bin 80 message
Power Specifications
Item Specification
Input voltage
3.3 VDC ±3% (3.2 – 3.4 VDC)
Power consumption 1.7 W
Mechanical Characteristics
Item Specification
Length 109 mm (4.3”)
Width 71 mm (2.8”)