High precise LINS based on temperature control combined with temperature compensation

The laser inertial navigation system (LINS) precision is impacted by ambient temperature. A new method combining the merits of temperature control and temperature compensation is presented. The temperature control technology is applied to the accelerometers, and two kinds of material pads are used to prevent the thermal energy of accelerometers from transmitting to laser gyro. The temperature control model of accelerometer is established by the experiments. The RBF artificial neural network and the least square method are used to found the laser gyro bias temperature compensation model. The experiments show that the new method could decrease the preheat time to 15 min, and it is much less than typical preheat time of common LINS with temperature control. Simultaneously, the new method only needs a one-axis table with temperature control box to complete INS temperature compensation. Through accelerometers temperature control and gyro temperature compensation, the azimuth alignment precision of LINS can achieve to the theoretical limitation, while the operating temperature range can be from -40°C to 60°C.