Abstract: A quadrotor or other vertical lift aerial vehicle measures an angle of a payload slung from the quadrotor relative to a body of the quadrotor. Using this measurement a signal may be generated that adjusts a flight characteristic of the quadrotor to counteract swing in the payload. A feedback function for generating the feedback signal may include proportional and derivative gain functions as well as non-linear signal processing functions. The feedback signal may be added to normal input control signals to cause acceleration in the direction of the payload angle that damp oscillation of the slung payload caused by wind or movements of the quadrotor.

Abstract: An apparatus includes a body having at least one pitch control system and a mounting system, the mounting system configured to couple to a payload. The apparatus also includes a rocket engine coupled to the body and configured to accelerate the body to a hypersonic speed. The apparatus further includes a control system configured to release the payload while the body moves at the hypersonic speed by commanding the at least one pitch control system to adjust an angle of attack of the body to a negative angle of attack and commanding the mounting system to release the payload while the body is moving at the hypersonic speed and at the negative angle of attack.

Abstract: An apparatus includes a body having at least one pitch control system and a mounting system, the mounting system configured to couple to a payload. The apparatus also includes a rocket engine coupled to the body and configured to accelerate the body to a hypersonic speed. The apparatus further includes a control system configured to release the payload while the body moves at the hypersonic speed by commanding the at least one pitch control system to adjust an angle of attack of the body to a negative angle of attack and commanding the mounting system to release the payload while the body is moving at the hypersonic speed and at the negative angle of attack.

Abstract: A real time reconfigurable, fully integrated, fault tolerant guidance and control system to act in a coordinated fashion to bring a re-entry air vehicle or a UAV to a stop, while keeping it within runway bounds after a high-speed landing.

Abstract: A system and associated method for determining the ground contact status of an air vehicle. The system includes an altitude measurement device; at least one wheel speed sensor; at least one weight-on-wheel sensor; at least one squat switch and a processor for processing useful data from the altitude measurement device, the at least one wheel speed sensor, the at least one weight-on-wheel sensor and the at least one squat switch to manage the status of whether the air vehicle is in contact with the ground based on a ratio of the number of sensors providing useful data to the number of sensors available.

Abstract: Methods and systems for calculating atmospheric vehicle air data are disclosed. In one embodiment, a method of calculating air data includes acquiring one or more pressure measurements at locations on an outer surface of the aircraft; acquiring one or more measurements using an alternate navigation device; computing an indicated air data solution using the one or more measurements obtained using the alternate navigation device and an atmospheric model; computing corrections to the indicated air data solution using one or more other measured parameters, wherein the one or more other measured parameters include at least one of the one or more pressure measurements and the one or more measurements obtained using the alternate navigation device; determining a corrected air data solution using the indicated air data solution and the corrections; and providing the corrected air data solution for use in controlling the aircraft.

Abstract: Methods and systems for calculating atmospheric vehicle air data are disclosed. In one embodiment, a method of calculating air data includes acquiring one or more pressure measurements at locations on an outer surface of the aircraft; acquiring one or more measurements using an alternate navigation device; computing an indicated air data solution using the one or more measurements obtained using the alternate navigation device and an atmospheric model; computing corrections to the indicated air data solution using one or more other measured parameters, wherein the one or more other measured parameters include at least one of the one or more pressure measurements and the one or more measurements obtained using the alternate navigation device; determining a corrected air data solution using the indicated air data solution and the corrections; and providing the corrected air data solution for use in controlling the aircraft.