Analysis of Projection Accuracy of Synthetic Image in Combined Vision System
Combined Vision System (CVS) that provides pilots a combination display with synthetic image and enhanced real vision requires critical image alignment. However, airborne navigation sensors are not accurate enough to support ideal alignment of synthetic and real image in CVS naturally. In this paper we investigate the effects of aircraft position and attitude errors on the projection accuracy of synthetic image in CVS. The major contribution of this paper lies in two aspects. Firstly, a projection model is established and the probability distributions of pixel errors are estimated. Secondly, four simulation scenarios are developed to evaluate the effects of position and attitude errors on the projection accuracy. The experimental results show that aircraft attitude error has more significant impact than position error on the pixel projection accuracy. The impacts of yaw error and roll error on the pixel error of synthetic image are larger and belong to primary factors. The probability distribution of pixel error obeys Gaussian, but the standard deviation of pixel row error is greater than column error with the same aircraft position and attitude parameters.