GPS Signal Quality Based on Short Baseline Three-Antenna Common-Clock

In the past 5 years, the innovation technology about the dual-antenna common-clock was promoted and the performance in the relative static platform because the baseline is near 1 meter. The Common clock means that the common crystal oscillator of the GNSS dual receiver sends the same pulse signal simultaneously. The GNSS dual receiver can realize to acquire data synchronously from the different antennas. One benefit of using a common clock reference is that the clock error is the same for all RF signals including carrier phase measurements, and thus it can be removed by forming single differences. It is obvious that the single difference can be optimized and the accuracy of attitude determination can be further improved. So, the common-clock is adopted in more than two GNSS receivers and the carrier phase single difference can get the same technical effects as the double difference. This paper expresses in detail mathematical model method and some experiments, especially for GPS three-antenna short baseline system. The related research work is conducted through the car and UAV platform, such as GPS signal quality, and attitude. It is shown that the performance is more stable in the overall flight situation.