Implementation of a trajectory shaping scheme for ideal missile impact conditions

Current problems concerning helicopter-launched anti-tank missiles are related to the deflection of the incoming warhead charge by the armor geometry in the case of a line-of-sight trajectory. A number of schemes conceived to solve this problem make use of bias-shaping approaches or complex trajectory designs. None of these schemes is satisfactory. A description is presented of a new procedure, the Multimode Guidance (MMG) scheme, which appears to provide the required solution. MMG will be implemented in microprocessor-based digital autopilots which are now under engineering development, and currently available in U.S. Army Missile Command testbed prototype R and D missiles. MMG consists of a Climb-and-Cruise Phase, a bang-bang Dive Phase, and a standard terminal homing Proportional Navigation Guidance phase. A low altitude flight and high impact angles with low angles of attack are provided.