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GNSSource-1000 Manual
sales@spectratime.com www.spectratime.com +41.32.732.16.66 Page 2 of 91
An Orolia Group Business
Table of Content :
1. INTRODUCTION ........................................................................................................................................................... 4
2. BEFORE GETTING STARTED .......................................................................................................................................... 4
2.1 UNPACKING ................................................................................................................................................... 4
2.2 SAFETY! ........................................................................................................................................................ 5
2.3 ENVIRONMENTAL RESPONSIBILITY.................................................................................................................. 5
2.4 INSTALLATION PROCEDURE............................................................................................................................ 5
2.4.1 Connections ......................................................................................................................................................... 5
2.4.2 Software Monitoring ........................................................................................................................................... 6
3. SYSTEM OPERATIONS .................................................................................................................................................. 8
3.1 OPERATING MODES ....................................................................................................................................... 8
3.2 OPERATING MODE SETUP .............................................................................................................................. 8
3.3 NORMAL POWER / ON SEQUENCE ................................................................................................................... 8
4. SYSTEM DESCRIPTION ................................................................................................................................................. 9
4.1 BLOCK DIAGRAM ........................................................................................................................................... 9
4.2 THE TIMING AND TRACKING SYSTEM OF THE GXCLOCK ................................................................. 10
4.2.1 THE “TRACK” MODE AND THE “SYNC” MODE. .................................................................................................. 11
4.2.2 THE FREQUENCY LEARNING .............................................................................................................................. 11
4.2.3 THE FREQUENCY IN USE .................................................................................................................................... 11
4.2.4 USER FREQUENCY CORRECTION ........................................................................................................................ 12
4.2.5 THE PPS TRACKING LOOP .................................................................................................................................. 12
4.2.6 TRACKING LIMITS AND ALARMS ........................................................................................................................ 12
4.2.7 FREQUENCY FLUCTUATIONS DURING THE TRACKING ....................................................................................... 12
4.2.8 FINE PHASE COMPARATOR OFFSET ................................................................................................................... 13
4.2.9 THE AUTOMATICAL RESTART OF THE TRACKING .............................................................................................. 13
1.1 SIMPLE SERIAL INTERFACE OPERATION ........................................................................................... 14
1.1.1 INTRODUCTION ................................................................................................................................................. 14
1.1.2 SERIAL INTERFACE CONNECTION ...................................................................................................................... 14
1.1.3 GXClock INTERNAL PARAMETERS MONITORING ............................................................................................... 14
1.1.4 CENTRE FREQUENCY ADJUSTMENT WITH THE SERIAL INTERFACE ................................................................... 15
1.1.5 CENTER FREQUENCY READ-BACK ...................................................................................................................... 15
1.2 STATUS & ALARMS ...................................................................................................................................... 15
2 TIMING & LOCKING CONTROL FUNCTIONS EXTENDED LIST ....................................................................................... 16
2.1 INFORMATION COMMANDS ................................................................................................................... 16
2.2 TRACKING COMMANDS ......................................................................................................................... 16
2.3 PPSOUT COMMANDS ............................................................................................................................. 16
2.4 DATE / TIME COMMANDS ....................................................................................................................... 16
2.5 SETTING COMMANDS............................................................................................................................. 16
2.6 OTHER COMMANDS ................................................................................................................................ 16
2.7 DEVICE STATUS ...................................................................................................................................... 44
2.7.1 STATUS BROADCASTED BY MESSAGES .............................................................................................................. 44
2.8 THE MAVXX.. SYSTEM .............................................................................................................................. 45
2.8.1 INTRODUCTION ................................................................................................................................................. 45
2.9 MAVXX.. PARAMETERS DESCRIPTION FOR THE GXCLOCK ................................................................ 46
2.9.1 Clock main parameters ...................................................................................................................................... 46
2.9.2 GPS main parameters ........................................................................................................................................ 46
2.10 SERIAL COMMUNICATION INTERFACE 2 ......................................................................................... 73
2.11 THE NMEA MESSAGES ............................................................................................................................ 74
2.11.1 Conditions : ........................................................................................................................................................ 74
2.11.2 Messages activation: ......................................................................................................................................... 74
2.11.3 Messages cancellation: ..................................................................................................................................... 74
2.11.4 The NMEA messages list: ................................................................................................................................... 74
2.11.5 Message NMEA $PTNTA .................................................................................................................................... 75
2.11.6 Message NMEA $PTNTS,B ................................................................................................................................. 75
2.11.7 Message NMEA $GPRMC .................................................................................................................................. 77
2.11.8 Message NMEA $GPZDA ................................................................................................................................... 78