GPS interferometery utilizes data acquired from multiple GPS antennas which are placed at some fixed distance from each other and calculates the resulting heading based on carrier phase measurements. Typical GPS interferometers make use of two antennas at baselines from 0.5 to 1m and have been shown to achieve azimuth accuracy in the range of 0.5deg or better. However such configurations are very susceptible to errors related to the pitch of the object under measure.
For weapon systems, such as towed artillery and mortars, this approach is really not practical as a means of tracking barrel orientation as these weapons have a total pitch range of greater than 40deg. Inertial Labs is currently developing a GPS interferometer that makes use of three antennas mounted in a triangular formation with a 0.5m baseline between the antennas. Such a configuration will allow for large variations in pitch while still being able to maintain a solid baseline for determining heading. Additionally, using three antennas provides and ability to average data from three different antenna combinations to provide a more accurate azimuth result.
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