Forward-looking prediction alarm implementation method of enhanced ground proximity alarm system

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Forward-looking prediction alarm implementation method of enhanced ground proximity alarm system

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ZHAO XIAOQING / WANG JIAN / ZHANG KAN

The invention provides a foresight prediction alarm implementation method of an enhanced ground proximity alarm system, which comprises the following steps of: firstly, establishing a foresight prediction alarm envelope, and providing a topographic data block in a digital topographic database according to the foresight prediction alarm envelope and the current position of an airplane; the digital terrain database is stored in a layered mode, when the digital terrain database is divided into 13 layers, the terrain database is divided into 213 terrain data sub-blocks, and each terrain data block comprises a certain number of terrain data sub-blocks. And judging whether each topographic data sub-block is in the foresight prediction alarm envelope line or not, and storing the topographic data sub-blocks in the foresight prediction alarm envelope line. Each topographic data sub-block comprises 256 grids, and judging whether the grid elevation data in the stored topographic data sub-block is greater than the height corresponding to the foresight prediction alarm envelope line or not. The method has the beneficial effects that the method can meet the requirements of airplanes with different characteristics and different foresight prediction alarm envelope lines, and has wide applicability.

本发明提供一种增强型近地告警系统的前视预测告警实现方法，先建立前视预测告警包络线，根据前视预测告警包络线以及飞机当前位置在数字地形数据库中提供地形数据块。数字地形数据库按照分层的方式存储，当数字地形数据库分为13层级时，地形数据库被划分为213个地形数据子块，其中地形数据块中包含一定数量的地形数据子块。判断每个地形数据子块是否处于前视预测告警包络线内，并将处于前视预测告警包络线内的地形数据子块保存。每个地形数据子块中包含256个网格，判断已保存的地形数据子块中的网格高程数据是否大于前视预测告警包络线对应的高度。本发明的有益效果：可满足于不同特性的飞机、不同前视预测告警包络线，具有广泛适用性。