Thursday 19 November 2009

Carbon Fibre blocks GPS Signals?

This an extract taken from an enquiry I received via the UK Telematics Online website and my subsequent response. 

Question:
One other thing, which is slightly off track, is do you know anything about how carbon fibre affects GPS signals? I was having a discussion about this with a tutor from the school of art who insists carbon fibre would be detrimental to GPS effectiveness, however, I have doubts that a few mm or so would be significantly restrictive.


Answer:  In all honesty I was ignorant of the possibility that Carbon Fibre can block GPS signals.  Although, I’ve now just done a quick Google search and there were several items where people were discussing the issue, but in my brief search, I didn’t come across any empirical evidence.

However,  it is common practice in vehicle telematics, where a device could be installed deep inside the structure of a car or lorry and GPS reception could be degraded, to attach external antennas to the device.  This was accepted practice with most devices that use a SIRF II type GPS module and good practice. even today, where the latest devices will use a SIRF III type module.  The device could be installed in the bowels of the dashboard, but the antenna might, for example, be mounted behind the upholstery of the roof arm.  There is an article on GPS Passion which discuss the merits of various GPS receivers.

This link is to a Chinese manufacturer I came across while Googling, who happened to have an array of external GPS antennas.   This link discusses making your own external GPS antenna. 

If anyone has any comments or additional helpful information, please free to submit a post.

Regular topic and content updates are available here or shown now in full over at What are Vehicle Telematics and Vehicle Tracking? on the UK Telematics Online website.

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