Means for improving the detection capabilities of an mti radar

Claim 1

IN A RADAR INDICATOR SYSTEM FOR YIELDING A CYLICALLYREVISED VISUAL PRESENTATION OF THE POSITION OF AT LEAST ONE MOVING TARGET LYING WITHIN A GENERALLY PREDETERMINED REGION IN SPACE, IN WHICH SYSTEM THE DESIRED PRESENTATION OF SUCH MOVING TARGET IS SUBJECT TO DEGRADATION BY THE REFLECTION OF ELECTROMAGNETIC ENERGY FROM AT LEAST ONE STATIONARY OBJECT LYING WITHIN THE SAID PREDETERMINED SPATIAL REGION, THE IMPROVEMENT WHICH COMPRISES: MEANS FOR REDUCING THE EFFECT IN SUCH PRESENTATION OF THE REFLECTIONS FROM SUCH STATIONARY OBJECT BY INHIBITING THE PASSAGE THROUGH SUCH RADAR SYSTEM OF THE ELECTROMAGNETIC ENERGY REPRESENTATIVE THEREOF, SAID MEANS INCLUDING; A DIRECTIVE ANTENNA DESIGNED FOR CYCLIC ROTATION IN A GENERALLY HORIZONTAL PLANE, SAID ANTENNA HAVING A REFLECTOR AND A FIRST FEED HORN ACTING BOTH TO TRANSMIT AND RECEIVE ELECTROMAGNETIC ENERGY; A SECOND FEED HORN FOR SAID ANTENNA, SAID SECOND FEED HORN BEING POSITIONALLY DISPLACED FROM SAID FIRST HORN IN A GENERALLY VERTICAL DIRECTION, SAID SECOND FEED HORN ACTING TO RECEIVE ELECTROMAGNETIC ENERGY TRANSMITTED BY SAID FIRST HORN AND REFLECTED FROM OBJECTS INCLUDING SAID STATIONARY OBJECT; EACH OF SAID FEED HORNS HAVING A PARTICULAR RADIATION PATTERN, THE PATTERN OF SAID SECOND HORN BEING VERTICALLY OFFSET WITH RESPECT TO THE PATTERN OF SAID FIRST HORN SO THAT DIFFERENT SPATIAL REGIONS ARE COVERED THEREBY, SAID STATIONARY OBJECT LYING WITHIN THE RADIATION PATTERN OF SAID SECOND HORN AND FROM WHICH REFLECTIONS ARE RECEIVED BY SAID ANTENNA WHICH TEND TO DEGRADE THE SAID PRESENTATION; MEANS FOR ENERGIZING SAID FIRST HORN; A RADAR RECEIVER TO WHICH THE RESPECTIVE SIGNALS REFLECTED BACK TO BOTH SAID HORNS ARE APPLIED; MEANS FOR GATING THE OUTPUT OF SAID SECOND HORN DURING THOSE TIME INSTANTS WHEN REFLECTIONS FROM A STATIONARY OBJECT LYING WITH IN THE RADIATION PATTERN THEREOF ARE BEING PICKED UP BY SAID ANTENNA, SO THAT NO ENERGY IS APPLIED TO SAID RECEIVER DURING SUCH TIME INSTANTS, WHILE THE ENERGY PICKED UP BY SAID FIRST HORN CONTINUES OT BE APPLIED TO SAID RECEIVER; MEANS FORMING PART OF SAID RECEIVER FOR SEPARATELY PROCESSING THE RESPECTIVE ENERGIES RECEIVED THEREBY FROM EACH OF SAID HORNS; MEANS ALSO FORMING PART OF SAID RECEIVER FOR COMBINING THE SIGNALS THUS SEPARATELY PROCESSED; AND MEANS FOR PRESENTING THE SIGNALS THUS COMBINED.