G - Physics
01
S
G01S 7/38 (2006.01) H04K 3/00 (2006.01)
Patent
CA 2054340
ABSTRACT A shipborne Electric Countermeasures (ECM) system protects ships against an approaching missile by transmitting electromagnetic jamming signals directly at the missile's radar in order to disturb its range and angle tracking system sufficiently to prevent the missile from intercepting the ship. Various jamming techniques are transmitted until one is found that causes an angle deflection or "jog" in the radar transmitting antenna of the missile. The ECM's receiver looks for a sudden drop in the strength of the radar signal transmitted by the missile's radar, which indicates that a "jog" may have occurred, in order to determine if a jamming technique is effective. Multipath disturbances due to forward scattering interference also cause drops in the strength of a received radar signal but these types of signal fluctuations are a height dependent phenomenon. This ECM system differentiates between multipath disturbances and actual "jogs" by using a receiving antenna array with a number of antennas located at different heights. The vertically separated antenna measures drops in signal strength at different times if these drops are caused by multipath disturbances. However, any drops in signal strength caused by a "jog" reach all the antennas at the same time and are measured simultaneously providing an indication that a "jog" has occurred.
Doucet Keith R.
Her Majesty The Queen In Right Of Canada As Represented By The M
Kelly H.a.
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