[Canberrauav] flying today (sonar testing) Andrew Tridgell tridge at samba.org Wed Oct 30 23:37:46 UTC 2013 Hi All, Pat Hickey (the original author of the AP_HAL portability layer for APM) is visiting Canberra today. Jack, Pat and I are planning to do some test flights at CMAC this afternoon. The main aim of the test flights is to see if an analog sonar works for landing altitude. I have mounted a Maxbotix analog sonar on my AcroWot, and setup ArduPlane to log the sonar data at 50Hz to the SD card and 10Hz over MAVLink. We will probably find that the prop wash and doppler shift makes the sonar impractical, but I'd like to do the test. We'll try some deadstick landings as well in case that makes a difference (no prop wash). Cheers, Tridge
[Canberrauav] sonar test results Andrew Tridgell andrew at tridgell.net Thu Oct 31 22:17:31 UTC 2013 We had a good day testing the sonar on the AcroWot yesterday. Some results and logs are here: http://uav.tridgell.net/Sonar-tests/ We are clearly going to need some good filtering, but I think we can make it work. The sonar is a Maxbotix MB1240 Cheers, Tridge
[Canberrauav] sonar test results Bruce Baxter bruce.baxter at bbsolutions.biz Fri Nov 1 00:23:34 UTC 2013 I like your results very much. Not sure how you wish to implement the sensor, but the aircraft doesn't need to know how far from the ground until it hits ground effect. Your sensor seems to work extremely well from 1-2 m about the level of ground effect. Great time to go to idle and hold pitch and let it sink down from 0.5m On Friday, November 1, 2013, Andrew Tridgell wrote: > We had a good day testing the sonar on the AcroWot yesterday. > > Some results and logs are here: > > http://uav.tridgell.net/Sonar-tests/ > > We are clearly going to need some good filtering, but I think we can > make it work. > > The sonar is a Maxbotix MB1240 > > Cheers, Tridge > _______________________________________________ > Canberrauav mailing list > Canberrauav at canberrauav.com < javascript:;> > http://www.canberrauav.com/mailman/listinfo/canberrauav > -- *Bruce Baxter* *0422 570 449** * *Bruce Baxter Solutions* * *
[Canberrauav] sonar test results Jack Pittar jpittar at bigpond.net.au Fri Nov 1 04:20:39 UTC 2013 With filtering it would work reliably at medium to low speed, below 5 Metres, only over a non grass surface. Good for: The APM knowing when the plane is in the air/flying Flaring when landing Avoiding a landing before the strip is reached Knowing when to deploy/retract the camera Jack. -----Original Message----- From: canberrauav-bounces at canberrauav.com [mailto:canberrauav-bounces at canberrauav.com]On Behalf Of Andrew Tridgell Sent: Friday, 1 November 2013 9:18 AM To: canberrauav at canberrauav.com Cc: Pat Hickey; p_riseborough at live.com.au Subject: [Canberrauav] sonar test results We had a good day testing the sonar on the AcroWot yesterday. Some results and logs are here: http://uav.tridgell.net/Sonar-tests/ We are clearly going to need some good filtering, but I think we can make it work. The sonar is a Maxbotix MB1240 Cheers, Tridge
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