Steering apparatus for a flying body

Claim 1

A steering system for a flying body, comprising aerodynamic control surfaces (4, 5, 6, 7, 8) operable for steering said flying body, jet engine means for emitting a propulsion jet, jet deflector flap means (11, 12, 13, 14), means mounting said jet deflector flap means in said propulsion jet for deflecting said propulsion jet, flight condition pick-up means for providing flight condition signals, flight control means (18) including attitude controller means (19) having input means connected to said flight condition pick-up means for receiving said flight condition signals, whereby said attitude controller means receive a continuous supply of actual flight information, said jet deflector flap means being arranged for controlling a pitching motion, a yawing motion, and a rolling motion of said flying body by a respective deflection of said propulsion jet, said system further comprising drive means (15) connected to said jet deflector flap means (11, 12, 13, 14), means connecting said drive means (15) to said flight attitude controller means (19) for operating said jet deflector flap means to assist or replace said aerodynamic control surfaces (4, 5, 6, 7, 8) in response to said flight condition signals, wherein said flight condition pick-up means comprise a pressure head measuring device for supplying a pressure head input signal to said flight control means, memory means having stored therein a rated, pressure head dependent control momentum curve providing rated attitude representing control moment values to said flight control means for controlling said jet deflector flap means in such a manner, that the sum of actual control moments provided by said jet deflector flap means (11, 12, 13, 14) and of actual control moments provided by said aerodynamic control surfaces (4, 5, 6, 7, 8) corresponds to said rated, pressure head dependent control momentum curve, whereby said flight attitude controller means (19) ascertains the instantaneously required steering control effectiveness with reference to said rated, pressure head dependent control momentum curve for steering said flying body from its measured actual attitude into a rated attitude determined by said rated, pressure head dependent control momentum curve, and whereby said sum of actual control moments can be supplied by said aerodynamic control surfaces or by said jet deflector flap means or by said aerodynamic control surfaces and said jet deflector flap means to satisfy said rated, pressure head dependent control momentum curve, said system further comprising a closed loop thrust control device (25) connected to said flight control means and to said jet engine for automatically controlling the jet engine thrust in a closed loop manner to increase the steering effect of said jet deflector flap means (11, 12, 13, 14), when the steering effect of said jet deflector flap means becomes insufficient for satisfying said rated, pressure head dependent control momentum curve at all flight speeds.