584 results about "Area coverage" patented technology

A cellular wireless packet data communication system containing transmit-only endpoint devices which transmit to receive-only base stations. The system is configured to allow for large area coverage (e.g., a metropolitan area) with far fewer number base stations than are required with conventional two-way cellular systems. The base station coverage areas are configured to overlap, allowing for reception of packets at multiple base stations. A data concentrator resolves redundantly received messages. The network is configurable as a WAN, a LAN, or a combination of the two. Novel modulation techniques (e.g., a 16QAM submodulation together with a 7FSK modulation) are used such that low cost components can be used in the transmitters and receivers while achieving outstanding probability of success performance. The endpoint devices are battery operated and accordingly, are designed for low power consumption and multi-year battery life. The system is used in a variety of applications including remote monitoring and mobile communications.

A two-dimensional focal plane array (FPA) is divided into sub-arrays of rows and columns of pixels, each sub-array being responsive to light energy from a target object which has been separated by a spectral filter or other spectrum dividing element into a predetermined number of spectral bands. There is preferably one sub-array on the FPA for each predetermined spectral band. Each sub-array has its own read out channel to allow parallel and simultaneous readout of all sub-arrays of the array. The scene is scanned onto the array for simultaneous imaging of the terrain in many spectral bands. Time Delay and Integrate (TDI) techniques are used as a clocking mechanism within the sub-arrays to increase the signal to noise ratio (SNR) of the detected image. Additionally, the TDI length (i.e., number of rows of integration during the exposure) within each sub-array is adjustable to optimize and normalize the response of the photosensitive substrate to each spectral band. The array provides for parallel and simultaneous readout of each sub-array to increase the collection rate of the spectral imagery. All of these features serve to provide a substantial improvement in the area coverage of a hyperspectral imaging system while at the same time increasing the SNR of the detected spectral image.

There is therefore provided, in accordance with a preferred embodiment of the present invention, a robotic system for systematically moving about an area to be covered. The system includes at least one boundary marker (48) located along the outer edge of the area to be covered, a robot (40) with a navigation system (41) and a sensor unit (43). The navigation system (41) navigates the robot (40) in generally straight, parallel lines from an initial location and turns the robot (40) when the robot (40) encounters one of the boundary markers (48), thereby to systematically move about the area to be covered. The sensor unit (43) senses proximity to one of the at least one boundary marker (48).

The invention relates to a coverage self-optimization method of a cellular mobile communication system, and is used for solving the problems of poor coverage, polluted pilot frequency and cross-area coverage. The method comprises the following steps of: measuring and reporting respective reference signal received power (RSRP) and respective signal-to-interference plus noise ratio (SINR) parameter values to a base station by each user; collecting the measurement parameter values reported by all users in a cell by the base station; judging whether the current network is in accordance with any one trigger condition of the three coverage problems; triggering a coverage self-optimization process based on dynamic adjustment on a lower dip angle of an antenna if the current network is in accordance with the condition and then adjusting the lower dip angle according to a preset scheme to solve the coverage problem; continuously adjusting an antenna azimuth angle and wave beam width or performing down-regulation on transmission power of the base station according to specific scenes and user types if the coverage requirement cannot be met within the adjustable ranges of the lower dip angle; and entering a coverage and capacity self-optimization process if the coverage problem cannot be solved by the measures. According to the method, each cell periodically initiates coverage liberalization operation for many times according to the steps so as to save manpower and material resources required by manual optimization and reduce the maintenance cost and the expenditure.

The different illustrative embodiments provide a system for autonomous machine management comprising a number of autonomous machines, a number of nodes, a performance estimation module, and a navigation system. The number of autonomous machines is configured to perform area coverage tasks in a worksite. The number of nodes is configured to define a number of worksite areas for the worksite. The performance estimation module is executed by a processor unit and configured to calculate a percentage of work completed in the number of worksite areas. The navigation system is configured to operate an autonomous machine to perform the area coverage tasks and move between the number of worksite areas.

A variety of open-air noise cancellation systems are disclosed. The systems are configured to suit the needs of the particular application, for example, an open-air sound wall installation, an open-air enclosure for a quiet area, or a window/door treatment application. A particular system may a digital-based processing architecture having a digital power amplifier that shares a common circuit board. The processing architecture receives noise signals, processes out-of-phase noise cancellation signals in response to the noise signals, and generates out-of-phase sound waves that effectively cancel low frequency components of the noise signal. One system variation utilizes passive sound absorbing blades or shutters to reduce high frequency components of the noise signal. The blades can be installed as a door or window shutter mechanism.

The invention relates to GSM network positioning technical field and provides a GSM network consumer positioning method based on signal receiving strength information fingerprint, comprising following steps: step 1 establishing information fingerprint data-base in a plurality of acquisition points in a certain area coverage; step 2 intercepting the report of the consumer to the network when talking, extracting the signal receiving strength in the customer service cell and the adjacent cell; step 3 comparing the signal receiving strength and the information fingerprint errors in the information fingerprint database acquisition points, therefore, the consumer position is the geographic position where the information fingerprint error is minimum in the acquisition point. The positioning method does not change prior GSM system network structure and the consumer terminal hardware condition with low cost and positioning accuracy error less than 30 m and is suitable for positioning indoor/outdoor. The density of the acquisition points is flexibly adjusted based on the consumer actual positioning requirements.

The different illustrative embodiments provide a method for generating an area coverage path plan using sector decomposition. A starting point is identified on a worksite map having a number of landmarks. A first landmark in the number of landmarks is identified. A path is generated around the first landmark until an obstacle is detected. In response to detecting the obstacle, the path is made linear to a next landmark. The path is generated around the next landmark.

The different illustrative embodiments provide a system for autonomous machine management comprising a number of autonomous machines, a number of boundaries, a conditional behavior module, and a navigation system. The number of autonomous machines is configured to perform area coverage tasks in a worksite. The number of nodes is configured to define a number of worksite areas for the worksite. The conditional behavior module is executed by a processor unit and configured to determine whether a number of conditions is met for the number of worksite areas. The navigation system is configured to operate an autonomous machine to perform the area coverage tasks and move between the number of worksite areas when the number of conditions is met.

The invention provides an approach for automatic and dynamic mapping of zone boundaries for position-determination systems. The system of the present invention utilizes beacons (“position determining devices”) to identify the boundaries and limits of device area coverage (“zone”) for tracking objects with a position-determination system. Beacons, used both to identify zone boundaries and to tag assets to be tracked, are distributed within the zone. The beacon locations are then detected and displayed in the visualization application. Three or more beacons may be linked together, either manually or automatically, to establish a detection zone. Using beacons to establish detection zone boundaries eliminates guesswork and its associated errors, and produces a zone boundary that is actually valid. In an improvement over present systems, greater accuracy is assured using zone-defining beacons, because if a beacon is unintentionally placed in an area unavailable to the position-determination system, that beacon will not appear in the visualization application display, and thus will not be available to create an incorrect zone representation.

A robust method for determining the boundaries of cells and the associated reliability of the RF coverage within these boundaries is presented. The invention accurately determines the average range from the base station to the cell edge from RF signal strength measurements with a linear regression approach. The accuracy of this estimate is quantified both as a range uncertainty (e.g. +/-100 meters) and as a cell coverage reliability (i.e. area/edge) through 1) simulation, 2) analysis of real data, and 3) theoretical analysis. It is shown that if the estimate of the cell radius meets the desired accuracy, then the corresponding estimates of coverage reliability (both area and edge) are more than sufficiently accurate. It is recommended that radio survey analyses incorporate this test as part of the coverage validation process.

A peer-to-peer cache architecture stores peer address certificates in different cache segments according to the number of IDs being stored and their relative distance in the peer name space. The cache instantiates regions of decreased range and increased granularity as additional information from close peers is learned. In a large peer cloud where the number of instantiated IDs is not known, each succeeding cache region covers one tenth of the preceding cache region. For peers with multiple IDs registered locally, the segmented cache of the present invention combines overlapping segments of the same granularity to eliminate the duplication of information that would otherwise occur. A cache tree, an instantiated segment tree, and an uninstantiated segment tree are arranged in red-black trees to simplify the search and proper placement and instantiation of information.

A full width array CCD sensor is incorporated in the media path to monitor fused pages by calculating area coverage from multiple engines in a Tightly Integrated Parallel Process (TIPP) architecture. With knowledge of the area coverage differences between print engines for a given pixel count to the ROS, a relative density difference of each engine is determined. Based on the determined relative density difference, an adjustment is calculated and applied to the engine with the largest error to match the area coverage(s) of the other engine(s).

An image processing system for predicting ovulation using a test channel for collecting saliva sample and a miniature camera for capturing the image of the saliva at dried state for analyzing the crystalline patterns for ovulation prediction. A rotary bristle element is attached to the drive head and a notch-like test channel traverses the width of the drive head. A conductivity sensor is mounted on a wall of the test channel for detecting filling and drying of the saliva sample. An algorithm in the microprocessor analyzes the image of the dried saliva and calculates the characteristic line length of line segments of connected saliva dots. A ferning index is also defined and calculated based on the percentage of area coverage of line segments which are exceeding the threshold line length. Trend curves are established based on the daily saliva analysis in a woman's menstrual cycle for predicting days from the ovulation.

A method for reduction of differential gloss as found in halftone image hardcopy prints. The method comprises selecting either a single halftone or employing two halftones: a first halftone having a high apparent gloss characteristic; and a second halftone having a low apparent gloss characteristic. A determination is then made of which areas of the halftone image correspond to potentially high gloss and low gloss regions under normal printing conditions. An overlay of clear toner is applied to the hardcopy print of the halftone image. In one approach a single halftone is employed to control the physical area coverage of the applied clear toner layer so as to adjust the local gloss across for the determined regions and thereby balance the evenness of gloss across the entire hardcopy print of the halftone image. Greater physical area coverage is provided as controlled by the single halftone in low gloss regions, and corresponding less physical area coverage is provided in the low gloss regions. In a further approach two halftones are employed. The first halftone is directed to those portions of the overlaid clear toner determined as corresponding to potentially low gloss regions of the halftone image, and the second halftone is directed to those portions of the clear toner layer determined as overlaying potentially high gloss regions of the halftone image.

Method of computing a convex hull in a predetermined color space, comprising determining a print attribute value range pertaining to a reference print attribute value, selecting base NP (Neugebauer Primary) area coverages, comprising area coverages of single NPs and combined NPs, having print attribute values in the print attribute value range, printing and measuring patches corresponding to the base NP area coverages, computing linear combinations of the base NP area coverages, and assigning one of the base NP area coverage or the linear combination of base NP area coverages to the corresponding color, depending on which is closest to the reference print attribute value.

A flooring system comprising a plurality of electrode pairs in contact with a metaplastic composite material. The metaplastic material is such that it locally conducts electrical current in an area where any load is applied to the metaplastic. An electric potential is applied to one or more interdigitated electrodes located at a face of the metaplastic material in line with applied loads. Larger area coverage can be obtained either by pre-installing a subsurface layer comprising of an array of interdigitated electrodes and their trace line outputs and then covering this layer with a tiling of metaplastic material sheets that is in direct contact with the array of interdigitated electrodes, or, by directly attaching one or more interdigitated electrodes and their output trace lines to an individual sections of metaplastic material and electrically interconnecting their outputs. By applying a sufficient number of interdigitated electrodes and sheets of the metaplastic material and monitoring the electrical current flowing in each interdigitated electrode so placed, it can be determined whether and where loads are being applied to the PCC flooring material and the approximate size and shape of the load.

The invention discloses a method which determines the strong covering area coverage of a base station wireless field. The invention comprises the steps: location points which are corresponding to the latitudes and longitudes of all the base stations are reflected to be a whole base station point set on a plane; the whole base station point set is processed to be subdivision triangulation lattices; the circle center positions of circumcircles of the triangle, which contain the same base station point in the subdivision triangulation lattices, are determined and regions formed by the circle centers being sequentially connected with each other are determined to be a Thiessen polygon region of the base station; the overlap region of the Thiessen polygon region of the base station and the initial circle coverage region is determined and the scope of the overlap region is determined to be the scope of the strong covering area coverage of the base station wireless field. At the same time, the invention also discloses a device which determines the strong covering area coverage of the base station wireless field. By utilizing the invention, the factors of landform and physiognomy are not needed to be considered; the strong covering area coverage of the base station wireless field or a community can be simply and conveniently and fast determined.

The invention discloses a method for improving soft-frequency reuse in an OFDM (Orthogonal Frequency Division Multiplex) system. The method comprises the following operating steps: dividing main and auxiliary frequency channels for each cell according to the cell priority level in turn; adjusting the central area coverage of the current cell; carrying out the power optimization according to the communication target value of subscribers. By taking the relation between the quantities of main and auxiliary sub-carriers and the service load intensity of the central area and the edge area of the cell as a parameter, when the service distribution in the cell is not uniform, the method can adjust the central area coverage of the current cell and compromise between the main sub-carrier orthogonality of a neighbor cell and the entire frequency resource utilization rate of the cell, so as to improve the operability and availability of the soft-frequency reuse. The disturbance of the central area of the cell to the edge area thereof can be reduced by setting a communication target value for each subscriber terminal and taking the corresponding power control so that the edge throughout and total throughout of the cell can be increased on the basis that the quality of subscriber services is guaranteed.

The invention discloses a random access method in a wireless network and user equipment. The random access method comprises the following steps: obtaining an estimator of distance from UE (user equipment) to a base station; determining the random access time advance of the UE according to the estimator; when the random access is initiated, enabling the UE to send a random access preamble code to the base station according to determined time lead; and performing random access process. According to the scheme, the random access under a big-area coverage scene can be effectively realized, the operation is simple and reliable, small system bandwidth is occupied, and the resource use ratio is higher.