GPS 02 » History » Version 11
laforge, 08/31/2022 02:30 PM
add notes about GPS 03
1 | 6 | laforge | {{>toc}} |
---|---|---|---|
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]] |
||
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_ |
8 | |||
9 | We're not aware of the exact differences between GPS 02 and GPS 03 |
||
10 | 3 | laforge | |
11 | 8 | laforge | {{thumbnail(gps02.jpg)}} |
12 | {{thumbnail(gps02_side.jpg)}} |
||
13 | |||
14 | 3 | laforge | h2. Connections |
15 | |||
16 | h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU |
||
17 | |||
18 | The unit has two RJ45 sockets. They appear to have identical functionality. |
||
19 | |||
20 | The pin-out is as follows: |
||
21 | |||
22 | |_.Pin|_.Name|_.Comment| |
||
23 | 10 | tnt | |1|1PPS+|RS-422 1PPS GPS -> DUx| |
24 | |2|1PPS-|RS-422 1PPS GPS -> DUx| |
||
25 | |3|RxD+|RS-422 in direction DUx -> GPS| |
||
26 | 3 | laforge | |4|TxD+|RS-422 NMEA in direction GPS -> DUx| |
27 | |5|TxD-|RS-422 NMEA in direction GPS -> DUx| |
||
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| |
||
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. |
||
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 |
||
37 | |||
38 | This includes a 5V DC phantom voltage supply for the active antenna. |
||
39 | 4 | laforge | |
40 | h2. LED |
||
41 | |||
42 | There is a single green LED. |
||
43 | * after power up, it takes some dozens of seconds until it first becomes active |
||
44 | * slow green blinking light indicates powered up but no GPS fix |
||
45 | * steady green light indicates powered up and GPS fix (1PPS output active) |
||
46 | 5 | laforge | |
47 | h2. NMEA |
||
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 |
||
53 | $PERC,GPsts,0,0,0,1111*7B |
||
54 | 7 | laforge | ... |
55 | 5 | laforge | $PERC,GPppr,246409,02113,00050,00,3,0*47 |
56 | $PERC,GPsts,1,0,0,1111*7A |
||
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 |
||
60 | $PERC,GPppr,246435,02113,00050,06,0,0*4D |
||
61 | $GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C |
||
62 | $GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79 |
||
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 |
||
68 | $PERC,GPppr,246435,02113,00050,06,0,0*4D |
||
69 | $GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C |
||
70 | $GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79 |
||
71 | 7 | laforge | ... |
72 | 5 | laforge | $PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54 |
73 | </pre> |
||
74 | 6 | laforge | |
75 | h2. Further reading |
||
76 | |||
77 | http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf |