Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-06-16
1978-10-24
Moskowitz, Nelson
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5DP, G01S 730
Patent
active
041224507
ABSTRACT:
An automatic clutter detecting and mapping system in which the area being mapped is broken up into clutter mapping quantum areas with corresponding storage cells including reject codes for automatically rejecting clutter returns which may occur in intermittent or fading clutter occurring a small percentage of the time for example. For each clutter mapping cell a clutter count and a reject code are stored in a main memory and in a first mode which is searching for clutter the clutter count is incremented by eight in response to an input targert but is not decremented in the absence of a received target from that clutter mapping area. In any clutter mapping cell when the clutter count reaches a threshold within a selected number of scan periods, the reject code is set to the amplitude corresponding to the maximum amplitude target report received in that cell and provided by a temporary memory. At this time, the clutter count is set to the midrange of its threshold value and the operation goes into a second mode which is searching for changes in the amplitude of the clutter. In the second mode of operation the counter bits for each mapping cell are incremented and decremented by selected values as a function of the target amplitude, with the reject code being set to a new target amplitude value of the report when a threshold is reached and the counter is again set to mid range. If the counter value reaches zero and the clutter has faded, the reject bits are set to zero and the operation is returned to the first mode.
REFERENCES:
patent: 3325806 (1967-06-01), Wilmot et al.
patent: 3720942 (1973-03-01), Wilmot et al.
patent: 3727215 (1973-04-01), Wilmot
Kowalski Francis W.
Wilmot Richard D.
Adam W. J.
Berger Richard E.
Hughes Aircraft Company
Mac Allister W. H.
Moskowitz Nelson
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