Compensation method for data packet loss in network control system based on compressed sensing

Abstract

The invention discloses a data packet loss processing method based on compressed sensing. The method comprises the following steps of: firstly, aiming at a single-output network control system, constructing a basic expression by using sparse representation of compressed sensing, adding a regular term in a target function through feedback correction to avoid accumulation of predicted value errors, and obtaining predicted values of multiple moments in the future; secondly, for a multi-output network control system, on the basis of the time relation and the space relation of multiple sensors, establishing sparse representation of a whole sliding window, considering multiple situations that data packets are lost when the multiple sensors transmit information through channel multiplexing, obtaining compensation values of the lost sensors by using different objective functions, and then considering the problem of limited medium access during channel multiplexing, and on the basis of ensuring that the whole system is controllable and observable, obtaining a communication sequence for static scheduling, thereby compensating the information of the sensors which cannot be accurately transmitted.

Description

technical field [0001] The patent of the present invention relates to the field of automation technology, in particular to a compensation method for data packet loss in a network control system based on compressed sensing. Background technique [0002] With the rapid development and mutual integration of network communication, control science and computer technology, the structure of the control system becomes more and more complex and the scale becomes larger and larger, and the network control system also emerges as the times require. However, due to the influence of communication protocols and network mechanisms, when controllers, sensors and actuators exchange data through the network, network congestion and data collisions often occur, which makes network-induced delays and data Problems such as packet timing disorder and data packet loss. The emergence of these problems makes many properties of traditional control, such as synchronization and no delay, no longer valid...

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Problems solved by technology

However, as a control algorithm, this algorithm is only suitable for the packet loss between the controller and the actuator, and it cannot handle the packet loss between the sensor and the controller, which is its main disadvantage; while , for complex time-varying processes, even if the model of the algorithm can be updated at each sampling moment, it will take up more computing resources; in addition, when using this algorithm to solve the problem of packet loss, it is necessary to calculate the number of consecutive packet loss constrained, which is also the shortcoming of the algorithm

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