Garmin GPS 35 LP Technical Specification

Also see for GPS 35 LP: Declaration of conformity Quick start guide Technical specification

Contents

Garmin GPS 35 LP Technical Specification Manual pdf 9 page image

5SECTION 2OPERATIONAL CHARACTERISTICSThis section describes the basic operational characteristics of the GPS 35LP. Additional informationregarding input and output specifications are contained in Section 4.2.1 SELF TESTAfter input power has been applied to the GPS 35LP and periodically thereafter, the unit will performcritical self test functions and report the results over the output channel(s). The following tests will beperformed:1) RAM check2) FLASH memory test3) Receiver test4) Real-time clock test5) Oscillator checkIn addition to the results of the above tests, the GPS 35LP will report software version information.2.2 INITIALIZATIONAfter the initial self test is complete, the GPS 35LP will begin the process of satellite acquisition andtracking. The acquisition process is fully automatic and, under normal circumstances, will takeapproximately 45 seconds to achieve a position fix (15 seconds if ephemeris data is known). After aposition fix has been calculated, valid position, velocity and time information will be transmitted over theoutput channel(s).Like all GPS receivers, the GPS 35LP utilizes initial data such as last stored position, date and time aswell as satellite orbital data to achieve maximum acquisition performance. If significant inaccuracy existsin the initial data, or if the orbital data is obsolete, it may take 5.0 minutes to achieve a navigationsolution. The GPS 35LP AutolocateTM feature is capable of automatically determining a navigationsolution without intervention from the host system. However, acquisition performance can be improved ifthe host system initializes the GPS 35LP following the occurrence of one or more of the following events:1) Transportation over distances further than 1500 kilometers2) Failure of the internal memory battery without system standby power3) Stored date/time off by more than 30 minutesSee Section 4 for more information on initializing the GPS 35LP.2.3 NAVIGATIONAfter the acquisition process is complete, the GPS 35LP will begin sending valid navigation informationover its output channels. These data include: