Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. Based on the manipulation data, the parameter changing means changes damage of a virtual enemy. To fabricate, at least one electrostrictive layer and many transducers are formed on opposite sides of a wafer that is then cut into rows containing plural transducers. The difference between the actual and desired operating pressure is then processed to control the operation of the automatic choke to thereby controllably bleed pressurized fluidic materials out of the annulus thereby creating back pressure within the borehole. The outer wall extends into the tapered section where the tapered section contacts the inner wall and closes the outer chamber. In one embodiment, an on-board avionics airspeed estimation system is provided.