The Application of the Vibration Absorber in Laser Inertial Navigation Products

Abstract

The navigation accuracy of laser strap-down inertial navigation products declines with gyro dither, which is a bottleneck problem for the development of the important aviation instrument. The reason is that the dither of three gyros in the product couples and generates extra noise in the output signals of gyros. To decouple dither, this paper applies the vibration absorber in laser inertial navigation products. First of all, an angular vibration model of the three-rigid body system, which is constructed by the gyro, platform, and vibration absorber, is established. Then, the theoretical restriction of the absorber and the system response are derived. Finally, considering the power limitation for dither, the total power of the vibration system is analyzed. The analytical and experimental results show that the efficiency of the vibration absorber only relates to the frequency offset with gyros, and the absorber does lead to a sharp power increase.

Zero-bias error compensation method of laser gyro based on neural network

“…At present, higher requirements are put forward for the accuracy of gyroscope at home and abroad, which is limited by the use environment, assembly process, manufacturing, material performance and other reasons. The main solution is to optimise the accuracy of the system and calculate effective compensation through the compensation technology and data pre-processing technology of computer software (Yang et al, 2021;Cheng et al, 2021;Tao et al, 2019). Different from the traditional gyroscope, laser gyro has the advantages of large measurement range, strong impact resistance and high precision, but it still has the problem of high economic cost.…”