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480results about How to "Reliable data transmission" patented technology

Avionics system suitable for multi-purpose unmanned aircraft

The invention discloses an avionics system suitable for a multi-purpose unmanned aircraft. A 1553B dual-redundancy bus framework is adopted in the avionics system. The avionics system consists of a main processor unit, a universal interface unit, a 1553B bus, a mass memory, an airborne monitoring terminal, a task load, an execution mechanism and a sensor assembly. The devices have the connection relationships that: the main processor unit, the universal interface unit, the mass memory, the airborne monitoring terminal and the task load are connected with the 1553B bus through a 1553B special electric connector, and the 1553B special electric connector serving as a bus module connects all the devices attached to the bus together; a steering engine controller is connected with the universalinterface unit through an RS422 interface; and the sensor assembly is connected to the universal interface unit through interfaces of serial RS422/RS232/RS485, an ARINC429 bus, a CAN, analogue AD/DA and discrete DIO and the like. The avionics system has the characteristics of strong multi-task expandability, multi-redundancy high reliability, rich data interfaces and strong calculation and processing capabilities, and can well meet the application requirement of 'one platform and multiple purposes' of the unmanned aircraft.

Self-upgrade method for equipment in remote online monitoring system

The invention belongs to the field of wireless communication, and particularly relates to a self-upgrade method for equipment in a remote online monitoring system. The method is characterized in that: each piece of terminal equipment performs self-upgrade and self-maintenance through the remote online monitoring system consisting of a terminal table tool, a data acquisition unit and a background server based on a GPRS (General Packet Radio Service). The method mainly comprises the following steps that: the background server manages an application program and version information; the data acquisition unit periodically inquires a version log and downloads a new version program; the data acquisition unit realizes self-upgrade and upgrades the terminal table tool; and after the new version program is updated successfully, skipping is performed and an old version program is still kept for later use. In the method, the GPRS, storage space management, a file sub-package mechanism, a transmission response mechanism, a mode for continuous transmission at break-points and an IAP (Internet Access Provider) program programming mode are combined, and the accuracy and reliability of data transmission are ensured; and under the condition of not influencing normal use of a user, the equipment upgrading and maintaining problems of large quantity and wide distribution are solved quickly and efficiently.

System and method for remote monitoring elevator base on wireless network

The invention discloses an elevator remote monitor system and method based on wireless network. The system includes: an elevator data field collection device independent with an elevator control system, a monitor platform and a monitor terminal, the elevator data field collection device is composed of a carriage top data collection device and a control board data collector which are communicated with each other. The method includes: the monitor terminal sends a request to the monitor platform for acquiring the elevator data; the monitor platform sends the request to the elevator data field collection device through the wireless communication network; the elevator data field collection device sends the elevator field data to the monitor platform through the wireless communication network; the monitor platform sends data to the monitor terminal through internet; when the elevator breaks down, the monitor platform sends data to the monitor terminal and the hand-held or vehicle-mounted interface device. The field data of the elevator can be directly acquired on internet according to the invention, thereby the remote monitor and management of the elevator are realized, without the limitation of the field wiring and elevator space position.
Owner:建研机械检验检测(北京)有限公司 +2

Embedded satellite-borne fault-tolerant temperature control system and verification method thereof

The invention discloses an embedded satellite-borne fault-tolerant temperature control system and a verification method thereof. The system comprises a satellite management computer, an on-satellite temperature control system and a ground monitoring and fault injection computer; the on-satellite temperature control system comprises a temperature control calculation host machine, a temperature control calculation standby machine and an environmental simulation computer; and the temperature control calculation host machine and the temperature control calculation standby machine are temperature control computers. The verification method comprises the following steps of: 1, initializing a file allocation; 2, initializing the system; 3, beginning simulation; 4, injecting and executing a fault; 5, processing redundant fault tolerance; 6, monitoring the ground and evaluating the fault; and 7, evaluating a fault model and a redundancy strategy of the temperature control system. The fault injection and the verification process of the whole running stage of the real satellite-borne temperature control system are completely realized; and the method is simple, convenient and reliable, and greatly reduces the test time and expense for the practical system.

Sensor device, server node, sensor network system, method of establishing communication path, control program, and storage medium

For the purpose of allowing a sensor device (10) to carry out wireless communication with a server node (11), the sensor device (10) makes an inquiry about the server node (11) connectable to the sensor device (10) (S12). The server node (11) responds to the sensor device (10) (S13). The sensor device (10) transmits a result of the inquiry as a candidate list (S15). The server node (11) transfers the candidate list to a top node (S16). The top node receives key information and selection information selected from the candidate list, and transmits the key information and the selection information to the server node (11) selected (S19). The server node (11) transfers to the sensor device (10) the selection information, the key information, and a building ID and a room ID of the server node (11). The sensor device (10) determines whether the key information received agrees with sensor device key information (S20). When the key information agrees with the sensor device key information, the sensor device (10) notifies, to the server node (11), the agreement and an individual ID of the sensor device (10), and stores the building ID and the room ID (S21). This makes it possible to provide a sensor network system in which a communication path is safely and reliably established even when a different network exists in a communication area and a method of establishing the communication path.

ZigBee-based quadrocopter farmland positioning system

The invention provides a ZigBee-based quadrocopter farmland positioning system which comprises a plurality of known positions, ZigBee beacon nodes at the same height, and to-be-positioned quadrocopter nodes composed of the quadrocopter and ZigBee nodes, and also a positioning method which comprises the steps of selecting four beacon nodes strongest in wireless signal intensity when the quadrocopter flies over the farmland, calculating the spatial distance between the node of the quadrocopter and each beacon node through the intensity of a received wireless signal, mapping the spatial distances into horizontal distances between the node of the quadrocopter and the beacon nodes within the horizontal plane, combining every three beacon nodes to form a triangular positioning subregion and forming 4 subregions in total, for each subregion, calculating the relative coordinates of the quadrocopter by a trilateral positioning method, next, calculating the center of mass of a quadrangle formed by the four pairs of relative coordinates by a center-of-mass method, and then taking the coordinates of the center of mass as the final position coordinates of the node of the quadrocopter. The ZigBee-based quadrocopter farmland positioning system is capable of realizing low-cost, high-precision and fast-positioned regional operation in the farmland.

Multichannel cooperative data transmission method and system

The invention discloses a multichannel cooperative data transmission method and system. The method of the invention comprises the following steps: a sender sends a cooperative request-to-send (CRTS) packet carrying a data channel number to a receiver through a first control channel; after the receiver receives the CRTS packet, if the acquired data channel is judged to be usable, the receiver returns a conditional clear-to-send (CCTS) packet carrying the highest channel rate between the receiver and the sender to the sender; a candidate cooperative node intercepts the CRTS packet and the CCTS packet, and if the acquired data channel is judged to be usable and the cooperation condition is met, the candidate cooperative node sends a high (HI) packet according to access time delay; if the receiver only receives the HI packet, the receiver sends a relay acknowledgement (RACK) packet on the first control channel to disclose the cooperative node; if the sender receives the RACK packet, the sender sends a data packet to the receiver through the cooperative node; and after the receiver successfully receives the data packet, the receiver returns an acknowledgement packet through a second control channel. The invention can be used to realize efficient and reliable data transmission.

Intelligent monitoring system based on wireless sensor network technology

The invention provides an intelligent monitoring system based on a wireless sensor network technology. The intelligent monitoring system comprises monitoring nodes, gateway nodes, a service platform and access terminals, wherein the gateway nodes are in communication connection with the monitoring nodes through a Zigbee wireless network, and used for controlling the monitoring nodes; the service platform is in communication connection with the gateway nodes through a TCP/IP-based network, and used for summarizing data uploaded by the gateway nodes, storing, analyzing, adding up and processing the data, and sending control instructions to the corresponding monitoring nodes through the gateway nodes; the access terminals are in communication connection with the service platform, and used for accessing the service platform and controlling the corresponding gateway nodes and/or the monitoring nodes through the service platform. Compared with the prior art, the intelligent monitoring system provided by the invention can be applicable to various application environments, saves a large number of cables, and is convenient in system layout, simple in networking, and reliable in data transmitting; the reusability of the system is enhanced; the maintenance cost is reduced; the popularization and application of the technology are facilitated.

Multipath TCP (transmission control protocol) congestion control method based on continuous message marks

The invention provides a multipath TCP (transmission control protocol) congestion control method based on continuous message marks. The multipath TCP congestion control method based on the continuous message marks comprises the following steps of adding congestion marks on outputted messages by using an exchanger when a buffer queue length is greater than a mark threshold value K; confirming message feedback congestion marks by using a receiver server; receiving confirmed messages and confirming a message matrix MTi by using a transmitter server according to mark updating; calculating the sum of variable quantities of the matrix in a time bucket T; calculating a congestion factor alpha if the sum of the variable quantities of the matrix in the time bucket T is greater than a congestion threshold value theta; proportionally reducing congestion windows according to the alpha under the condition that the alpha is smaller than or equal to 1/2; transmitting mark locations of congestion window reduction of the messages; and increasing the congestion windows according to a coupled growing algorithm if the value in the specification is not greater than theta or the confirmed messages do not have congestion marks. Congestion state information of paths can be accurately fed back to a transmitter within an RTT (round-trip time), the congestion windows are reduced in a restraint manner proportionally, various links are utilized sufficiently, implementation of multipath transmission is guaranteed, and the multipath TCP congestion control method is suitable for a data center network of a multipath framework.

Multi-station RF thermometer and alarm system

InactiveUS6937148B2Maximize transmission range and detection sensitivityReduce power consumptionThermometer detailsFire alarmsData transmissionEnvironmental noise
A multi-station RF thermometer and alarm system measures temperatures and/or percent relative humidity at remote locations by RF weather stations, and displays received temperature and/or other weather data telemetry on a multi-station base station that provides out-of-bounds alarm signal indications whenever temperatures are outside of user-selectable minimum and maximum values. Randomized transmission times in one embodiment and two-phase unique transmission schedules in another lessen the possibility of on-going collisions between two or more transmitters contending for the base station at the same time. Redundant data transmission lessens the possibility of environmental noise interference. The redundant data, transmitted at random times in one embodiment, includes a unique channel ID code, house-keeping data, the current temperature and/or time-to-next-transmission data, and in another embodiment, transmitted at uniquely prescheduled times of two-phase transmission schedules, includes station location ID and transmission schedule phase. The weather parameter sensing transmitters operate at a low duty cycle with low peak current consumption resulting in long battery life. The multi-station base station may be AC- or battery-powered. Channel and station ID switches are provided on the remote temperature sensing transmitters and on the multi-station base station in one embodiment and a station ID number selection switch is provided in another transmitter embodiment.

Power distribution network line fault on-line monitoring and positioning system and communication method

The invention discloses a power distribution network line fault on-line monitoring and positioning system. The power distribution network line fault on-line monitoring and positioning system comprises a line fault indicator, a wireless acquisition device, a wireless ad hoc network and a monitoring main station, wherein the wireless acquisition device is in wireless communication with the monitoring main station through the wireless ad hoc network, the wireless ad hoc network comprises a central node and multiple sensing nodes. The central node and the multiple sensing nodes are connected in a wireless communication mode, and the multiple sensing nodes are connected in the wireless communication mode. The invention further discloses a communication method adopted by the power distribution network line fault on-line monitoring and positioning system. A networking method of the wireless ad hoc network comprises the following steps of initializing node electrification, starting to perform networking, finding neighbors and measuring field intensity, collecting the field intensity, performing route planning and configuration and performing normal work. By means of the system and the communication method, the power distribution network line fault on-line monitoring and positioning are performed, the networking can be performed quickly, a structure is flexible, data transmission is reliable, received data are complete, wireless communication signal dead zones do not exist, only one-time investment is required, operation expense is not required, and the operation cost is reduced.

Public bicycle rental management method and system based on wireless management

The invention provides a public bicycle rental management method and a public bicycle rental management system based on wireless management, which can solve the limitation of the existing pile-locking method based on wired networking, and greatly save land use cost and construction management cost. The public bicycle rental management method comprises the steps that: a communication module of a bicycle in a parking lot region establishes ad-hoc network wireless connection with a rental terminal through a ZigBee protocol; a card reader of the bicycle is used for reading bicycle renting and returning identity and generating bicycle renting and returning information, sending the bicycle renting and returning information to the rental terminal through the wireless connection, and receiving permission information from the rental terminal to complete renting and returning operations; and the rental terminal obtains position information of the bicycle through intensity variation of a ZigBee wireless signal, judges whether the bicycle leaves the parking lot region illegally according to the bicycle renting and returning information and the position information, and carries out alarm processing if the bicycle leaves the parking lot region illegally.
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