HobbyKing.com New Products Flash Sale
Reply
Thread Tools
This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies.
Old Aug 24, 2012, 05:43 PM
Registered User
Jack Crossfire's Avatar
Calif*
Joined Sep 2006
2,110 Posts
Discussion
Sonar flights conclude

Some more sonar ideas were scanning for a peak only within a few samples of the previous peak, finding the start of the peak by searching for the 1st positive derivative or the last point to exceed the maximum before the current peak. How would you find the last point to exceed the maximum? Some pings ware pretty nasty, with maximums set & dropped below. There were more diabolical pattern matching algorithms.

Nothing about sonar jumped out as bulletproof, while vision has already been proven in the dark. A simple test to separate a blinking LED from the background would seal it.

Ramped the sonar up to 60hz on the sending side, giving 20hz position solutions. Had the starts of pings detected from the derivative. When it was in a box directly over the ground array, it was actually very stable. The instant it got out of range, it died. It still didn't have the horizontal range, but the speed & accuracy required for stable flight were shown.

That was a lot of investment in electronics. It was the mane reason for the oscilloscope.
Jack Crossfire is offline Find More Posts by Jack Crossfire
RCG Plus Member
Last edited by Jack Crossfire; Aug 24, 2012 at 07:40 PM.
Reply With Quote
Sign up now
to remove ads between posts
Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Flight controller with Sonar collision avoidance and selected features kryptoknight Multirotor Talk 2 Aug 19, 2011 09:04 AM
Discussion 2008 Viking Race concludes. slopetrashuk Slope 15 Sep 08, 2008 09:13 AM
For Sale Trade concluded. Plastic_Avatar Aircraft - Electric - Micro & Indoor Airplanes (FS/W) 9 Jun 29, 2008 11:06 AM