Novatel SMARTV1G REAL-TIME Kinematic RTK Positioning, Using the can BUS, Post Processing

REAL-TIME KINEMATIC (RTK) POSITIONING

Corrections can be transmitted from a base station to a rover station to improve position accuracy. The base station is the GNSS receiver which is acting as the stationary reference. It has a known position and transmits correction messages to the rover station. The rover station is the GNSS receiver which does not know its exact position and can receive correction messages from a base station to calculate differential GNSS positions.

In most cases you need to provide a data link between the base station and rover station (two NovAtel receivers) in order to receive corrections. SBAS and L-Band corrections can be accomplished with one receiver and are exceptions to the base/ rover concept. Generally a link capable of data throughput at a rate of 9600 bits per second, and less than 4.0 s latency, is recommended.

Once your base and rover are set up, you can configure them for RTCM, RTCMV3 or CMR corrections. An RTCM example follows (replace the latitude, longitude and height coordinates shown in the FIX command line with those of your base):

Base

interfacemode com2 none rtcm off

fix position 51.11358042 -114.04358013 1059.4105

log com2 rtcm3 ontime 10 log com2 rtcm22 ontime 10 1 log com2 rtcm1819 ontime 1 log com2 rtcm1 ontime 5

Rover

interfacemode com2 rtcm none off

RT-20, with AdVance RTK, is a real-time kinematic software product developed by NovAtel. Optimal RTK performance is achieved when both the base and rovers are NovAtel products. However, AdVance RTK will operate with equipment from other manufacturers when using RTCM messaging.

RT-20 is supported by GPS-only and GPS+GLONASS models. Also, RT-20 with GPS+GLONASS provides faster convergence.

Refer to the GPGST log’s usage box in the OEMV Firmware Reference Manual for a definition of RMS and other statistics.

USING THE CAN BUS

A CAN Bus is a serial bus that provides services for processes, data and network management. There is a CAN Bus capable model of the SMART-V1 with its own multi-cable. CAN Bus functionality is controlled through NovAtel’s optional API software available through Customer Service. The API header file (*.h), in the API folder after installation, includes documentation on using the CAN Bus.

POST PROCESSING

Post-mission data processing refers to when the GPS data collected by the receiver is processed after the entire data- collection session is complete.

OEMV-based output is compatible with post-processing software from the Waypoint Products Group, NovAtel Inc. For details, visit our website at:

http://www.novatel.com/products/waypoint_pps.htm

QUESTIONS OR COMMENTS

If you have any questions or comments regarding your SMART-V1 or SMART-V1G please contact NovAtel using one of these methods:

Email: support@novatel.com

Web: www.novatel.com

Phone: 1-800-NOVATEL (U.S. & Canada) 403-295-4900 (International)

Quick Start Guide - SMART-V1/SMART-V1G Antenna

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GM-14915074 Rev 4 2009/09/22