An MTD digital processor for surveillance radar with a bank of Doppler filters and system of thresholds both selectable and dependent on the interference

摘要

Digital processor for surveillance radar, in particular for air traffic control, constitude by a set of transverse fitters which cover the unambiguous Doppler frequency interval with Doppler frequency response selectable for each filter in order to adapt the filtering to the interference characteristics produced by unwanted echoes (clutter). At the output of the filters there is the extraction of the modulus and the comparison with the detection threshold, possibly adaptive. The result is sent to the overall detection logic.;The selectable filtering and the selectability between the fixed and adaptive threshold allow the limitations of fixed filtering to be overcome by optimizing the capability of detecting targets in various types of interference.