A325 GNSS Smart Antenna User Guide
3
PN 875-0318-000 Rev D2
Chapter 1: Introducing the A325 Smart Antenna
Key Features
Key features of the A325 include:
•
Centimeter-level accuracy using Eclipse technology in a rugged, all-in-one enclosure
•
Improved GNSS performance—particularly with RTK and GLONASS
applications—through the implementation of SureTrack technology
•
Long range RTK baselines of up to 50 km
•
Very fast RTK fix and reacquisition times
•
Supports CAN, NMEA 0183, NMEA 2000*, and binary for communication with
external devices
*requires NMEA certification
•
Bluetooth
®
capability for wireless data transfer
•
Wide operating voltage range of 7-36 VDC, providing high transient protection
for any power source
•
L-band* capable receiver (DGPS and high precision services)
*requires L-band subscription
•
Integrated 2D tilt sensor enables offset corrections
•
1 PPS timing output
A325 supports a variety of protocols for communicating with navigation systems, data loggers, CAN
systems, and other devices. See Appendix B, “Technical Specifications” for a list of communication
protocols supported by the A325 (Table B-4 on page 23) as well other technical specifications.
Multi-Function Application (MFA) Software
Your A325 may include MFA software that allows you to set the positioning (mode) hierarchy of your
device. To verify if your A325 contains MFA software send the $JAPP command to the A325; the
response indicates whether you have MFA as follows:
•
Without MFA (two specific applications listed)
Example: $>JAPP,WAASRTKB,AUTODIFF,1,2
•
With MFA (MFA and one specific application listed)
Example: $>JAPP,MFA,SBASRTKB,1,2
The hierarchy is the path your device follows to determine what differential source to use depending
on available sources. The hierarchy is as follows:
1.
RTK
2.
L-band (high precision, and high precision with GLONASS services)
3.
SBAS
4.
L-band (DGPS)
5.
Beacon
6.
External RTCM
7.
Autonomous
If you are running RTK and you lose your RTK radio link, the device defaults to the next highest
mode, being either L-band high precision service or high precision service with GLONASS (if
subscribed) or SBAS (if available). If the new signal
