GPS 02 » History » Version 8
laforge, 07/22/2022 07:45 AM
| 1 | 6 | laforge | {{>toc}} |
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| 2 | |||
| 3 | 2 | laforge | h1. GPS 02 01 |
| 4 | 1 | laforge | |
| 5 | This is the Ericsson original GPS receiver that can be used to provide a clock reference to equipment like [[DUG 20]] or [[DUL 20]] or also the [[SIU 02]] |
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| 6 | 2 | laforge | |
| 7 | It is also called "NCD 901 41/1" |
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| 8 | 3 | laforge | |
| 9 | 8 | laforge | {{thumbnail(gps02.jpg)}} |
| 10 | |||
| 11 | {{thumbnail(gps02_side.jpg)}} |
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| 12 | |||
| 13 | 3 | laforge | h2. Connections |
| 14 | |||
| 15 | h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU |
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| 16 | |||
| 17 | The unit has two RJ45 sockets. They appear to have identical functionality. |
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| 18 | |||
| 19 | The pin-out is as follows: |
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| 20 | |||
| 21 | |_.Pin|_.Name|_.Comment| |
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| 22 | |1|1PPS-|RS-422 1PPS GPS -> DUx| |
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| 23 | |2|1PPS+|RS-422 1PPS GPS -> DUx| |
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| 24 | |3|RxD|RS-422 in direction DUx -> GPS| |
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| 25 | |4|TxD+|RS-422 NMEA in direction GPS -> DUx| |
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| 26 | |5|TxD-|RS-422 NMEA in direction GPS -> DUx| |
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| 27 | |6|RxD|RS-422 in direction DUx -> GPS| |
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| 28 | |7|12V|supply voltage from DUx -> GPS| |
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| 29 | |8|GND|supply voltage from DUx -> GPS| |
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| 30 | |||
| 31 | The supply voltage pins on a [[DUL 20]] only provide 3.1V until the GPS receiver is detected by means of a 1kOums resistor between 12V and GND. At that point, the DUL sources the full 12V. |
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| 32 | |||
| 33 | 4 | laforge | The 1PPS output signal of the GPS 02 only becomes active once there is a GPS fix. |
| 34 | 3 | laforge | |
| 35 | h3. SMA for connection to GPS antenna |
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| 36 | |||
| 37 | This includes a 5V DC phantom voltage supply for the active antenna. |
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| 38 | 4 | laforge | |
| 39 | h2. LED |
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| 40 | |||
| 41 | There is a single green LED. |
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| 42 | * after power up, it takes some dozens of seconds until it first becomes active |
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| 43 | * slow green blinking light indicates powered up but no GPS fix |
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| 44 | * steady green light indicates powered up and GPS fix (1PPS output active) |
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| 45 | 5 | laforge | |
| 46 | h2. NMEA |
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| 47 | |||
| 48 | 7 | laforge | Ericsson uses some extensions to the typical standard NMEA sentences. For more information, see "This scientific thesis about emulating an Ericsson GPS receiver twoards a RBS":http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf |
| 49 | |||
| 50 | 5 | laforge | <pre> |
| 51 | $PERC,GPppr,246398,01024,00050,00,3,0*4E |
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| 52 | $PERC,GPsts,0,0,0,1111*7B |
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| 53 | 7 | laforge | ... |
| 54 | 5 | laforge | $PERC,GPppr,246409,02113,00050,00,3,0*47 |
| 55 | $PERC,GPsts,1,0,0,1111*7A |
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| 56 | 7 | laforge | ... |
| 57 | 5 | laforge | $GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64 |
| 58 | $GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01 |
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| 59 | $PERC,GPppr,246435,02113,00050,06,0,0*4D |
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| 60 | $GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C |
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| 61 | $GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79 |
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| 62 | 7 | laforge | ... |
| 63 | 5 | laforge | $PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54 |
| 64 | 7 | laforge | ... |
| 65 | 5 | laforge | $GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64 |
| 66 | $GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01 |
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| 67 | $PERC,GPppr,246435,02113,00050,06,0,0*4D |
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| 68 | $GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C |
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| 69 | $GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79 |
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| 70 | 7 | laforge | ... |
| 71 | 5 | laforge | $PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54 |
| 72 | </pre> |
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| 73 | 6 | laforge | |
| 74 | h2. Further reading |
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| 75 | |||
| 76 | http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf |
