Elevation-based terrain detection algorithm

Abstract

The invention discloses an elevation-based terrain detection algorithm, and the algorithm comprises the following steps: S1, transmitting a radar ray from a transmitting point after inputting the coordinate parameters of a target point, and carrying out coordinate processing on an area between the target point and the transmitting point, so as to obtain the elevation data of points on the ray; s2, projecting points on the ray to the terrain to obtain terrain point data corresponding to the ray points, so as to obtain the height of each ray point and the height information of the terrain points; s3, traversing the radar ray point height and the terrain point height of the output coordinate point and the target coordinate point in sequence, and then, judging whether the terrain point height is higher than the radar ray point height or not; s4, if the current terrain point is higher than the ray point, indicating that a shielding object exists between the radar and the target object, and at the moment, storing elevation data of the terrain point; and if the current terrain point is lower than the ray point, skipping the current terrain point.

Description

technical field [0001] The invention relates to a terrain detection algorithm, in particular to an elevation-based terrain detection algorithm. Background technique [0002] Digital Elevation Model (DEM, Digilal Elevation Model) is a spatial data model that describes surface relief features (regional geomorphology), and is represented by DEM unit grids. The DEM unit grid is described by a matrix composed of DEM data, and the DEM data includes plane coordinate (X, Y) data and elevation (Z) data. [0003] Radar can detect target objects by transmitting and receiving radio waves, for example, detecting the distance, azimuth, height, speed, shape and target type of the target object. When implementing detection, the radar detects by transmitting a radar beam and receiving the echo signal of the target object on the radar beam. In the echo signal, in addition to the echo signal (radio wave) reflected by the target object, part of the radar beam will also touch the ground during...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the existing filtering algorithm is not perfect, and the non-ground points cannot be completely separated. These residual non-ground points show the characteristics of gross errors in the local terrain area, and the existence of gross errors will seriously distort the digital elevation model. It greatly affects the accuracy of the generated digital elevation model and makes it difficult for the operator to judge whether there is an obstacle between the radar and the target point. The purpose is to provide an elevation-based terrain detection algorithm to solve the above problems

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