889 results about "Signal timing" patented technology

A transceiver in a vehicle-to-vehicle (V2V) communication and safety system that regularly broadcasts safety messages, comprising location, heading and speed, of a subject vehicle, that are free of MAC and IP addresses. The V2V system uses the location of the subject vehicle for vehicle identification, in place of a pre-assigned vehicle ID. Some embodiments broadcast safety message in self-assigned time slots in a synchronized TDMA broadcast architecture, with unusually short inter-message gaps and unusually short messages. The TDMA frame is partitioned into three prioritized time interval classes with differing priorities and dynamically changing sizes based on demand of higher-priority messages. Time slot selection uses weighted algorithms. Selected time slots are held until either a message collision or a timeout occurs. A transceiver equipped vehicle may proxy a different subject vehicle. Embodiments include optimized traffic flow and signal timing.

Device, system and method, in a vehicle communication system, of providing guidance, route and safety information to a driver. Embodiments use the observation and storage of signal light timing information to make recommendations. Embodiments include computation of future times of signal light changes. Embodiments use information relating to the number of vehicles, location of vehicles, and speed of vehicles in a plurality of lanes approaching a signal to recommend lane changes to a driver. Embodiments include receiving timing information wirelessly about signal timing. Embodiments include using historical information to compute a risk value for a location and then generating a recommendation to a driver responsive to that risk value. Embodiments include using speed of travel on route options to compute an expected travel time, and then generating a recommendation to a driver responsive to those computed travel times.

Techniques for locating wireless devices involve a wireless device making measurements of signals transmitted by geographically distributed base stations within a wireless network. If some key site information is known about these transmitters, such as the transmitter location, transmit signal power, signal propagation, and transmit signal timing, measurements of these transmit signals by a device to be located can be used to determine the position of the device. In this example, all information exchange between the device and the location node is facilitated by a data link that is not provided by the wireless network providing signals used in the location estimation process. Accordingly, devices may be located based on downlink signal measurements made by the devices, where the devices are not part of the wireless network, are not provided wireless service by the network, and do not possess the ability to transmit signals to the wireless network, and where communication resources of the wireless network are not consumed to facilitate location.

Techniques for interfering with communications made according to a wireless standard between a beacon and a wireless device. The techniques determine a characteristic that is required by the standard for a signal produced during the communication. Then an interference signal is generated that is specifically adapted to the characteristic and interferes with the characteristic such that the wireless device and the beacon cannot interact as provided for the communication by the wireless standard. The techniques may be used to suppress legitimate wireless beacons in an operational area, to establish a baiting beacon in the operational area, or to interfere with communications between a wireless device and a baiting beacon or other beacon. The interference signal is specifically adapted to the characteristic in a way that greatly reduces the amount of power required for the interference signal and the conspicuousness of the interference signal.

The invention relates to a traffic control method and system based on an intersection group.The method comprises the steps that 1, 360-degree panoramic video of intersections is dynamically collected in real time through an intelligent robot, an intersection operation model is established according to video data, and traffic characteristics of the intersection group are analyzed according to the intersection operation model; 2, intersection index evaluation and online simulation analysis are conducted according to the traffic characteristics, and the traffic operation state of the intersection group is identified; 3, supersaturation state intersection signal timing control scheme optimization is conducted on critical paths of a supersaturation state intersection group, and a supersaturation state intersection group traffic signal control strategy is adjusted; 4, the adjusted intersection group traffic signal control strategy is operated, and steady-state operation of an intersection control signal timing optimization scheme and linkage command of the intelligent robot are achieved.By means of the traffic control method and system based on the intersection group, traffic efficiency and service level of intersection single point control can be improved, and therefore the operation efficiency of an urban traffic system is greatly improved, and urban traffic jams are relieved.

The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

Coordinated multipoint communication is a technology for improving cell-edge performance for users in a cell-type mobile communication system. In order to enable a coordinated multipoint transmission / reception operation, a user equipment report of a local environment is required to select both coordinated communication modes and communication partners in evolved Node B (eNB) base stations. According to the present invention, a method is described for feeding back information from User Equipment (UE) to a serving base station to enable a coordinated multi-point transmission / reception operation. The information reported through the feedback is classified into two categories corresponding to received signal intensity information and received signal timing information. The UE may select one or both types of information from between the categories to provide feedback. In embodiments of the present invention, various overhead-reducing reporting formats are described.

The invention discloses a signal timing optimization method based on a variable guide lane. After the functional attribute of the variable guide lane is changed, each veering traffic flow saturability is obtained by each veering traffic volume obtained by a detector, and different signal timing optimization schemes are determined according to the saturability. The method particularly comprises the steps that when the saturability is lower, smallest delay is taken as a control target, and a period and signal timing are determined by adopting a traditional Webster method; when the saturability is larger than 0.9, the intersection traffic capacity improvement and the delay reduction are taken as targets, and when some veer is over-saturated, the period and the green signal ratio are adjusted by a hill-climbing method; when each veer is saturated, a phase position is added on basis of common four phase positions, a phase position group is redistributed, a key phase position chain of each combined phase position group is found, and green signal lamp time is distributed according to an equisaturation principle; the aims of reducing total delay at an intersection and improving the traffic capacity are achieved.

The invention provides a real-time road traffic signal coordination optimization control method and a control system thereof and solves problems that real-time optimization for control characteristic parameters such as a signal period and a green signal ratio according road traffic flow change can be not realized in a traffic signal control system mainly in a multi-period fixed signal timing mode; traffic pass efficiency and pass capability are not high; traffic congestion or even traffic jam can not be effectively ameliorated. According to an active optimization real-time driving system based on traffic data, macroscopic control strategies and microscopic tactical control strategies are made according to different dynamic and static traffic scenes, main-line coordination optimization control and real-time dynamic crossing optimization control are actively carried out, the control characteristic parameters such as the signal period and the green signal ratio are dynamically adjusted and generated, dynamic benefit evaluation is controlled through controlling operation characteristic indexes, and real-time coordination control is carried out through gradual operation monitoring and repeated optimization searching.

The invention provides a traffic flow surveying and handling method based on an unmanned aerial vehicle high-definition video. The method comprises the steps of video capture, wherein an unmanned aerial vehicle is made to hover over a selected urban road intersection for high-definition video shooting; image stabilization and pre-processing, wherein the high-definition video is copied, stabilization and pre-processing are carried out on images, and then an image sequence is output; detection and tracking, wherein detection and tracking are carried out on moving objects with the image sequence treated with image stabilization as source data; analysis and statistics, wherein traffic flow analysis and statistics are carried out on a target ID which is tracked down and the current coordinates of motion; output, wherein traffic flow statistical data are transmitted to a client-side graphical interface for display, and then data and statements are generated. The traffic flow surveying and handling method based on the unmanned aerial vehicle high-definition video is capable of obtaining various high-accuracy traffic data, reducing the workload of field survey remarkably, preventing the traffic from being affected, obtaining statistic data of all traffic flows in twelve directions of the intersection, and providing data support for congestion control such as intersection signal timing optimization and traffic channeling improvement.

The invention discloses a method for setting a crossing self-adapting changeable driveway by a computer program, aiming to solve the problem that a single left turning driveway is supersaturated and two left turning driveways are insufficient. The method comprises the following steps: firstly installing a No. 1 triggering detector, a No. 2 triggering detector, a main signal light and a pre-signallight; and utilizing other existing hardware equipment. The method also comprises the following steps: (1) judging the attribute of the changeable driveway, i.e. judging the attribute of the changeable driveway by whether an inequation that N is larger than or equal to N<*> is established or not, wherein N is the continuous periodicity of the time occupancy ratio of the No. 1 triggering detector and the No. 2 triggering detector, which is larger than a critical value, and N<*> is the critical value triggering changeable driveway control; (2) controlling the signal timing scheme optimization ofthe changeable driveway, i.e. (1) controlling the changeable driveway when signal period time is unchangeable, and (2) controlling the changeable driveway when the signal period time is changeable; and (3) setting a pre-signal of the changeable driveway, i.e. (1) changing the attribute of the changeable driveway from straight running to left turning, and (2) changing the changeable driveway fromthe left turning to the straight running.

An apparatus and method are described for reducing the timing skew on a printed circuit board including a plurality of conductive traces interconnecting a first node and a second node. At least one section is removed from at least one printed circuit board trace to thereby sever a trace and prevent signals passing from the first node to the second node from following the severed trace. In this manner, signal path length can be adjusted to reduce timing skews in the circuit. Sections are removed from the traces by using a laser, CVD, a router, a plasma or by passing sufficient current through weakened areas of the traces.

The invention belongs to the field of urban traffic control, and provides a self-adaptive intersection signal control method. By installing vehicle monitors to detect the number of vehicles, the lengths of vehicle queues are acquired, and a signal control strategy for the next cycle is determined according to the lengths of vehicle queues at an intersection in the previous cycle. The method utilizes the vehicle detectors already arranged in a city to acquire traffic flow data and calculate the length of the queue of each lane, and the signal timing scheme of the next cycle is dynamically adjusted according to the different proportions of queue lengths. Taking a cycle as a unit, a timing scheme is calculated, the load of calculation is low, and moreover, the method also can achieve the purpose that intersection signals can be self-adaptively controlled according to the density of traffic flow. In addition, the algorithm of the method is simple, and the method has low requirement on hardware and construction quantity, and therefore is convenient to popularize.

A method for optimizing a source synchronous clock reference signal timing to capture data from a memory device (e.g., DDR SDRAM) includes conducting an iterative two-dimensional data eye search for optimizing the delay of the source synchronous clock reference signal (e.g., DQS). Embodiments of the present invention are directed to tuning the delay for each device for the optimal margin in two dimensions: maximize the distance from the data eye walls and maximize the noise margin on the interface. An iterative data eye search is performed while varying the DQS delay timing and noise margin.

A scintillation block detector employs an array of optically air coupled scintillation pixels, the array being wrapped in reflector material and optically coupled to an array of silicon photomultiplier light sensors with common-cathode signal timing pickoff and individual anode signal position and energy determination. The design features afford an optimized combination of photopeak energy event sensitivity and timing, while reducing electronic circuit complexity and power requirements, and easing necessary fabrication methods. Four of these small blocks, or “miniblocks,” can be combined as optically and electrically separated quadrants of a larger single detector in order to recover detection efficiency that would otherwise be lost due to scattering between them. Events are validated for total energy by summing the contributions from the four quadrants, while the trigger is generated from either the timing signal of the quadrant with the highest energy deposition, the first timing signal derived from the four quadrant time-pickoff signals, or a statistically optimum combination of the individual quadrant event times, so as to maintain good timing for scatter events. This further reduces the number of electronic channels required per unit detector area while avoiding the timing degradation characteristic of excessively large SiPM arrays.

A system and method for determining the position of people and / or objects, whether mobile or stationary, is presented herein. The system uses fixed and / or portable FM transmitters to transmit synchronized signals. These signals are acquired by a Receiver device which uses the signal timing to perform Time Difference of Arrival calculations to determine the Receiver's location. Then, using some arbitrary communications method, such as wireless communications, the Receiver device can forward its location to some arbitrary type of application system.

The invention relates to the field of intelligent transportation, discloses a new emergency vehicle preferential pass method and system based on vehicle-road cooperation, and particularly provides a new emergency vehicle preferential pass method for signal timing and vehicle speed guidance of an intersection. The new emergency vehicle preferential pass system comprises a road side unit and a vehicle-mounted unit. By means of a vehicle-road cooperation method, due to real-time information interaction between an emergency vehicle and a road side signal control system, when the emergency vehicle gets into an intersection communication range, the road side signal control system can generate a corresponding emergency vehicle preferential pass scheme according to the current signal phase and the actual situation of vehicles queuing up at the intersection. Under the premise that vehicle confliction is avoided, signal timing and vehicle speed guidance are carried out, and therefore the emergency vehicle passes preferentially. Meanwhile, by means of the new method, adverse effects of preferential pass of the emergency vehicle on conventional social traffic flow can be reduced.

A technique is described for determining the timing of a received signal that includes one or more time-delayed versions of a reference signal traveling over respective different signal paths. The technique includes correlating the received signal with the reference signal to produce a correlated signal; determining whether the correlated signal includes a signal peak that corresponds to the direct path of the received signal; and iterative repeating these operations until a signal peak is determined to correspond to the direct path of the received signal. In each successive iteration, the reference signal corresponding to at least the greatest signal peak in the correlated signal is regenerated, and contributions from each regenerated reference signal are removed from the received signal prior to correlating the received signal in the next iteration.

The invention discloses an intersection signal timing control optimization method and device, and relates to the technical field of computers. A specific embodiment of the method comprises the steps of acquiring a state-action-reward sample set, wherein the state-action-reward sample set comprises state-action-reward sub-sample sets of at least one intersection; based on a neural network and the state-action-reward sample set, performing training to obtain a traffic state simulator; and on the basis of enhanced learning, the state-action-reward sample set and the traffic state simulator, performing training to obtain a signal timing control model. According to the method and the device, the traffic state simulator can be obtained by training based on a neural network model and the state-action-reward sample set, and the signal timing control model is obtained by training based on the traffic simulator and the enhanced learning. The problem that simulated data does not conform to actualtraffic conditions and is inaccurate due to collection or assumption of multiple traffic parameters in the prior art is solved, and the universality and flexibility are improved.

An optical transmitter for converting and coupling an information-containing electrical signal with an optical fiber having an electrical input for coupling with an external electrical cable or information system device having a plurality of parallel data lines, a modulator for converting between an information-containing electrical signal on each data line and a multi-level digital pulse amplitude modulated signal corresponding to the binary electrical signal; and a signal timing circuit coupled to said modulator for aligning the data signal to a predetermined clock signal. The transmitter is preferably wavelength division multiplexed, using an electro-optical subassembly coupled to each respective timer circuit for converting between the information-containing electrical signal and a modulated optical signal corresponding to the electrical signal at a predetermined wavelength. The transceiver is preferably implemented in a pluggable standardized form factor.

The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.

The invention relates to a control method and a system for intersection signal timing guaranteeing the priority of buses. The system adopts an ultrahigh frequency RFID (Radio Frequency Identification) technique to achieve the remote recognition, acquisition and control of information of an onboard unit; and adjusting an intersection signal timing scheme through an optimization algorithm by collecting the information of buses in all direction of an intersection, so as to provide control of passing priority for buses. The control method solves the bus priority mode on common urban roads, and realizes the bus passing priority on the basis of maximizing the overall operation efficiency of vehicles at the intersection, so as to improve the operation efficiency of buses. In addition, the control method is low in cost and convenient to implement and becomes effective fast, and achieves the win-win of the bus priority and the overall operation efficiency of the intersection, so as to reduce delays of buses at urban intersections and ensure the punctuality of buses.

The invention is directed to intersection traffic control under an automatic driving and manual driving vehicle mixed traveling condition, and designs an advanced control method to improve the trafficefficiency of the mixed traveling condition under the premise of ensuring safety. First, entrance lanes of intersections are divided into automatic driving lanes, manual driving lanes and mixed traveling lanes. Secondly, for vehicles arrived, according to the types of the vehicles, lanes are selected, right-turning vehicles enter the mixed traveling lanes, and straight-forward and left-turning vehicles respectively enter respective dedicated lanes. A new signal timing scheme is designed, the manual driving vehicles are still in accordance with the signal timing scheme in the intersections totravel, while the automatic driving vehicles pass through at the full red time of a signal period, and self-organized traffic based on position reservation is adopted to avoid conflicts.

The invention provides an urban trunk road vehicle trajectory reconstruction method based on fixed-point detector and signal timing data fusion. The method comprises the following steps: 1) establishing a basis matrix: determining a road occupation condition matrix Point[n, distance, t] at the t moment according to a vehicle running matrix Car [vehicle, t] at the t time, and then, calculating vehicle most probable running status at the t+t0 moment according to the road occupation condition matrix Point[n, distance, t], and thus a Car [vehicle, t+t0<->] constant iterative process is generated; 2) carrying out vehicle generating; 3) carrying out vehicle behavior decision; and 4) judging whether trajectory reconstruction is finished. The method has the advantages of fusing fixed-point detector and signal timing data, not depending on high-quality floating car data and demanding less on traffic data acquisition environment. The method is suitable for multilane and coming / going vehicle traffic interference cases, is wide in applicability, is complete and comprehensive in reconstructed trajectory, and can realize the functions of environment assessment, signal control coordination, travel time estimation and jam state early warning and the like.

The invention discloses an intersection traffic organization and signal timing dial method for tailgating opposite exit lane left-hand turning. According to the method, the problem that the number of left-turn vehicle entrance lanes and the number of left-turn vehicle exit lanes in a signal intersection are not matched is solved, phase position and sequence optimization in signal control is matched, an intersection releasing mode is reorganized, left-turn motor vehicles are made to turn leftwards by occupying the exit lanes, and therefore the left-turn traffic capacity of the intersection is improved. Emptying signal lamps are arranged to empty the queue of a left-turn tailgating motorcade, and the traffic flow conflict of the next conflict phase position is avoided. The left-turn traffic flow traffic efficiency can be effectively improved, the vehicle mean delay of the intersection is overall reduced, and the service level of the intersection is improved.

Techniques for co-existence on a shared communication medium are disclosed. In one example, transmission in accordance with a first Radio Access Technology (RAT) may be punctured on one or more active periods of a Discontinuous Transmission (DTX) communication pattern based on monitoring of signaling associated with a second RAT. In addition or as an alternative, a transmission power level of an access point for transmission in accordance with a first RAT may be reduced based on one or more signal timing characteristics of signaling associated with a second RAT.

The invention discloses an online learning method for optimizing a signalized intersection queuing length. The online learning method comprises the following steps of: 1, selecting states, behaviors and rewards; 2, reinforcing a learning matrix updating formula; 3, establishing a simulation optimizing platform; and 4, carrying out online operation. The online learning method is a signal timing dial optimizing technology which is capable of calculating a globally optimal solution and has the memorability. Compared with the risk neutral reinforcing learning technology, the online learning method has the advantages of no need of advanced offline learning, and better instantaneity and adaptability.

A device for use in, and system for, a vehicle-to-vehicle (V2V) communication and safety system that uses a hybrid combination of TDMA and CSMA protocols. The synchronized TDMA frame is partitioned into three prioritized time interval classes with differing priorities and dynamically changing sizes based on demand of higher-priority messages. The TDMA portions of a repeating time interval uses self-assigned dense time slots for high-priority safety messages, with one portion for emergency vehicles and road-side units. The CSMA protocol uses remaining available time for lower-priority and overflow messages. The higher-priority time interval classes change size dynamically based on the number of current transmissions. Modulation schemes, but not data link formats, use existing Standards. Embodiments include optimized traffic flow and signal timing.