Meinberg GPS167 Manuel utilisateur

GPS167

Technical Information

Operating Instructions

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]

April 25, 2006

Table of Contents

Impressum ............................................................................................ 2

General Information ............................................................................. 6

GPS167 Features .................................................................................. 7

Time Zone and Daylight Saving................................................. 8

Pulse and Frequency Outputs ..................................................... 8

Time Capture Inputs ................................................................... 9

Asynchronous Serial Ports (optional 4x COM).......................... 9

DCF77 Emulation ..................................................................... 10

Programmable pulse (optional) ................................................ 11

Timecode outputs (optional)..................................................... 11

Abstract ........................................................................... 11

Installation .......................................................................................... 12

Power Supply ............................................................................ 12

Mounting the Antenna .............................................................. 12

Antenna Short-Circuit .............................................................. 13

Assembly with CN-UB/E (optional) ........................................ 14

Powering Up the System .......................................................... 15

The Front Panel Layout ..................................................................... 16

FAIL LED ................................................................................ 16

LOCK LED .............................................................................. 16

LC Display ................................................................................ 16

MENU Key ............................................................................... 16

CLR/ACK Key ......................................................................... 16

NEXT Key ................................................................................ 17

INC Key .................................................................................... 17

The Menus in Detail ........................................................................... 17

Root Menu ................................................................................ 17

Menu RECEIVER POS. ........................................................... 19

Menu SV CONSTELLATION ................................................. 19

Menu SV POSITION ............................................................... 20

Menu USER CAPTURE .......................................................... 20

Menu SETUP............................................................................ 20

SETUP FREQUENCY OUTPUT................................... 21

SETUP ENABLE OUTPUTS ........................................ 21

SETUP TIME ZONE ...................................................... 22

SETUP DAYLIGHT SAV ON/OFF .............................. 22

SETUP SERIAL PORT PARM ...................................... 23

SETUP SERIAL STRING TYPE ................................... 24

SETUP SERIAL STRING MODE ................................. 24

SETUP POUT X (optional) ............................................ 25

Mode ...................................................................... 25

Timer mode ............................................................ 25

Single Pulse ........................................................... 26

Cyclic mode ........................................................... 26

PPS, PPM, PPH Modes ......................................... 26

Menu Quick Reference for progr. Pulse ................ 27

SETUP IRIG SETTINGS (optional) .............................. 28

SETUP INITIAL POSITION ......................................... 28

SETUP INITIAL TIME .................................................. 29

INIT USER PARMS ....................................................... 29

INIT GPS PARMS .......................................................... 29

FORCE BOOT MODE ................................................... 30

ANTENNA CABLE ....................................................... 30

Resetting Factory Defaults ................................................................. 31

Firmware Updates .............................................................................. 31

Skilled/Service-Personnel only: Replacing the Lithium Battery ....... 32

CE Label ............................................................................................ 32

Technical Specifications GPS167 ...................................................... 33

Oscillator specifications............................................................ 35

Technical Specifications GPS167 Antenna .............................. 36

Time Strings ............................................................................. 37

Format of the Meinberg Standard Time String ............... 37

Format of the Meinberg Capture String .......................... 38

Format of the SAT Time String ...................................... 39

Format of the Uni Erlangen String (NTP) ...................... 40

Format of the NMEA 0183 String (RMC) ...................... 42

Format of the ABB SPA Time String ............................. 43

Format of the Computime Time String........................... 44

Timecode (optional) ................................................................. 45

Principle of Operation ..................................................... 45

Block Diagram Timecode ............................................... 45

IRIG Standard Format ..................................................... 46

AFNOR Standard Format ............................................... 47

Assignment of CF Segment in IEEE1344 mode............. 48

Generated Timecodes ...................................................... 49

Selection of Generated Time Code ........................ 50

Outputs ............................................................................ 50

AM Sine Wave Output ........................................... 50

PWM DC Outputs .................................................. 50

Technical Data ................................................................ 51

Signal Description GPS167 V7.x ............................................. 52

Rear Connector Pin Assignments GPS167 V7.x ...................... 53

Menu Quick Reference ...................................................................... 55

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.

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.

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.

Time Capture Inputs

Two time capture inputs called User Capture 0 and 1 are provided at the rear connector

(CAP0 and CAP1) to measure asynchronous time events. A falling TTL slope at one

of these inputs lets the microprocessor save the current real time in its capture buffer.

From the buffer, capture events are transmitted via COM0 or COM1 and displayed on

LCD. The capture buffer can hold more than 500 events, so either a burst of events

with intervals down to less than 1.5 msec can be recorded or a continuous stream of

events at a lower rate depending on the transmission speed of COM0 or COM1 can be

measured. The format of the output string is ASCII, see the technical specifications at

the end of this document for details. If the capture buffer is full a message "** capture

buffer full" is transmitted, if the interval between two captures is too short the warning

"** capture overrun" is being sent.

Asynchronous Serial Ports (optional 4x COM)

Four asynchronous serial RS232 interfaces (COM0 ... COM3) are available to the

user. In the default mode of operation, the serial outputs are disabled until the receiver

has synchronized after power-up. However, the system can be configured to enable

those outputs immediately after power-up. Transmission speeds, framings and mode

of operation can be configured separately using the setup menu. COM0 is compatible

with other radio remote clocks made by Meinberg. It sends the time string either once

per second, once per minute or on request with ASCII ´?´ only. Also the interfaces can

be configured to transmit capture data either automatically when available or on

request. The format of the output strings is ASCII, see the technical specifications at

the end of this document for details. A separate document with programming instruc-

tions can be requested defining a binary data format which can be used to exchange

parameters with GPS167 via COM0.

DCF77 Emulation

The GPS167 satellite controlled clock generates TTL level time marks (active HIGH)

which are compatible with the time marks spread by the German long wave transmit-

ter DCF77. This long wave transmitter installed in Mainflingen near Frankfurt/

Germany transmits the reference time of the Federal Republic of Germany: time of

day, date of month and day of week in BCD coded second pulses. Once every minute

the complete time information is transmitted. However, GPS167 generates time marks

representing its local time as configured by the user, including announcement of

changes in daylight saving and announcement of leap seconds. The coding sheme is

given below:

M Start of Minute (0.1 s)

R RFTransmission via secondary antenna

A1 Announcement of a change in daylight saving

Z1, Z2 Time zone identification

Z1, Z2 = 0, 1: Daylight saving disabled

Z1, Z2 = 1, 0: Daylight saving enabled

A2 Announcement of a leap second

S Start oftime code information

P1, P2, P3 Even parity bits

Minute

(reserved)

Hour

Day of Month

Day of Week

Year of the Century

Month of Year

Time marks start at the beginning of new second. If a binary "0" is to be transmitted,

the length of the corresponding time mark is 100 msec, if a binary "1" is transmitted,

the time mark has a length of 200 msec. The information on the current date and time

as well as some parity and status bits can be decoded from the time marks of the 15th

up to the 58th second every minute. The absence of any time mark at the 59th second

of a minute signals that a new minute will begin with the next time mark. The DCF

emulation output is enabled immediately after power-up.

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