User manual TRIMBLE GPS PATHFINDER PROXRT 2.00 REV A

[. . . ] USER GUIDE GPS Pathfinder® ProXRT receiver USER GUIDE GPS Pathfinder® ProXRT receiver Version 2. 00 Revision A July 2010 F Trimble Navigation Limited 10355 Westmoor Drive Suite #100 Westminster, CO 80021 USA www. trimble. com Legal Notices © 2010, Trimble Navigation Limited. Trimble, the Globe & Triangle logo, GPS Pathfinder, and Nomad are trademarks of Trimble Navigation Limited, registered in the United States Patent and Trademark Office and in other countries. GeoBeacon, GPScorrect, H-Star, TerraSync, Tornado, and VRS are trademarks of Trimble Navigation Limited. Microsoft, Windows, Windows Mobile, Windows NT, Windows Vista, and Internet Explorer are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. [. . . ] Note ­ To connect to an external real-time differential correction source, such as a VRS network or GeoBeacon receiver, or to configure the GNSS field software to use corrections from an external real-time differential correction source, see Connecting to an external differential correction source, page 37. Using OmniSTAR real-time corrections The GPS Pathfinder ProXRT receiver can use OmniSTAR differential correction messages to improve the accuracy and integrity of GNSS data. OmniSTAR differential correction messages provide valid corrections over a large area. GPS Pathfinder ProXRT Receiver User Guide 53 4 Configuring the GNSS receiver To receive and decode these messages, you must subscribe to an OmniSTAR differential correction service. Currently, the levels of service offered are: · · · · HP (High Performance) achieves better than 10 centimeters XP achieves better than 20 centimeters VBS (Virtual Base Station) achieves sub-meter positioning G2, an optional service to HP and XP, that provides GLONASS corrections. Note ­ To achieve these levels of accuracy, the receiver must be operating within the coverage footprint of the service. For phone numbers and information on obtaining a subscription, subscription rates, and service coverage maps, go to www. omnistar. com. Once you have a subscription, you must activate the service through an over-the-air signal. Activating the OmniSTAR differential service 1. 2. Connect the receiver to the field computer that is running the GNSS field software. Call OmniSTAR and give them: ­ ­ your location ( for example, Sunnyvale, California, USA) the model number and serial number of your GPS Pathfinder ProXRT receiver (look at the label on the bottom of the receiver) your payment option the subscription method. Request the over-the-air method. ­ ­ Note ­ The receiver must be in an open-air environment and in sight of the appropriate OmniSTAR satellite to be granted access to the OmniSTAR system. OmniSTAR gives you the OmniSTAR satellite and frequency information for your local area. The service technician advises you of the approximate time when the subscription will be transmitted. The first time a receiver is put into service or after a long period of storage, it may take up to 30 minutes for the receiver to accumulate all the required information from the OmniSTAR and GPS or GLONASS satellites. The technician can delay the transmission for a period so that you can put the receiver into service. 54 GPS Pathfinder ProXRT Receiver User Guide Configuring the GNSS receiver 4 3. In the GNSS field software, select Setup, open the Real-time section and then tap the Setup button . 6. If you are using a VBS service, select the datum used by the service in the VBS Correction Datum field. The Frequency and Data Rate fields are automatically updated. 7. 8. In the Choice 2 field, specify whether to use SBAS corrections, uncorrected positions, or to stop using GNSS positions if corrections are not available. 10. Note ­ If the activation process does not complete within 45 minutes, call OmniSTAR and report the problem. Once the service is activated, OmniSTAR corrections begin less then 10 seconds after you configure the receiver to receive them. However, each time you want to use real-time corrections from the OmniSTAR service in the field you must connect to the service (see page 55). Connecting to the OmniSTAR differential service To receive real-time corrections from an OmniSTAR differential service in the field, make sure that Integrated OmniSTAR is selected in the Choice 1 field of the Real-time Settings form of the GNSS field software (see steps 3 through 8 on page 55). Once the receiver is connected to the OmniSTAR differential service, the estimated accuracy of the current position gradually improves to the accuracy specified by the correction service. This process is referred to as convergence, and the time it takes to achieve this is referred to as initialization. The initialization times vary and can take up to 60 minutes, depending on the type of OmniSTAR service you are connecting to, whether the receiver is moving, and environmental conditions such as the satellite geometry, multipath and so on. [. . . ] As the rover receives the position it applies the corrections to give you a very accurate position in the field. rover RTCM A rover is any mobile GNSS receiver that is used to collect or update data in the field, typically at an unknown location. A commission established to define a differential data link for the real-time differential correction of roving GNSS receivers. All Trimble GNSS receivers use Version 2 protocol for single-frequency real-time differential corrections. [. . . ]