manualshive.com logo in svg

Meinberg GPS180PEX, Manual, Page: 25 / 48

Share
Download
Meinberg GPS180PEX Manual Download Page 25

10 Technical appendix GPS180PEX

10 Technical appendix GPS180PEX

10.1 Time codes

The transmission of coded timing signals began to take on widespread importance in the early 1950´s. Espe-
cially the US missile and space programs were the forces behind the development of these time codes, which
were used for the correlation of data. The definition of time code formats was completely arbitrary and left to
the individual ideas of each design engineer. Hundreds of different time codes were formed, some of which were
standardized by the „Inter Range Instrumentation Group“ (IRIG) in the early 60´s.

Except these „IRIG Time Codes“ other formats, like NASA36, XR3 or 2137, are still in use.

The board

GPS170PEX however generates the IRIG-B, AFNOR NFS 87- 500 code as well as IEEE1344 code which
is an IRIG-B123 coded extended by information for time zone, leap second and date. If desired other formats
are available.

10.1.1 The time code generator

The board GPS180PEX generates modulated and un-modulated timecodes. Modulated signals are transmitting
the information by varying the amplitude of a sine wave carrier, un-modulated timecodes are transmitted by pulse
duration modulation of a DC-signal (TTL in case of GPS180PEX), see chapter „IRIG standard format“ for details.

The sine wave carrier needed for modulated signals is generated in a digital way by a programmable logic
device on the board. The frequency of this signal is derived from the main oscillator of GPS180PEX, which is
disciplined by the satellite system.

This leads to a sine wave carrier with high accuracy. Transmission of date is synchronized by the PPS (pulse
per second) derived from the satellite system. The modulated time code has an amplitude of 3V

pp

(MARK) and

1V

pp

(SPACE) into 50

Ω

. The number of MARK-amplitudes within ten periods of the carrier defines the coding:

a) binary „0“ : 2 MARK-amplitudes, 8 SPACE-amplitudes
b) binary „1“ : 5 MARK-amplitudes, 5 SPACE-amplitudes
c) position-identifier : 8 MARK-amplitudes, 2 SPACE-amplitudes

The DC-signal has the following pulse durations accordingly:

a) binary „0“ : 2 msec
b) binary „1“ : 5 msec
c) position-identifier : 8 msec

GPS180PEX

Date: 28th March 2018

21

Summary of Contents for GPS180PEX

Page 1: ...MANUAL GPS180PEX Satellite controlled Radio Clock 28th March 2018 Meinberg Funkuhren GmbH Co KG ...

Page 2: ......

Page 3: ...Technical Specifications GPS Antenna 17 8 Firmware updates 18 9 Technical Specifications GPS180PEX 19 10 Technical appendix GPS180PEX 21 10 1 Time codes 21 10 1 1 The time code generator 21 10 1 2 IRIG Standard Format 22 10 1 3 AFNOR Standard Format 23 10 1 4 Assignment of CF Segment in IEEE1344 Code 24 10 1 5 Generated Time Codes 25 10 1 6 Selection of time code 26 10 2 Time Strings 27 10 2 1 For...

Page 4: ... 0183 String GGA 39 10 2 13 Format of the NMEA 0183 String ZDA 40 10 2 14 Format of the ION Time String 41 10 3 PCI Express PCIe 42 10 4 Content of the USB stick 43 11 Declaration of Conformity 44 Date 28th March 2018 GPS180PEX ...

Page 5: ...nberg Funkuhren GmbH Co KG Lange Wand 9 31812 Bad Pyrmont Germany Phone 49 0 52 81 93 09 0 Fax 49 0 52 81 93 09 230 Internet https www meinbergglobal com Mail info meinberg de Date 2015 11 23 GPS180PEX Date 28th March 2018 1 ...

Page 6: ...inal 5 Vorsicht Risiko eines elektrischen Schlages Caution possibility of electric shock 6 ISO 7000 0434 Vorsicht Risiko einer Gefahr Caution Danger 7 2012 19 EU Dieses Produkt fällt unter die B2B Kategorie Zur Entsorgung muss es an den Hersteller übergeben werden This product is handled as a B2B category product In order to secure a WEEE compliant waste disposal it has to be returned to the manuf...

Page 7: ...tion 2 3 Additional Safety Hints This manual contains important information for the installation and operation of this device as well as for your safety Make sure to read carefully before installing and commissioning the device Certain operating conditions may require the observance of additional safety regulations not covered by this manual Nonobservance of this manual will lead to a significant ...

Page 8: ...Replacing the Lithium Battery Skilled Service Personnel only Replacing the Lithium Battery The life time of the lithium battery on the receiver boards is at least 10 years If the need arises to replace the battery the following should be noted There is a Danger of explosion if the lithium battery is replaced incorrectly Only identical batteries or batteries recommended by the manufacturer must be ...

Page 9: ... 24 satellites together with some active spares in six orbital planes 20 000 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 determi...

Page 10: ... A converter FPGA programmable logic Time Code generator SRAM data memory antenna power internal power sample clock data clock clock clock control voltage data addr data addr data control dual Tx Rx optional lightning protector antenna converter unit power supply GPS signal IF LO frequency RG58 cable up to 300 meters without additional amplifier PCI Express bus power RS232 COM0 COM1 modulated time...

Page 11: ...iated in 1980 The current number of leap seconds is part of the navigation message supplied by the satellites so the satellite clock 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 For Germany the local time zone is UTC 3600 sec for standard time and UTC 7200 sec if daylight saving is in e...

Page 12: ...current real time in its capture buffer From the buffer an ASCII string per capture event can be transmitted via COM1 or displayed using the monitoring program 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 COM1 can be measu...

Page 13: ...ed pulses A cycle time of two seconds would generate a pulse at 0 00 00 0 00 02 0 00 04 etc DCF77 Simulation mode The corresponding output simulates the DCF77 time telegram The time marks are representing the local time as configured by the user Single Shot Mode A single pulse of programmable length is generated once a day at a programmable point of time Per Sec Per Min Per Hr modes Pulses each se...

Page 14: ...ication Z1 Z2 0 1 Daylightsavingdisabled Z1 Z2 1 0 Daylightsavingenabled A2 Announcementofaleapsecond S Startoftimecodeinformation P1 P2 P3 Evenparitybits 0 10 20 30 40 50 R M 1 4 2 1 20 10 8 4 2 1 P 2 0 2 0 1 8 4 2 1 2 4 8 10 1 2 4 8 1 0 2 0 4 0 8 0 3 P A1 Z1 Z2 A2 S 1 2 4 8 1 0 2 0 4 0 1 P Minute reserved Hour Day of Month Day of Week Year of the Century Month of Year Time marks start at the beg...

Page 15: ...d LED FAIL is turned on after power up until the receiver has synchronized or if a severe error occurs during operation The 9 pin sub D connector is wired to the GPS180PEX s serial port COM0 Pin assignment can be seen from the figure beside This port can not be used as serial port for the computer Instead it can be uses to send out Meinberg s standard time string to an external device A DIP switch...

Page 16: ...n this case Pin 1 DIP 1 or DIP 8 ON Pin 4 DIP 5 or DIP 10 ON Pin 7 DIP 3 or DIP 7 ON Pin 7 DIP 6 or DIP 9 ON The picture on the left shows all DIP switches on po sition OFF Please use the highlighted block on the right Those signals which do not have a lever of the DIP switch assigned are always available at the connector 9pin D SUB Signal Signal Level DIP Switch 1 VCC out 5 V 1 1 PPO_0 PPS out RS...

Page 17: ...The following list shows the pin assignmenmt of the SUB D connecter with ribbon cable in the Multiref position Some signals are only connected to the SUB D if the specified DIP switch is ON Multiref Port DIP 3 must be OFF DIP 9 must be OFF DIP 10 must be OFF DIP 5 must be OFF D SUB PIN Signal Signal Level DIP Switch 1 VCC out 5V 1 2 RxD1 in RS232 3 TxD1 out RS232 4 PPO_1 PPM TTL 5 4 10MHz out TTL ...

Page 18: ...onize and generate output pulses so synchronization can be achieved at least one minute after power up After 20 minutes of operation the TCXO has achieved its final accuracy and the generated frequencies are within the specified tolerances If the receiver position has changed by some hundred kilometers since last operation the satellites real elevation and Doppler might not match those values expe...

Page 19: ...uded A standard RG58 coaxial cable should be used to connect the antenna downconverter unit to the receiver The maximum length of cable between antenna and receiver depends on the attenuation factor of the coaxial cable Up to four GPS180 receivers can be run with one antenna downconverter unit by using an optional antenna splitter The total length of an antenna line from antenna to receiver must n...

Page 20: ...racket Normally you connect the antenna converter directly with the antenna cable to the system GPS Antenna free view to the sky Cable Slot N Norm female N Norm male N Norm male N Norm female N Norm female N Norm male Meinberg GPS N Norm male female or BNC male female as short as possible Ground lead to PE rail Protective Earth Cable ca 1 5 mm Ø fastened at the surge protector 16 Date 28th March 2...

Page 21: ...1575 42 MHz Bandwith 9 MHz Converter local oscillator to converter frequency 10 MHz first IF frequency 35 4 MHz Power Requirements 12V 18V 100mA provided via antenna cable Connector N Type female Ambient Temperature 40 65 C Housing ABS plastic case for outdoor installation IP66 Physical Dimension GPS180PEX Date 28th March 2018 17 ...

Page 22: ...OM A loader program shipped together with the file containing the image of the new firmware sends the new firmware from one of the computer s serial ports to the clock s serial port COM0 The contents of the program memory will not be modified until the loader program has sent the command to erase the flash memory The system will be ready to operate again after the computer has been turned off and ...

Page 23: ...d PPS pulse duration 200 msec valid on rising edge PPO_1 change of minute PPM pulse duration 200 msec valid on rising edge PPO_2 DCF77 simulation Synthesizer 1 8 Hz to 10 MHz base accuracy according to system accuracy 1 8 Hz to 10 kHz phase syncron with pulse per second 10 kHz to 10 MHz frequency deviation 0 0047 Hz ACCURACY OF PULSES better than 2 µsec during the first 20 minutes of operation bet...

Page 24: ...oise 1 Hz 60 dBc Hz 10 Hz 90 dBc Hz 100 Hz 120 dBc Hz 1 kHz 130 dBc Hz 1 Hz 60 dBc Hz 10 Hz 90 dBc Hz 100 Hz 120 dBc Hz 1 kHz 130 dBc Hz 1Hz 75dBc Hz 10Hz 110dBc Hz 100Hz 130dBc Hz 1kHz 140dBc Hz 1Hz 85dBc Hz 10Hz 115dBc Hz 100Hz 130dBc Hz 1kHz 140dBc Hz accuracy free run one day 1E 7 1 Hz Note 1 2E 8 0 2 Hz Note 1 1 5E 9 15mHz Note1 5E 10 5mHz Note1 accuracy free run one year 1E 6 10 Hz Note 1 4E...

Page 25: ...lated and un modulated timecodes Modulated signals are transmitting the information by varying the amplitude of a sine wave carrier un modulated timecodes are transmitted by pulse duration modulation of a DC signal TTL in case of GPS180PEX see chapter IRIG standard format for details The sine wave carrier needed for modulated signals is generated in a digital way by a programmable logic device on ...

Page 26: ...10 1 2 IRIG Standard Format 22 Date 28th March 2018 GPS180PEX ...

Page 27: ...10 Technical appendix GPS180PEX 10 1 3 AFNOR Standard Format GPS180PEX Date 28th March 2018 23 ...

Page 28: ...aylight saving time 64 Timezone Offset Sign sign of TZ offset 0 1 65 TZ Offset binary encoded 1 66 TZ Offset binary encoded 2 Offset from IRIG time to UTC time 67 TZ Offset binary encoded 4 Encoded IRIG time plus TZ Offset equals UTC at all times 68 TZ Offset binary encoded 8 69 Position Identifier P7 70 TZ Offset 0 5 hour set if additional half hour offset 71 TFOM Time figure of merit 72 TFOM Tim...

Page 29: ...pps AM sine wave signal 1 kHz carrier frequency BCD time of year Year g B007 100 pps DCLS Signal no carrier BCD time of year Year SBS time of day h B127 100 pps AM sine wave signal 1 kHz carrier frequency BCD time of year Year SBS time of day i AFNOR Code according to NFS 87500 100 pps wave signal 1kHz carrier frequency BCD time of year complete date SBS time of day Signal level according to NFS 8...

Page 30: ...on of timecode is done by the monitor software The unmodulated time code can be delivered as an active high default or activelow signal by setting a jumper on the board GPS180PEX into the appropriate position 26 Date 28th March 2018 GPS180PEX ...

Page 31: ...0 while leap second uv clock status characters depending on clock type u GPS clock is running free without exact synchr PZF time frame not synchronized DCF77 clock has not synchronized after reset space 20h GPS clock is synchronous base accuracy is reached PZF time frame is synchronized DCF77 clock has synchronized after reset v GPS receiver has not checked its position PZF DCF77 clock currently r...

Page 32: ...ar of the century 00 99 w the day of the week 1 7 1 Monday hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second xxxx time zone indicator UTC Universal Time Coordinated formerly GMT CET European Standard Time daylight saving disabled CEST European Summertime daylight saving enabled u clock status characters clock has not synchronized after reset space 2...

Page 33: ... hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second ss fractions of seconds 1 10 1 100 A Status A time data valid V time data not valid bbbb bb latitude of receiver position in degrees leading signs are replaced by a space character 20h n latitude the following characters are possible N north of equator S south d equator lllll ll longitude of receiver position in degrees lead...

Page 34: ...timezone related to UTC in hours and minutes ac clock status characters a clock has not synchronized after reset space 20h clock has synchronized after reset c GPS receiver has not checked its position space 20h GPS receiver has determined its position d time zone indicator S CEST European Summertime daylight saving enabled CET European Standard Time daylight saving disabled f anouncement of disco...

Page 35: ...eading signs are replaced by a space character 20h e longitude the following characters are possible E east of Greenwich W west of Greenwich hhhh altitude above WGS84 ellipsoid in meters leading signs are replaced by a space character 20h ETX End Of Text ASCII Code 03h GPS180PEX Date 28th March 2018 31 ...

Page 36: ...ers whereas the other characters are part of the time string The groups of characters as defined below T Start character sending with one bit accuracy at change of second yy mm dd the current date yy year of the century 00 99 mm month 01 12 dd day of month 01 31 ww the day of the week 01 07 01 monday hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second...

Page 37: ...s The format is SOH ddd hh mm ssq CR LF The letters printed in italics are replaced by ASCII numbers whereas the other characters are part of the time string The groups of characters as defined below SOH Start of Header ASCII control character sending with one bit accuracy at change of second ddd day of year 001 366 hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 w...

Page 38: ...other characters are part of the time string The groups of characters as defined below x 0 or 1 corresponding on the number of the capture input _ ASCII space 20h dd mm yy the capture date dd day of month 01 31 mm month 01 12 yy year of the century 00 99 hh mm ss fffffff the capture time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second fffffff fractions of second 7 digits C...

Page 39: ... whereas the other characters are part of the time string The groups of characters as defined below jj mm tt the current date jj year of the century 00 99 mm month 01 12 tt day of month 01 31 _ Space ASCII code 20h hh mm ss fff the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second fff milliseconds 000 999 cc Checksum EXCLUSIVE OR result of the previous character...

Page 40: ...racters are part of the time string The groups of characters as defined below X Control character code 58h sending with one bit accuracy at change of second G Control character code 47h U Control character code 55h yymmdd the current date yy year of the century 00 99 mm month 01 12 dd day of month 01 31 hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap sec...

Page 41: ...tart Of Text ASCII code 02h tt mm jj the current date tt day of month 01 31 mm month 01 12 jj year of the century 00 99 w the day of the week 1 7 1 monday hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second uv clock status characters u clock is running free without exact synchr space 20h clock is synchronous base accuracy is reached v receiver has not...

Page 42: ...conds 1 10 1 100 A Status A time data valid V time data not valid bbbb bbbbb latitude of receiver position in degrees leading signs are replaced by a space character 20h n latitude the following characters are possible N north of equator S south d equator lllll lllll longitude of receiver position in degrees leading signs are replaced by a space character 20h e longitude the following characters a...

Page 43: ... fractions of seconds 1 10 1 100 A Status A time data valid V time data not valid bbbb bbbbb latitude of receiver position in degrees leading signs are replaced by a space character 20h n latitude the following characters are possible N north of equator S south d equator lllll lllll longitude of receiver position in degrees leading signs are replaced by a space character 20h e longitude the follow...

Page 44: ...where as the other characters are part of the time string The groups of characters as defined below Start character ASCII Code 24h sending with one bit accuracy at change of second hhmmss ss the current UTC time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second HH II the local timezone offset to UTC HH hours 00 13 II minutes 00 59 dd mm yy the current date dd day of month 01...

Page 45: ...lics are replaced by ASCII numbers whereas the other characters are part of the time string The groups of characters as defined below SOH Start of Header ASCII control character sending with one bit accuracy at change of second ddd day of year 001 366 hh mm ss the current time hh hours 00 23 mm minutes 00 59 ss seconds 00 59 or 60 while leap second q Quality indicator space Time Sync GPS lock no T...

Page 46: ...ing and one wire pair for receiving data TX Logic D Component A Component B D VBIAS VBIAS D D RX Logic RX Logic TX Logic This design leads to a full duplex connection clocked with 2 5 GHz capable of transfering a data volume of 250 MB s per lane in each direction Higher bandwith is implemented by using multiple lanes silmutaneously A PCI Express x16 slot for example uses sixteen lanes providing a ...

Page 47: ...uter s system time synchronous to the received time If the delivered stick doesn t include a driver program for the operating system used it can be downloaded from http www meinbergglobal com english sw On the USB stick there is a file called readme txt which helps installing the driver correctly GPS180PEX Date 28th March 2018 43 ...

Page 48: ...ogy equipment EN55024 2010 Limits and methods of measurement of Immunity characteristics of information technology equipment EN 50581 2012 Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances gemäß den Richtlinien 2014 30 EU Elektromagnetische Verträglichkeit 2014 35 EU Niederspannungsrichtlinie 2011 65 EU Beschrän...

Reviews:

No comments