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Li S.-Q.,Wuhan Naval University of Engineering | Li S.-Q.,Hydrographic Surveying and Charting Institute | Ouyang Y.-Z.,Hydrographic Surveying and Charting Institute | Chang G.-B.,Hydrographic Surveying and Charting Institute | And 2 more authors.
Zhongguo Guanxing Jishu Xuebao/Journal of Chinese Inertial Technology | Year: 2012

The influence of gravity disturbance vector can't be neglected in high-accuracy inertial navigation system. In this paper, the error equation of inertial navigation system regarding gravity disturbance vector was established and simulated with high-grade inertial sensors (gyro bias instability is 0.001deg/h, and accelerometer bias instability is 0.01 mg). Two conditions were considered in the simulation: one with gravity disturbance vector compensation (the deflection of vector was 1.6″, and the gravity anomaly was 2 mGal), the other without (the deflection of vector was 5-10″ and the gravity anomaly was 25-50 mGal). It is concluded that the position and heading errors of the inertial navigation can be reduced by 2 n mile and 1′, respectively, with the gravity disturbance vector compensation. Source

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