Resources Contact Us Home
Method and apparatuses for controlling high wing loaded parafoils

Image Number 11 for United States Patent #8131405.

An adaptive guidance system (AGS) regulates the altitude and heading of a parasail to arrive at a target at a prescribed altitude. Since the altitude profile depends both on unknown wing loading, and wind magnitude and direction, the AGS estimates the glide slope and wind on the fly and provides a command to a stability augmentation system (SAS) that results in the desired glide slope and heading by performing a sequence of maneuvers and sensing the response. According to one embodiment, the SAS operates in the linear region and includes a PID controller that uses the difference between the actual heading and heading command to create an actuator output. The actuator output is limited by a position/rate limiter that imposes the physical limitations of the response time of the actuator/servos and position limits to prevent entering the nonlinear region. Alternatively, an adaptive SAS operates in both the linear and nonlinear region and includes a neural network (NN) that receives an error signal (difference between a reference model and actual heading) which is used to adapt the weights of the NN.

  Recently Added Patents
Clock face
Method of manufacturing semiconductor device and semiconductor device
Rupture resistant system
Elastic wave device having a capacitive electrode on the piezoelectric substrate
Conductor-mixed active electrode material, electrode structure, rechargeable battery, and manufacturing method of conductor-mixed active electrode material
Image forming apparatus having a primary transfer unit, a secondary transfer unit, and a direct transfer unit
Display window with level of service graphical user interface
  Randomly Featured Patents
Methods and systems for a portable, interactive display device for use with a computer
Vibration device for silos for bulk materials
Straight edge apparatus for laying ceramic tile
Bias circuit with non-linear temperature characteristics
Feeder system
Flicker detection device, flicker elimination device, image pickup device, and flicker detection method
Environmentally protected camera with an interchangeable drawing type finder
Ink jet printhead
Multi-axis machining head
Interference filter and lightning conductor device