ghost
commented
8 years ago Where can one find the signal strength for UAT traffic? What is the source of the “Signal_strength” field?
The SignalLevel field in the traffic table reports signal strength for 1090ES and UAT traffic in dB. If you're missing it, disable "Record Replay Logs, delete the stratux.sqlite file, and re-enable logs.
The raw (linear) signal level, normalized to 0 = no signal and 1 = max signal (I or Q axis saturated), is reported as part of the decoded dump1090 Stratux message, and logged to es_messages as you've noted.
The messages table contains the raw 978 UAT messages, along with message metadata. Signal_Amplitude is raw amplitude from dump978, scaled such that 0 = no signal and 1000 = max signal. Signal_Strength is the dB value, normalized to 0 dB = 1000 amplitude.
If the “ADSBTowerid” field is empty, is the “Signal_strength” direct UAT target data?
Yes.
If so, how can this be correlated with a specific target?
See the notes above about the SignalLevel field in traffic.
In the “traffic” table how is the 1090ES and 978UAT direct received traffic identified?
1090 and 978 traffic can be differentiated by the Last_Source field.
TRAFFIC_SOURCE_1090ES = 1
TRAFFIC_SOURCE_UAT = 2The type of target (air-to-air or ground-to-air) can be determined by the TargetType field, using the following type definitions from traffic.go:
TARGET_TYPE_MODE_S = 0
TARGET_TYPE_ADSB = 1
TARGET_TYPE_ADSR = 2
// Assign next type to UAT messages with address qualifier == 2
// (code corresponds to any UAT GBT targets with Mode S addresses.
// These will be displayed with the airplane icon on the traffic UI page.
// If we see a proper emitter category and NIC > 7, they'll be reassigned to TYPE_ADSR.
TARGET_TYPE_TISB_S = 3
TARGET_TYPE_TISB = 4Direct transmissions from aircraft will be either TargetType == 0 (Mode S messages, but no ADS-B position received yet for that ICAO code) or TargetType == 1 (ADS-B position has been received). Ground-based transmissions will be assigned codes 2-4. TargetType == 2 are ground-to-air ADS-R rebroadcasts of positions received on the other frequency. TargetType == 4 are TIS-B ground-air broadcasts of Mode C radar targets. TargetType == 3 are indeterminate -- they have Mode S addresses, and can either be TIS-B or ADS-R.
What unit of measure is the “distance” field? I assume it is meters, but I am not sure.
Correct. Meters, great circle distance, based on the last valid GPS position.
cyoung
Stratux config:
SDR [ ] single [ X ] dual
GPS [ X ] yes [ ] no type:
AHRS [ ] yes [ X ] no
power source: Ship
usb cable: Heavy Duty
EFB app and version: (e.g., WingX Pro7 8.6.2) NA
EFB platform: (e.g., iOS 9.2) NA
EFB hardware: (e.g., iPad Mini 2) NA
UAT Traffic Signal Strength: Where can one find the signal strength for UAT traffic? The 1090ES traffic signal strength is embedded in the Data Field of the es_messages table. I thought I might find it in the “traffic” table, but signal strength isn’t one of the fields.
“Traffic” table: In the “traffic” table how is the 1090ES and 978UAT direct received traffic identified?
What unit of measure is the “distance” field? I assume it is meters, but I am not sure.
“Messages” table: What is the source of the “Signal_strength” field? If the “ADSBTowerid” field is empty, is the “Signal_strength” direct UAT target data? If so, how can this be correlated with a specific target? ADS-B address?
I may have more questions as I delve into this further.
Thanks.
If possible, enable "Replay Logs", reproduce the problem, and provide a copy of the logs in http://192.168.10.1/logs/stratux/ and http://192.168.10.1/logs/stratux.log.