Horus 52 – SHSSP 2019 Flight Report

This year AREG was once again involved with the International Space University’s Southern Hemisphere Space Studies Program (SHSSP), hosted by the University of South Australia. As with previous years, AREG performed a high-altitude balloon launch, carrying a SHSSP-developed payload. AREG members also worked with the project participants, running tutorials on various aspects of the launch.

The planned launch date was the 2nd of February, but had to be delayed a week due to poor flight-path predictions. In the lead-up to the new launch date (9th of February) predictions were looking good, however as the date got closer the prediction moved further and further north with a predicted landing to the west of Morgan. To make things even more interesting, the chance of showers at the launch site increased from 10%, to 30%, then to 70% over the final 3 days before the launch, along with predictions of 30kph winds.

Still, launch planning continued, and on the morning of Saturday the 9th of February the Project Horus launch crew and the SHSSP participants assembled at the Mt Barker High School oval for one of our most challenging launches to date!

 

 

After finding a filling location mostly out of the wind, the launch crew were able to get the balloon filled quickly and get the payloads laid out ready for launch. SHSSP participants assembled and tested their payload, before sealing it up ready for the launch.

Just as the planned launch time of 11AM approached, the launch director was informed by Air Traffic Control that a 10 minute launch hold was required. This couldn’t have come at a worse time, as the wind started to immediately pick up. The balloon wranglers had a very challenging time stopping the balloon from blowing around in the wind, with the latex envelope coming dangerously close to bursting many times.

Finally the launch was given the all-clear from ATC, and the payloads were released during in a short lull in the wind, using the classic ‘running launch’ method. Unlike a previous launch in high winds, the payloads easily cleared the trees and were on their way to the stratosphere.

A big thanks to all the launch crew for helping out – it was great to see many members at the launch site, and it certainly made this challenging launch a lot easier!

The Chase!

The chase teams for this flight consisted of Mark’s team (Mark VK5QI, Andy VK5AKH and Will VK5AHV), and Liam VK5LJG flying solo. As the flight path was predicted to be a long one (landing near Morgan!), the teams set of immediately after launch, leaving pack-up to the rest of the ground crew (thanks guys!).

Meanwhile tracking stations across the state began collecting telemetry. Michael VK5ZEA in Port Lincoln had his station in full swing:

While the AREG ground station deployed and manned by Peter VK5KX collected as much of the telemetry as possible from the multiple transmitters on this flight.

As for the chase and recovery teams, they steadily drove north through Palmer and Sedan heading for an expected landing near Morgan. The teams were caught by surprise by the balloon’s early burst at 25km altitude (the expected burst was 35km), which shifted the resulting landing prediction very close to the River Murray north-west of Waikerie.

Mark’s team immediately diverted through Blanchetown and headed towards landing area, and were able to track the payloads down to 62m altitude from the highway. A route to the landing site (in a vineyard at Qualco) was determined, and the team continued on. Unfortunately Liam VK5LJG had a vehicle fault, and had to stop at the Blanchetown roadhouse to await repairs.

Horus 52 Flight Path

While Mark’s team was approaching Waikerie, Steve VK5ST also made an appearance – he had been waiting near Morgan for the balloon to land, and had made his way to the landing area. After a brief discussion with the Vineyard manager the teams were able to drive right to the payloads, which had landed across four rows of ripe grapevines.

The SHSSP payload, suspended between grapevines.

Mark’s team then headed on to Waikerie for a much needed Bakery visit!

Tracking & Telemetry

As usual, we had a good showing of Amateur Radio operators from around the state receiving telemetry from the balloon. It was good to see a few new callsigns tracking telemetry (Hi Liam!) as well as our regulars.

The flight had the usual RTTY and 4FSK payloads, the telemetry statistics of which are shown below:

RTTY Payload

CallsignReceived PacketsPercentage of Flight ReceivedFirst-Received Altitude (m)Last-Received Altitude (m)
VK5ALX28036.1%600722607
VK5EI45058.1%32179498
VK5EU69689.8%6791634
VK5FLPM70.9%28725823
VK5KIK65284.1%10892631
VK5KX38249.3%1622119
VK5PJ91.2%1890419707
VK5ST64783.5%30372151
VK5ZEA46560.0%60079373
VK5ZRL43355.9%105395554
VK5ZRL-0240452.1%105396068

4FSK (Binary) Payload

CallsignReceived PacketsPercentage of Flight ReceivedFirst-Received Altitude (m)Last-Received Altitude (m)
VK5APR146791.9%10912792
VK5FLPM61538.5%922712881
VK5KJP150494.2%10912003
VK5LJG1499.3%139710254
VK5LJG-946128.9%5401672
VK5NEX133383.5%28832882
VK5PJ64440.4%4841189
VK5QI-9148092.7%54025
VK5ST145090.9%16091844
VK5TRM129781.3%2389855

Thanks to all who participated!

Wenet Imagery Payloads

This flight featured two Wenet imagery payloads – one with a downward-facing camera, and one outward-facing (for nice horizon photos). For the most part, these were identical to the Wenet payloads flown in previous Horus launches. The downward-facing payload was also configured to to receive telemetry from a SHSSP-designed payload and relay it to the ground via the Wenet FSK downlink.

Even though it was quite cloudy, the two payloads were able to capture excellent imagery throughout the flight.

Thanks to the following receiving stations who contributed to the Wenet reception effort:

Downward Facing Imagery

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CallsignPackets ReceivedTotal Data Received (MiB)
VK5APR7457218.21
VK5DSP6043514.75
VK5EI296287.23
VK5KX68721.68
VK5QI (Mobile)338708.27

Outward Facing Imagery

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CallsignPackets ReceivedTotal Data Received (MiB)
VK5KX18080544.14
VK5QI (Mobile)9776223.87

SHSSP Payload – Radiation Monitoring

This year, the SHSSP decided to develop a payload to measure ionising radiation throughout the balloon flight. The majority of ionising radiation observed in the troposphere and stratosphere are a result of cosmic rays interacting with particles of air, producing showers of secondary particles which can be observed using radiation sensors.

Two radiation sensor types were used: a geiger-muller tube, and a PIN-diode-based sensor. Radiation detection events were logged by a Raspberry Pi Zero W, and relayed to the downward-facing Wenet payload for transmission to the ground throughout the flight.

From the flight data, Bill Cowley (VK5DSP) was able to create plots of radiation count vs altitude:

These plots show the ‘Regener-Pfotzer Maximum’ at ~18km altitude the characteristic peak in the distribution of charged particles in the atmosphere. Above this point the radiation intensity drops due to there being less atmosphere for cosmic ray interactions to occur; below it, the intensity drops due to secondary particles being blocked by denser atmosphere.  A full writeup of the payload and results are over on Bill Cowley’s blog.

Conclusion

With the usual excellent imagery from the Wenet payloads, and the good data from the SHSSP payload, this flight can definitely be considered a success – even with the early burst. Thanks again to all who participated, and we look forward to more Project Horus flights in the future!

Horus 52 - Flight Statistics

MetricResult
Flight Designation:Horus 52 - SHSSP 2019
Launch Date:2019-02-09 00:40 UTC
Landing Date:2019-02-09 02:38 UTC
Flight Duration:1 Hour 58 Minutes
Launch Site:-35.07668,138.85643
Landing Site:34.12273,139.871
Distance Traveled:140 km
Maximum Altitude:25,497 m

Horus 52 / SHSSP 2019 – Frequency & Tracking Data

Horus 52 – Saturday 9th February 11.00am Liftoff!

AREG is pleased to once again be involved with the International Space University’s Southern Hemisphere Space Studies Program hosted by the University of South Australia. This year one balloon is being launched from Mt Barker High School as part of the program. All amateurs across the state are invited to participate in the flight through collecting the RTTY telemetry. All you need is an SSB receiver on 70cm, and an interface to your computer. The rest is software!

You can find out more about the software you need to track the balloon via our software tracking page

Telemetry Payloads

As always, we’ll be flying the usual assortment of telemetry payloads, including:

  • Our usual 100 baud 7N2 RTTY telemetry on 434.650 MHz USB. This can be decoded using dl-fldigi, with a reception guide available hereNOTE: There is a known issue with dl-fldigi where it does not upload any received telemetry until about 10 minutes after the software is started. Any telemetry received in this time period will be queued and uploaded after the startup period has completed (i.e. no telemetry will be lost).Note: Recent testing of dl-fldigi’s decode performance has found that the auto-configured RTTY receive bandwidth is too narrow, and can detrimentally impact decode performance (by up to 3dB!).To fix this, open dl-fldigi, and in the Configure menu, select Modems, and then go to the ‘RTTY’ tab. Drag the ‘Receive filter bandwidth’ slider to 200, then click ‘Save’. Note that this setting will be reset whenever you hit the ‘Auto-Configure’ button!
  • 4FSK Telemetry decoder

    The new 4FSK Binary telemetry will be transmitting on 434.640 MHz USB. This uses a separate decoder, with setup instructions for this available here. We would love reports of how the 4FSK signal compares to standard RTTY!

 

Wenet Imagery Payloads

This flight will feature two ‘Wenet’ high-speed imagery payloads, as have been flown on many previous Horus launches. The centre frequencies for the transmissions are:

  • 441.200 MHz – Nadir-pointing (Downward) Imagery
  • 443.500 MHz – Horizon-pointing Imagery

These will be downlinking HD pictures throughout the flight, which will be available at this link:

http://ssdv.habhub.org/

Reception of the Wenet signal requires a RTLSDR and a Linux PC/Laptop. Instructions on how to set up the required software are available here.

Note that users running an ‘older’ version (Circa mid-2018) of the Wenet receiver software will need to apply a -220kHz offset to the above frequencies in their setup_rx.sh file (i.e. 440980000 or 443280000) – or just leave them at their defaults, which should already be correct.. Those running the latest version can just define the centre frequency as-is. Older versions of the Wenet software will show a lot of ‘Unknown Packet Type’ messages due to some new telemetry formats we are trialling on this flight.

Online Tracking

Tracking of the flight will be available on the HabHub Tracker, available at this link. (Note that other balloon launches will also be visible on this page, including the Bureau of Meteorology launches from Adelaide Airport).
Follow the #SHSSP hashtag on Twitter for updates from the launch and chase teams on the launch day.

Flight Prediction

The following will give you an idea of the expected flight track for Saturday. It is going to be a LONG chase this time! See you all on Saturday!

Horus 52 – On track for Saturday 9th Feb Launch

AREG is once again involved with the University of South Australia’s Southern Hemisphere Space Studies Program this year, which is run by UniSA on behalf of the International Space University. The launch, which was scrubbed last week due to the predicted landing zone is now planned for this coming Saturday 9th Feburary, with liftoff planned for ~11AM. The weather is looking much better!

The current predictions look as follows:

Payload Plans

While some details are still to be worked out, it’s looking like the following payloads will be flying:

  • RTTY – 434.650 MHz
  • 4FSK – 434.640 MHz
  • Wenet – 441.200 MHz  (downward facing images)
  • Wenet #2 – 443.5 MHz (horizon-facing images)

There is still a chance the second Wenet payload will be dropped from the launch due to weight restrictions, so if you don’t see any signal on 443.5 MHz, that’s what’s happened!

As always, amateurs from across the state are encouraged to take part, by collecting the telemetry data and relaying it to HabHub on the Internet. This data is used to help fill in any missing data the chase teams fail to capture, which they can use to help maximize their landing zone prediction accuracy. In that way, everyone taking part is adding to the success of the mission.

Tracking details will be provided closer to the launch. Keep watching the AREG website for details!