GPS 02 » History » Revision 14
Revision 13 (laforge, 08/31/2022 06:25 PM) → Revision 14/15 (tnt, 01/22/2023 04:16 PM)
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h1. GPS 02 01 / GPS 03 01
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]]
The GPS 02 is also called _NCD 901 41/1_, while the GPS 03 is also called _NCD 901 56/1_
We're not aware of the exact differences between GPS 02 and GPS 03
{{thumbnail(gps02.jpg)}}
{{thumbnail(gps02_side.jpg)}}
h2. Connections
h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU
The unit has two RJ45 sockets. They appear to have identical functionality.
The pin-out is as follows:
|_.Pin|_.Name|_.Comment|
|1|1PPS+|RS-422 1PPS GPS -> DUx|
|2|1PPS-|RS-422 1PPS GPS -> DUx|
|3|RxD+|RS-422 in direction DUx -> GPS|
|4|TxD+|RS-422 NMEA in direction GPS -> DUx|
|5|TxD-|RS-422 NMEA in direction GPS -> DUx|
|6|RxD-|RS-422 in direction DUx -> GPS|
|7|12V|supply voltage from DUx -> GPS|
|8|GND|supply voltage from DUx -> GPS|
The supply voltage pins on a [[DUL 20]]/[[DUG 20]] only provide 3V-4V 3.1V until the GPS receiver is detected by means of a 1kOhms 1kOums resistor between 12V and GND. At that point, the DUL sources the full 12V.
But it will want to see at least a 10 mA load to continue providing the 12V !
The 1PPS output signal of the GPS 02 only becomes active once there is a GPS fix.
h3. SMA for connection to GPS antenna
This includes a 5V DC phantom voltage supply for the active antenna.
h2. LED
There is a single green LED.
* after power up, it takes some dozens of seconds until it first becomes active
* slow green blinking light indicates powered up but no GPS fix
* steady green light indicates powered up and GPS fix (1PPS output active)
h2. NMEA
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
h3. GPS 02
<pre>
$PERC,GPppr,246398,01024,00050,00,3,0*4E
$PERC,GPsts,0,0,0,1111*7B
...
$PERC,GPppr,246409,02113,00050,00,3,0*47
$PERC,GPsts,1,0,0,1111*7A
...
$GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64
$GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01
$PERC,GPppr,246435,02113,00050,06,0,0*4D
$GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C
$GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79
...
$PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54
...
$GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64
$GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01
$PERC,GPppr,246435,02113,00050,06,0,0*4D
$GPGSV,2,1,08,09,86,062,51,06,47,234,47,04,46,072,47,07,41,179,43*7C
$GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79
...
$PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54
</pre>
h3. GPS 03
looks mostly the same, just with a longer sequence of '1' in @$PERC,GPsts@ and with Glonass satellites in addition to GPS?
<pre>
$PERC,GPppr,000465,02048,00050,00,3,0*42
$PERC,GPsts,0,0,0,111111*7B
...
$PERC,GPver,GPS 03 01,NCD 901 56/1,R1B,TU8KBU9552.1544*11
$PERC,GPreh,00:00:00 00/00/0000,Other*24
$PERC,GPppr,000485,02048,00050,00,3,0*4C
$PERC,GPsts,0,0,0,111111*7B
...
$GPGGA,182300.00,5225.38450,N,01327.16970,E,1,16,0.65,37.6,M,44.7,M,,*61
$PERC,GPppr,325399,02225,00050,16,0,0*4F
$PERC,GPsts,1,0,0,111111*7A
$GNGSA,A,3,30,13,05,14,07,20,15,08,18,,,,0.95,0.65,0.70*15
$GPGSA,A,3,30,13,05,14,07,20,15,08,18,,,,0.95,0.65,0.70*0B
$GNGSA,A,3,75,76,82,72,65,66,74,,,,,,0.95,0.65,0.70*18
$GLGSA,A,3,75,76,82,72,65,66,74,,,,,,0.95,0.65,0.70*1A
$GPGSV,3,1,10,30,62,073,48,13,64,292,50,05,50,241,48,14,53,138,48*77
$GPGSV,3,2,10,07,29,070,45,20,27,200,45,15,31,297,39,08,15,044,38*70
$GPGSV,3,3,10,18,13,309,28,27,04,010,24,,,,,,,,*75
$GLGSV,2,1,08,75,85,141,47,76,29,214,44,82,11,329,29,72,24,143,26*63
$GLGSV,2,2,08,65,76,164,41,66,40,317,45,74,32,042,43,83,13,012,00*60
</pre>
h2. Circuit board pictures
h3. GPS 03
{{thumbnail(gps03_internal_top.jpg)}}
{{thumbnail(gps03_internal_bot.jpg)}}
h2. Further reading
http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf
