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mrbean_phillip · 11-09-2007, 01:15 AM

@ Sreeja: DR is a method, by using gyro(s) to determine vehicle movement, sideways, forward, back, up or down (aircraft for example) - it is based on (a) piezo-electric crystal(s), where movement will generate an electric current, amplified by electronics, and fed into any electronic system that can make use of these signals.

So, at rest, the signal will be 0Volts, and going in 1 direction will generate a positive offset (from 0V), and moving in the opposite direction will generate a negative offset referenced to 0V.

Take a 2 axis gyro - it can determine forward/backwards, and left/right movement, on two independant axis....so, when the GPS signal is not available due to travelling between high buildings, in a tunnel, or something, the gyro provide the signal to the GPS circuitry, giving it a fair idea which direction you are travelling.

And, by measuring car speedo signal, and reverse signal, it can quite accurately deduce a useable signal for your GPS without the satellites....

I hope this makes it a little more clear?

@ Thwack: Ijust received both your PM's, and replied!

Thanx,
MrBean.

11-09-2007, 01:15 AM	#124
mrbean_phillip Variable Bitrate mrbean_phillip's CarPC Specs Join Date: Feb 2006 Location: Melbourne, Australia Vehicle: Ford F6 Tornado UTE Posts: 401 My Photos: ()	@ Sreeja: DR is a method, by using gyro(s) to determine vehicle movement, sideways, forward, back, up or down (aircraft for example) - it is based on (a) piezo-electric crystal(s), where movement will generate an electric current, amplified by electronics, and fed into any electronic system that can make use of these signals. So, at rest, the signal will be 0Volts, and going in 1 direction will generate a positive offset (from 0V), and moving in the opposite direction will generate a negative offset referenced to 0V. Take a 2 axis gyro - it can determine forward/backwards, and left/right movement, on two independant axis....so, when the GPS signal is not available due to travelling between high buildings, in a tunnel, or something, the gyro provide the signal to the GPS circuitry, giving it a fair idea which direction you are travelling. And, by measuring car speedo signal, and reverse signal, it can quite accurately deduce a useable signal for your GPS without the satellites.... I hope this makes it a little more clear? @ Thwack: Ijust received both your PM's, and replied! Thanx, MrBean. __________________ F6 Tornado Project Log - nearing completion Last edited by mrbean_phillip; 11-09-2007 at 01:17 AM.