Vehicle Backup Detection
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From: arvkr on 19 May 2010 16:44 Hello All, Looking for some advice on how to detect if a vehicle is backing up (reversing) using measurements from a 3 axis accelerometer and compass. I also have accurate measurements of velocity from a wheel speed sensor. Cheers arvkr
From: Vladimir Vassilevsky on 19 May 2010 17:01 arvkr wrote: > Hello All, > Looking for some advice on how to detect if a vehicle is backing up > (reversing) using measurements from a 3 axis accelerometer and compass. Forget about it. > also have accurate measurements of velocity from a wheel speed sensor. Connect to the rear lights. VLV
From: Rune Allnor on 19 May 2010 17:02 On 19 Mai, 22:44, "arvkr" <krarvind(a)n_o_s_p_a_m.gmail.com> wrote: > Hello All, > Looking for some advice on how to detect if a vehicle is backing up > (reversing) using measurements from a 3 axis accelerometer and compass. I > also have accurate measurements of velocity from a wheel speed sensor. > Cheers > arvkr You only need the wheel speed detector. Look at the sign of the speed: Positive speed is forward; negative speed is reverse. Or vice versa. Rune
From: Tim Wescott on 19 May 2010 18:41 Rune Allnor wrote: > On 19 Mai, 22:44, "arvkr" <krarvind(a)n_o_s_p_a_m.gmail.com> wrote: >> Hello All, >> Looking for some advice on how to detect if a vehicle is backing up >> (reversing) using measurements from a 3 axis accelerometer and compass. I >> also have accurate measurements of velocity from a wheel speed sensor. >> Cheers >> arvkr > > You only need the wheel speed detector. Look at the sign of the speed: > Positive speed is forward; negative speed is reverse. Or vice versa. Assuming that the wheel speed is signed, and not just a pulse train. But yes, that's the way to do it. You can't really do it inertially without aid from GPS or similar, and even then it's a huge research project to get it going -- and it doesn't work if you're in a tunnel, or parking garage, or what not. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: Eric Jacobsen on 19 May 2010 19:14
On 5/19/2010 2:01 PM, Vladimir Vassilevsky wrote: > > > arvkr wrote: > >> Hello All, >> Looking for some advice on how to detect if a vehicle is backing up >> (reversing) using measurements from a 3 axis accelerometer and compass. > > Forget about it. > >> also have accurate measurements of velocity from a wheel speed sensor. > > Connect to the rear lights. > > VLV I think a bunch of cameras on the roof pointed at the sky with a really accurate celestial navigation scheme would work. -- Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com |