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GPS 02 » History » Version 15

WiFiLuke, 11/21/2023 04:22 PM
Add pictures of the internals of a GRU 04 01

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{{>toc}}
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h1. GPS 02 01 / GPS 03 01





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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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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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We're not aware of the exact differences between GPS 02 and GPS 03





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{{thumbnail(gps02.jpg)}}





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{{thumbnail(gps02_side.jpg)}}





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h2. Connections





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h3. RJ45 for connection to DUL/DUG/DUW/SIU/TCU





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The unit has two RJ45 sockets.  They appear to have identical functionality.





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The pin-out is as follows:





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|_.Pin|_.Name|_.Comment|





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|1|1PPS+|RS-422 1PPS GPS -> DUx|





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|2|1PPS-|RS-422 1PPS GPS -> DUx|





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|3|RxD+|RS-422 in direction DUx -> GPS|





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|4|TxD+|RS-422 NMEA in direction GPS -> DUx|





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|5|TxD-|RS-422 NMEA in direction GPS -> DUx|





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|6|RxD-|RS-422 in direction DUx -> GPS|





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|7|12V|supply voltage from DUx -> GPS|





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|8|GND|supply voltage from DUx -> GPS|





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The supply voltage pins on a [[DUL 20]]/[[DUG 20]] only provide 3V-4V until the GPS receiver is detected by means of a 1kOhms resistor between 12V and GND.  At that point, the DUL sources the full 12V.





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But it will want to see at least a 10 mA load to continue providing the 12V !





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The 1PPS output signal of the GPS 02 only becomes active once there is a GPS fix.





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h3. SMA for connection to GPS antenna





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This includes a 5V DC phantom voltage supply for the active antenna.





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h2. LED





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There is a single green LED.





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* after power up, it takes some dozens of seconds until it first becomes active





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* slow green blinking light indicates powered up but no GPS fix





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* steady green light indicates powered up and GPS fix (1PPS output active)





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h2. NMEA





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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





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h3. GPS 02





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<pre>





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$PERC,GPppr,246398,01024,00050,00,3,0*4E





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$PERC,GPsts,0,0,0,1111*7B





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...





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$PERC,GPppr,246409,02113,00050,00,3,0*47





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$PERC,GPsts,1,0,0,1111*7A





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...





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$GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64





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$GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01





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$PERC,GPppr,246435,02113,00050,06,0,0*4D





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$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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$GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79





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...





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$PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54





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...





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$GPGGA,202700.000,5225.382806,N,01327.169546,E,1,6,1.36,31.725,M,44.745,M,,*64





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$GPGSA,A,3,09,06,04,07,02,16,,,,,,,2.59,1.36,2.20*01





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$PERC,GPppr,246435,02113,00050,06,0,0*4D





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$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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$GPGSV,2,2,08,02,39,290,44,16,18,073,42,26,,,35,30,,,35*79





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...





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$PERC,GPver,GPS 02 01,NCD 901 41/1,R1D,110624*54





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</pre>





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h3. GPS 03





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looks mostly the same, just with a longer sequence of '1' in @$PERC,GPsts@ and with Glonass satellites in addition to GPS?





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<pre>





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$PERC,GPppr,000465,02048,00050,00,3,0*42





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$PERC,GPsts,0,0,0,111111*7B





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...





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$PERC,GPver,GPS 03 01,NCD 901 56/1,R1B,TU8KBU9552.1544*11





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$PERC,GPreh,00:00:00 00/00/0000,Other*24





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$PERC,GPppr,000485,02048,00050,00,3,0*4C





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$PERC,GPsts,0,0,0,111111*7B





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...





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$GPGGA,182300.00,5225.38450,N,01327.16970,E,1,16,0.65,37.6,M,44.7,M,,*61





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$PERC,GPppr,325399,02225,00050,16,0,0*4F





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$PERC,GPsts,1,0,0,111111*7A





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$GNGSA,A,3,30,13,05,14,07,20,15,08,18,,,,0.95,0.65,0.70*15





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$GPGSA,A,3,30,13,05,14,07,20,15,08,18,,,,0.95,0.65,0.70*0B





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$GNGSA,A,3,75,76,82,72,65,66,74,,,,,,0.95,0.65,0.70*18





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$GLGSA,A,3,75,76,82,72,65,66,74,,,,,,0.95,0.65,0.70*1A





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$GPGSV,3,1,10,30,62,073,48,13,64,292,50,05,50,241,48,14,53,138,48*77





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$GPGSV,3,2,10,07,29,070,45,20,27,200,45,15,31,297,39,08,15,044,38*70





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$GPGSV,3,3,10,18,13,309,28,27,04,010,24,,,,,,,,*75





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$GLGSV,2,1,08,75,85,141,47,76,29,214,44,82,11,329,29,72,24,143,26*63





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$GLGSV,2,2,08,65,76,164,41,66,40,317,45,74,32,042,43,83,13,012,00*60





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</pre>





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h2. Circuit board pictures





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h3. GPS 03





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{{thumbnail(gps03_internal_top.jpg)}}





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{{thumbnail(gps03_internal_bot.jpg)}}





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h3. GRU 04 01





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RF shielding around the ST GNSS Processor was removed.





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{{thumbnail(GRU0402_internal_top.jpg)}}





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{{thumbnail(GRU0402_internal_bottom.jpg)}}





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{{thumbnail(GRU0402_internal_top_detail1.jpg)}}





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{{thumbnail(GRU0402_internal_top_detail2.jpg)}}





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h2. Further reading





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http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf








        
        

    














  

  
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