leemoore1966 wrote:Cub wrote:...Of more concern to me is that the position of G-HAMR is just as depicted in your screenshot, just crossing the coast just south..;
Hi Cub
Perhaps you could share your data for us to compare ?
As the screenshot only shows rounding to 60 seconds (the minute display), it would be preferable to show the minutes before and after
Thx
Lee
@Cub
Hi Cub, can you please share your data reference ?In the meantime, exfirepro supplied his flight data recorder information
This contains records of both the ADS-B position reports and mlat position reports
The ADS-B update for G-HAMR was very sporadic, I have no idea why this is the case, but the MLAT reports were frequently updated.
I have reduced the report to comparing positions to the ADSB, (when provided) against the next MLAT record
**
edit** I was calculating the position error to the Receiver, not to each other, this is corrected
Summary, the average distance error is 0.28nm - That is pretty good I think, here is the full listing
in the flight recorder we use an extended syntax for the PFLAA records attempting to (pessimistically) predict the NACp(Navigational Accuracy Parameter) and HFOM(Horizontal Field of Merit)
Code: Select all$PFLAA,0,15011,-24469,642,1,405051!G-HAMR,37,-0.5,49,3.8,14*14
$PFLAA,0,14836,-24600,642,1,405051!G-HAMR,38,0.0,46,3.8,14,6,NACp,0.30,HFOM*26
Error = 219M 0.12NM
$PFLAA,0,17849,-23615,569,1,405051!G-HAMR,20,1.0,52,6.1,14*3E
$PFLAA,0,17475,-23693,571,1,405051!G-HAMR,19,0.0,47,0.0,14,6,NACp,0.30,HFOM*29
Error = 382M 0.21NM
$PFLAA,0,18835,-23158,460,1,405051!G-HAMR,44,-7.5,45,4.4,14*11
$PFLAA,0,18363,-23451,466,1,405051!G-HAMR,59,0.0,53,4.4,14,5,NACp,0.50,HFOM*29
Error = 556M 0.30NM
$PFLAA,0,23516,-21742,232,1,405051!G-HAMR,55,0.1,62,0.0,14*30
$PFLAA,0,22698,-22390,246,1,405051!G-HAMR,54,0.0,59,0.0,14,5,NACp,0.50,HFOM*29
Error = 1044M 0.56NM
$PFLAA,0,25138,-19340,7,1,405051!G-HAMR,65,0.5,88,0.0,14*34
$PFLAA,0,24841,-20074,8,1,405051!G-HAMR,64,0.0,83,0.0,14,4,NACp,1.00,HFOM*27
Error = 792M 0.43NM
$PFLAA,0,24398,-18388,-52,1,405051!G-HAMR,126,12.2,14,0.0,14*22
$PFLAA,0,24980,-17804,-52,1,405051!G-HAMR,65,0.0,86,0.0,14,5,NACp,0.50,HFOM*33
Error = 824M 0.44NM
$PFLAA,0,23666,-14796,-172,1,405051!G-HAMR,75,-2.0,54,0.0,14*38
$PFLAA,0,23630,-15022,-169,1,405051!G-HAMR,79,0.0,66,0.0,14,6,NACp,0.30,HFOM*01
Error = 229M 0.12NM
$PFLAA,0,24651,7601,-229,1,405051!G-HAMR,325,-3.0,70,0.0,14*17
$PFLAA,0,24473,7769,-231,1,405051!G-HAMR,331,25.9,69,0.0,14,6,NACp,0.30,HFOM*15
Error = 245M 0.13NM
$PFLAA,0,26487,5657,-169,1,405051!G-HAMR,293,-0.7,79,0.0,14*1B
$PFLAA,0,26175,6148,-170,1,405051!G-HAMR,297,-0.5,82,0.0,14,5,NACp,0.50,HFOM*0D
Error = 582M 0.31NM
$PFLAA,0,30385,2452,-21,1,405051!G-HAMR,306,-0.5,59,0.0,14*29
$PFLAA,0,29931,2901,-33,1,405051!G-HAMR,308,-0.3,60,0.0,14,6,NACp,0.30,HFOM*35
Error = 639M 0.35NM
$PFLAA,0,35970,-5275,257,1,405051!G-HAMR,232,-2.7,64,0.0,14*13
$PFLAA,0,36589,-4409,256,1,405051!G-HAMR,256,0.0,58,0.0,14,5,NACp,0.50,HFOM*2C
Error = 1064M 0.57NM
$PFLAA,0,34217,-12230,398,1,405051!G-HAMR,276,0.0,66,0.0,14*07
$PFLAA,0,34104,-11443,397,1,405051!G-HAMR,273,0.0,55,0.0,14,6,NACp,0.30,HFOM*16
Error = 795M 0.43NM
$PFLAA,0,34230,-12302,405,1,405051!G-HAMR,274,0.3,66,0.0,14*00
$PFLAA,0,34240,-12204,401,1,405051!G-HAMR,276,0.0,66,0.0,14,8,NACp,0.05,HFOM*16
Error = 99M 0.05NM
$PFLAA,0,35373,-14470,493,1,405051!G-HAMR,287,0.0,60,0.0,14*05
$PFLAA,0,35207,-14084,517,1,405051!G-HAMR,287,4.6,69,0.0,14,6,NACp,0.30,HFOM*15
Error = 420M 0.23NM
$PFLAA,0,39114,-19755,765,1,405051!G-HAMR,304,-1.0,59,0.0,14*25
$PFLAA,0,39051,-19634,763,1,405051!G-HAMR,306,0.5,60,0.0,14,7,NACp,0.10,HFOM*1C
Error = 136M 0.07NM
$PFLAA,0,39279,-20227,786,1,405051!G-HAMR,296,-2.5,54,3.8,14*20
$PFLAA,0,39261,-19813,744,1,405051!G-HAMR,301,-1.0,54,-3.8,14,7,NACp,0.10,HFOM*1C
Error = 414M 0.22NM
$PFLAA,0,39597,-22232,886,1,405051!G-HAMR,284,-4.0,52,4.4,14*23
$PFLAA,0,39519,-21765,886,1,405051!G-HAMR,292,0.0,59,4.4,14,5,NACp,0.50,HFOM*1A
Error = 473M 0.26NM
$PFLAA,0,39982,-23150,886,1,405051!G-HAMR,289,0.5,58,4.4,14*06
$PFLAA,0,39870,-22916,886,1,405051!G-HAMR,288,0.0,54,4.4,14,6,NACp,0.30,HFOM*12
Error = 259M 0.14NM
$PFLAA,0,40295,-24188,855,1,405051!G-HAMR,280,-3.0,47,0.0,14*25
$PFLAA,0,40233,-23727,855,1,405051!G-HAMR,286,0.0,58,0.0,14,5,NACp,0.50,HFOM*15
Error = 465M 0.25NM
$PFLAA,0,44275,-31544,701,1,405051!G-HAMR,308,0.5,59,-2.2,14*29
$PFLAA,0,43882,-31048,701,1,405051!G-HAMR,307,0.0,60,-2.2,14,5,NACp,0.50,HFOM*3B
Error = 633M 0.34NM
$PFLAA,0,47477,-35627,487,1,405051!G-HAMR,300,0.0,81,-6.1,14*2E
$PFLAA,0,47261,-34989,487,1,405051!G-HAMR,309,0.0,76,-6.1,14,6,NACp,0.30,HFOM*3F
Error = 674M 0.36NM
avg=0.28
Thx
Lee