Missile proportional navigation system using fixed seeker

Claim 1

A missile guidance system for proportional homing navigation on a target, comprising: a fixed seeker array having an output, for providing a quantized output signal in accordance with the position of a target image on said array; means connected to said output for deriving a control signal related to rate-of-change of said output signal, and missile control means connected to said means for deriving; wherein said means for deriving includes a first summer having inputs and an output; a first sample-and-hold circuit connected between said output of said array and said input of said summer; a second sample-and-hold circuit having an output, and an input connected to the output of said first summer; a one sample time delay circuit having an output, and an input connected to the output of said second sample-and-hold circuit; a second summer having an output, and having inputs respectively connected to the output of said delay circuit and said output of said second sample-and-hold circuit; a third summer having an output and inputs; an amplifier connected between said output of said second summer and an input of said third summer; a third sample-and-hold circuit having an input connected to the output of said third summer and having an output; a fourth summer having an output, and inputs, with one of said inputs connected to said output of said third sample-andhold circuit; said output of said third sample-and-hold circuit being connected to another input of said third summer; and said missile control means including an airframe controller having an input connected to the output of said fourth summer; said means for deriving further iNcluding means for determining missile attitude having an output connected to an input of each of said first and fourth summers.