36results about How to "Achieve seamless coverage" patented technology

The invention relates to an automatic license plate identification system at an urban checkpoint, which belongs to the field of monitoring and comprises a coil assembly, a vehicle detection module, a license plate identification module, a front-end module and a network transmission module, wherein the coil assembly is connected to the vehicle detection module, and coils generate a pulse signal when a vehicle passes through the urban checkpoint; the vehicle detection module detects the coils and transmits the received pulse signal to the license plate identification module; the license plate identification module captures a video image transmitted by the front-end module when the license plate identification module receives the pulse signal, finishes the entire video image processing process of the identification of a license plate, and uploads a processing result by a network; the front-end module carries out synchronous exposure, synchronous supplemental lighting and shooting on a camera under the control of a vehicle identification module and transmits the video image to the license plate identification module; and the network transmission module uploads the data of the license plate and the vehicle to a data centre. The system integrates most of the functions in the candid identification of the license plate at the checkpoint by adopting integrated design, reduces the system maintenance difficulty caused by the complexity of the system greatly, enhances the entire stability and reliability of the system, and lowers the maintenance cost of the system.

The invention relates to a vehicular integrated dewatering system, which comprises a bearing vehicle, dewatering equipment and auxiliary corollary equipment. The dewatering equipment and the auxiliary corollary equipment are mounted on the bearing vehicle and flexibly move along with the same. The dewatering equipment is used for material filter-pressing and dewatering operations on the bearing vehicle. The vehicular integrated dewatering system has the advantages that the integrated system is complete in function, wide in application and capable of flexibly moving to realize onsite dewatering quantity reduction treatment of scattered industrial and agriculture waste residue, waste residue transport cost is multiply reduced, the equipment can be used for waste residue treatment and collection of various waste residue discharge sources simultaneously, and vehicular integrated dewatering system can be used for dewatering waste residue in a fluid, semifluid and solid state without depending on external environment conditions and can be operated normally in various operational environments. Various scattered resources can be fully collected to create conditions for subsequent industrial, massive and recycling utilization, and social environmental protection can be promoted while resource utilization rate can be increased.

The invention discloses a communication method between a low-orbit satellite and a ground receiving station. It includes the following steps: the LEO satellite determines whether its current positionis in an area capable of direct communication with a ground receiving station, if located in an area capable of direct communication with a ground receiving station, the LEO satellite communicates directly with the ground receiving station, if located in an area that is not capable of direct communication with a ground receiving station, the LEO satellite chooses a high-orbit satellite which can communicate directly with both itself and the ground receiving station as a relay station, and establishes communication with the high-orbit satellite, and the high-orbit satellite which serves as therelay station relays the communication data between the low-orbit satellite and the ground receiving station. The invention can ensure that the whole orbit of the low-orbit satellite and the ground receiving station always keep communication, and realize the seamless coverage of the low-orbit satellite.

The invention discloses a union positioning method and a union positioning system based on a Beidou-2 satellite and a Chinese ground digital television. The method comprises the following steps of: 1, detecting a satellite signal of a Beidou-2 navigation system on a terminal receiver and determining signal strength of the satellite signal; 2, detecting a television signal in a single frequency network of the Chinese ground digital television on the terminal receiver and determining the signal strength of the television signal; 3, selecting a positioning mode according to detection results anddetermination results; 4, extracting positioning parameters from the received signals; and 5, in the selected positioning mode, acquiring a position where a target is placed according to the positioning parameters and auxiliary positioning information, and providing a time service. In the invention, by combining the Beidou-2 navigation system and the single frequency network of the Chinese grounddigital television for positioning, the selection of optimal constellation is facilitated; the positioning precision of the system is improved; by switching of various positioning modes, the flexibility and the impact resistance of the system are enhanced; moreover, seamless coverage of a positioning area is realized, and the effectiveness of the system is promoted.

The invention discloses a low-orbit satellite communication method. It includes the following steps: the LEO satellite determines whether its current position is in an area capable of direct communication with a ground receiving station, if located in an area capable of direct communication with a ground receiving station, the LEO satellite communicates directly with the ground receiving station,if located in an area that is not capable of direct communication with a ground receiving station, the LEO satellite chooses a high-orbit satellite which can communicate directly with both itself andthe ground receiving station as a relay station, and establishes communication with the high-orbit satellite, and the high-orbit satellite which serves as the relay station relays the communication data between the low-orbit satellite and the ground receiving station. The invention can ensure that the whole orbit of the low-orbit satellite and the ground receiving station always keep communication, and realize the seamless coverage of the low-orbit satellite.

The disclosed circuit is composed of main control circuit, ON-OFF control circuit, electrical level conversion circuit, channels switching circuit, input and output interface circuits, and watchdog of hardware circuit. Through ON-OFF control circuit, channels switching circuit, electrical level conversion circuit, and input and output interface circuits in sequence, the main control circuit is connected to hypogyny device electrically. Connected to ON-OFF control circuit and interface of MODEM communication port, the main control circuit controls connection to GPRS IP MODEM. Output of watchdog circuit is connected to input end of main control circuit. The invention makes LT8031 realize seamless coverage without need of fixing IP and host by using advanced GPRS technique. Advantages are: minimum flow charging, providing simpler network interface for users, flexible to select interfaces through jumper, and all sided optimization making development easier etc.

The invention discloses a wireless WiFi multimedia broadcasting system and a wireless WiFi multimedia broadcasting method. A carrier-class WiFi device is used for establishing a coverage system in a limited range; a sending end consists of 7 parts, namely, a program source collecting part, an on-demand program stream multiplexing part, a program stream resynthesizing processing part, a data streams sending and transmitting part, a mobile client receiving part, an adaptive feedback part and a video playing part. A multi-program TS stream is multiplexed on demand into a plurality of data streams in forms of program IP packets, and a network synthesis controller capable of receiving and processing multiple channels of stream media at the same time is constructed, so that the data streams can be sent in a broadcasting manner to achieve simultaneous reception of a large batch of smart mobile phone terminals and simultaneous playing of multiple programs. By a wireless WiFi IP broadcasting technology based on digital TV and other multimedia information, in relatively large service scenes (terminal buildings, meeting places, waiting halls, mobile compartments, residential areas, tourist areas and the like), simultaneous reception of more mobile phones (more than 32) and other smart terminals can be achieved during IP live broadcasting of the digital TV and the other multimedia information.

The invention discloses an automatic attendance checking method based on NFC (Near Field Communication), which is applied to an electronic class board with an NFC function. The method comprises the steps of collecting attendance checking data transmitted by student equipment when the student equipment approaches through the NFC function, wherein the attendance checking data comprises student identifiers and attendance checking time points stored in the student equipment; and submitting all of the collected attendance checking data to a background server in a unified manner at the arrival of predetermined time so as to enable the background server to perform attendance checking analysis according to the attendance checking data submitted by the electronic class board. The invention also discloses an automatic attendance checking device based on NFC, an electronic class board and an automatic attendance checking system based on NFC, which can realize statistics, analysis and storage of the classroom attendance checking data.

The invention relates to a method for upgrading existing wireless communication base stations and realizing 3G seamless coverage, belonging to the technical field of communication. The construction of a 3G network consumes a large amount of resources, and if sites of the original 2G base stations or the CDMA base stations are used for directly reconstructing equipment, the investment can be greatly saved. However, because the 3G frequency is higher, if the 3G equipment is directly erected at the existing sites, blind areas which can not be covered can appear in the original sites. The invention provides a method for eliminating the blind areas, which enables a filter in the receiving front end of the existing base station to be combined with the superconducting filtering technique, thereby improving the receiving sensitivity of the base station to the maximum extent, simultaneously inhibiting in-band and out-off-band signal interference and background noise interference of 3G signals, greatly improving the signal-to-noise ratio of the receiving front end, effectively expanding the coverage area of the 3G signals, and realizing the seamless coverage of the 3G signals.

The invention provides a method for determining a carrier-to-interference ratio in multi-beam satellite communication. The method comprises the steps of determining a pointing position of a central axis of each single-beam antenna according to single-beam radiation characteristics and position information of a satellite; determining useful power received by the observer according to the pointing position of the central axis of each single-beam antenna and the angle of the observer deviating from the central axis of the beam antenna; determining the same-frequency interference power received bythe observer according to the pointing position of the central axis of each single-beam antenna and the angle of the observer deviating from the central axis of the same-frequency interference beam antenna; and determining a carrier-to-interference ratio according to the useful power and the same-frequency interference power. The carrier-to-interference ratio obtained by the method is high in precision, and an accurate basis is provided for frequency spectrum planning of a satellite communication system.

The invention discloses a passive optical network terminal authentication and authorization system, and a method thereof. The passive optical network terminal authentication and authorization system comprises a registration unit, an authentication and authorization unit and a service configuration unit, the registration unit reports the discovery information of an ONU (optical network unit) terminal device of an EPON or GPON system, obtains user card information of the terminal ONU according to the discovery information and finally reports a registration message of the EPON or GPON system; theauthentication and authorization unit receives the registration information reported by the registration unit, and compares the ONU registration information with the user fulfillment information to perform authentication and authorization on the ONU device; and the service configuration unit receives information passing authentication and authorization, performs matching according to the servicefulfillment information of a user card, and fulfills and issues the service to the ONU terminal. By adoption of the passive optical network terminal authentication and authorization system disclosed by the invention, the problems that when the user ONU terminal device is faulty, the configuration needs to be obtained again, and the user service configuration needs to be downloaded again, and aftera user moves away from the original residential cell is moved away, the original service cannot be used are solved.

The invention discloses a low-orbit satellite communication method. It includes the following steps: the LEO satellite determines whether its current position is in an area capable of direct communication with a ground receiving station, if located in an area capable of direct communication with a ground receiving station, the LEO satellite communicates directly with the ground receiving station,if located in an area that is not capable of direct communication with a ground receiving station, the LEO satellite chooses a high-orbit satellite which can communicate directly with both itself andthe ground receiving station as a relay station, and establishes communication with the high-orbit satellite, and the high-orbit satellite which serves as the relay station relays the communication data between the low-orbit satellite and the ground receiving station. The invention can ensure that the whole orbit of the low-orbit satellite and the ground receiving station always keep communication, and realize the seamless coverage of the low-orbit satellite.

The invention provides a method for determining a carrier-to-interference ratio in multi-beam satellite communication. The method comprises the steps of determining a pointing position of a central axis of each single-beam antenna according to single-beam radiation characteristics and position information of a satellite; determining useful power received by the observer according to the pointing position of the central axis of each single-beam antenna and the angle of the observer deviating from the central axis of the beam antenna; determining the same-frequency interference power received bythe observer according to the pointing position of the central axis of each single-beam antenna and the angle of the observer deviating from the central axis of the same-frequency interference beam antenna; and determining a carrier-to-interference ratio according to the useful power and the same-frequency interference power. The carrier-to-interference ratio obtained by the method is high in precision, and an accurate basis is provided for frequency spectrum planning of a satellite communication system.

The invention discloses a method for planning and designing a distributed radar multi-station detection sequence. The idea is: determine the distributed radar system and establish a reference coordinate system; determine the key monitoring area to obtain M cooperative detection area units; calculate N local radar stations The set of beam dwell times on M cooperative detection area units; according to the beam dwell time sets of N local radar stations on M cooperative detection area units, N The pulse emission time vector set of local radar stations and the pulse emission end time vector set of N local radar stations when the distributed radar system irradiates M search areas; according to the N local radar stations when the distributed radar system illuminates M search areas The pulse emission time vector set of the distributed radar system and the pulse emission end time vector set of N local radar stations when the distributed radar system irradiates M search areas are obtained, and the distributed radar multi-station detection sequence planning and design results are obtained.

The invention provides a cell PCI setting method in an LTE network. The method comprises the steps of acquiring an area with the need of PCI setting and dividing the area into a plurality of regular hexagonal cells with the same size, carrying out equidistant clustering on the area according to a preset PCI reuse distance, selecting one cluster in the area as a cell cluster and generating the graph of the cell cluster, receiving inputted available CPI and carrying out CPI setting on the graph of the cell cluster according to different criteria of mod3, and carrying out replication and translation on other clusters in the area of the set cell cluster to complete the PCI setting of the area. The invention also provides a cell PCI setting system in the LTE network, and the cell wireless network PCI setting can be quickly and efficiently completed in the LTE network.

This application proposes a three-dimensional positioning method, system and medium for use in a shaft of a subway construction site. The method includes: establishing a three-dimensional coordinate system corresponding to the area of ​​the shaft, and determining the coordinates of the ultra-wideband UWB base stations set in different layers of the shaft ;Use each UWB base station to measure the distance of the positioning tag, filter out the error data from the summarized data and discard it; divide the three-dimensional coordinate system into a plurality of equal cube grids, according to the coordinates of the selected UWB base station and the corresponding measured The distance data and the coordinates of the center point of each cube grid are used to determine the position record of the positioning label in each cube grid in turn; votes are made based on the position records of each grid to determine the conclusion coordinates of the positioning label. The method can be positioned in the three-dimensional space of the shaft as a whole, expands the area that can be positioned, and improves the accuracy of positioning.

The invention provides a network seamless covering method and system based on fast access of an 802.11 wireless terminal. The method includes the steps that a fixed AP is set in the position of a pre-access network based on the 802.11 wireless terminal; a multi-user antenna set for receiving signals transmitted based on the 802.11 wireless terminal, shielding interference signals, lowering electromagnetic noise and increasing the system throughput is arranged on the fixed AP; the fixed AP has access to a Mesh network through an MP access point in the Mesh network, and information contained in the received signals is transmitted to the Mesh network to be transmitted. By the adoption of the method and system, in a severe signal-to-noise-ratio environment, communication quality and communication efficiency are improved, the node coverage range is increased, communication blind districts are effectively reduced, the fixed AP is compatible in the Mesh network, a hybrid Mesh network is formed, all terminal equipment can be compatible, seamless coverage is achieved, and the problems that wireless equipment in an existing network is difficult in access, data transmission throughput is low, and network coverage is not complete are solved.