Gbias for rate based autopilot

A system for shaping a trajectory of a projectile comprising:

• a guidance and control autopilot;
• at least one processor of the guidance and control autopilot executing a program performing as follows:
• processing a roll orientation with respect to gravity and an estimate of a velocity of the projectile;
• determining an Inherent Gbias amount produced by null guidance and control lateral rate control loops of the guidance and control autopilot;
• determining a Desired Gbias amount;
• determining an Additional Gbias amount;
• applying the Additional Gbias to the Inherent Gbias;
• determining a total rate command by the at least one processor of the guidance and control autopilot system, wherein the total rate command is determined by dividing the Desired Gbias by the estimate of the velocity of the projectile;
• and
• guiding the projectile to a target using the total rate command from the guidance and control autopilot.

A guidance and control autopilot device for shaping a trajectory of a projectile comprising:

• a feed forward section;
• a guidance filter;
• pitch/yaw/roll coupled aerodynamics;
• a feed forward section;
• a pitch rate sensor;
• wherein at least one processor determines a total rate command equal to an Additional Gbias divided by an estimate of a velocity of the projectile, combined with guidance loop commands, incorporating a roll orientation with respect to gravity;
• and
• whereby the guidance and control autopilot device is configured to guide the projectile to a target.