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
Vehicle Backup Detection
Started by ●May 19, 2010
Reply by ●May 19, 20102010-05-19
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
Reply by ●May 19, 20102010-05-19
On 19 Mai, 22:44, "arvkr" <krarvind@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 > arvkrYou 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
Reply by ●May 19, 20102010-05-19
Rune Allnor wrote:> On 19 Mai, 22:44, "arvkr" <krarvind@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
Reply by ●May 19, 20102010-05-19
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. > > VLVI 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
Reply by ●May 19, 20102010-05-19
Eric Jacobsen <eric.jacobsen@ieee.org> wrote:>On 5/19/2010 2:01 PM, Vladimir Vassilevsky wrote:>> Connect to the rear lights.>I think a bunch of cameras on the roof pointed at the sky with a really >accurate celestial navigation scheme would work.How about pitot tubes? Steve
Reply by ●May 19, 20102010-05-19
On 5/19/2010 4:18 PM, Steve Pope wrote:> Eric Jacobsen<eric.jacobsen@ieee.org> wrote: > >> On 5/19/2010 2:01 PM, Vladimir Vassilevsky wrote: > >>> Connect to the rear lights. > >> I think a bunch of cameras on the roof pointed at the sky with a really >> accurate celestial navigation scheme would work. > > How about pitot tubes? > > SteveIf one put an anemometer and wind vane on the roof to compensate for wind then that might work, too. -- Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com
Reply by ●May 19, 20102010-05-19
On 5/19/2010 7:14 PM, Eric Jacobsen wrote:> 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.Nah. That fails in a fog. Jerry -- "I view the progress of science as ... the slow erosion of the tendency to dichotomize." --Barbara Smuts, U. Mich. �����������������������������������������������������������������������
Reply by ●May 20, 20102010-05-20
On 19.5.10 11:44 , 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. I > also have accurate measurements of velocity from a wheel speed sensor. > Cheers > arvkrGet the contents of an optical mouse and point at ground. -- Tauno Voipio
Reply by ●May 20, 20102010-05-20
>Rune Allnor wrote: >> On 19 Mai, 22:44, "arvkr" <krarvind@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. >Unfortunately its just a pulse train. Can't use optical or other sensors. Acceleromter and Compass data is all i have apart from the pulse train wheel speed sensor output.
