Test results of Litton's LN-90 series RLG INS

Data from tests on three generations of ring laser gyros (RLGs) are presented, including flight test data and extensive laboratory test results. Gyrocompassing repeatability under laboratory conditions for two different sizes of RLGs is shown, demonstrating an extremely low random walk parameter in recent models. Examples of system performance during static navigation performance, Scorsby motion, and following 180 degree turns are presented. Accuracy is shown to be near 0.5 nm/hr CEP under all conditions with velocity errors at about 2 ft/sec per axis, rms. Block diagrams of the hardware and software are provided.