579 results about "Collision probability" patented technology

A system and method of providing distributed election of a shared transmission schedule within an ad hoc network. The invention includes a collision-free access protocol which resolves channel access contentions for time division multiple access (TDMA) of a single channel. Time-slots are organized into part numbers, which are included within sections, a sequence of which define a block. Each node is given a ring number according to its location within the network topology and maintains local neighbor information along with its own part number and message digest. Collision-free channel access is automatically scheduled and repetitious contention phases are resolved by a random permutation algorithm operating in message digests. An empty time-slot utilization method is also described and data packets may also be transmitted subject to a non-zero collision probability within a blind section of the block.

The invention discloses an early warning method and a device for vehicle collision. The early warning method is characterized in that the method comprises the following steps: after a vehicle is fired, colliding an early warning system to begin initializing each parameter, using an OBD information collection module, a sensor information collection module and a GPS information collection module to collect information of the vehicle, using an inter-vehicle information exchange module to collect peripheral vehicle information, sending the information of the vehicle to the peripheral vehicles, calculating individualized collision probability according to self state of a driver, and warning the driver; and the device consists of the OBD information collection module, the sensor information collection module, the GPS information collection module, the inter-vehicle information exchange module, an information exchange module in the vehicles, a collision detection module and a vehicle collision warning module. Each module exchanges information in the vehicle through a wireless local area network in the vehicle, does not change an electric line of the vehicle and does not increase wire harness inside the vehicle, and can effectively reduce occurrence of traffic accidents, so as to reduce casualties.

The present invention relates to a method and system (10) for distance determination of RF tags (4) and its applications based on measuring the round trip delay, avoiding deterministic collisions between a plurality of wide band response signals transmitted by the tags (4) by adding a pseudo-random time delay to the wide band response signal, and iteratively reducing the collision probability between plurality of wide band response signals.

A vehicle risk level acquiring ECU calculates and acquires a plurality of courses of other vehicles around a driver's own vehicle, and acquires the predicted course of the driver's own vehicle. The vehicle risk level acquiring ECU calculates the collision probability of the driver's own vehicle as collision possibility on the basis of the predicted course of the driver's own vehicle and the plurality of courses of other vehicles.

A system and method of providing distributed election of a shared transmission schedule within an ad hoc network. The invention includes a collision-free access protocol which resolves channel access contentions for time division multiple access (TDMA) of a single channel. Time-slots are organized into part numbers, which are included within sections, a sequence of which define a block. Each node is given a ring number according to its location within the network topology and maintains local neighbor information along with its own part number and message digest. Collision-free channel access is automatically scheduled and repetitious contention phases are resolved by a random permutation algorithm operating in message digests. An empty time-slot utilization method is also described and data packets may also be transmitted subject to a non-zero collision probability within a blind section of the block.

A method for mapping surroundings of a vehicle, objects in the surroundings of the vehicle being detected with the aid of sensors and particular detected objects being described by two coordinate points and also by a position fuzziness assigned to the particular coordinate point, the coordinate points and the position fuzziness values being stored in an interface in the form of data which may be accessed by driver assistance systems of the vehicle. A method is also described for ascertaining the collision probability of a vehicle with an object, in which the surroundings of the vehicle are initially mapped using the method for mapping the surroundings of a vehicle, a travel path to be traveled by the vehicle is ascertained in a subsequent step, and the degree of overlap between the object and the travel path and also the collision probability are finally determined, taking the position fuzziness into account.

In a collision damage reduction system, a microcomputer obtains a first performance limit data of the own vehicle according to the detected speed thereof by a first detecting unit and a second performance limit data of the object according to the relative position data detected by a first detecting unit, the detected speed of the own vehicle and the detected turning angle thereof by a third detecting unit. The microcomputer calculates a total collision probability representing a probability that the own vehicle and the object will collide with each other on a runnable space according to the first performance limit data, the second performance limit data, the detected speed of the own vehicle and the relative position data. In addition, the microcomputer instructs the operation unit to operate at least one of the first operation and the second operation according to the total collision probability.

The present invention relates to a method and system (10) for distance determination of RF tags (4) and its applications based on measuring the round trip delay, avoiding deterministic collisions between a plurality of wide band response signals transmitted by the tags (4) by adding a pseudo-random time delay to the wide band response signal, and iteratively reducing the collision probability between plurality of wide band response signals.

One embodiment of the present invention provides a system that facilitates assessment of collision between a primary principal and a non-primary principal for early warning. During operation, the system receives information which indicates a state of the primary principal and a state of the non-primary principal. The system divides future time into a number of time intervals, and estimates a number of possible future states of the primary and non-primary principals, wherein each future state corresponds to a time interval. The system further represents the possible future states of the primary or non-primary principal as one or more geometric objects in a space of which at least one dimension indicates the time. In addition, the system determines a probability of collision between the primary and non-primary principals based on the geometric objects.

The invention discloses a resource determining method for a physical random access channel. The method comprises the step of configuring a plurality of physical random access channel resources for each piece of user equipment (UE), and the physical random access channel resources include at least one of the following resources: time domain resource, frequency domain resource, code domain resource and space domain resource, wherein the time domain resource is emission sub-frame configuration of a physical random access channel, the frequency domain resource is emission band configuration of the physical random access channel, the code domain resource emission sequence or orthogonal mask configuration of the random access channel, and the space domain resource is space access location configuration of the random access channel. The invention further discloses a resource determining device for a physic al random access channel. The PRACH resource reusing capability in a frequency division duplex system is improved, the PRACH collision probability is reduced, and the terminal access efficiency and the system throughput are improved.

The present invention relates to a collision prevention method for a RFID system and a RFID system to minimize the collision of response signals by using sector antennas and controlling the power. The present invention comprises the steps of: separating plural tags in a space by setting up plural number of sector antennas; setting up the output stages of the power of each sector antenna to be increased in plural sequential stages; and reading a tag belonging to the output range by selecting a first sector antenna and transmitting minimum power among the set up stages. The present invention considerably reduce the collision probability of response signals of tags by dividing the tags in a space when a reader reads or writes tag information. The present invention also minimizes the time consumed to read / write tags and improves the communication distance and capacity.

A method for controlling random access is provided, and the method includes that an access network element sets multiple random access backoff values according to the various types of the terminal classification; the access network element transmits a Random Access Response Media Access Control Protocol Data Unit (RAR MAC PDU) to a terminal, and the RAR MAC PDU contains the information of the random access backoff value set according to the classification; and according the type of the terminal itself, the terminal looks up the corresponding random access backoff value in the RAR MAC PDU to perform the random access delay processing. A system for controlling random access is also provided. With the present invention, the access collision probability of the terminal can be decreased enormously.

A method for determining an accident risk of a first object with at least one second object is proposed, a collision probability and a hazard probability of the at least one second object being determined in a predefined region around the first object, the collision probability and the hazard probability being determined as a function of motions and object classes of the first and the at least one second object. The accident risk is then determined as a function of the collision probability and the hazard probability.

The invention relates to an intelligent anti-collision system of a novel AGV for material handling. The system comprises a vehicle-mounted master control unit, an environment detecting unit, an action executing unit, an alarming unit and a remote control unit. The anti-collision system can achieve bidirectional multilayer protection on an AGV body. Forward protection of the AGV is achieved through a laser radar, an arc-shaped anti-collision buffer belt and a camera. Backward protection of the AGV is achieved through a laser distance measuring sensor and a U-shaped anti-collision buffer belt. A protection area of the anti-collision system is divided into a monitoring layer, a speed reduction layer and a parking layer from far to near. The detection data of the environment detecting unit are processed by the master control unit, and the AGV is controlled to execute corresponding actions, namely, normal running or speed reducing posture adjustment or parking. When a parking event occurs, the alarming unit gives an alarm, and the remote control unit is informed to carry out remote processing. The intelligent anti-collision system can effectively reduce the collision probability of the AGV, and the vehicle body is protected.

A system and method for vehicle collision mitigation with vulnerable road user context sensing. The system and method include determining one or more biosignal parameters and one or more physical movement parameters associated with a vulnerable road user (VRU). The system and method also include determining a context of the VRU based on the one or more biosignal parameters and one or more physical movement parameters associated with the VRU. Additionally, the system and method include determining one or more physical movement parameters associated with a vehicle. The system and method further include estimating a probability of collision between the VRU and the vehicle based on the context of the VRU, the one or more physical movement parameters associated with the VRU, and the one or more physical movement parameters associated with the vehicle. The system and method also include providing a human machine interface output response based on the estimation of probability of collision between the VRU and the vehicle, wherein the human machine interface output response is provided on at least one of the following: a head unit of the vehicle, a wearable computing device, and a portable device.

The invention provides a random access method and a terminal, and relates to the technical field of the communication. The random access method comprises the following steps: receiving random access mechanism configuration information sent by a base station, wherein the random access mechanism configuration information comprises random access type and random access time frequency resource information corresponding to the random access type, the random access type comprises a first random access mechanism and / or a second random access mechanism; and executing the random access process of the first random access mechanism or the second random access mechanism according to the random access mechanism configuration information. Through the above scheme, the terminal performs the random accessprocess according to the configuration information by acquiring the random access mechanism configuration information configured for itself by the base station, so that the terminal can perform the selection of the random access mechanism according to the own service situation; the problems of control plane processing delay, high data plane collision probability and low partial data resource use ratio are solved, and the reliability of the random access is improved.

The invention provides a configuration method of channel state information, a feedback method of the channel state information, a base station and a terminal. The feedback method of the channel state information includes the steps that a terminal side receives a configuration instruction sent by a base station side, and the terminal side feeds back an RI and / or a precoding type indicator, a precoding matrix indicator and a channel quality indicator to the channel state information of a plurality of non-zero-power channel state information reference signal resources configurated with the same interference measurement resources according to the configuration instruction, wherein the RI and the PTI are same, and the PMI and the CQI are independent. According to the technical scheme, the same RI and / or the PTI are fed back to the channel state information of the non-zero-power CSI-RSs configurated with the same IMRs, the rules for uplink feedback are simplified and unified while uplink feedback expenditure is greatly reduced, and the collision probability of uplink channel state information feedback is reduced.

The invention discloses an anti-collision control method for safety of in-obit operation of formation-flying satellites, in which influences of satellite contour dimension, various agitation errors, time forecasting error and position measurement error are seriously concerned, collision probability based description modes and determination methods for collision probability of the formation-flying satellites are systematically provided, and aiming at different operation situations of the formation-flying satellites, description indexes of integral and partial satellite collision possibility are respectively provided, so that the method is suitable for prevention of integral collision possibility of a plurality of formation-flying satellites. The method comprises the following steps: firstly, calculating collision probability density between two satellites, secondly, calculating the collision probability between the two satellites, and finally, calculating the collision probability of the formation-flying satellites. The method can be used for collision prevention for safety of in-obit operation of the formation-flying satellites, and can ensure real time and rapidity of determination of collision prevention for safety of the formation-flying satellites.

The invention provides a dynamic spectrum access method on the basis that the policy planning restricts Q learning, which comprises the following steps: cognitive users can divide the frequency spectrum state space, and select out the reasonable and legal state space; the state space can be ranked and modularized; each ranked module can finish the Q form initialization operation before finishing the Q learning; each module can individually execute the Q learning algorithm; the algorithm can be selected according to the learning rule and actions; the actions finally adopted by the cognitive users can be obtained by making the strategic decisions by comprehensively considering all the learning modules; whether the selected access frequency spectrum is in conflict with the authorized users is determined; if so, the collision probability is worked out; otherwise, the next step is executed; whether an environmental policy planning knowledge base is changed is determined; if so, the environmental policy planning knowledge base is updated, and the learning Q value is adjusted; the above part steps are repeatedly executed till the learning convergence. The method can improve the whole system performance, and overcome the learning blindness of the intelligent body, enhance the learning efficiency, and speed up the convergence speed.

An environmental movement detection section detects the speed of a vehicle and detects a mobile object in the vicinity of the vehicle. A collision probability prediction section predicts the probability of a prospective collision between the vehicle and the detected vicinity mobile object. On the basis of approach speeds, collision probabilities and sideward passing speeds when passing other mobile objects to sideward that have been determined from standard movements, a movement standard learning section learns relationships between approach speed, collision probability and sideward passing speed. On the basis of learning results at the movement standard learning section, a path characteristic point generation section determines a standard sideward passing speed for when passing the vicinity mobile object to sideward that corresponds with the detected approach speed and the predicted collision probability. Thus, standard mobile object states may be determined efficiently.

This invention discloses a random access method, in which access point AP can dynamically adjust the number of random access channels of the next frame according to the condition of network load reflected by the access channels and broadcast through downlink public control channels. When the request for the occurrence of group collision needs repeated access mobile terminal MT, utilizing binary index retreat algorithm, dynamically expends size of competition window, and according to down public control channel published random access channel number, successful access request number and MT service access priority level, real-time refreshes sending probability to reduce repeated collision probability. At circumstance of low or high network load, the invention can increase random access probability of success, and reduce access time delay, and provide better service Qos for high-level user.

The invention provides a vehicle driving early warning method, and relates to the field of vehicle safety. The method includes the steps that a first signal comprising driving state data of a vehicle at the current moment is sent; a second wireless signal directly sent to the vehicle from other vehicles within a preset range is received, wherein the second wireless signal comprises driving state data of other vehicles at the current moment; by the utilization of the driving state data in the second wireless signal and according to a preset condition, abnormal vehicles which are abnormal in driving are screened out from other vehicles within the preset range; only under the condition that the abnormal vehicles exist, is the probability that the vehicle collides with the abnormal vehicles calculated, and the abnormal vehicles are regarded as dangerous vehicles, when the probability that the vehicle collides with the abnormal vehicles is larger than a preset collision probability threshold value; an alarm is given to a driver of the vehicle under the condition that the dangerous vehicles exist. According to the scheme, the driver can be accurately reminded in time that the vehicle probably collides with other vehicles, the false alarm situation is avoided, and the probability of occurrence of traffic accidents is reduced.

The invention discloses an unmanned aerial vehicle autonomous formation evaluation index and model prediction control (MPC) formation control method and belongs to the technical field of flight control. According to the method, a definition relevant to unmanned aerial vehicle autonomous formation, a computing method of the collision prevention probability of unmanned aerial vehicle autonomous formation and an unmanned aerial vehicle autonomous formation evaluation index are provided, and the MPC formation control method applicable to unmanned aerial vehicles is provided. The method solves the problem how to give out the collision prevention quantitative index which should be followed by design of an autonomous formation flight control system when it is known that the unmanned aerial vehicle autonomous formation scale is M, the average expectation distance between unmanned aerial vehicles in formation is dr, and the collision probability of the whole formation is required to be smaller than Pc. The method provides a quantitative index basis for engineering design of the unmanned aerial vehicle autonomous formation control system, and the collision problem the unmanned aerial vehicles in dense formation is solved.

A collision prevention method for motor vehicles is provided, in which method obstacles in front of the vehicle are detected by an on-board positioning system, a collision probability is calculated from the position data, and one or more responses to prevent a collision are triggered as a function of the collision probability. At least one of the responses is a preparatory measure accelerating the implementation of a command, which may be output later, to decelerate the vehicle, without the preparatory measure itself having any significant decelerating effect on the vehicle.

The invention discloses a method for controlling channel access of a wireless sensor network. A base station node and each sensor node adopt a time frame structure with different lengths of time frame, so that the sensor nodes can reserve different time slots by dispatching to carry out data packet transmission, thereby not only reducing collision probability of forwarding data packets among sensor nodes in a high-density monitoring area and improving the utilization rate of wireless channel, but also effectively avoiding overhearing in the wireless sensor network and frequent status switching of a transceiver; therefore, the sensor nodes can be in dormancy status as fully as possible during idle transmission so as to greatly reduce energy consumption under the high-loading network condition and have good energy efficiency. A path reserve mechanism can reserve a multi-hop time slot in advance along data packet forwarding direction in time slot reservation phase, according to the time frame synchronizing characteristics of the sensor nodes on a forwarding path, thereby effectively avoiding end-to-end transmission delay of single data packet caused by intermittent transmission of data packets on the forwarding path.

The invention discloses a road intersection anti-collision early warning method, road-side equipment and an anti-collision system based on vehicle infrastructure integration technology. According to the road intersection anti-collision early warning method, GPS information which is transmitted by each vehicle through specific on-vehicle equipment is received by the road-side equipment arranged at a road intersection, and furthermore collision predication analysis is performed on the data of the GPS information, thereby generating early-warning information. Furthermore the early-warning information is forwarded to the vehicles with potential collision risks. Finally after the on-vehicle equipment receives the early-warning information, the on-vehicle responds to the early-warning information, thereby reducing collision probability between vehicles in the ramp and the main road of the intersection, and furthermore greatly improving vehicle driving safety on condition of high-speed driving or blind area at the intersection.

The invention discloses a vehicle collision prediction method based on vehicle distance probability distribution under a highway model. The method includes the steps of a vehicle periodically (under 10Hz) broadcasts current motion statuses Beacons (speed, acceleration and GPS); the density of vehicles in the surrounding environment is dynamically calculated to build a vehicle distance distribution probability model; a minimum safety distance required to avoid collision when two adjacent vehicles emergently brake is dynamically calculated according the motion status of one vehicle and the motion status of the adjacent vehicle ahead; the collision probability (the probability for the vehicle distance being smaller than the minimum safety distance) of the two adjacent vehicles is calculated according to vehicle distance probability distribution; a multi-vehicle collision Markov chain and a state transition matrix are established, and expectation for the number of vehicle collisions on the whole section at certain time is estimated. The method is high in innovation level and extensibility; the defects of poor GPS data precision and instability in the current vehicle-location-based collision prediction algorithm are well made up; the method plays an excellent role especially in GPS satellite signal blind areas and has promising application prospect.

Provided are a radio transmission device and a radio transmission method, which prevent the deterioration of a preamble detecting performance while reducing the collision probability of a RACH. In this radio transmission device, a Signature table storage unit (103) divides the magnitudes of transmission loss levels into individual levels corresponding to the distances from a base station, to cause CAZAC series and circulation shift quantities to correspond to each other at the individual levels, and is provided with a table containing a plurality of Signatures created from the CAZAC series and the circulation shift quantities caused to correspond to each other. A Signature selecting unit (104) selects one of the corresponding Signatures at random from the Signature table storage unit (103), on the basis of the magnitude of the transmission loss level outputted from a transmission loss level deciding unit (102). A RACH signal generating unit (105) generates the RACH signal with the Signature selected.