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Related Manuals for OXTS GPS-Base series
Summary of Contents for OXTS GPS-Base series
- Page 1 GPS-Base GNSS-aided inertial navigation system User Manual Confidently. Accurately.
- Page 2 Environmental protection Waste electrical products should not be disposed of with household waste. Please recycle where facilities exist. Check with your Local Authority or OxTS representative for recycling advice. Oxford Technical Solutions...
- Page 3 OxTS or its distributors are not responsible in any way for any claims or penalties arising from the operation of its equipment with radio in ways contradictory to local regulations and/or requirements and/or laws.
- Page 4 Warranty Oxford Technical Solutions Limited warrants its products to be free of defects in materials and workmanship, subject to the conditions set forth below, for a period of one year from the Date of Sale. 'Date of Sale' shall mean the date of the Oxford Technical Solutions Limited invoice issued on delivery of the product.
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Page 5: Table Of Contents
GPS-Base Manual Table of contents Common abbreviations ......................7 Introduction ..........................8 How do base stations work?....................8 Transmitting the corrections.....................10 Correction types........................11 Transmission frequency....................11 File logging........................12 Scope of delivery........................13 Conformance notices .......................15 Regulatory testing standards ....................15 Operation..........................16 Process of setting up the GPS-Base: ................16 General precautions ......................16 Selecting a suitable antenna location, and setting up the tripod........16 Setting up the tripod and antenna..................17... - Page 6 SATEL radio status ......................31 Freewave radio status ...................... 31 Differential correction message format .................. 33 Message output and frequency:..................33 Repeatability..........................35 Specifications...........................37 Index ............................38 Oxford Technical Solutions...
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Page 7: Common Abbreviations
MTSAT Satellite Augmentation System MSAS National Marine Electronics Association NMEA Networked Transport of RTCM via Internet Protocol NTRIP Pulse(s) Per Second Raw Data (an OxTS file format) RINEX Receiver INdependent EXchange format Real-Time Kinematics SBAS Satellite Based Augmentation System SDCM... -
Page 8: Introduction
Introduction Thank you for choosing Oxford Technical Solutions. The GPS-Base is a highly-portable GPS base station that transmits differential corrections to one or more differential enabled GNSS receivers via radio modem. The position accuracy of differential and RTK GNSS receivers is improved when using the GPS-Base. The GPS-Base is available with several different radio options. - Page 9 GPS-Base Manual Alternatively, if the base station is not placed at an accurately surveyed location, the only way for it to estimate the errors is to measure its own position as accurately as possible. It does this by averaging the GNSS measurements over a period of time before settling on one location. It then compares all further measurements to that chosen location in order to identify the errors in the same way as before.
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Page 10: Transmitting The Corrections
Please note that the use of the frequency bands 403–473 MHz is not harmonised across Europe. Please contact OxTS if you require further details on the specific frequency band and power settings for the radios supplied with your GPS-Base, and in which countries they can be used. -
Page 11: Correction Types
GPS-Base Manual Correction types The GPS-Base can transmit differential corrections in one of three different formats as shown in Table 3. The output type should match one supported by the mobile receiver. Table 3. Differential correction formats supported by the GPS-Base Format Purpose RTCA... -
Page 12: File Logging
Table 6. RTCMv3 message output Limited update Standard update Message rate rate RTCM1004 (extended L1/L2 GNSS pseudo-range and 1 Hz 0.25 Hz carrier-phase) RTCM1012 (extended L1/L2 GLONASS pseudo-range 1 Hz 0.25 Hz and carrier-phase) RTCM1005 (base station antenna position) 0.2 Hz 0.14 Hz RTCM1007 (extended antenna descriptor and set-up 0.1 Hz... -
Page 13: Scope Of Delivery
GPS-Base Manual Scope of delivery With the exception of a computer running Microsoft Windows, everything you need to utilise your GPS-Base should be included with the delivery. Please check carefully that everything shown on the delivery note is present. The following tables list the standard and any optional components delivered with your product. - Page 14 Table 7. Summary GPS-Base components common to all versions (Continued) Qty. Description Transit case Vexxis GNSS-802 antenna Professional tripod GPS-Base user manual GPS-Base Quick Installation Guide Table 8. Additional components supplied with SATEL 380–420 MHz radios Qty. Description SATEL SATELLINE-EASy (with display) radio modem, 380–420 MHz 3 m Satel 420 magnetic antenna with TNC connector Table 9.
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Page 15: Conformance Notices
GPS-Base Manual Conformance notices Any use or misuse of the GPS-Base, in a manner not intended by OxTS, may impair the protection provided. The GPS-Base complies with the radiated and conducted emission limits for CISPR 25 Level 2 and Class B of Part 15 of the FCC rules, and with the radiated emission and immunity limits for Class B of EN 61326. -
Page 16: Operation
Operation The GPS-Base has been designed to be as easy to operate as possible. However, it is important to have a sound understanding of how the system works, so please read the manual thoroughly before operating the product. The set-up procedure is summarised below. More detailed information on each step is also presented in the following sections. -
Page 17: Setting Up The Tripod And Antenna
GPS-Base Manual structures. It is also very important that the antenna does not move during the test. Ensure the supplied tripod is stable enough not to move in the wind and that no one can bump into it. When performing vehicle tests, consider gusts of wind that may be created by passing vehicles. -
Page 18: Connecting The Gnss Antenna And Radio Modem Cables
3. Ensure the tripod and antenna are located in a safe position and there is no chance they can move or fall over. Connecting the GNSS antenna and radio modem cables Before powering up the GPS-Base, the GNSS antenna should be connected to the GNSS connector using the supplied GNSS cable. -
Page 19: Powering Up And Monitoring The Gps-Base
GPS-Base to average its position over a three-minute period (once it computes a GNSS position) and to broadcast corrections in RTCMv3 format. The base station ID will be set to OxTS. Creating custom configurations using our NAVbase software is covered in the next section. -
Page 20: Hardware Led Descriptions
Hardware LED descriptions Power LED Description LED Label LED State Description Green solid Operational mode Yellow solid In process of booting Error, for example, invalid receiver AUTH code Red solid Firmware/Web UI update in progress GNSS LED Description LED Label LED State Description Green solid... - Page 21 GPS-Base Manual GPS-Base Manual USB TRANSFER LED Description LED State Description Green solid Stick plugged in, no activity Green slow blink Logging to stick with lots of available memory Green fast blink Transferring files to stick with lots of available memory Green/Yellow alternating blink Logging to stick but low available memory Yellow solid...
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Page 22: Communicating With The Product
Communicating with the product Our NAVbase software, which is supplied with the GPS-Base, is used to configure the product and monitor its operation. Using NAVbase you can: • Average base-station location • Enter base-station location, if known • Restore a saved base-station location •... -
Page 23: The Navbase Interface
GPS-Base Manual The NAVbase interface NAVbase can be started by clicking the Start button and typing navbase, or by clicking Start > All Programs > OxTS and selecting NAVbase. The initial launch screen is shown in Figure 5. Product Selection As NAVbase is our universal base station configuration tool, the first task is to tell the software which base station is about to configured. -
Page 24: Connection
Connection Figure 6. NAVbase Connection page The Connection page is used to specify which port NAVbase should use to communicate with the GPS-Base. If the GPS-Base was not connected when the software was run press the Scan Ports button to rescan the ports and find the GPS-Base. Remember port selection If the Remember port selection option is checked, then in future the software will skip the port scan. -
Page 25: Averaging Time
GPS-Base Manual restored from the GPS-Base, it can be entered by the user or the GPS-Base can average its position for a period of time to find an approximate location for the antenna. There is some discussion at the end of the manual describing the benefits of each technique. In general it is sufficient to average for three minutes. -
Page 26: Restore Position From File
Restore position from file If you have saved the location of the GPS antenna to a file then you can restore that file using this option. This guarantees repeatable data if you can locate the GPS antenna in exactly the same location each time. -
Page 27: Status
GPS-Base Manual By default the GPS-Base will transmit "OxTS" as the Base Station Identifier.What does the Use GPS settings button do? Limit output corrections message rate (ETSI EN 300 220-1): This option reduces the rate at which GPS-Base corrections are output to prevent overloading radio modems (such as the SATELLINE-EASy 896: firmware version 3.63.4 onwards) that comply to the 10% duty... -
Page 28: Communication
Table 11. Description of the status parameters Value Description Not Connected The GPS-Base software cannot find a GPS-Base to communicate with on the selected port. Return to the Connection page to select a different port or connect a GPS-Base to the computer Averaging The GPS-Base is averaging the GPS positions RTCA OK... -
Page 29: Logging Rtcmv3
If the software is configured to log RTCMv3 data to disk then the value will show the size of the file. Otherwise, if logging is not active, it will show "Off". Currently OxTS software does not support this format for post-processing but may use it in the future. -
Page 30: Start Logging
Start logging Use this option to start logging the raw GPS measurements from the GPS-Base. Once started the "Start Logging" button will become "Stop Logging" which will stop the logging of the raw GPS measurements when pressed. While logging it is not possible to change page or quit. Oxford Technical Solutions... -
Page 31: Led Status
GPS-Base Manual LED status Some of the radios provided with the GPS-Base have LEDs that show what the radio is doing. SATEL radio status This section only applies to the SATEL radio option. The GPS-Base will start outputting corrections when the antenna location has been found or entered. When transmitting corrections, the LEDs on the SATEL modem will be as shown in Table 12. - Page 32 mobile units since the Freewave radios use their bi-directional communication to form a more secure link. It can be difficult on the mobile unit to know if data is being received since only a transmit LED is available. If differential corrections are not being received by the INS/ GNSS product, then check that the differential correction format on the GPS-Base and on the INS/GNSS product are the same.
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Page 33: Differential Correction Message Format
GPS-Base Manual Differential correction message format There are a number of different standards for the differential corrections which will improve the position accuracy of moving GNSS receivers. The GPS-Base supports several differential correction formats. Please note: By default, the GPS-Base uses the RTCMv3 standard for transmitting its differential corrections. - Page 34 Table 16. RTCMv3 message output (Continued) Limited update Standard update Message rate rate RTCM1007 (extended antenna descriptor and set-up 0.1 Hz 0.1 Hz information). The base station firmware always configures the base station antenna as a Novatel GNSS 702 GGL RTCM1012 (extended L1/L2 GLONASS pseudo-range 1 Hz 0.25 Hz...
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Page 35: Repeatability
GPS-Base Manual Repeatability Differential corrections change the way a GNSS receiver works. When using differential corrections, the GNSS receiver is effectively measuring the position relative to the base station, not the absolute position on earth. This leads to several effects that the user should be aware of: 1. - Page 36 Figure 11. Averaging to a different position example The problem of averaging to a different position happens each time that the GPS-Base goes through its averaging process. There is nothing magical about the GPS-Base that allows it to get its own position accurate to 2 cm or better. It is subject to the same errors that all GNSS receivers have and can only average its position to about 1.8 m CEP.
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Page 37: Specifications
GPS-Base Manual Specifications The technical specification for the GPS-Base unit is shown below. Table 17. Technical specification (excluding radio modem) Parameter Specification Power 9–36 V dc, 2 W Operating temperature -40 °C to 75 °C Corrections RTCA (Differential, L1, L2), RTCA2, RTCMv3 1 Hz Frequency RS232... -
Page 38: Index
Index Index save/restore Specifications average averaging process tripod boot process Wi-Fi Carrier-phase configuration tool custom configurations Differential GNSS Harmonised license multi-path NAVbase Pseudo-range Radio modems Repeatability 10, 11, 31 RTCA RTCA2 11, 31 RTCAv2 10, 12, 31 RTCMv3 RTK (Real-Time Kinematic)
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