A TERRAIN-AIDED NAVIGATION APPARATUS USING A RADAR ALTIMETER BASED ON THE MODIFIED ELEVATION MODEL

摘要

The present invention relates to terrain referencing navigation technology, especially to a terrain referencing navigation apparatus based on a modified elevation model, which uses a radio-altimeter mounted on a flight vehicle to autonomously detect the location of the flight vehicle without external help and measures the location of the flight vehicle. The terrain referencing navigation apparatus includes an elevation model generating unit that generates the modified elevation model by reflecting the beam-width of the mounted radio-altimeter to digital elevation model data embedded in the flight vehicle in each pixel corresponding to all the radio-altimeter measurement points along a flight path; a data processing unit that extracts elevation data from the waveform of a reflected wave signal that is reflected from the surface of the earth; and a navigation unit that determines the flight path of the flight vehicle by comparing the elevation data that is extracted by the data processing unit with the modified elevation model that is extracted by the elevation model generating unit. [Reference numerals] (100) High frequency module; (140a,140b) High frequency processing unit; (200) Signal processing module; (210) Elevation model generating unit; (220) Data processing unit; (230) Navigation unit; (AA) Tx control/Rx control