This paper describes some new performance analysis methods, developed by the authors, for use in characterizing laser gyro system performance. Past analysis methods used by laser gyro evaluators consisted of time base averaging of pulse data over 10 to 100 second periods. When it became necessary to process data in shorter time periods such as 10 millisec and less, the time base technique introduced greater instantaneous rate deviations. This larger scattering of data results in higher processing noise, which in turn results in higher indicated random drift performance. The technique explored by the authors involves the use of Fast Fourier Transforms (FFT) to analyze per-formance in the frequency domain. In addition to examining static performance, the FFT method is also applied to dynamic tests. Finally, the FFT method provides the basis for transfer function analysis of the laser gyro.
James V. Johnston,
W. Gene Cantrell,
"New Techniques in Laser Gyro Performance Analysis", Proc. SPIE 0157, Laser Inertial Rotation Sensors, (15 December 1978); doi: 10.1117/12.965484; https://doi.org/10.1117/12.965484