Method for calculating approximate position information in mountain environment

The invention discloses a method for calculating approximate position information in a mountain environment. The method comprises the following steps: when an RNSS positioning signal fails, calculating lost satellite information, calculating projection of a mountain according to the position of the lost satellite and topographic data, superposing the projection of the mountain, obtaining a shadow surface, and calculating the position of a terminal. The terminal position is obtained by calculating the data of the terrain and mountain projection, the positioning problem of a non-signal area is solved, the positioning problem when satellite positioning information cannot be received in areas such as mountainous regions and canyons can be solved, auxiliary positioning is provided for operation in the mountainous environment, and the operation safety is improved. 本发明公开了一种山地环境下概略位置信息的推算方法，本发明在RNSS定位信号失效时，计算丢失的卫星信息，再根据丢失卫星的位置和地形数据，计算山体的投影，对山体投影进行叠加，得到阴影面，推算终端位置，本发明通过计算地形和山体投影的数据得到终端位置，解决了无信号区域定位问题，使本发明能够解决在山地、峡谷等区域，