Test facilities and procedures for strapdown systems

Test procedures for determining the error coefficients of strapdown sensor error models are discussed, and the test facilities used are described. Attention is given to a three axial motion simulator and control and data acquisition. The system tested was a functional prototype consisting of an inertial measurement unit, interface unit, digital computer, and power supply. The rate test is taken to measure the gyro scale factors, nonlinearity of gyro scale factors, and the angular misalignments of gyro axes. The purpose of a multiposition test is to measure deterministic error coefficients of gyros as well as those of accelerometers. Dynamic sensor errors and system errors are measured in dynamic tests along with system performance under simulated vehicle mission profiles.