Patrick Hammer
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  • Cheltenham, Gloucestershire County
  • United Kingdom
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Patrick Hammer's Discussions

ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?

Started this discussion. Last reply by Erik Hatch Mar 30, 2011. 9 Replies

A long standing issue flying RC/UAV models in so-called “commercial airspace” has been the issue of safety associated with “situational awareness” i.e the ability of an  RC/UAV model to unilaterally…Continue

SOME NOTES ABOUT IR CAMERAS

Started Sep 12, 2010 0 Replies

A note regards IR cameras .........IR cams are not cheap pieces of hardware – usually beyond the budget of DIY’ers and hobby flyers – or, need they be?Most IR cams are sold through resellers i.e.…Continue

INTEGRATOR UAV (by Insitu – now part of Boeing)

Started this discussion. Last reply by Patrick Hammer Aug 26, 2010. 18 Replies

Hi GuysDoes anyone have any model plans for the INTEGRATOR UAV?Anyone have any idea what the wing sweep angle is on this airframe (?) – have looked high and low on the internet, but like most unique…Continue

WHICH WING - REAR DELTA with FRONT CANARD?

Started this discussion. Last reply by Vladimir Popov Oct 25, 2010. 3 Replies

Some questions ...............I’m in the early stages of investigating different airframe possibilities – looking at the pros & cons of different layouts, shapes, sizes, wing profiles etc etc …………Continue

 

Patrick Hammer's Page

Latest Activity

Erik Hatch replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"TCAS"
Mar 30, 2011
Patrick Hammer replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Antenna side of it, yes - the rest of it, no!!"
Nov 15, 2010
Bertrand Duchiron replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Good luck for your project, you should have a very good knowledge in RADAR and electronic to modify this marine unit into a sensing device for UAV, I will follow your progress, will be very interesting."
Nov 14, 2010
Patrick Hammer replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Bertrand The reason why I focused in on the NAVICO system is because it is commercial and avaliable off-the-shelf product. All the individual components that make up the system from signal generation/modulation, through to reception/demod, signal…"
Nov 14, 2010
Bertrand Duchiron replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Well there is SAR UWB radar DIY that cost only 250$ , you can check this site for more info http://mrvacuumtube.blogspot.com/ The advantage of UWB is the low power consumption, few components and weight. The off the shelf unit currently use are…"
Nov 14, 2010
Patrick Hammer replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Marine Radar and 7.4 kg, not for UAV usage - issues regards certification? That will be an obstacle to be overcome and I haven't a clue what would need to be satisfied. I doubt NAVICO would support "hacking" their product for such an…"
Nov 14, 2010

Moderator
Gary Mortimer replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"7.2 Kg that takes the sUAS straight into the second tier of regulation in the UK before even adding an airframe and real payload. Better make it 1kg and things will be better. Also its not Commercial airspace, its airspace."
Nov 14, 2010

Moderator
John Church replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Or, possibly soon, a Kinect..."
Nov 14, 2010
Bertrand Duchiron replied to Patrick Hammer's discussion ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?
"Marine Radar and 7.4 kg, not for UAV usage. For the 'sense and avoid' better use of Laser (there is some good papers on this method) or maybe UWB radar (DIY schematic can be found on the web)"
Nov 14, 2010
Patrick Hammer posted a discussion

ONBOARD AVOIDANCE RADAR - NOW POSSIBLE?

A long standing issue flying RC/UAV models in so-called “commercial airspace” has been the issue of safety associated with “situational awareness” i.e the ability of an  RC/UAV model to unilaterally institute an “avoidance procedure”. Till that issue is addressed. the potential threat models pose to other aircraft/microlights/gliders/para-gliders etc etc …. remains an obstacle to greater freedom in & usage of airspace. Could resolving that issue perhaps be a little closer? NAVICO recently…See More
Nov 14, 2010
Vladimir Popov replied to Patrick Hammer's discussion WHICH WING - REAR DELTA with FRONT CANARD?
"There are some aerodynamic schemes and their tuning parameters to avoid stall. Integral fuselage, forward-swept wing, different wing profile from root to tips and so on. The "Canard" scheme more efficiently use the carrying surface - a…"
Oct 25, 2010
Patrick Hammer commented on Earl's blog post The perfect anti-vibration foam
"I don't think it was ever decided 100% one way or the other what "killed Columbia" i.e. foam, or foam & ice, or just ice, or a heat resitant tile. The jury is still out. In any event it wasn't Sorbathane - there is none on…"
Oct 6, 2010
Patrick Hammer replied to Gerard Lavoie's discussion Sub meter accuracy for the Arducopter GPS?
"Gerard If you read the notes at the end of all the marketing blurb - and it becomes clear that the sub-meter accuracy referred to is subject to certain conditions - as it is with most modern day GPS modules with half decent firmware and onboard…"
Oct 6, 2010
Patrick Hammer commented on Earl's blog post The perfect anti-vibration foam
"As others have already said - Sorbathan: used tons of the stuff at work over the years. Good enough for Nasa cameras on the shuttle, should be good enough for RC models."
Oct 6, 2010
Patrick Hammer commented on Mario's blog post I was already crazy...DIYDRONES made it worst ! The story...part 2
"Mario Brilliant - you not a little worried about the gear noise (?) - what material have you hobb'd the gears out of?? Meldin 5000 (engineering plastic) - great for small gears"
Oct 1, 2010
Patrick Hammer replied to Roberto Hawkowski's discussion High definition FPV
"For those interested - a hack for live video output (read “live” to mean “low latency” in reality) for the HD HERO already exists – done by my son and a university collegue of his - via a USB.2 extension cable/adaptor…"
Sep 25, 2010

Profile Information

About Me:
Just retired after 38 years in the European defence industry - in antenna research/design and development. Last 10 years with emphasis on research into airborne DSP (digital signal processing) hardware & UWB's (ultra wideband antennas). Final projects prior to retirement: design and development of antennas for the EADS Typhoon and A400M projects.

Knowledge of UAV's - limited to negligable I'm afraid, other than for research into antennas for data links.

The DIY DRONES website is a great database for homespun & open-source UAV projects and UAV design/development and control - however, when it comes to antenna's, there appears to be a big gap. I'd like to see myself been able to contribute significantly to that side of things.

Anyone have any question/s about antenna's - would be happy to comment and share my experience and ideas.
Please tell us a bit about your UAV interest
Have always had an interest in R/C models and model building - but never had much time to pursue the interest. Now have the time to get involved and starting off by getting up to date with the current "state of play" regards R/C & FPV technology.
Hometown:
Cheltenham

Comment Wall (2 comments)

At 6:56pm on August 24, 2010,
Developer
Mark Colwell
said…
I want to build a 910 Mhz Quad to send TM and video. I have access to lots of surplus Rf parts. I started with a tissue tube and wrapped 1.5 mm wire to form helix. i have not tested it yet. I think foil vs wire would work and be easier to fabricate too.. I look forward to your posts. I was Electronic Tech in US Navy served in Scotland 3 years communications and radar. Then went on to systems flight testing at Edwards AFB, Planned testing of all B-2s Cularis is a great plane to start with just have a experienced RC pilot guide you.
At 1:31am on August 25, 2010, Patrick Hammer said…
Hi Mark

Whats the tube made out of? - you realise that the dielectric constant of the tube material is going to result in you having to reduce the tube dia. by about 25% - 30% if you want to maintain tuned resonance for 910Mhz. It'll still work if you maintain dimensions for 910Mhz - no prob's there but I suspect your SWR will be way off ideal. Slit the tube lengthways and reduce the dia so its resonent for around 1300Mhz - that'll work much better.

Foil won;t make much difference - should work just as well. SWR is th big issue when making a DIY helix. Good luck....... and make sure you have a decent reflector at the back. Should work just fine.

My neighbor has lots of RC flying experience - I've roped him in for a few weekends. One I've got the idea of things I'll give thought to building a larger model.

Regards

Patrick.

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