SYSTEM AND METHOD FOR ESTIMATING SPEED OF A VEHICLE

System and method for estimating speed of a vehicle is disclosed. Speed of a vehicle is recorded using a first sensor at a time interval of a plurality of time intervals. The first sensor can be a GPS sensor delivering velocity data. Further, an acceleration of the vehicle may be recorded using a second sensor at each sub-interval of the time interval. The second sensor can be a MEMS accelerometer. At each sub-interval, a forward speed and a backward speed of the vehicle are obtained based upon the acceleration at each sub-interval. The forward speed is determined by adding the integrated sub-interval acceleration values to the first sensor value present at the start of the time interval. The backward speed is obtained by subtracting the integrated sub-interval acceleration values from the first sensor value present at the end of the time interval. After obtaining the forward speed and the backward speed, a predefined weight may be assigned to the forward speed and the backward speed at each sub-interval. Subsequently, a corrected speed of the vehicle at each sub-interval is calculated from a weighted sum of the forward speed and the backward speed. Further, a change of speed during the time intervals is determined from the difference of the speed data of the first sensor. Based upon the slope, a choice can be made between different algorithms for determining the speed of the vehicle at each sub-interval, e.g using the weighted sum or the maximum or minimum value of the forward and backward speed.