Abstract
A trajectory reference system based on the Global Positioning System (GPS) can be used instead of conventional radars during missile flight tests. The high quality of the GPS-based trajectory reference makes it useful for evaluating the performance of the missiles' inertial measurement units. Such a system was installed and flight tested on two recently launched ballistic missiles. The GPS hardware configuration used on these flights is described. A Kalman filter approach is used to estimate individual inertial measurement unit errors based on the GPS range and delta range data. The ability of the GPS-based system to identify inertial measurement unit errors is compared to that of radar; the GPS is found to provide superior estimates.
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