Novatel OM-20000077 user manual Built-In Status Tests, Dead-Reckoning Mode

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Operation

Chapter 4

 

 

 

mode only. The receiver reports its current navigation sub-mode on its host port.

Your receiver must be a BASE model to act as a base station. A list of models is in Appendix A of the L1 GPS Firmware Reference Manual and in our Price List available from the Sales side menu of our website at www.novatel.com.

a. Differential (Roving Unit Only)

The receiver operates in Differential mode when data from at least 4 satellites with adequate geometry and differential corrections and/or measurements exist to compute position, velocity and time outputs. This is the preferred navigation mode. Differential data is supplied to the receiver through the differential input port. Differential data can be received only on the COM2 serial data port.

b. Stand-Alone Nav (Roving Unit Only)

The receiver operates in Stand-Alone Nav mode when it has data from at least 4 satellites with adequate geometry, but no differential corrections or measurements, exist to compute position, velocity and time outputs. This is the preferred navigation mode when insufficient differential data is available to generate a differential GPS fix.

c. Base Station Nav (Base Station Unit Only)

The receiver operates in Base Station Nav mode once the time has been initialized and at least 4 satellites with adequate geometry can be used for navigation purposes. Once in this mode, only a change of configuration (rover mode requested) or a reset will cause the unit to leave this navigation mode. In this mode, the unit will have the ability to transmit the DGPS messages which are requested and allowed once its position is initialized. See also Section 4.4, Configurable Parameters starting on Page 31 for position initialization details.

5.Dead-Reckoning Mode

The receiver enters Dead-Reckoning mode when it cannot remain in Navigation mode. The speed and direction is assumed to be constant to allow the receiver to provide an estimated position.

6.Fault Mode

The receiver enters Fault mode during the period of time in which the receiver outputs are affected by one or more critical system faults. This mode supersedes all others and remains active until the next power-down/power-up cycle. Fault mode is entered from any mode except Initialization.

4.6Built-In Status Tests

The receiver performs self-tests and generates status information to provide an indication of the operational readiness and to facilitate maintenance actions.

The built in test monitors system performance and status to ensure the receiver is operating within its specifications. If an exceptional condition is detected, you are informed through one or more indicators. The receiver status system is used to configure and monitor these indicators:

Message ID# 49, Receiver Status Data

Message ID# 51, Initiated BIT Result

Status LED on the FlexPak-SSII

Please refer to the L1 GPS Firmware Reference Manual for details on the Message IDs above. See also Section 4.5.2, Operational States starting on Page 31 and status LED information may be found in this manual on Page 50.

SUPERSTAR II User Manual Rev 3

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Contents Superstar Proprietary Notice Table of Contents Appendices Tables Figures Software License Software License Contact Information Firmware UpdatesElectrostatic Discharge CE Notice Warranty Policy Congratulations Scope Related PublicationsRelated Publications Superstar II GPS Card IntroductionIntroduction Chapter FlexPak-SSIIChapter Introduction Physical Characteristics Receiver SpecificationsSystem Architecture Radio Frequency RF SectionPrincipal Power Supply Enclosure and Wiring HarnessOptional LNA Power Supply GPS AntennaTypical System Configuration Reference Description InstallationElectrostatic Discharge Chapter InstallationEquipment Interconnection Serial ConnectionPower Connection Installation ConsiderationsInstallation Chapter Antenna Location1 J1 Interface and Power Connector Connectors and Connector Pins AssignmentData Link Base Station and Rover Units SeparationSerial Data Interface RF Connector J2Protocol Selection and Non Volatile Memory Preamplifier Power Pass-Through Antenna SupplyMemory Back-Up RF InputDiscretes IP2 and IP3 functions Use of DiscretesDefault Configuration Non Volatile MemoryNon-Volatile Memory Data Description Reference Installation OverviewOperation Typical Operational Configuration Reference DescriptionCommunications with the Receiver Serial Port Default SettingsGetting Started Operation ChapterBoot Information Power-Up InformationOperational Information Chapter OperationConfigurable Parameters Data RequestsReceiver States Self-Test Mode Built-In Status Tests Dead-Reckoning ModeDatum Support Message Formats RTCM-Format MessagesRTCM1 Differential GPS Corrections Fixed RTCM2 Delta Differential GPS Corrections Fixed RTCM9 Partial Satellite Set Differential CorrectionsChapter Message Formats Message Formats Chapter Nmea Format Data MessagesGPS System Errors Positioning Modes of OperationSingle-Point or Autonomous Positioning Modes of Operation Chapter Satellite-Based Augmentation System SbasSbas Receiver Sbas MessagesChapter Positioning Modes of Operation Positioning Modes of Operation Chapter Cable Lengths Vs. Gain TroubleshootingTroubleshooting Chapter Technical Specifications Appendix aSuperstar II Family Performance Output Messages Technical Specifications Appendix aMechanical Drawing Appendix a Technical SpecificationsJ1 Interfaces and Power Connector Pin Assignment Connector Pin AssignmentO Signals Voltage Limits 3 I/O Electrical CharacteristicsAppendix B FlexPak-SSII SpecificationsAppendix B FlexPak-SSII Specifications Status IndicatorsFlexPak Status Indicators Port Pin-OutsFlexPak-SSII Specifications Appendix B Automobile Power Adapter Cable NovAtel part numberCables FlexPak 13-Pin Serial Cable 3.2 13-Pin Deutsch to DB9 Serial Cable NovAtel part numberNormal Setup Setup and OperationDevelopment Kit DescriptionDifferential GPS Setup Dgps Setup with the FlexPak-SSIIStarView Software Installation Coaxial Cable Specifications Antenna SpecificationsAppendix C Cable SelectionGeodetic Active Antenna Antenna Specifications Appendix CAntenna Gain Depending on Cable Length Required Typical Current Consumption Versus Antenna GainActive Antenna Appendix C Antenna SpecificationsPassive Antenna Recommended Geodetic Active AntennasGPS Antenna 201-990146-716 MCX, +12 dB Passive Antenna Specifications Patch ElementGPS Antenna 201-990147-606 +26 dB Antenna Specifications Appendix C Standards/References Appendix DTtff and Satellite Acquisition Appendix ETime-To-First-Fix Ttff Re-AcquisitionAppendix F Utility InstallationUpdating Receiver Firmware System RequirementsStarting Software and Options Update Registration Key AcceptedUpdating Receiver Firmware Appendix F Appendix F Updating Receiver Firmware Programming SuccessGPS Overview Appendix GGPS System Design Space SegmentControl Segment Height RelationshipsUser Segment Appendix G GPS OverviewGPS Overview Appendix G GPS PositioningAccuracy versus Precision1 Single-Point vs. Relative PositioningMultipath Static vs. Kinematic PositioningReal-time vs. Post-mission Data Processing Consequences of Multipath Reception Why Does Multipath Occur?Antenna Site Selection Hardware Solutions For Multipath ReductionAntenna Designs GPS Signal Multipath vs. Increased Antenna HeightGPS Overview Appendix G Glossary of Terms Appendix HGlossary of Terms Appendix H Appendix H Glossary of Terms Glossary of Terms Appendix H Acronyms AppendixAcronyms Appendix Appendix Acronyms Index Index GEO, SbasIndex Index OM-20000077 Rev 2004/03/11