Meinberg GPS167TGP User manual
Technical Information
Operating Instructions
GPS167TGP
- AP336.505
Impressum
Meinberg Funkuhren GmbH & Co. KG
Auf der Landwehr 22
D-31812 Bad Pyrmont
Phone: +49 (0) 52 81 / 9309-0
Fax: +49 (0) 52 81 / 9309-30
Internet: http://www.meinberg.de
Email: [email protected]
May 05, 2006
Table of Contents
Impressum ............................................................................................ 2
General Information ............................................................................. 7
The Modular System GPS167TGP ...................................................... 8
GPS167 Features .................................................................................. 9
Time Zone and Daylight Saving............................................... 10
Pulse and Frequency Outputs ................................................... 10
Time Capture Inputs ................................................................. 11
Asynchronous Serial Ports (optional 4x COM)........................ 11
DCF77 Emulation ..................................................................... 12
Programmable pulse (optional) ................................................ 13
Timecode outputs (optional)..................................................... 13
Abstract ........................................................................... 13
Installation .......................................................................................... 14
Power Supply ............................................................................ 14
Mounting the Antenna .............................................................. 14
Antenna Short-Circuit .............................................................. 15
Assembly with CN-UB/E (optional) ........................................ 16
Powering Up the System .......................................................... 17
The Front Panel Layout ..................................................................... 18
FAIL LED ................................................................................ 18
LOCK LED .............................................................................. 18
LC Display ................................................................................ 18
MENU Key ............................................................................... 18
CLR/ACK Key ......................................................................... 18
NEXT Key ................................................................................ 19
INC Key .................................................................................... 19
The Menus in Detail ........................................................................... 19
Root Menu ................................................................................ 19
Menu RECEIVER POS. ........................................................... 21
Menu SV CONSTELLATION ................................................. 21
Menu SV POSITION ............................................................... 22
Menu USER CAPTURE .......................................................... 22
Menu SETUP............................................................................ 22
SETUP FREQUENCY OUTPUT................................... 23
SETUP ENABLE OUTPUTS ........................................ 23
SETUP TIME ZONE ...................................................... 24
SETUP DAYLIGHT SAV ON/OFF .............................. 24
SETUP SERIAL PORT PARM ...................................... 25
SETUP SERIAL STRING TYPE ................................... 26
SETUP SERIAL STRING MODE ................................. 26
SETUP POUT X (optional) ............................................ 27
Mode ...................................................................... 27
Timer mode ............................................................ 27
Single Pulse ........................................................... 28
Cyclic mode ........................................................... 28
PPS, PPM, PPH Modes ......................................... 28
Menu Quick Reference for progr. Pulse ................ 29
SETUP IRIG SETTINGS (optional) .............................. 30
SETUP INITIAL POSITION ......................................... 30
SETUP INITIAL TIME .................................................. 31
INIT USER PARMS ....................................................... 31
INIT GPS PARMS .......................................................... 31
FORCE BOOT MODE ................................................... 32
ANTENNA CABLE ....................................................... 32
Resetting Factory Defaults ................................................................. 33
Firmware Updates .............................................................................. 33
Skilled/Service-Personnel only: Replacing the Lithium Battery ....... 34
CE Label ............................................................................................ 34
Technical Specifications GPS167 ...................................................... 35
Oscillator specifications............................................................ 37
Technical Specifications GPS167 Antenna .............................. 38
Time Strings ............................................................................. 39
Format of the Meinberg Standard Time String ............... 39
Format of the Meinberg Capture String .......................... 40
Format of the SAT Time String ...................................... 41
Format of the Uni Erlangen String (NTP) ...................... 42
Format of the NMEA 0183 String (RMC) ...................... 44
Format of the ABB SPA Time String ............................. 45
Format of the Computime Time String........................... 46
Timecode (optional) ................................................................. 47
Principle of Operation ..................................................... 47
Block Diagram Timecode ............................................... 47
IRIG Standard Format ..................................................... 48
AFNOR Standard Format ............................................... 49
Assignment of CF Segment in IEEE1344 mode............. 50
Generated Timecodes ...................................................... 51
Selection of Generated Time Code ........................ 52
Outputs ............................................................................ 52
AM Sine Wave Output ........................................... 52
PWM DC Outputs .................................................. 52
Technical Data ................................................................ 53
Signal Description GPS167 V7.x ............................................. 54
Rear Connector Pin Assignments GPS167 V7.x ...................... 55
Menu Quick Reference GPS167 ........................................................ 56
6
Technical appendix ............................................................................ 57
Technical Specifications GPS167TGP .............................................. 58
Rear Panel Connectors.............................................................. 58
CE Label ................................................................................... 58
Rear panel view GPS167TGP .................................................. 59
SUB-D Connector Assignments ............................................... 60
Connector Assignment Error Relais (Time Sync) .................... 60
Technical Specifications Power Supply Unit PULS AP336.505 ...... 61
Front Panel and Rear Connector Pin Assignments................... 61
7
General Information
The satellite receiver clock GPS167 has been designed to provide extremly precise
time to its user. The clock has been developed for applications where conventional
radio controlled clocks can´t meet the growing requirements in precision. High
precision available 24 hours a day around the whole world is the main feature of the
new system which receives its information from the satellites of the Global Posi-
tioning System.
The Global Positioning System (GPS) is a satellite-based radio-positioning, naviga-
tion, and time-transfer system. It was installed by the United States Departement of
Defense and provides two levels of accuracy: The Standard Positioning Service (SPS)
and the Precise Positioning Service (PPS). While PPS is encrypted and only available
for authorized (military) users, SPS has been made available to the general public.
GPS is based on accurately measuring the propagation time of signals transmitted
from satellites to the user´s receiver. A nominal constellation of 21 satellites together
with several active spares in six orbital planes 20000 km over ground provides a
minimum of four satellites to be in view 24 hours a day at every point of the globe.
Four satellites need to be received simultaneously if both receiver position (x, y, z)
and receiver clock offset from GPS system time must be computed. All the satellites
are monitored by control stations which determine the exact orbit parameters as well
as the clock offset of the satellites´ on-board atomic clocks. These parameters are
uploaded to the satellites and become part of a navigation message which is retrans-
mitted by the satellites in order to pass that information to the user´s receiver.
The high precision orbit parameters of a satellite are called ephemeris parameters
whereas a reduced precision subset of the ephemeris parameters is called a satellite´s
almanac. While ephemeris parameters must be evaluated to compute the receiver´s
position and clock offset, almanac parameters are used to check which satellites are in
view from a given receiver position at a given time. Each satellite transmits its own set
of ephemeris parameters and almanac parameters of all existing satellites.
7
8
The Modular System GPS167TGP
GPS167TGP is a set of equipment composed of a satellite controlled clock GPS167
together with a power supply unit PULS AP336.505, both installed in a metal desktop
case and ready to operate. The interfaces provided by GPS167 are accessible via
connectors in the rear panel of the case. Details of the components are described
below.
NEXT INC
CLR
ACK
MENU
FAI L LOC K
GPS167 assembled in desktop case (front view)
9
GPS167 Features
The hardware of GPS167 is a 100mm x 160mm microprocessor board. The 105mm
wide front panel integrates a 4 x 16 character LC display, two LED indicators and 4
push buttons. The receiver is connected to the antenna/converter unit by a 50 ohm
coaxial cable (refer to "Mounting the Antenna"). Feeding the antenna/converter oc-
curs DC insulated via the antenna cable. Optional an antenna splitter for up to four
receivers connected to one antenna is available.
GPS167 is using the "Standard Positioning Service" SPS. The navigation message
coming in from the satellites is decoded by GPS167´s microprocessor in order to track
the GPS system time. Compensation of the RF signal´s propagation delay is done by
automatical determination of the receiver´s position on the globe. A correction value
computed from the satellites´ navigation messages increases the accuracy of the
board´s oven controlled master oscillator (OCXO) and automatically compensates the
OCXO´s aging. The last recent value is restored from the battery buffered memory at
power-up.
The GPS167 provides different optional outputs, i.e. three progammable pulse
outputs, modulated/unmodulated timecode output, and up to a total of four RS232
COM ports. Additionally, you can order the GPS167 with different OCXOs (e.g.
OCXO-LQ / MQ / HQ or an external Rubidium) to match the required accuracy.
The hard- and software configuration of the clock is dis-
played if the NEXT key is pressed two times from the root
menu.
10
Time Zone and Daylight Saving
GPS system time differs from the universal time scale UTC (Universal Time Coordi-
nated) by the number of leap seconds which have been inserted into the UTC time
scale after GPS has been initiated in 1980. The current number of leap seconds is part
of the navigation message supplied by the satellites, so GPS167´s internal real time is
based on UTC. Conversion to local time including handling of daylight saving year by
year can be done by the receiver´s microprocessor if the corresponding parameters are
set up by the user.
Pulse and Frequency Outputs
The pulse generator of GPS167 generates pulses once per second (P_SEC) and once
per minute (P_MIN). Additionally, master frequencies of 10 MHz, 1 MHz and 100
kHz are derived from the OCXO. All the pulses are available with TTL level at the
rear connector. The included synthesizer generates a frequency from 1/8 Hz up to 10
MHz synchronous to the internal timing frame. The phase of this output can be shifted
from -360° to +360° for frequencies less than 10 kHz. Both frequency and phase can
be setup from the front panel or using the serial port COM0. Synthesizer output is
available at the rear connector as sine-wave output (F_SYNTH_SIN), with TTL level
(F_SYNTH) and via an open drain output (F_SYNTH_OD). The open drain output
can be used to drive an optocoupler when a low frequency is generated.
In the default mode of operation, pulse outputs and the synthesizer output are
disabled until the receiver has synchronized after power-up. However, the system can
be configured to enable those outputs immediately after power-up. An additional TTL
output (TIME_SYN) reflects the state of synchronization. This output switches to
TTL HIGH level when synchronization has been achieved and returns to TTL LOW
level if not a single satellite can be received or the receiver is forced to another mode
of operation by the user.
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