Computer Science & Electronics Journals
The NAVSTAR Global Positioning System (GPS) used in worldwide provides position information at any point at anytime, anywhere on earth in the form of longitude, latitude and altitude. The GPS accuracy may be affected by various inherent error sources such as satellite errors, receiver clock errors and orbital errors etc. In this paper, digital signal processing techniques such as Bad Data Identification and Modification (BDIM) technique and Kalman filter has been used to enhance the accuracy of GPS altitude. In this paper, the Kalman filter after BDIM significantly reduced the errors in GPS measurements.