317 results about "Total delay" patented technology

Multi-media networks will require that a data flow be given certain quality-of-service (QOS) for a network connection but pre-negotiation of this sort is foreign to the current data networking model. The real time traffic flow in the data network requires distinct limits on the tolerance to delay, and the variations in that delay. Interactive voice and video demand that the total delay does not exceed the threshold beyond which human interaction is unacceptably impaired. The present invention allows the network to discover the nature of the service for each traffic flow, classifies it dynamically, and exercises traffic conditioning by means of such techniques as admission control and scheduling when delivering the traffic downstream to support the service appropriately.

A ring oscillator includes a coarse delay control block including a plurality of coarse delay gates, and a fine delay control block including a plurality of fine delay gates. The total delay of the fine delay control block is larger than a single delay step of the coarse delay control block, whereby variations of the delay step do not cause an adverse effect on the jitter characteristic of a PLL circuit having the ring oscillator. In a normal operation, the coarse delay control block increments the delay step after the total of the delay steps of the fine delay control block exceeds the delay step of the coarse delay control block.

The invention relates to an urban intersection traffic signal control method, relates to a multi-phase-jump and vehicle full-dynamic induction traffic control method, and aims to flexibly control traffic signals at intersections by using a traffic signal instrument so as to improve the traffic pass property of vehicles at the intersections and reduce the total delay time of vehicles. The method comprises the following steps: 1) setting an upstream vehicle detector and a parking line vehicle detector at each lane of a traffic intersection, and detecting dissipating vehicle and information of vehicles entering the intersection in real time; 2) according to the numbers of vehicles waiting in different lanes and vehicles running into the intersections, automatically transmitting passing signals to busy lanes by using a busy lane priority pass method through a traffic signal instrument control system so as to induce the vehicles in the lanes to pass prior; 3) by using a method that compatible lanes adopt one same phase and non-compatible lanes are subjected to phase-jump induction control, providing the priority pass right for lanes with a plenty of waiting vehicles or a lane into which a plenty of vehicles run. Due to the adoption of the method, a relatively good induction effect can be achieved at intersections with unsaturated traffic vehicles.

Systems and methods for reducing the noise level in a multi-channel digital audio system by staggering the timing of the pulse-width modulation in the different channels and thereby reducing the magnitude and increasing the frequency characteristics of the generated switching noise. One embodiment comprises a multi-channel digital PWM amplifier in which the timing signals used by each channel's modulator are staggered to evenly space the switching edges of the generated PWM signals. An additional, complementary delay is implemented in each of the channels to equalize the total delay for each channel so that the outputs of the channels are synchronized. The different channels may be implemented on different chips, in which case the chips may be synchronized prior to staggering the signals processed in each of the channels.

In order to fully automate the inflation timing and deflation timing of an intra-aortic balloon pump, certain delays intrinsic in the system must be taken into account. A process for calculating these delays includes determining a nominal inflate command time, adding a dither time interval to the nominal inflate command time to obtain an actual inflate time, and determining a deflate command time. An inflation/deflation cycle is then processed in which the intra-aortic balloon pump is inflated at the actual inflate command time and deflated at the deflate command time. Blood pressure data is acquired from the patient during the inflation/deflation cycle, and is then analyzed to determine a realization time at which the effects of inflating the intra-aortic balloon are realized on the blood pressure waveform. From this the total delay time between the actual inflate command time and the realization time can be determined.

The invention discloses a satellite network based on distributed-type SDN and a construction method thereof, wherein the satellite network adopts a GEO/MEO/LEO three-layer satellite network model. The invention proposes a distributed-type software defined satellite network DSDSN network for the GEO/MEO/LEO three-layer satellite network and proposes a controller system configuration strategy for the same-layer satellite cluster based on the controller clustering technology. The strategy is based on the ideas of an ant colony clustering algorithm and through the selection of appropriate control nodes, the position and number of the controllers can be properly configured; the communication nodes can be deployed according to the formed controller cluster so as to reduce the total delay from the communication nodes to the neighboring controller node. The centralized management of the invention has a global view of all the nodes in the entire network, can grasp the status of satellite nodes and improve the survivability of the network. The invention reduces the routing cost by optimizing three parameters of the link connection duration, the total delay and the satellite resources.

The invention discloses a method for generating high-precision stepping delay capable of dynamic calibration, relating to an electronic technique. The method is realized based on a programmable delay chip, a high stability crystal oscillator and a field programmable gate array (FPGA) technology. In the method, a digital phase-lock technique is utilized to compare the delay value of the programmable delay chip with a high stability reference time base signal, so that the calibration for the delay value of the programmable delay chip can be realized. Because the stepping delay of the programmable delay chip and the total delay range are restricted mutually, the high stability crystal oscillator is combined with the programmable delay chip, thus realizing delay output with a wide range, small a stepping quantity and high precision. The method is used to provide launching and sampling timing sequences for equivalent sampling in radar signal acquisition, and has the advantages of wide usable range and high test precision.

The invention relates to the technical field of optical network communication, in particular to a tunable multi-loop multi-system optical buffer based on an N*N optical switch matrix, comprising an N*N optical switch matrix, an optical switch control module and N-1 optical delayers, wherein the delay time of the N-1 optical delayers is designed to be K times with each other, i.e. the delay time meets a K system relation; if rotation cycles of light in each loop are respective n1, n2, ..., n<N-1>, the total delay time of the buffer is T=n1d1+n2d2+...+n<N-1>d<N-1>, and the least delay time of the optical delayer can be designed by adjustable least precision according to the requirements. The adjusting speed of the optical buffer can reach nanosecond class high-speed response, the adjusting precision is high and stable, and the large dynamic adjusting range can be realized; and the optical buffer has simple structure, low cost and high reliability. The optical buffer capable of flexibly tuning in the large dynamic range has a practical meaning in optical packet switching, all-optical calculation, optical information processing and optical synchronous time slot alignment.

The invention provides a network unloading method based on mixed cloud computation. The model defines transmission delay, processing delay and total delay for computing unloading computation beginningfrom the single-user unloading computation problem, and a single-user optimal solution is obtained by using a branch-bound algorithm. The boundary computing resource limitation and the transmission interference between the users are considered on this basis, the multi-user computing unloading problem is modelled as a hybrid integer linear planning MILP problem; due to the high computation complexity of the MILP problem, the model designs an iterative heuristic moving boundary computation resource allocation IHRA algorithm to solve the MILP problem and makes the unloading decision. A simulation result shows that the IHRA algorithm designed by the invention is superior to the standard algorithm in the application program running delay and unloading efficiency, and a new solution scheme is provided for the resource allocation problem of the hybrid cloud computation network unloading model.

The invention discloses a method for automatically adjusting urban rail transit train operation. According to the scheme, the situation that a train operation adjustment system is a discrete event system is taken into consideration, formal modeling is conducted on the system, and decisions are made with the total delay time of trains and the delayed train number as the indicator to select different adjustment methods to adjust the trains; after a dispatcher selects an adjustment mode according to hints at a workstation HMI, the train operation adjustment system is informed of the selected adjustment mode information through data in the JSON format; a news subscription mechanism is adopted for the train operation adjustment system and station arriving events and station departing events of online trains are obtained in a CORBA mode; a station arriving event triggering system or a station departing event triggering system of the trains enables train operation to be restored to a normal and orderly state rapidly according to the set adjustment mode. The method has the advantages of being scientific, reasonable, easy to implement, high in adjustment efficiency and practical.

The invention discloses a collaborative multi-objective optimal allocation method for airway time slot resources. The method includes the steps that an airway time slot resource collaborative decision-making information platform is established, planned airway and temporary airway information in a flow-limited airspace and available time slot information and flight operation information of a planned airway downstream airspace unit are acquired, a collaborative airway time slot allocation algorithm is made, objective functions and constraint conditions meeting the requirement for validity are established with the minimum total delay loss of all flights, the minimum total number of turning points of all the flights and the minimum average delay time of passengers as objectives respectively, a multi-objective optimization model for collaborative airway time slot resource allocation is established, a non-inferior solution set is obtained by solving the model, an airway time slot resource allocation strategy set is formed, and airway time slot resource allocation strategies are issued through the airway time slot resource collaborative decision-making information platform.

The invention discloses an urban rail transit part route operation regulating method in an emergency scene. The method comprises the following steps of S1, obtaining the rain operation and route parameters of a rail route, the position of an emergency event, and the fault parameter, so that the interruption time is determined; S2, determining an alternative part route foldback scheme according to the train operation and route parameter, the position and the fault parameter of the emergency event, and the interruption time; S3, building the total target function of the rail route operation regulation according to a station total retention number model and the total delay time model of arrival and departure of all trains in the part route foldback scheme; S4, solving the total target function by using a particle swarm algorithm of the convergence factor and the weight; determining the optimum part route foldback scheme. When the part route foldback scheme is used for regulating the rail transit operation under the condition of the emergency event, the problem of station passenger retention can be well solved; the rail train is promoted to recover the normal operation.

The invention relates to an atmosphere water vapor detecting method based on a plough satellite GPS united chromatographic method. The method comprises the following steps that a plough satellite/GPS receiver receives a satellite signal and carries out united resolving, atmosphere total delay is computed; real-time weather measured data are collected, statics delay is computed; a carrier phase observed value received by the plough satellite/GPS receiver is obtained, ionized layer delay is computed; the statics delay and the ionized layer delay are deducted from the atmosphere total delay, wet delay is obtained; water vapor content on satellite signal routes is computed; a horizontal constraint condition and a vertical constraint condition are added according to the water vapor content on a plurality of satellite signal routes, and a four-dimensional atmosphere water vapor model is obtained and displayed. A plough satellite system is introduced, the monopoly position of a GPS can be broken, the atmosphere water vapor detecting method has the advantages of being low in cost, wide in detecting range and high in real-time degree, influence from weather conditions is avoided, maintaining is easy, real-time high-accuracy water vapor horizontal and vertical distribution conditions are provided, and significance for study on the atmosphere science field is achieved.

This invention provides a kind of measuring method for unidirectional delay, which is message transmission delay from transmitting part to receiving part. It concludes: A) transmitting part keeps the delay to the neighboring next node in the current message and transmits it to the neighboring next node; B) the node, which receives the said message, is used as current transmitting part. Step A is repeated until current node is receiving part; C) receiving part abstracts each delay kept in the message and calculates total delay. Or when transmitting message to next node every time, the kept delays are accumulated. This invention does not need time synchronism between network node facilities to achieve precise unidirectional delay measuring.

The present invention discloses a time delay test system and method used for virtual reality helmet acceleration motion. The time delay test system used for the virtual reality helmet acceleration motion is characterized in that an arc-shaped scale, a virtual reality helmet and a camera are arranged orderly at intervals along a straight line and are fixedly arranged on a controllable rotating disc, a servo motor is arranged below one side of the controllable rotating disc, and the output shaft of the servo motor is fixedly connected with the controllable rotating disc; a display screen of the virtual reality helmet displays a virtual scale, the servo motor drives the controllable rotating disc to rotate at a constant angular velocity, and the camera shoots the arc-shaped scale and the virtual reality helmet on the controllable rotating disc; the interface of the virtual scale of the display screen of the virtual reality helmet in an image is analyzed to obtain the measurement amount, and further the delay amount of the virtual reality helmet is calculated. According to the present invention, a time delay test of the virtual reality helmet acceleration motion is realized, the total delay of the system is measured accurately, a view angle error brought by shooting can be avoided, the system accuracy is improved, and a final test result is accurate and reliable.

The invention discloses a method for eliminating channel delay errors based on TDOA (time difference of arrival) positioning, which solves the problem of large positioning-result errors caused by the interference (arising from the channel delay difference of a monitoring node) on the TDOA measurement value. The method comprises the following steps that: a clock synchronizer GPS (global position system) carries out clock synchronization on a receiver; after receiving a positioning instruction of a positioning network management center, the receiver carries out time mark making on monitored signals at the same moment; simultaneously, a monitoring-node digital unit stores AD (alternating/direct) sampling signals; a monitoring node sends the AD sampling signals to the management center, and the management center carries out statistics on the channel delay difference of the receiver; the management center calculates the total delay difference according to a GCC (Gnu C Compiler) algorithm; the management center calculates an air transmission delay difference by using the total delay difference and the channel delay difference; and the management center positions target nodes according to the air transmission delay difference. By using the method disclosed by the invention, the errors (arising from the channel delay difference) on time delay estimation can be reduced, and the accuracy of network positioning can be improved.

The invention discloses a method for arranging steering buses in sequence in a bus stop at the inner side of a road. The method comprises the steps that according to collected bus real-time information, time when one bus reaches a downstream intersection is predicted, passenger delay caused by steering and a signal phase sequence of the bus is analyzed, so that an optimal scheme of the bus sequence is generated, a driving waiting zone and a signal control light are arranged at the bus stop at the inner side of the road, and therefore the bus operation sequence is effectively adjusted. According to the method for arranging the steering buses in sequence in the bus stop at the inner side of the road, from the perspective of bus operation time and with the combination of bus operation experience data and real-time collected data, the time when one bus reaches the downstream intersection is accurately predicted, passenger delay caused by the driving sequence of the steering buses is accurately judged according to an original green light interval time table, and the reliable steering bus sequence is formed; the driving waiting zone is arranged at the bus stop, so that under the condition of linkage control of an outlet portion and the signal light of the driving waiting zone, the buses are rapidly and effectively lined, total delay of the steering buses in the intersection is reduced, prior passage of the buses at the signal intersection of the downstream is guaranteed, and the operation efficiency of the buses is effectively improved.

A Jam Factor rating is provided that represents the status along a specified driving route. The driving route is specified such that the route includes at least one road. A free flow travel time is calculated for the specified route. Then, the total delay is calculated for the specified route. The free flow travel time and the total delay are summed to obtain the total estimated travel time along the specified route. A delay multiple is then calculated by dividing the total travel time by the free flow travel time. The Jam Factor rating is then calculated based on the delay multiple.

The invention discloses a bus priority signal control method based on multiple requests in a vehicle networking environment, aiming at overcoming problems that a current bus priority signal control method has low prediction precision and cannot satisfy priority of multiple buses. The bus priority signal control method based on multiple requests in the vehicle networking environment includes the following steps: 1, collecting real-time information in the vehicle networking environment, and detecting multiple bus priority requests; 2, determining running statuses of the buses and determining whether the bus is behind a timetable; 3, predicting the time when the bus arrives at an intersection; 4, determining a signal control scheme that satisfies priority of multiple buses, including 1) solving green time required to meet the priority requests of multiple buses, 2) calculating a bus priority signal control scheme for a current period, 3) solving a signal control scheme of the next periodbased on a green time compensation algorithm, 4) calculating total delay of the intersection of each signal control scheme, and selecting the priority signal control scheme with the smallest delay.