Patent ID: 9639999
Date: 2017-05-02
CPC Classifications: B60W,G01C,G01P,G07C

Claim:
1. A method for estimating speed of a vehicle, the method comprising: recording, by a processor, a speed of a vehicle using a first sensor at a time interval of a plurality of time intervals and at each sub-interval of the time interval; recording, by the processor, an acceleration of the vehicle using a second sensor, wherein the acceleration is recorded at the each sub-interval of the time interval; obtaining, by the processor, a forward speed and a backward speed, of the vehicle at the each sub-interval based upon the acceleration at the each sub-interval; assigning, by the processor, a pre-defined weight to the forward speed and the backward speed at the each sub-interval; calculating, by the processor, a corrected speed of the vehicle at the each subinterval based upon the predefined weight, the forward speed and the backward speed; determining, by the processor, a slope associated with the speed of the vehicle, wherein the slope indicates change in the speed of the vehicle between the plurality of time intervals; and estimating, by the processor, the speed of the vehicle at a sub-interval based upon the slope, wherein the speed is estimated using one of the following: corrected speed at the sub-interval, a minimum of the forward speed and the backward speed in the time interval, and a maximum of the forward speed and the backward speed in the time interval, wherein the speed is estimated using the maximum of the forward speed and the backward speed in the time interval when the change in the speed increases between the plurality of time intervals; and wherein the speed is estimated using the minimum of the forward speed and the backward speed in the time interval when the change in the speed decreases between the plurality of time intervals.