8 results about "Virtual coordinate systems" patented technology

A host, a tracking system, and a tracking method are described herein. A storage circuit is configured to store a program code. A processor is coupled to the storage circuit and configured to access the program code to execute: aligning a real coordinate system of a real world with a virtual coordinate system of a virtual world; obtaining a detecting status of a real object in the real world through an object sensor; obtaining a reference status in the real world; in response to a touch action to the real object, comparing the detecting status with the reference status; and in response to a status difference between the detecting status and the reference status being greater than a threshold value, calibrating a virtual object coordinate of the virtual object.

A host, a tracking system, and a tracking method are described herein. A storage circuit is configured to store a program code. A processor is coupled to the storage circuit and configured to access the program code to execute: aligning a real coordinate system of a real world with a virtual coordinate system of a virtual world; obtaining a detecting status of a real object in the real world through an object sensor; obtaining a reference status in the real world; in response to a touch action to the real object, comparing the detecting status with the reference status; and in response to a status difference between the detecting status and the reference status being greater than a threshold value, calibrating a virtual object coordinate of the virtual object.

This invention belongs to the field of motor control technology. Specifically, it relates to a method and system for smooth speed switching control of an air conditioning compressor based on coordinate transformation. In the low-speed stage, it accurately constructs the electrical angle based on speed integral limiting. Relying on instantaneous switching via coordinate transformation, it achieves instantaneous mapping from the virtual coordinate system to the actual rotor rotation coordinate system of the motor through angle error constraints. Combined with limiting the range of angle deviation, it avoids angle jumps. Simultaneously, after switching, it rapidly performs speed-current dual closed-loop control, effectively suppressing torque pulsation and current surges at the moment of switching, achieving a smooth, shock-free transition from open-loop start-up to closed-loop operation, and ensuring the stable operation of the air conditioning compressor.

Embodiments of the present disclosure provide an AR-based remote virtual interaction method, comprising: obtaining an interaction position and interaction content between a first user and virtual content presented at a first device, the virtual content comprising a first rendering of a three-dimensional (3D) model defined within a virtual coordinate system, the interaction position being defined within the virtual coordinate system, the interaction content being obtained through a camera on an AR; generating AR content, the AR content comprising: a second rendering of the model based on a position of a second user within the virtual coordinate system, the position of the second user being based on information obtained by a second device, and a virtual representation of the interaction based on the interaction position; and outputting and presenting the AR content at the second device. Corresponding systems, electronic devices and computer-readable storage media are also provided. The AR-based remote virtual interaction method and system can break through the barrier of "seeing different things" between the two parties of remote interaction, and expand the application range of AR interaction.

A landing platform control method, system, medium, and product for an unmanned transport vehicle are disclosed. The method involves acquiring the vehicle's linear acceleration and angular velocity, as well as the relative position and velocity of the unmanned aerial vehicle (UAV), in the vehicle's coordinate system. A dynamic spatial mapping function, eliminating the influence of inertial forces, is constructed to map the UAV's relative position to a virtual pure inertial coordinate system. A descent trajectory is planned in the virtual coordinate system, and the origin tangential vector is extracted. The physical reference normal vector in the vehicle's coordinate system is obtained through inverse mapping. The dynamic sink rate of the UAV is calculated based on the relative velocity, and the attitude compensation angle is determined accordingly. The physical reference normal vector is then deflected to generate the final landing reference vector. The landing platform is driven to move, ensuring that its surface normal is collinear with the final landing reference vector. This application aims to reduce the risk of attitude instability during dynamic landing of UAVs, improve the smoothness and safety of landing while in motion, and thus enhance the overall operational efficiency of the air-ground cooperative transportation system.

This invention discloses an external fixation orthotic mechanism with virtual center motion characteristics, consisting of a moving platform, a stationary platform, three motion chains, and orthotic components. The three motion chains are distributed at 120° intervals along the circumference of the stationary platform, increasing the stability of the mechanism. The motion chains connect the moving platform and the stationary platform by threaded connection. By tightening the locking nut, the chains can be fixed to the stationary and moving platforms, making installation convenient, flexible, stable, and reliable. During orthotic treatment, the moving platform can drive the fixed component to rotate around the X and Y axes of the virtual coordinate system and move along the Z axis, increasing the orthotic flexibility and range, and ensuring that the axis of the orthotic component will not shift during the orthotic process, preventing misalignment. Based on the modular design concept, the external fixation orthotic mechanism of this invention can be used in series with some orthotic devices in clinical practice to achieve a wider range of orthotic functions and better orthotic effects.

The application belongs to the technical field of motor control, and relates to a kind of air conditioner compressor rotating speed smooth switching control method and system based on coordinate transformation, and the electric angle is accurately constructed based on rotating speed integral limiting in low speed stage, and instantaneous switching is relied on coordinate transformation, and the instantaneous mapping of virtual coordinate system to actual motor rotor rotating coordinate system is realized by angle error constraint, and the range limitation of angle deviation is matched to avoid angle jump. At the same time, after switching, the rotating speed-current double closed loop control is quickly carried out, the torque ripple and current impact at switching moment are effectively inhibited, the smooth transition of open loop starting to closed loop operation is realized without impact, and the running stability of air conditioner compressor is guaranteed.

The application discloses a random injection signal extraction method of a permanent magnet synchronous motor based on virtual coordinate transformation and belongs to the technical field of position sensorless control of the permanent magnet synchronous motor. First, a voltage signal generator of a high-frequency pulse signal with randomly selected different pulse sequences is designed and generated, a general expression form of a high-frequency current response in a high-frequency virtual coordinate system is derived, and a high-frequency pulse voltage with different pulse sequences in the d-axis is estimated. Second, the high-frequency current response is demodulated in the high-frequency virtual coordinate axis, and position information and position estimation are extracted. The high-frequency pulse voltage signals with different pulse sequences are superimposed on the direct axis of the estimated two-phase rotating coordinate system, the high-frequency current response containing rotor position information is detected, the response signal is demodulated, the rotor speed and position information are acquired, and the dynamic performance and reliability are improved on the premise of retaining the position sensorless steady-state performance based on the high-frequency signal injection.