GPS 02 » History » Version 11
laforge, 08/31/2022 02:30 PM
add notes about GPS 03
| 1 | 6 | laforge | {{>toc}} |
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| 2 | |||
| 3 | 11 | laforge | h1. GPS 02 01 / GPS 03 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 | |||
| 7 | 11 | laforge | The GPS 02 is also called _NCD 901 41/1_, while the GPS 03 is also called _NCD 901 56/1_ |
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| 9 | We're not aware of the exact differences between GPS 02 and GPS 03 |
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| 10 | 3 | laforge | |
| 11 | 8 | laforge | {{thumbnail(gps02.jpg)}} |
| 12 | {{thumbnail(gps02_side.jpg)}} |
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| 13 | |||
| 14 | 3 | laforge | h2. Connections |
| 15 | |||
| 16 | h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU |
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| 17 | |||
| 18 | The unit has two RJ45 sockets. They appear to have identical functionality. |
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| 19 | |||
| 20 | The pin-out is as follows: |
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| 21 | |||
| 22 | |_.Pin|_.Name|_.Comment| |
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| 23 | 10 | tnt | |1|1PPS+|RS-422 1PPS GPS -> DUx| |
| 24 | |2|1PPS-|RS-422 1PPS GPS -> DUx| |
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| 25 | |3|RxD+|RS-422 in direction DUx -> GPS| |
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| 26 | 3 | laforge | |4|TxD+|RS-422 NMEA in direction GPS -> DUx| |
| 27 | |5|TxD-|RS-422 NMEA in direction GPS -> DUx| |
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| 28 | 10 | tnt | |6|RxD-|RS-422 in direction DUx -> GPS| |
| 29 | 3 | laforge | |7|12V|supply voltage from DUx -> GPS| |
| 30 | |8|GND|supply voltage from DUx -> GPS| |
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| 31 | |||
| 32 | 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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| 33 | |||
| 34 | 4 | laforge | The 1PPS output signal of the GPS 02 only becomes active once there is a GPS fix. |
| 35 | 3 | laforge | |
| 36 | h3. SMA for connection to GPS antenna |
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| 37 | |||
| 38 | This includes a 5V DC phantom voltage supply for the active antenna. |
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| 39 | 4 | laforge | |
| 40 | h2. LED |
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| 41 | |||
| 42 | There is a single green LED. |
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| 43 | * after power up, it takes some dozens of seconds until it first becomes active |
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| 44 | * slow green blinking light indicates powered up but no GPS fix |
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| 45 | * steady green light indicates powered up and GPS fix (1PPS output active) |
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| 46 | 5 | laforge | |
| 47 | h2. NMEA |
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| 48 | |||
| 49 | 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 |
| 50 | |||
| 51 | 5 | laforge | <pre> |
| 52 | $PERC,GPppr,246398,01024,00050,00,3,0*4E |
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| 53 | $PERC,GPsts,0,0,0,1111*7B |
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| 54 | 7 | laforge | ... |
| 55 | 5 | laforge | $PERC,GPppr,246409,02113,00050,00,3,0*47 |
| 56 | $PERC,GPsts,1,0,0,1111*7A |
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| 57 | 7 | laforge | ... |
| 58 | 5 | laforge | $GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64 |
| 59 | $GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01 |
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| 60 | $PERC,GPppr,246435,02113,00050,06,0,0*4D |
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| 61 | $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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| 62 | $GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79 |
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| 63 | 7 | laforge | ... |
| 64 | 5 | laforge | $PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54 |
| 65 | 7 | laforge | ... |
| 66 | 5 | laforge | $GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64 |
| 67 | $GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01 |
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| 68 | $PERC,GPppr,246435,02113,00050,06,0,0*4D |
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| 69 | $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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| 70 | $GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79 |
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| 71 | 7 | laforge | ... |
| 72 | 5 | laforge | $PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54 |
| 73 | </pre> |
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| 74 | 6 | laforge | |
| 75 | h2. Further reading |
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| 76 | |||
| 77 | http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf |
