Study on project trajectory of air-to-ground missile with strapdown seeker under multi constraints

Abstract

The air-to-ground missile with strapdown seeker may have the problems, including small field of view(FOV), limited overload, and fall angle constraint. To solve the above mentioned problem, a phased guidance scheme is proposed. In this scheme, the attack trajectory is divided into the following six stages, including glided stage, fall angle constraint stage, target acquisition and adjustment stage, terminal guidance stage and blind zone stage. The glided stage is designed to increase range, the terminal fall angle is attained ahead of time at fall angle constraint stage. The aim of target acquisition and adjustment stage is to adjust the missile attitude, so that the target will fall within the FOV of the seeker. It creates good condition to capture the target for strapdown seeker. In the terminal stage, the guidance law of proportional navigation and attitude track are used to fit the needs of FOV constraint and attack accuracy. The simulation result shows that the project trajectory can solve the application of attacking moving targets for air-to-ground missile with strapdown seeker under multi constraints.

Tibetan Elements in Dongba and Daba Spirits’ Names

“…It consists of sar ('to know') and mame ('honorific title for female'; Tong, 1989, p. 204). In Manchu, saman consists of the root sam ('see') and the suffix an, which means 'the person knowing' (Zhao, 2002). Purzzee Samei, with its Bon origin, traces back the Dongba culture to a time when Shamanism was a popular primitive belief in Eurasia (Ermakov, 2008).…”