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A dynamic calibration method for the lever-arm effect of the Strap-Down Inertial Navigation System (SINS) on hypersonic cruise vehicles is proposed. The lever-arm length is extended as the state variables of the Kalman filter; the model of the lever-arm effect is built, and observability is analyzed. Simulation results show that the proposed method can effectively calibrate the lever-arm length. The...
Turntable is an important part of rotation inertial navigation system (RINS). Due to machining accuracy, there exists certain angle error between vertical axis of the turntable and table rotation axis, which leads to table's vibration and further the loss of RINS's accuracy. Firstly, the error of turntable's vibration is modeled. And the analysis results show that inertial measurement unit (IMU) does...
The performance of the image matching arithmetic will affect the precision and dependability of the SAR vision matching aided navigation system. When the real-time SAR image is influenced by the noise badly, the image matching result will be affected greatly. In order to improve the performance of the image matching arithmetic, improved SIFT feature matching arithmetic based on the wavelet transform...
The error of the inertia navigation system can be modulated critically by using the real-time SAR image through image matching and positioning. The mismatching points are inevitable in the SAR aided navigation. In the integrated navigation, the measurement outliers will affect the filter seriously. In order to eliminate the effect of the mismatching points, combining the discontinuous working characteristics...
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