31 results about "Delay dependent" patented technology

The invention belongs to the technical field of power systems and relates to an improved discrimination method of Lyapunov robust stability of a power system containing uncertain delay links, which ischaracterized by solving the Lyapunov functional of a delay system based on the Krasovskii theory, then expressing the derived function of a system trajectory from the functional by a group of linearmatrix inequalities (LMI), reducing the conservation of the criterion by introducing a few necessary loose terms in the process of deducing functional derivatives and then transforming the disturbance terms containing uncertainties by utilizing the Schur complement, thereby obtaining the stability criterion. The method of the invention has the advantages of less conservation and high operation efficiency.

A data distribution management device (10) is provided on a transmission route between a transmission device (C1) that requires a delivery acknowledgement corresponding to data transmitted and a receiving device (C2) in which a transmission delay in a circuit (2) is smaller than a transmission delay in a circuit (3), and comprises a transfer unit that transfers the data from the transmission device (C1) to the receiving device (C2), a returning unit that prepares a delivery acknowledgement corresponding to the data transferred and send the delivery acknowledgement to the transmission device. The data distribution management device (10) also comprises a SG distribution control section (16) that decides whether the data transmitted by the transmission device (C1) is a protocol dependent on transmission delays and that orchestrates the returning unit to prepare a delivery acknowledgement and send the delivery acknowledgement when it is decided that the data is the delay dependent protocol.

The invention relates to an integrated temperature sensor (1) comprising: means (2000) for generating a pulse train (DATA_IN) at an oscillation frequency, means (3000) for counting the number of pulses during a fixed period of time independent of a temperature to be measured (T) and for generating a plurality of bits (b11, b10, . . . , b0) indicating the number of pulses in the pulse train (DATA_IN), and means (4000) for generating a serial digital signal (DATA_OUT) from said bits (b11, b10, . . . , b0), in which the means (2000) for generating a pulse train (DATA_IN) include a plurality of logic gates (2410, 2420, 2430, 2440, 2450) which can introduce a delay dependent on the temperature to be measured (T), said means (2000) generating a pulse train (DATA_IN) the oscillation frequency of which is dependent on said temperature to be measured (T). The invention also relates to a temperature measurement method and to a transponder for a wireless system.

A connection verification system that provides substantially non-intrusive connection verification for an optical switch, achieved by correlating the low-frequency contents of the input and switched signals. The results of the correlation process are compared against a connection map to determine whether the switch has operated correctly and to identify, if possible, which mis-connections have taken place. The system includes a selection unit for controllably admitting individual ones of the input signals and individual ones of the switched signals and a verification unit connected to the selection unit, for controlling operation of the selection unit as a function of a connection map and performing relative-delay-dependent signal processing operations on the signals admitted by the selection unit so as to identify connections established through the switching unit and determine their consistency with the connection map. The relative-delay-dependent signal processing operations may be based on correlation or anti-correlation, depending on the operational requirements of the invention.

The invention discloses a method for measuring delay of a direct sequence spread spectrum binary phase shift keying modulator. Data despreading and demodulation and delay dependence are taken as cores, the delay measurement of input / output signals with different frequencies and different waveforms of the direct sequence spread spectrum binary phase shift keying modulator is converted into the delay measurement of signals with the same frequency and the same waveform, and is implemented by a created system. Digital signals are divided into two paths by a baseband signal generator (1) through apower divider (2), one path of digital signals pass through a direct sequence spread spectrum binary phase shift keying modulator (3) to be tested and enter a high-speed data acquisition unit (4), and the other path of digital signals are directly output by the power divider (2) to the high-speed data acquisition unit (4). A demodulation module (5) and a dispreading module (6) respectively perform demodulation and despreading processing on the acquired signals, and a delay-dependent module (7) calculates the delay of the two paths of signals. The method ensures that additional delay caused byhardware is not introduced in the measuring process, and can ensure the delay measuring accuracy less than 500ps when the sampling rate is 4GSa / s.

The invention belongs to the technical field of power systems and relates to an improved discrimination method of Lyapunov robust stability of a power system containing uncertain delay links, which is characterized by solving the Lyapunov functional of a delay system based on the Krasovskii theory, then expressing the derived function of a system trajectory from the functional by a group of linear matrix inequalities (LMI), reducing the conservation of the criterion by introducing a few necessary loose terms in the process of deducing functional derivatives and then transforming the disturbance terms containing uncertainties by utilizing the Schur complement, thereby obtaining the stability criterion. The method of the invention has the advantages of less conservation and high operation efficiency.

The invention relates to a flexible spacecraft multi-domain dependent robust fault-tolerant control method based on input time-varying delay, comprising the following steps: first, taking flexible vibration as external disturbance, and establishing a flexible spacecraft state space model containing external disturbance and input delay through deduction by use of a Lagrange method; then, establishing a fault model, integrating the fault model into a flexible spacecraft state model needing fault tolerance, and converting an actuator partial failure fault-tolerant control problem into an uncertain parameter robust control problem according to the fault model; and finally, designing a state feedback passive fault-tolerant controller based on a linear matrix inequality approach by combining delay-dependent Liapunov functional and uncertain parameter robust H-infinity control. The method has the advantages of simple design and easy implementation, is applicable to fault-tolerant control under the condition that a flexible spacecraft has both input delay and actuator partial failure in the field of aerospace, and can keep a system asymptotically stable and suppress external interference.

The invention discloses a delay-dependent space-time code mode blind identification method based on characteristic quantity pre-estimation. The method comprises the steps that (1) a space-time code set is extracted to acquire a characteristic quantity set; (2) a parallel matrix and characteristic quantity function value vector quantities are calculated; (3) characteristic quantities are pre-estimated according to the characteristic quantity function value vector quantities to acquire a new space-time code set and a noise power estimation value; (4) the parallel matrix is whitened to acquire a solution correlation matrix; (5) the time-delay correlation norm of the solution correlation matrix is calculated; (6) a time-delay correlation matrix of code patterns in the new space-time code set is calculated; (7) time-delay relevance vector quantities are calculated according to parameters in the fifth step and the sixth step; (8) a code pattern corresponding to an element with the minimum value in the time-delay relevance vector quantities is chosen as a judgment code pattern. The delay-dependent space-time code mode blind identification method based on characteristic quantity pre-estimation overcomes the defect that the complexity of a system in the prior art is high due to the large calculation, widens the identification range of an existing space-time code blind identification method, and can be used for a space-time code pattern used at a blind identification sending end.

The invention relates to a delay-dependent robust constraint predictive control method for an uncertain system with unknown disturbances. The method comprises the following steps: 1, establishing a state space model with an uncertain time-delay system; 2, transforming a constructed model into an expanded time-delay uncertain state space model; 3, designing a controller based on the above expandedmodel; and 4, solving the controller gain by using linear matrix inequality. The method has the advantages that the controller is designed by using the expanded time-delay uncertain state space modelso as to adjust the system state and output errors independently under the condition that a time lag exists, thereby providing more freedom of adjustment; the controller gain of the system is solved by using a new, less conservative and relatively simple expanded model based on a LMI-form delay-dependent stability condition so as to reduce the controller's conservativeness; the H-infinity performance index is introduced into the controller design to overcome any bounded interference and reduce control cost.

The invention belongs to the technical field of power systems and relates to an improved discrimination method of Lyapunov robust stability of a power system containing uncertain double-delay links, which is characterized by solving the Lyapunov functional of a double-delay system based on the Krasovskii theory, then expressing the derived function of a system trajectory from the functional by a group of linear matrix inequalities (LMI), reducing the conservation of the criterion by introducing a few necessary loose terms in the process of deducing functional derivatives and then transformingthe disturbance terms containing uncertainties by utilizing the Schur complement, thereby obtaining the stability criterion. The method of the invention has the advantages of less conservation and high operation efficiency.

The present invention discloses a partial delay dependent disordering controller and an establishment method thereof. The partial delay dependent disordering controller includes a controller on the basis of a new operation mode (NOMs) and a controller on the basis of a non-fragile method. The controller on the basis of the new operation mode (NOMs) has an expression as follows: u(k)=K1-bar(r<k>)x(k)+K2-bar(r<k>)x(k-d), wherein, K1-bar(r<k>) is a controller grain, K2-bar(r<k>) is a system state, and the time delay d>=0. The controller on the basis of the non-fragile method has an expression as follows: u(k)=(K1-bar(r<k>)+DeltaK1-bar(r<k>))x(k)+(K2-bar(r<k>)+DeltaK2-bar(r<k>))x(k-d), wherein, K1-bar(r<k>) is a controller grain, x(k) is a system state, time delay d>=0, and DeltaK1-bar(r<k>) and DeltaK2-bar(r<k>) are controller grain disturbances.

The invention discloses a method for judging the stability of an uncertain networked multi-time-delay system, which establishes a closed-loop networked multi-time-delay control system model, and maps the uncertainty of the closed-loop networked multi-time-delay control system into a convex polyhedron parameter space to obtain Convex polyhedral uncertain networked multi-delay control system model; based on the constructed Lyapunov function, use the free weight matrix method to judge the delay-dependent robust stability of the convex polyhedral uncertain networked multi-delay control system, and obtain the delay correlation Sufficient conditions for robust stability. The invention avoids using the same Lyapunov function for all vertices of the convex polyhedron in the uncertain space, and reduces the conservatism of the sufficient condition for robust stability.