647results about How to "Big error" patented technology

An autonomous unmanned space flight system and planetary lander executes a discrete landing sequence including performing an initial velocity braking maneuver to remove velocity at altitude, coasting during which the planet surface is imaged and correlated to reference maps to estimate cross-track and along-track navigation errors and one or more lateral braking maneuvers are performed to reduce cross-track navigation error, and performing a terminal velocity braking maneuver(s) to reduce the along-track braking maneuver and remove the remainder of the velocity just prior to landing. A bi-propellant propulsion system provides a very high T/M ratio, at least 15:1 per nozzle. Short, high T/M divert maneuvers provide the capability to remove cross-track navigation error efficiently up to the maximum resolution of the reference maps. Short, high T/M terminal velocity braking maneuver(s) provide the capability to remove along-track navigation error to a similar resolution and remove the remaining velocity in a very short time window, approximately 3-15 seconds prior to touchdown. The propulsive efficiency frees up mass which can be allocated to a fuel to remove the unknown navigation errors, perform hazard avoidance and/or relocate the lander by flying it to another site or be allocated to additional payload.

A system and method in which the position update rate is adaptively modified, based on previous position measurements. By adjusting the update rate based on velocity predictions from two or more position fixes, a lower update rate may be used without exceeding the maximum error. Lowering the update rate reduces power consumption in the UE, providing longer battery operation. The updating method may comprise periodically repeating the velocity prediction and periodically adjusting the update rate responsive thereto. The update rate may be adjusted using additional information such as an acceleration prediction, a minimum update rate, or a preferred error. In some embodiments a model for user movement may be used to provide more accurate predictions, for example, stationary, walking, jogging, city driving, and freeway driving. The updating method may comprise receiving user input regarding the maximum position error.

Data are encoded using convolutional coding prior to storage in a nonvolatile memory array, so that errors that occur when the data are read may be corrected even where there is a large number of such errors. Coding rates of less than one increase the amount of data to be stored but allow correction of large numbers of errors.

A wireless localization technology using efficient multilateration in a wireless sensor network is disclosed. After calculating estimated distances from each of at least three reference nodes to a blind node using received signal strength of wireless signals that the at least three reference nodes received from the blind node, the estimated location of the blind node is obtained through multilateration using the calculated estimated distances. To correct error in the estimated location, the estimated distances are used, and the error correction direction and error correction distance for the estimated location are calculated by applying a largest weight to the reference node closest to the estimated location. The error of the estimated location is corrected by move the estimated location of the blind node by the calculated error correction direction and error correction distance. Calculation for the error correction is very simple and fast.

Data are encoded using convolutional coding prior to storage in a nonvolatile memory array, so that errors that occur when the data are read may be corrected even where there is a large number of such errors. Coding rates of less than one increase the amount of data to be stored but allow correction of large numbers of errors.

A method for leakage detection of underground pipeline corridor based on dynamic infrared thermal image processing. The leakage can be detected by the following steps, including: converting infrared thermal videos into infrared thermal images; obtaining the gray scale information and temperature information of internal environment of the underground pipeline corridor. The gray scale information can realize the conventional target of pipe line state identification inside the pipeline corridor, and the temperature information can be used to detect the pipe leakage.

A method and apparatus for providing ventilatory assistance to a spontaneously breathing patient An error signal (56) is computed that is the difference between a function of respiratory airflow (54) over a period of time and a target value (52). Using a servo loop, air is delivered to the patient at a pressure that is a function of the error signal, the phase of the current breathing cycle, and a loop gain that varies depending on the magnitude of the error signal. The loop gain increases with the magnitude of the error signal, and the gain is greater for error signals below a ventilation target than for error signals above the ventilation target value. The target value (52) is an alveolar ventilation that takes into account the patient's physiologic dead space.

An atomic clock having a physics package that includes a vacuum chamber cavity that holds atoms of Rb-87 under high vacuum conditions, an optical bench having a single laser light source, a local oscillator, a plurality of magnetic field coils, an antenna, at least one photo-detector and integrated control electronics. The single laser light source has a fold-retro-reflected design to create three retro-reflected optical beams that cross at 90° angles relative to one another in the vacuum chamber cavity. This design allows the single laser light source to make the required six trapping beams needed to trap and cool the atoms of Rb-87. The foregoing design makes possible atomic clocks having reduced size and power consumption and capable of maintaining an ultra-high vacuum without active pumping.

An analog input signal obtained from an analog sensor group 104A and first and second calibration voltages obtained by high-precision voltage-dividing resistors are successively selected by a multiplexer, digitally converted through an AD converter and then input to a microprocessor. The microprocessor calculates a collinear approximate coefficient based on the first and second calibration voltages in cooperation with a program memory, and corrects the digital conversion value to the analog input signal by using the approximate coefficient, thereby correcting a linear error of the conversion characteristic of the AD converter. In the calculation of the approximate coefficient, upper and lower limit check is executed on measurement values and calculation coefficients, and also plural calculation results are averaged to enhance the precision.

A power-control method base on Downlink Piloting Time Slot (DwPTS) in a mobile communication system. While a terminal is being accessed randomly, the terminal determines the transmitting signal power at Uplink Piloting Time Slot (UpPTS) for open-loop power control by using broadcast information and the measured DwPTS power. While the communications are being maintained, the base station notifies the terminal of the required receiving power, the terminal then calculates the transmitting power for open-loop power control by using the measured DwPTS power, which is taken as the reference transmission power of the uplink channel and compared with the actual transmitting power required by the base station for closed-loop power control; the difference of the comparison is in turn compared with a threshold, if the difference is larger than the threshold, sum of the reference transmission power and the threshold is used as the power to perform transmission, otherwise, the closed-loop power control command is keeping executed. By taking the advantage of the TDD mode in which the uplink and downlink transmissions are, carried out in the same conditions, the method makes full use of open-loop power control which has the merits of being simple and accurate so that complex outer-loop power control is not needed in closed-loop power control, making the RNC simpler and the system more stable. hi addition, since it is the DwPTS power that is measured in the power control, the accuracy of power control is greatly improved.

An improved biopsy kit for the collection, storage, transportation, and processing of biopsy tissue samples is disclosed. The disclosed biopsy kit consists of a typical specimen container and an improved tissue cassette with adhesively attached polyvinyl alcohol foam pads on both the base and lid portions. An excised tissue sample is sandwiched between the pads upon cassette closure, simultaneously isolating and securing the sample in its original orientation. Superior wicking, absorbency, and moisture retention rate of these polyvinyl alcohol pads allows maximum tissue fixation as well as maintains sample integrity. Once the tissue is placed by the physician at the patient's side, it remains there until the tissue is ready to be processed. This eliminates transfer errors as well as tissue loss.

A digitally-implemented pulse width modulation (PWM) signal generator forms the PWM pulse width as a rational number based on full cycles of a PWM reference clock, and offers a very high effective resolution of the PWM pulse signal that is compatible with multiphase DC-DC converters. Being totally digital allows digital error accumulation and correction to occur at the point of origin of the PWM signal, well upstream of the relatively slow voltage control feedback loop. Quantization errors are corrected before they can accumulate in the converter's DC output voltage.

The invention concerns a method for making a soundproofing panel with at least one double resonator used for example on pods enclosing aircraft turbojets. Said method is characterized in that the septum is formed by assembling a plurality of parts against one of the honeycomb cores, said parts being cut out in foil, said parts being defined to enable the shape of the septum to be more or less adapted to extensible surfaces, said parts enabling significant reduction of the cost for perforating the septum.

A method of controlling a touch panel display device, and a touch panel display device using the same, facilitate a user selection (touching) of a specific icon to improve the reliability of registering a touch event for the specific icon, thereby enabling smaller icons to be used with greater accuracy. The touch panel display device includes a touch panel exhibiting a plurality of coordinates corresponding to a screen area of the touch panel display device, the screen area including a zoom icon area; a touch panel controller for recognizing coordinates of a touch event, for storing the recognized coordinates in an internally provided memory, and for outputting a coordinates signal corresponding to the touch event by converting a value generated by the touch event into a corresponding coordinates value; a microprocessor for determining whether the coordinates value output from the touch panel controller corresponds to the zoom icon area of the screen area; a touch driver for outputting a zoom function signal corresponding to the coordinates value output from the touch panel controller; and a display for displaying a magnified icon area corresponding to the zoom icon area, if the microprocessor determines that the coordinates value output from the touch panel controller corresponds to the zoom icon area of the screen area. A method of controlling the above touch panel display device includes steps of displaying a zoom icon area on at least part of a screen made up of a plurality of coordinates; recognizing coordinates of a touch event, to determine whether the touch event corresponds to the displayed zoom icon area; and displaying, if it is determined that the touch event corresponds to the displayed zoom icon area, a magnified icon area corresponding to the zoom icon area.

Methods are disclosed for finding images from a large corpus of images that at least partially match a query image. The present method makes use of feature detectors to bundle features into local groups or bundles. These bundled features are repeatable and much more discriminative than an individual SIFT feature. Equally importantly, the bundled features provide a flexible representation that allows simple and robust geometric constraints to be efficiently enforced when querying the index.

The invention discloses a depth camera-oriented multi-view three-dimensional reconstruction method and system. The method comprises the steps of obtaining multiple pairs of images of a real scene fromdifferent angles according to a depth camera, wherein each pair of images comprises a color image and a depth image; according to a feature point detection algorithm, obtaining two-dimensional feature points and feature descriptors on the color images, calculating a confidence degree between the feature descriptors corresponding to any two color images respectively, and obtaining a feature matching relationship; according to the feature matching relationships and the corresponding depth images, obtaining corresponding three-dimensional images, reversely projecting two-dimensional feature points to a camera coordinate system, and obtaining three-dimensional points on the three-dimensional images; according to the two-dimensional feature points and the three-dimensional points, calculatingabsolute attitude of the camera; and according to the absolute attitude of the camera, mapping the three-dimensional points to the camera coordinate system, and obtaining an initial three-dimensionalmodel of the scene. By adopting the method or the system, the high-precision three-dimensional scene model can be recovered from the image sequence collected by the depth camera.

A magnetic direction sensor can detect at higher precision the magnitude and direction of a detected magnetic field. The magnetic direction sensor has a measuring section, a storage section and an operating section. The measuring section has first and second MR elements, and detects resistance values of these elements in accordance with an attitude change of the sensor and the presence or absence of a bias magnetic field to be applied through a coil in a direction orthogonal to a magnetization direction of each pinned layer in the first and second MR elements. The storage section stores fixed data invariable in response to a detected magnetic field direction, in resistance values of these elements measured by the measuring section. The operating section calculates a detected magnetic field vector from variable data of resistance values of these elements measured by the measuring section, and fixed data stored in the storage section.

The invention relates to a collaborative analysis reentry guidance method considering multiple no-fly zone constraint, which comprises the steps of 1, describing a reentry guidance problem; 2, providing an analytic solution of flight time based on a rotational globe model; 3, carrying out an analytic reentry guidance process considering multiple no-fly zone and arrival time constraint; 4, providing a multi-aircraft arrival time collaboration scheme. The method herein has the advantages that an exact analytic solution of hypersonic gliding trajectory flight time based on the rotational globe model, and a prediction error is kept less than 3% to adapt to conditions with non-constant vertical lift-drag ratio profile; the problem with collaborative flight allowing multiple hypersonic gliding aircrafts to be guided to arrive at a target at the same time in a multiple no-fly zone environment is solved on the basis of the analytic solution of three-dimensional reentry trajectory and the analytic solution of flight time; a multi-target numeric iteration plan based on online trajectory simulation considering terminal time, speed and height requirements is designed. A directional derivativeis sued to modify the quasi-newton method, and the quantity of trajectory simulations is decreased.

The invention provides a GNSS/MINS (global navigation satellite system/micro-electro-mechanical systems inertial navigation system) super-deep combination navigation method, aiming to realize super-deep combination of a GNSS and an MINS. The GNSS uses a direct location estimation method to estimate location errors, speed error and clock errors according to location and speed auxiliary information provided by an INS (inertial navigation system) to close loops; a system takes an MIMU (MINS inertial measurement unit) and a base band correlator as sensors to realize all the navigation functions in a top combinational algorithm, in other words, the algorithm takes the GNSS base band correlator as the sensor of sensitive space-time locating fields and takes the MIMU as the sensor of sensitive inertance fields to realize integral combination of the GNSS and the MINS; and by the aid of the INS, the GNSS combines multichannel information to perform vector phase discrimination and vector locating. The invention further provides super-deep combination system and device applied to the method. The method, the system and the device have the advantages of high navigation accuracy, good dynamic property, high GNSS tracking sensitivity, high GNSS anti-interference performance, wide GNSS dynamic pulling range and the like; and in theory, the dynamic range is limited by trends of the MINS, and -160dBM (decibels above one milliwatt in 600 ohms) signal tracking can be realized by the GNSS by the aid of the MINS.

A vehicle travel control system is arranged to obtain curve information as to a curve of a road ahead of the vehicle, to obtain a vehicle driving condition produced by a vehicle occupant, to obtain a curve entering degree of the vehicle into the curve on the basis of the driving condition, to obtain a vehicle speed, and to decelerate the vehicle on the basis of the curve information and the curve entering degree and the vehicle speed.

A system and method for implementing an efficient and easy to user interface for a touch screen device. A cursor may be placed by a user using simple inputs. The device operates places the cursor coarsely and refines the cursor placement upon further input from the user. Text may be selected using a gripper associated with the cursor. The user interface allows text selection without occluding the text being selected with the user's finger or the gripper. For selecting text in a multi-line block of text, a dynamic safety zone is implemented to simplify text selection for the user.

The invention discloses a method for analyzing the mechanical property of a UD-CMC (Unidirectional Ceramic Matrix Composite) under a stress oxidation environment. The method comprises the following steps: determining the crack number, which changes along with stress, of a base of the UD-CMC; determining a crack width change rule; determining influence of cracking of the base of the UD-CMC on the change of a mass weight-loss ratio lambda by considering a stress reaction according to an oxidation mechanism of the UD-CMC under an existing unstressed oxidation environment of 400 to 900 DEG C; determining a change rule of residual modulus of the UD-CMC under a stress oxidation environment by considering the situation that the base of the UD-CMC cracks; determining a change situation of residual strength of the UD-CMC under the stress oxidation environment by considering the situation that the base cracks according to a change rule of the volume fraction of the UD-CMC. According to the method for analyzing the mechanical property of the UD-CMC under the stress oxidation environment, disclosed by the invention, a relevant theoretical support is provided for analyzing the mechanical property of the UD-CMC under the stress oxidation environment.

The invention provides a method for positioning PU of cognitive radio networks. The method comprises the following steps: acquiring a plurality of detecting results on the PU based on MAC communication protocol through an idle channel capable of perceiving at least three SU of the PU within certain time slot; and based on the plurality of the detecting results in the last step, calculating and determining the position of the PU by an iterative algorithm of weighting least squares. The method has the advantage that the method acquires location algorithm-based positioning precision by utilizing a little information without basing on the location algorithm, and further improves the performance of positioning algorithm by introducing the iterative algorithm of weighting least squares. The deduction of Cramer-Rao theory performance limit and a plurality of imitations prove that the positioning error of the method is extremely similar to Cramer-Rao limit theory performance.

A method, device, and control unit for controlling an actuator in open loop, particularly for a valve, preferably for a gas-exchange valve of an internal combustion engine, having at least one control valve for opening the valve and one control valve for closing the valve, each of the control valves being capable of being driven by at least one drive pulse whose duration determines a position on the positioning travel of the valve. The valve is opened/closed in one lift and/or a plurality of partial lifts and at least one drive pulse is assigned to each lift and/or each partial lift, and the valve is assigned at least one transducer which generates a signal that discloses values of a discrete positioning travel of the valve and of an assigned time and/or of a discrete instant and of an assigned positioning travel. The method for controlling the actuator includes:

a. Starting of a drive pulse having a setpoint duration of the drive pulse for opening and/or closing the valve,

b. Generating at least one signal, and

c. Correcting the setpoint duration of the drive pulse and/or of a following drive pulse assigned to the lift and/or to a partial lift, in accordance with the signal.