Sensitivity Level Enhancement in Vehicular DGPS Receivers to Provide Exact Location Tracking on Sub-lane of a Highway

The GPS data received by a receiver, embedded into a moving vehicle, encounter the distance inaccuracy due to close-in multipath of reflected signals of adjacent moving vehicles. The said inaccuracy cause a failure of sub-lane detection of the vehicle that pass through a specific lane. Increasing the sensitivity level of the received signals, the inaccuracy can be controlled up to a great extent. In this paper we are interested in finding out the best condition to enhance the sensitivity level of received symbols. This is achieved through up-gradation of probability of detection of the received signals. Similarly, the process is refined up to a great extent by selecting the best discriminator function response (DFR) for the purpose of decreasing root mean square error (RMSE). Moreover, the best DFR is selected in order to increase the convergence rate for a certain discriminator which results in increase of sensitivity level of the received GPS symbols. The best optimized solution provides up to 4cm accuracy in selected DGPS receiver.