72 results about "Signal-flow graph" patented technology

The invention discloses a video human body interaction motion identification method based on an optical flow graph depth learning model. The method mainly comprises steps that step 1, deframing of a test set video and a training set video is carried out, an optical flow sequence graph is calculated through utilizing two adjacent frames; step 2, the optical flow sequence graph is pre-processed, and optical flow graphs with relatively few information quantity are deleted; step 3, a residual error neural network is trained through utilizing the training set optical flow sequence acquired in the step 2, the test set and training set optical flow graph sequences are taken as input, and spatial domain characteristics are acquired; step 4, a long and short memory model is trained through utilizing training set characteristics, test set characteristics are inputted to acquire each type of probability output; and step 5, a classification result is acquired through employing voting model statistics. The method is advantaged in that relevant patent blanks are filled through utilizing the depth learning model to carry out human body motion identification, identification accuracy is high, and the method is applicable to multiple occasions.

The error of a measurement system can be corrected even if the frequency of an input signal of a device under test is different from that of the output signal. A signal output acquiring section acquires the power of the input signal by means of a power meter not shown in the drawing. Thus, errors due to frequency tracking can be separated depending on the direction in a signal flow graph. Since a receiver measures the parameter concerning the received signal when a signal source is directly connected to receiving means, the measurement system error factor of the receiving means can be acquired. The parameter of a device under test can be measured while the error is corrected when the results of measurement, concerning the device under test of receivers are combined.

The invention relates to a reliability analysis method for an embedded safety-critical system, and belongs to the technical field of information safety. The method comprises the following steps of: constructing a software and hardware fault representation set; classifying faults in the fault representation set to acquire a software and hardware fault mode set and constructing a subsequent fault mode set by combining a fault-associated probability table; constructing a static fault tree associated with a software and hardware fault on the basis of the subsequent fault mode set; and analyzing the static fault tree to acquire a fault analysis result. In the method, software and hardware basic units of the embedded safety-critical system are subdivided, a subsequent fault mode is constructed through a fuzzy probability multi-signal flow graph model by combining association of faults of each basic unit, a static fault tree model is constructed by using time sequence logic relation between the faults reflected by the subsequent fault mode set, and the reliability of the system can be more accurately and effectively evaluated by using the model.

The invention discloses a relevance model based infrared earth sensor measuring point optimal configuration method. Firstly, an association graph of an infrared earth sensor's function modules is built. Then, aiming at various kinds of faults happened during on-orbit and test stages of the infrared earth sensor, its fault pattern set is determined. Based on the association graph of each function module, a multi-signal flow graph of the infrared earth sensor is acquired. Based on the multi-signal flow graph, a fault and state information incidence matrix of the infrared earth sensor is established. And based on the established fault and state information incidence matrix, an optimal measuring point set which endows all the faults with detectability and an optimal measuring point set which makes all the faults separable are acquired. According to the invention, based on the case that it is ensured that resource constraint is satisfied, many faults are detected and separated, and a basis for diagnosable design of a satellite control system is provided.

The invention discloses an error analysis method for measuring a high-power microwave phase position through a directional coupler. The method includes the first step of obtaining a relational expression between a measured phase position and an actual phase position through analysis of a simplified signal flow diagram according to the microwave transmission line theory, the second step of carrying out analytical calculation by means of programming according to the relational expression obtained in the first step to obtain a quantized phase error, and the third step of carrying out optimization on a hardware system through the direction of error analysis so as to reduce the error to the maximum degree. Through the method, the phase measurement error of a high-power microwave system of a TOKMAK device is analyzed to obtain factors influencing the phase measurement error; on the basis of analysis of the simplified signal flow diagram, the expression of the high-power microwave phase measurement error is obtained, the measurement error is analyzed through a calculation program according to the relational expression, and finally the relation between the phase measurement error and a directivity factor and the relation between the electrical length and a reflection coefficient are obtained.

The invention discloses a method for calculating cable interference in an infinite shielding layer with holes in a point source radiation field, is applied to the field of electromagnetic interference, and has the advantages of simple algorithm, accurate result, high efficiency and the like. In that method, the aisle of the voltage wave on the cable and the propagation aisle of the space electromagnetic field are represented by signal pipelines, the position with the energy reflection is represented by nodes, a signal flow graph reflecting the electromagnetic energy flow of the system is established, the propagation equation of the whole system signal pipeline and the scattering equation on all the nodes are established by using the magnetic flow element radiation instead of the small holetransmission, the extended BLT (Baum-Liu-Tesche) equation of the system electromagnetic interference is obtained, and the interference intensity on the cable is obtained by solving the extended BLT equation. The method realizes the accurate calculation of the electromagnetic interference of the point source radiation field in the infinite shielding layer with holes and is coupled to the transmission line, and the method effectively reduces the dependence on the computing resources and improves the efficiency.

The invention relates to a system for monitoring a technical device, in particular a drive apparatus, which system has a capturing means, in particular an image storage means, for reading in a first visual representation, in particular a signal flow diagram, wherein the first visual representation contains information regarding at least one setting parameter and/or at least one measurement parameter of a controller, which is designed to control the device. Furthermore, the at least one setting parameter and/or the at least one measurement parameter is suitable for characterizing a state of thedevice. The system preferably also has a scanning means for detecting at least one symbol, in particular lettering, in the visual representation, in particular by means of optical character recognition. Furthermore, the system preferably has a database for associating at least one setting parameter and/or at least one measurement parameter with the at least one detected symbol. An interface to the controller preferably exists in the system in order to capture a value of the at least one setting parameter and/or of the at least one measurement parameter of the controller. Furthermore, the system preferably has an image generation means for generating a second visual representation, wherein the image generation means is coupled to the controller preferably in such a way that information ofat least one setting parameter and/or of the at least one measurement parameter is displayed with at least part of the first visual representation. Finally, the system preferably has an image displaymeans, in particular a screen, for presenting the generated second visual representation for the monitoring of the technical device.

The noise figure for a radio frequency device may be obtained through power measurements. A signal flow graph based upon the S-parameter information of the entire RF system may be constructed. The S-parameter information may be representative of the microwave termination, the device, the measurement instrument and any losses due to additional components such as connecting cables/attenuators/switches, etc. The signal flow graph includes proper placement and values of the source nodes corresponding to each RF sub-system enumerated above. Noise figure measurements may include a calibration step and a measurement step. During the calibration step the noise figure and the noise temperature of the measurement instrument used for the measurement may be obtained. During the measurement step, the noise figure and the noise temperature of the device may be obtained based at least on the noise figure and noise temperature of the measurement instrument obtained during the calibration step.

The invention provides a testability analysis method and device for electronic equipment. The method includes determining multiple functions to be achieved by to-be-built electronic equipment; determining information flow relations between the multiple functions; determining multiple hardware parts required to achieve the multiple functions and building a hardware part set; determining the information flow relations between the multiple hardware parts according to the information flow relations between the multiple functions; building a multi-signal flow graph model of the hardware part set according to the information flow relations between the multiple hardware parts; determining the testability index of the hardware part set according to the multi-signal flow graph model of the hardwarepart set; and analyzing whether the testability index of the hardware part set accords with electronic equipment building conditions. Through the information flow analysis on functional levels, the establishment of the testability information flow model at hardware levels can be reduced. The state of testability can be known in the functional level and assistance is provided for system staff in consideration on testability, the difficulty of testability works can be reduced, and popularization can be achieved easily.

The invention discloses a method for determining the diagnosability of an angular rate measuring sensor of a satellite based on a correlation matrix. The method comprises the following steps of: (1) dividing functional modules of the angular rate measuring sensor, establishing a signal flow diagram of each module, and marking specified measuring points in the signal flow diagram; (2) performing failure mode and effect analysis (FMEA) on the angular rate measuring sensor, determining the failure mode, failure occurrence probability, failure severity and failure effects of the angular rate measuring sensor, and according to the failure effects, adding the failure mode into the signal flow diagram; (3) establishing a failure-measuring point correlation matrix; (4) assigning the failure-measuring point correlation matrix; (5) according to the failure-measuring point correlation matrix D which is established in the step (4), performing failure detectability analysis on the angular rate measuring sensor; (6) according to the failure-measuring point correlation matrix D which is established in the step (4), performing failure isolability analysis on the angular rate measuring sensor; and(7) determining the diagnosability of the angular rate measuring sensor, and measuring the diagnosability according to failure detection rate RD and failure isolation rate RI.

The invention discloses a method for designing an aircraft automatic flight control system rolling attitude control structure based on signal flow graphs. The method comprises the steps of firstly approximately separating local signal flow graphs of a Dutch roll motion mode and a rolling motion mode from a general signal flow graph of aircraft lateral motions; secondly, selecting a forward channel with the minimum number of integrators to act as a control transmission channel of each mode, and determining an optimal feedback loop so as to improve damping and natural frequency characteristics; and finally, configuring the determined feedback control loop to the general signal flow graph of the lateral motions, and determining a lateral rolling attitude control structure. The method disclosed by the invention overcomes a defect that an automatic flight control system rolling attitude optimal control structure cannot be determined because a feedback control loop is selected according to design experience in the prior art.

The invention discloses a logic expression extraction and switch level design method for a CMOS transmission gate logic circuit, and the method comprises the steps: carrying out the expansion of a Boolean algebra system, and obtaining an expanded Boolean algebra system; a CMOS transmission gate logic circuit establishing a corresponding switch level signal flow graph model; extracting the equivalent signal flow graph model of the circuit output function by the model, and obtaining the switch-level function expression of the circuit by combining the switch-level signal flow graph model with an extended Boolean algebra system, so that the CMOS transmission gate logic circuit is obtained. According to the CMOS transmission gate logic circuit designed through the method, the number of required MOS tubes is small, the number of required connection wires is small, power consumption can be reduced, and the chip area can be saved; and the designed switch level CMOS transmission gate logic circuit is full in swing amplitude, and is suitable for the design of a low-power consumption CMOS circuit.