Abstract
For the rapid response of the aircraft, it is required that the aircraft is not only quick but also chooses the shortest flight routes. The great circle track is the shortest flight route on the earth between any two points, but the great circle track needs to cross the polar region when the aircraft flies over the hemispheres of East and West. Because the polar region has some particularity, such as the landform characteristics, the climatic conditions, and the vast territory, the transpolar aircraft is the key technology of global navigation. This article researched on the algorithm of SINS/GPS integrated navigation system and analyzed the result of simulation when the SINS/GPS integrated navigation system works in the middle- and low-latitude region and the polar region. The result of simulation shows that the working performance of SINS/GPS integrated navigation system is improved and makes use of their respective advantages to overcome the shortcomings. By comparing the result of simulation, the navi...
Highlights
Because of the special geographical position of the polar region, the inertial navigation system (INS) can only calculate the matrix of position and attitude, but cannot obtain the position and attitude
The main reason is the longitudinal convergence of a point in the polar regions
The position of GPS and strapdown inertial navigation system (SINS) is based on the earth-centered earth-fixed (ECEF)
Summary
Because of the special geographical position of the polar region, the inertial navigation system (INS) can only calculate the matrix of position and attitude, but cannot obtain the position and attitude. Based on the error state equation of SINS, the state variables of SINS/GPS are selected as follows: du, du, dg is the attitude error of SINS; dvE, dvN , dvU is the velocity error of SINS; dL, dl, dh is the position error of SINS; ebx, eby, ebz is the random constant drifts of gyroscope; and rbx, rby, rbz is the random error of accelerometer. The observed quantity is the difference of flight parameters which are velocity and position between SINS and GPS, so the measurement of SINS/GPS is.
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