7 results about "Tracking error" patented technology

In the optical pickup device, while reflection light reflected from the optical multi-layer disc is divided into a plurality of regions so as to produce a plurality of divided optical beams, the divided optical beams are focused onto different positions on a photodetector, and a focus error signal is detected by employing a plurality of the divided optical beams by utilizing the knife edge method, and further, a tracking error signal is detected by employing a plurality of the divided optical beams. Furthermore, the dividing regions of the optical beam and light receiving parts are arranged in such a manner that stray light derived from other layers of the optical disc is not entered to a servo signal-purpose light receiving part of the photodetector when the divided optical beam is focused onto a target layer of the optical disc.

The invention discloses a game theory-based MIMO channel tracking method, which comprises the following steps: transmitting a pilot signal, performing channel estimation through the pilot signal and taking a channel estimation value as an initial value of tracking; modeling MIMO channel noise serving as a game opponent; resolving a tracking error and determining a tracking target function; and solving saddle points of the target function through the game theory to realize channel tracking. The method combines the game theory and the MIMO channel tracking method, thereby having high tracking accuracy.

The invention discloses a control method for the fault tolerance tracking of the adaptive neural network of a rigid aircraft. The method designs a fixed time sliding surface for the posture tracking problem of the rigid aircraft with a concentration uncertainty to ensure that the fixed time of the state shortens, introduces a function in which the neural network approximates the total uncertainty,and designs an adaptive fixed time controller. According to the control method for the fault tolerance tracking of the adaptive neural network of the rigid aircraft, the control that the fixed time of the posture tracking error and the angular velocity error of the aircraft system are consistent and bounded is realized, under the factors of external disturbance, uncertain moment of inertia, actuator saturation and failure.

The invention provides a dual-sliding mode control based speed regulating system and method for direct torque of a permanent magnet synchronous motor main axis. The speed regulating method comprises the following steps: calculating the torque of the motor main axis according to the difference value of the actual rotating speed of the permanent magnet synchronous motor main axis and the given rotating speed of the permanent magnet synchronous motor main axis as a given value of a PI regulator; detecting the stator current and voltage of the motor main axis by using a sensor, observing the fluxlinkage and torque of the motor main axis under a stator coordinate system, comparing observed values with the torque calculated by the PI regulator and the given flux linkage respectively, obtainingdirect axis voltage and quadrature axis stator voltage by using the difference value through a dual-sliding mode controller, acting on a power switch device on a main circuit inverter through coordinate conversion and SVPWM conversion, and thus realizing direct torque control of the permanent magnet synchronous motor main axis. The speed regulating system is simple in structure, easy to realize and good in robustness, and has the advantages of high torque response speed and small tracking error, so that the stability of the system and the machining precision of parts are improved.

The invention discloses a secondary optimization control method for the firing process of a rotary cement kiln. A process model is established by collecting input and output data; a process state change and an output tracking error are combined to form a new process state quantity and thus a new process model is established; and then a controller is designed by using a quadratic objective functionand an optimal update law is designed. According to the invention, the state change and output tracking error are introduced into the process and thus the adjustment of the controller becomes flexible, so that the fault tolerance of the system is improved; and the influence of partial actuator failures is reduced.

The invention discloses a historical video real-time linear tracking method, which relates to the field of video image processing, and comprises the following steps of: 1, carrying out initializing and loading a library; step 2, carrying out linear tracking processing on historical videos; 3, releasing resources and unloading a library; step 4, ending. In the step 2, human factors are introduced,single-frame rapid playing is carried out on the video according to needs, target object extraction is carried out, a corresponding mark is marked at the position where the target appears, and when the target turns or suddenly changes, tracking is carried out through moving the target mark at the turning point again. Through the implementation of the invention, the precision of the target trackingalgorithm in a complex scene is improved, the problem of target tracking errors or target tracking missing in a complex picture can be solved, the method is not influenced by error timestamp information, and the method is simple and easy to popularize and apply.