4 results about "Rolling code" patented technology

A system for providing ticket based authorized entry of a mobile access device includes a memory, a transceiver and a control module. The memory stores an access code of a ticket of an event to be accessed by the mobile access device. The mobile access device also stores the access code. The control module: determines an amount of time since the ticket was purchased or an amount of time since the access code of the ticket was last updated; and updates the access code stored in the memory and signals the mobile access device via the transceiver to update the access code stored at the mobile access device in response to the amount of time since the ticket was purchased exceeding a first predetermined amount of time or the amount of time since the access code of the ticket was last updated exceeding a second predetermined amount of time.

An encrypted rolling code, a plurality of differing data bit order patterns, and a plurality of differing data inversion patterns are provided. One then selects a particular one of each of these patterns and uses those selected patterns as transmission characteristics when transmitting at least part of the encrypted rolling code.

This invention relates to the field of data fusion processing technology, specifically disclosing an ultrasonic water meter anti-theft method based on multi-sensor fusion and multi-level response. This invention achieves comprehensive detection of various water theft behaviors such as magnetic interference, physical damage, and casing deformation through a sensor monitoring network; accurately identifies the type and severity of anomalies through multi-source information fusion and intelligent level judgment; securely protects communication data through encryption authentication and rolling code mechanisms; and implements differentiated handling from record keeping and remote alarm to valve shut-off through a hierarchical linkage response mechanism, effectively improving the comprehensiveness of ultrasonic water meter anti-theft monitoring and the adaptability of response handling.

The application relates to the technical field of wireless communication, in particular to a proprietary airspace unmanned aerial vehicle management and control system and method based on communication link intervention. The method comprises the following steps: capturing an unmanned aerial vehicle radio frequency signal through spectrum sensing, extracting physical layer features such as in-phase quadrature components and entropy values, and constructing a multi-dimensional time sequence vector representing communication state changes; inputting the feature sequence into an LSTM unsupervised protocol syntax inference model, learning inter-frame dependence and state transition, and outputting a dynamic protocol syntax tree; constructing a reinforcement learning action space based on the syntax tree, searching for authentication and encryption verification fragile states by injecting a perturbation probe packet; combining a rolling code to observe and predict subsequent code values and calibrate a timestamp and a check bit, sending a takeover frame in a receiving window period, taking over an original remote control link and establishing a unique control channel; issuing a virtual geographic fence and navigation correction, planning an obstacle avoidance path in combination with a three-dimensional potential field, and guiding the unmanned aerial vehicle to safely land.