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So, the project has now been broken into several areas.
I decided to take the section we have called Filtering.
Basically the idea behind this sub-system is that it will filter the received signal of any noise and be left wit the reflected pulse which can then be used to determine train position.
My first obective is to identify all the possible areas were noise coild be created which could be imparted into the rails (therefore into our square wave (with highliy skewed duty cycle))
Below is a short list of what I think could be the main causes for noise within rails:
- Traction noise due to rectification
- Electrical equipment onboard train such as air conditioning
- power converters or other on-board equipment
- Mobile Phones?
- Overhead power lines in close proximity to rails
The traction noise is probably going to be my biggest source of noise right? As this is only a project and not an actual design I am thinking of limiting my outlook to only newer trains with IGBT controlled induction motors.
What I need to find out is what this noise looks like (electrically) so that I can start thinking of different ways to filter these out from my wanted signal.
If anyone has any information regarding these sources of noise and possible ways of filtering the noise then I would appreciate any input.
Thanks!
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