theta]]: The Proportional Navigation coefficient in the "OXY" plane [K.
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Target maneuvering and missile velocity changes will change the seeker look angle required to fly the proportional navigation
For long ranges the M-T and M-D lines of sight are practically coincident and the new navigation law then reduces to the above expression for proportional navigation in the presence of one target.
which generalizes the familiar proportional navigation law in the presence of one target; C is the missile Navigation Constant.