Making GPS more accurate and/or reliable by combining it with other sensors and applying sophisticated
data processing techniques has been attempted many times. Our approach to enhancing the performance
of GPS is much simpler than most. We combine multiple (up to eight) consumer-grade GPS receivers into
a system that averages their data in real time, requiring no other sensors, augmentation technologies, or
powerful processors. The results show significant improvement in both accuracy and reliability of the
data over that of a single receiver, and the distribution of error more closely resembles the normal distribution
(as compared to a single receiver). Our multi-GPS system shows potential to be an inexpensive
way to achieve better GPS performance with only ‘‘off-the-shelf” equipment.