I've had Tetra System (NJTransit) working with voice, with a number of different base locations. I'm using 2 SDR's and Tetra Trunk Tracker. Id like to go further using DSDplus….LRRP to plot locations on a map. I think I set everything to where is supposed to be, however how do I verify that they are transmitting GPS location data. anyone here have any ideas how to take this further? I attached a few images of the system running.
Help with Tetra (NJ Transit) LRRP Location Data
- Thread starter rvrat1
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thewraith2008
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If the SDS LIP PDUs (the ones with the GPS in them) are been sent you will see them in the 'Network Info' 'Call' tab PDU output window.
You can check also by looking at the daily log for SDS PDUs (TETRA_sds_data_xxx.log)
You will know straight away if you are receiving them as you will see coordinates shown in each entry.
May look something like this:
You will see the location request PDUs sent on the downlink but it seems the location response PDUs are not always sent to the downlink.
They could be sent via uplink from MS to BS. The network may pass this via internet or some other closed network to the target radio which handles this data.
Another thing, in the first image, you have LRRP (Public) unchecked.
If LRRP is not from the DSD+ Fastlane version (your folder says 1.1), then this option should be checked.
The wrong setting here will format string for LRRP incorrectly and it won't work if you do see any location PDUs.
You can check also by looking at the daily log for SDS PDUs (TETRA_sds_data_xxx.log)
You will know straight away if you are receiving them as you will see coordinates shown in each entry.
May look something like this:
Code:
12:16:16 AM - SSI:1234567 D_SDS_Data Party_SSI:7654321 Type:UDT-4 Length:129 Protocol:Location_information SubType:Location_protocol_with_extension SubTypeExt:Long_location_report TimeDataType:2 LongShapeType:Location_circle LongVelocityType:No_velocity_information Reason_for_Sending:Maximum_reporting_interval_exceeded_since_the_last_location_information_report Lat:33.504724° Long:17.845154° HorizontalPostionAccuracy:Less_than_107mYou will see the location request PDUs sent on the downlink but it seems the location response PDUs are not always sent to the downlink.
They could be sent via uplink from MS to BS. The network may pass this via internet or some other closed network to the target radio which handles this data.
Another thing, in the first image, you have LRRP (Public) unchecked.
If LRRP is not from the DSD+ Fastlane version (your folder says 1.1), then this option should be checked.
The wrong setting here will format string for LRRP incorrectly and it won't work if you do see any location PDUs.
Thx for the reply T. Yes I am using Fastlane, however I neglected to upgrade the name of the folder, that is why the LRRP box is unchecked. I looked through the data files you mentioned and cannot see any evidence of location data. Decided to take a step backwards and setup a NEXEDGE system that for sure has LOCN data in the DSD Event window. I'm showing LRRP data in the DSDplusLRRP file however still cant get it to plot. Looks like I have to re-educate to the basic LRRP plotting. Attached is a few files I got from DSD LRRP cfg. Do these look ok?
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thewraith2008
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LRRP.cfg contents looks old. Mine has 9 lines in it.
Make sure you have updated LRRP to a Fastlane version (LRRP v1.21 is latest).
Using public release version of LRRP with not work with the Fastlane version of DSD+ or TTT when it's set to output to a Fastlane version.
Make sure you have updated LRRP to a Fastlane version (LRRP v1.21 is latest).
Using public release version of LRRP with not work with the Fastlane version of DSD+ or TTT when it's set to output to a Fastlane version.
OK....Re-updated my Fast lane files......Now have the Nexedge system plotting on LRRP map. So.....looks like back to Tetra system to see if I can sniff out any GPS location data. Thx for all the help T.
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