无人机身倾斜姿态下的GPS定位模型仿真

Simulation of GPS Positioning Model in Unmanned Aerial Vehicle with Tilted Posture

研究无人机身倾斜姿态下的GPS定位性能优化问题,关系到无人机的定位性能。无人机身倾斜姿态飞行状态下,定位的GPS信号随着飞行速度的变化,发生实时的变化,当无人机倾斜飞行时,由于GPS信号会被机身倾斜角度遮挡,导致采集过程出现信息间断,给定位过程带来了较强的屏蔽性干扰。传统的定位方法需要对所有定位信息排序分析,对GPS定位信息的实时性要求较高,倾斜采集信息受到倾斜角度遮挡的影响,定位速度慢且容易出现无人机定位请求无法实现的现象。提出一种采用多维空间选择进化法的无人机GPS快速定位模型,根据无人机身倾斜姿态下飞行中搜索的信息数据,将搜索的目标智能化分为多个字段,建立多个空间,对多个空间进行曲径选择进化,提取目标的深层次特征,依据深层次特征,在资源库中进行检索,提高对无人机身倾斜姿态下信息定位的时效性和准确性。仿真结果显示,将多维空间选择进化法应用于无人机身倾斜姿态下的地理数据定位,可以提高定位时效性和准确性。

The performance optimization of GPS positioning under the tilted posture of fuselage is studied which is related with the performance of unmanned aerial vehicle （UAV） positioning. In the condition of tilted posture flight of UAV＇s fuselage, signal of GPS positioning changes with the speed alterations. When UAV is in tilted flight, the GPS signal will be kept out by the angle of inclination of fuselage, leading to information interruption in the acquisition process, which brings strong shielding interference in the positioning process. The traditional positioning method needs to make ordination analysis of all the positioning information, and requires higher real - time of GPS positioning information. Information collection in tilt tends to be affected by the inclination angle. Also the low rate of positioning will lead to no response of UAV position request. This paper presents a GPS positioning in UAV model based on multidimensional space evolution law. This model can analyze the information during tilted flight, divide the searched targets into multiple fields, and create multiple spaces. Routes in these spaces are selected and evaluated. Then the deep characteristics of the target are extracted. Besides, according to in - depth features, it is searched in the reposi- tory to improve timeliness and accuracy of positioning information under tilted posture. Simulation results show that the proposed method can improve the timeliness and accuracy of positioning.