DESCRIPTION
FMCW RAM is based on the state if the art technology using FMCW technique to measure the height of our Aircraft. The systems addresses issues like number of detections to declare the presence of beat signal during search mode, initial sweep period to cover the total altitude range, range of beat frequencies generated, maximum Doppler shift due to altitude rate, maximum spectral spread due to wide antenna beam width, receiver resolution issues, sweeps required to acquire FFT frame data, etc are addressed.
Mathematical treatment of the nature of beat signal during different modes of flight of an aircraft e.g. level flight, banking and ascent /descent are discussed. The simulation aspects of the beat signal considering the effects of finite antenna beam width and aircraft altitude rate are presented.
The Digital Signal Processing (DSP) algorithm for altitude processing has been outlined with the help of a block diagram. The processing required during search, search to track and track modes is discussed.
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