초록 ▼

An adaptive detection threshold system for moving target detector and moving target indicator radar systems. The threshold system uses data from the echo input signal to reconstruct a threshold level closely resembling the output clutter residue in doppler filters due to point clutter sources. At le

An adaptive detection threshold system for moving target detector and moving target indicator radar systems. The threshold system uses data from the echo input signal to reconstruct a threshold level closely resembling the output clutter residue in doppler filters due to point clutter sources. At least three azimuth data values are used, with the values being from adjacent coherent processing intervals and separated in azimuth a distance approximately equal to the beamwidth of the antenna system. The data at the same range from the three azimuths is combined to form an estimate of the residue at the output of a doppler filter, assuming that the echo is caused by point clutter. Compensation for radar instability and changes in scan rate or interpulse period is included. Data from conventional constant false alarm rate processing designed to control alarms from distributed interference, such as weather echoes, is also used to compensate the residue estimate.

대표청구항 ▼

An adaptive detection threshold system for a radar having a scanning antenna system, said threshold system comprising: means for obtaining data corresponding to the amplitude of clutter signals received by the radar for different azimuths of the radar antenna; means for selecting at least first, sec

An adaptive detection threshold system for a radar having a scanning antenna system, said threshold system comprising: means for obtaining data corresponding to the amplitude of clutter signals received by the radar for different azimuths of the radar antenna; means for selecting at least first, second and third values of said data, with said first value being representative of the clutter amplitude received by the radar when its antenna is positioned in a first direction, said second value being representative of the clutter amplitude received by the radar when its antenna is positioned in a second direction, and said third value being representative of the clutter amplitude received by the radar when its antenna is positioned in a third direction, said second direction being located angularly between said first and third directions; means for combining said first, second and third values; means for controlling the detection threshold level for signals received when the radar antenna is in said second direction, with the controlling means being dependent upon a combined value derived from combining said first, second and third values; and means for inhibiting detection when more than one of said first, second and third values exceeds a predetermined saturation limit.