| http://www.w3.org/ns/prov#value | - By making heading determinations based upon measurements from each of the four transceivers 46 a-d on-board vehicle 20, six different heading measurements can be made. (The four transceivers 46 a-d can be combined into six different unordered pairs, and each unordered pair used to calculate the vehicle's heading.) Combining these six measurements, such as by averaging, can yield an improvement in
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