Leith Bade @leithbade

Engineer at Swift Navigation Canberra, Australia Joined September 2008

Tweets

352
Followers

82
Following

106
Likes

4

Leith Bade @leithbade

4 months ago

@NASA @NASAArtemis Do you have any special Easter treats like hot cross buns or chocolate eggs?

0 1 0 9 0

View Details

Leith Bade @leithbade

4 years ago

#horizonslive why has gravity not been explained by quantum physics?

0 0 0 0 0

View Details

Leith Bade @leithbade

5 years ago

@doug_ellison Hopefully they post the raw video files some stage.

0 0 0 0 0

View Details

@doug_ellison I was playing with the earlier rover down look frames and the best match with the official JPL video was 3 fps. It seems the images on the raw image page are only every 10th frame, so I wonder why the JPL video appears to be the full 30 fps since the extra frames are missing.

0 0 0 0 0

View Details

Leith Bade @leithbade

6 years ago

@GalileoSats We actually saw issues with the satellites clocks starting shortly after 00:00 UTC when looking back at the data after the outage.

0 0 0 0 0

View Details

Leith Bade @leithbade

6 years ago

@DCPowerCo Looks like NSW now allows larger residential solar installations - smh.com.au/environment/cl… Might be something worth sharing

0 0 0 0 0

View Details

Leith Bade @leithbade

7 years ago

@NSWRFS the link at top of the RFS website for "leave zone areas" is not working

0 0 0 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @JarkkotKoskinen @EU_GNSS Last satellite E33 to get data was updated an hour ago. All satellites are sending valid ephemeris now.

0 0 3 0 0

View Details

Leith Bade @leithbade

7 years ago

@NavSAS @EU_GNSS @fdovis @LinksFoundation @PoliTOnews @AlexMinetto @M_Vannucchi @marionicola75 @MicaelaTrogliaG @G_Povero The SISA value reflects the latest update from GSC that initial recovery steps have been taken but the system is not yet back to full operation.

0 0 1 0 0

View Details

Leith Bade @leithbade

7 years ago

@NavSAS @EU_GNSS @fdovis @LinksFoundation @PoliTOnews @AlexMinetto @M_Vannucchi @marionicola75 @MicaelaTrogliaG @G_Povero The broadcast Galileo ephemeris sets the Signal In Space Accuracy field to No Accuracy Prediction Available which the Galileo OS SDD says means the satellites are still unhealthy. It seems some receivers have not correctly implemented this detail

0 0 1 0 0

View Details

Leith Bade @leithbade

7 years ago

@GlbGnss @EU_GNSS @GalileoGNSS @GNSSasia @insideGNSS Its surprising it will navigate with the Galileo satellites. The ephemeris data is still setting the SISA field (Signal In Space Accuracy) field to to NAPA (No Accuracy Prediction Available) which Galileo ICD says means the signal is not healthy.

1 0 0 0 0

View Details

Leith Bade @leithbade

7 years ago

@GPSGIS_Eric For a start they need to set the health flags on their satellite as unhealthy as soon as an outage starts

0 0 2 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @GalileoGNSS @esa @EU_GNSS @GNSS_Status @JarkkotKoskinen @GPSBackup @LeoBodnar @LaunchStuff @planet4589 I also noticed satellite E33 has not had new data uploaded yet.

1 0 0 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @GalileoGNSS @esa @EU_GNSS @GNSS_Status @JarkkotKoskinen @GPSBackup @LeoBodnar @LaunchStuff @planet4589 Another popular brand of reference station receiver however does pick up the satellites are unhealthy.

1 0 3 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @GalileoGNSS @esa @EU_GNSS @GNSS_Status @JarkkotKoskinen @GPSBackup @LeoBodnar @LaunchStuff @planet4589 Upload rate is back to 10 minute intervals. the SISA value is set to No Accuracy Prediction Available which should stop receivers using the satellites. Health flags still not changed though?

2 0 1 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @GalileoGNSS @esa @EU_GNSS @GNSS_Status @JarkkotKoskinen @GPSBackup @LeoBodnar @LaunchStuff @planet4589 That looks like a receiver bug. However I noticed that brand of receiver (which I also have access to) was attempting to use Galileo the last few days too but rejected them after the RAIM check failed. They have not properly implemented the health checks!

0 0 1 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @JarkkotKoskinen @Tiedetuubi @EU_GNSS However unusual behaviour happens during batch 5 (Jul 10 10:30 to 18:38) and there are rumours that there was bad data in this batch. This time also coincides with when the first NAGU 2019025 was sent perhaps in response to reports of problems.

0 0 0 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @JarkkotKoskinen @Tiedetuubi @EU_GNSS Apparently each Galileo stores in memory 8 batches of data each of which is transmitted for 3 hours but valid for 4 hours. After Jul 10 13:24 it appears that two batches of data were broadcasted. Starting on Jul 11 02:47 all 8 batches are broadcast until the data runs out.

0 0 1 0 0

View Details

Leith Bade @leithbade

7 years ago

@coandrei @fgi_nls @Maanmittaus @GNSSfinland @JarkkotKoskinen @Tiedetuubi @EU_GNSS Yes that matches my analysis. The usual ground to satellite update frequency for Galileo is 10 minutes as seen until Jul 10 13:24, it then stop until 17:52, and continues to Jul 11 02:47, and there have been no uploads since.