IP Mobilenet IPM800 Mobile Radio User Manual GPS Application Note

IP Mobilenet, LLC Mobile Radio GPS Application Note

GPS Application Note

TrimbleKey Features and Benefits• 3.3V for batterypowered applications• Programmable powermanagement• Sized for portabledevicesLassen LP GPSLow power module for portable applicationsTrimble’s new Lassen™LP GPSis a low power miniature GPSreceiver module that is ideal forpower-conscious portable appli-cations. It is intended specificallyfor system designers and integra-tors who are developing the nextgeneration of portable devices.This embedded technology givesthe system developer the programming flexibility toachieve a significant reduction in power consumption. Power managementThe Lassen LP GPS features anew set of power managementtools that puts the power budgetdecision in the developer’s hands.The developer now can deter-mine the best balance betweenoperational frequency and powerconservation for a particularapplication.In Schedule Track™ operat-ing mode, the developer can program the unit to power up,quickly acquire satellites and out-put position to a schedule. Aftergathering satellite data and com-puting its location, the receivermay be directed to power downto a minimal mode of operationfor a programmed interval oruntil awakened by a hardwareinterruption. Schedule Trackprovides hot start performance at a programmed interval or inresponse to a hardware event.Schedule Track mode provides an advantage over normal battery-backed fast start modes with automatic wakeup to maintain current satellite data for fastest possible acquisition. Schedule Track offers the lowest power consumption in a deep sleepmode but provides position data as quickly as possible when needed.Ease of integrationLassen LP GPS provides a choiceof data protocols for maximumflexibility. The TSIP binary dataprotocol incorporates new powermanagement features and provides maximum control oversystem operation. The TAIP andNMEA protocols are availablewhere ASCII data is preferred. A secondary serial input port isavailable for RTCM SC-104 differential correction data forhigh accuracy applications. The Lassen LP GPS alsoincorporates Trimble’s antennadetection and protection circuitto monitor the condition of theantenna system. And a new highperformance, miniature 3.3 Vantenna is available for theLassen LP GPS.Getting startedThe Starter Kit makes it easy toevaluate the Lassen LP GPS andbegin development.Actual size
Lassen LP GPSLow power module for portable applicationsPHYSICAL CHARACTERISTICSDimensions 2.605″L×1.250″W×0.475″H(66.167mm ×31.750mm ×12 mm)Weight 0.4oz. (12.5 grams) Connectors RF: right angle MCXPower, I/O: 8-pin (2 ×4), 2 mm headerACCESSORIESGPS antenna Compact, 3.3V active micropatchantenna with 5-meter cable and magnetic mount.1.65″×1.99″×0.55″high(42mm ×50.5mm ×13.8 mm)ORDERING INFORMATIONModuleLassen LP GPS Module, Extended Temperature, TSIP (binary) protocol,NMEA 0183 (ASCII) protocol and TAIP (ASCII) protocol, DGPS readyAntennas3.3V antenna, 5-meter cable with MCX connectorStarter KitIncludes Lassen LP GPS module mounted on interface motherboard in adurable metal enclosure with dual DB9, RS232 interface, AC/DC powerconverter, magnetic-mount 3V antenna, TSIP, NMEA and TAIP protocols,software toolkit for TSIP, interface cable and manual.ManualLassen LP GPS Module System Designer Reference Guide© Copyright 1999, Trimble Navigation Limited. All rights reserved. The Trimble logo with Trimble is a trademark of Trimble Navigation Limited registered in the United States Patent and Trademark Office.Lassen and Schedule Track are trademarks of Trimble Navigation Limited. All other marks are the property of their respective owners. TID11547C (11/99)PERFORMANCE SPECIFICATIONSGeneral L1 frequency, C/A code (SPS), 8-channel,continuous tracking receiver, 32 correlatorsUpdate rate TSIP @ 1HzNMEA @ 1HzTAIP @ 1 HzAccuracyPosition 25m CEP (50%) w/o SAVelocity 0.1m/sec without SATime ±95 nano-seconds (over-determined clock mode)DGPS accuracyPosition 2m CEP (50%)Velocity 0.05m/secAcquisition (typical) Cold start*: <130 seconds (90%) Warm start**: <45 seconds (90%)Hot start***: <20 seconds (90%)Reacquisition after signal loss <2 seconds (90%)DynamicsAcceleration 4g (39.2 m/sec2)Motional Jerk 20m/sec3Operational limits Altitude <18,000m or velocity <515 m/seceither limit may be exceeded but not bothENVIRONMENTAL SPECIFICATIONSOperating temp –40°C to +85°C (standard)Storage temp –55°C to +100°CVibration 0.008g2/Hz 5Hz to 20 Hz0.05g2/Hz 20Hz to 100 Hz–3dB/octave 100Hz to 900 HzOperating humidity 5% to 95% R.H. non-condensing, +60°CAltitude –400m to +18,000mTECHNICAL SPECIFICATIONSPrime power +3.3V DC, ±0.3VPower consumptionNormal operation GPS board only: 55mA, 0.182Wwith antenna: 67mA, 0.221WDeep sleep 8mA, board onlyBackup power +3.0 to +3.6V DC2–5µA at +25°C (nominal)Serial ports/1PPS CMOS TTL levelsI/O Protocols TSIP (binary data)NMEA 0183 v2.1 (ASCII data)TAIP (ASCII data)NMEA messages GGA, VTG, GLL, ZDA, GSA, GSV and RMCmessages selectable by TSIP command;selection stored in non-volatile memory.Antenna power 3.3V at 12mA, feedline fault detect/protect* Cold start requires no initialization** Warm start implies last position, time and almanac are saved in battery-backed memory*** Hot start implies ephemeris also saved.All GPS receivers are subject to degradation of position and velocity accuracies underDepartment of Defense imposed Selective Availability (SA).Visit our website at www.trimble.com/oemSpecifications subject to change without notice.Trimble Navigation LimitedCorporate Headquarters645 North Mary AvenueSunnyvale, CA 94086+1-408-481-8940+1-408-481-7744 Faxwww.trimble.comTrimble Navigation Europe LimitedTrimble HouseMeridian Office ParkOsborne WayHook, Hampshire RG27 9HX U.K.+44 1256-760-150+44 1256-760-148 FaxTrimble NavigationSingapore PTE Limited79 Anson Road #05-02Singapore 079906SINGAPORE+65-325-5668+65-225-9989 Fax

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