274 results about "Reference function" patented technology

Systems, methods and computer program products for determining a position location estimate for a remote receiver based on one or more time-of-arrival measurements transmitted from one or more transmitters and first timing data associated with the one or more transmitters and further associated with one or more reference locations within a reference area of the remote receiver are described.

The invention belongs to the field of an electric power system and particularly relates to a substation energy efficiency evaluating method based on an entropy method and a layer analysis method. By applying the layer analysis method and the entropy method in the energy efficiency evaluation of the existing substation, the influences of subjective and objective factors on the energy efficiency evaluation of the substation are covered; and the substation energy efficiency evaluating method has a great reference function to the on-site energy efficiency evaluation of a substation and can serve as a reliable and practical evaluation method for guiding the design of the substation and for operators to conduct energy efficiency evaluation, thus filling up the blank in the substation energy efficiency evaluation technology at home and abroad and greatly improving the economic operation level of the existing substation. Simultaneously, an index system of the energy efficiency evaluation of the substation can well solve a series of practical problems in the energy efficiency evaluation of the substation, guide scientific and reasonable new-construction and energy-saving renovation projects of the substation in practical design and economic operation and ensure the safety and economical operation of the substation, thus bringing huge economic benefits.

The invention discloses a particle filtering method based on a Gaussian mixture model and variational Bayes, comprising the following steps: (1) modeling observation noise using a Gaussian mixture model, and initializing the initial state; (2) randomly generating N initial particles based on the probability density function of the initial state; (3) initializing the super parameters of the unknown parameters in the Gaussian mixture model of observation noise; (4) generating sampling particles from a chosen importance reference function; (5) updating measurement, and calculating the particle weights according to the latest observation value and a particle weight iteration formula; (7) using a variational Bayesian method to get the distribution of the unknown parameters in the Gaussian mixture model by means of loop iteration; and (7) normalizing the particle weights, and re-sampling a particle set in view of particle degradation. Through the scheme, the filtering precision and the target state estimation performance are improved effectively.

A structured prediction model learning apparatus, method, program, and recording medium maintain prediction performance with a smaller amount of memory. An auxiliary model is introduced by defining the auxiliary model parameter set θ^(k) with a log-linear model. A set Θ of auxiliary model parameter sets which minimizes the Bregman divergence between the auxiliary model and a reference function indicating the degree of pseudo accuracy is estimated by using unsupervised data. A base-model parameter set λ which minimizes an empirical risk function defined beforehand is estimated by using supervised data and the set Θ of auxiliary model parameter sets.

Calibration and reference samples with reduced cross-sectional areas encased within imaging tables or couch pads have low attenuation properties and provide patient comfort. The samples are stable and provide reproducible images without artifacts. The torso-length samples avoid positioning errors and misalignment. Sample density or mass calibration materials include calcium compounds representative of bone and calcifications, iodine compounds for contrast angiography, gadolinium compounds for MRI, and fat and tissue equivalent materials. Density corrections for variable patient scatter and imperfect image reconstructions improve quantitative measurement. Automated computer methods detect the samples and record readings on all images over the extent of the scans without operator interaction. Spatial references function as location references and enable spatial correction of device imperfections such as point spread function (PSF) or motion for improved images. Comparative analysis of backward and forward projections corrects images based on simultaneous imaging of the references of known properties.

The invention discloses a diagnosis method for a single-phase line breakage grounding complex fault type of a power distribution network based on a zero sequence voltage, and the method comprises the steps: setting a start value of the zero sequence voltage through determining a small current grounding mode; extracting voltage sampling data of each phase of N cyclic waves before a line breakage moment and N cyclic waves after a fault moment, and calculating and obtaining the phase difference relation between the phase of the fault phase voltage before the fault and the phase of the steady-state zero sequence voltage after the fault and a reference function as the criterion through the FFT and a symmetrical component algorithm; judging whether the zero sequence voltage exceeds the start value or not: carrying out the extraction if the zero sequence voltage exceeds the start value and judging whether the phase difference between the phase of the zero sequence voltage and the phase of the fault phase voltage before the fault is corresponding to a load side grounding range of the criterion or not: determining that the fault is a single line breakage and load side grounding fault if the phase difference is corresponding to the load side grounding range of the criterion, or else determining that the fault is a single line breakage and power side grounding fault. The method is good in universality, and is suitable for power distribution networks at various voltage levels, wherein the neutral points of the power distribution networks are not grounded or the power distribution networks are grounded through arc suppression coils. Moreover, the deviation angle is not affected by the voltage level.

Systems and methods for locating an object are disclosed herein. The locator system includes a plurality of reference units and a processor in communication with the reference units. The reference units are positioned about a region in which a mobile unit is located, and each reference unit includes a transceiver for transmitting and receiving a transaction-based location signal to and from the mobile unit. The processor is configured for estimating time offsets between the mobile unit and reference units and aligning the transaction-based location signals from the reference units by removing the time offsets. The processor is further configured for collectively processing data representative of the aligned location signals based on a plurality of potential locations to identify at least one of the potential locations as a likely mobile unit location.

The invention provides a non-linear software correction method of a linear frequency modulated continuous wave radar, belonging to the technical field of signal treatment and detection. The non-linear software correction method particularly comprises the following steps of: in a linear frequency modulated continuous wave radar receiver, carrying out analogue-to-digital conversion on amplified and filtered video echo receiving signals into digital signals; secondly, carrying out fractional order Fourier transform analysis on the digital echo signals; carrying out peak value search on a fractional order Fourier transform result in two dimensions of an order quantity and a transform frequency domain, wherein the fractional order and the frequency which correspond to a peak value show main and target time delay of non-linear frequency modulation; and calculating to obtain a frequency modulated non-linear parameter until the treatment process of the method can be completed. With the adoption of the method provided by the invention, the frequency modulated non-linear parameter can be obtained for establishing a non-linear correction reference function. The non-linear influence in the echo signals can be effectively removed by convolving the reference function and the radar echo signals.

The invention relates to the field of satellite navigation and radio positioning, and discloses a ground-based high-precision regional positioning navigation system and a ground-based high-precision regional positioning navigation method. The ground-based high-precision regional positioning navigation system comprises a plurality of distributed navigation base stations, a datum station and a monitoring station, wherein each navigation base station has a navigation signal broadcasting function, is equipped with transmitting and receiving antennas, and adopts a broadband variable-frequency channel design; 2) the navigation base stations and the datum station adopt a bidirectional time synchronization method to achieve time synchronization among the navigation base stations, and the datum station has a GNSS time reference function; the monitoring station has a navigation signal quality monitoring, evaluation and calibration function, and the monitoring station and the datum station can beco-locational. The invention further discloses a high-precision positioning method, which determines initial position coordinates of a receiver based on a single-difference pseudo code phase measurement value, and assists in completion of carrier ambiguity resolution and high-precision positioning. The ground-based high-precision regional positioning navigation system has the advantages of high environment adaptability, high positioning precision, high anti-interference performance, easy deployment, low cost, scalability and GNSS system cooperative work capability.

The invention introduces a shield excavation technology of a tunnel with a sharp curve on the basis of the analysis of easy occurred problems in shield construction of a metro tunnel with a sharp curve and the combination of an engineering example of a long-distance tunnel with an extremely sharp curve between districts in a Yangjiji zoo. The development of a city promotes the development of rail transit construction. Because the selection of a rail transit line is restricted by planning, buildings and structures, the shape of the rail transit line is more and more complicated. Although the line shape of the tunnel with the sharp curve is not excellent, the line shape is applied more and more frequently. Compared with the conventional shield construction technology, the shield construction technology of the tunnel with the sharp curve has certain particularity. The research on the shield construction technology of the tunnel with the sharp curve, in particular to the shield construction technology of the tunnel with the sharp curve in complex strata in Guangzhou, has a certain reference function for similar shield construction of the tunnel with the sharp curve in the future.

The invention relates to the technical field of steels for prestressed concrete articles in construction industry. 1x7 structure and 1x19 structure that is developed in later period are the steel stranded wires made of smooth, round steel wire twists. While usage, smooth, round core wires are in non-effective contact with edge wires, which is extremely liable to production of slide movement and retraction of edge of the core wires, lessens bondability and causes reduced overall tensile strength of the steel stranded wires. To overcome defects in such a structure, tested production of the indented steel stranded wire has been launched. The invention invents the production process of the indented steel stranded wire for the purpose of realizing the indented steel stranded wire products, which comprises: acid cleaning with 80-180 g/l concentration of hydrochloric acid, phosphatization with 2 to 3 ml concentration of nitrite as an accelerating agent, saponification with 15% to 22% of soap flakes, drying by the temperature of 90 to 100 DEG C, cold-drawing the smooth, round steel wires, indenting the steel wires online through three-roller 120 degrees, twisting, application of tension intermediate frequency stabilization, wire coiling and package of finished product. Employing the process realizes the issues to be solved in the indented steel stranded product, and plays a reference function to the production of steel stranded wire product having large specification, high intensity and low loosening performance; and the product can be extensively applied to high-rise, long-span bridge, mine support and the like.

In a method for referencing the position of an actuating element of a functional unit, in particular of a clutch in the drivetrain of a vehicle, the attainment of a reference position of the actuating element is assessed for plausibility in that it is checked whether a variable which can be applied to the actuating element varies in a predetermined way in a predetermined spacing of the position of the actuating element from the reference position.

An apparatus for detecting a hazardous condition includes an optical module for measuring scattered light caused by the hazardous condition, a temperature sensor, a humidity sensor, and a processing unit coupled to receive signals from the optical module, the temperature sensor and the humidity sensor. The processing unit processes the signals to determine criteria to distinguish deceptive phenomena from a hazardous condition in order to limit false alarm. The processing unit is uses the criteria for adjusting an alarm threshold value that is a function of a reference function, a function based on temperature criteria, a function based on at least one of the temperature criteria and a ratio criterion, and a function based on humidity criteria.

The invention discloses a quick focusing method, a quick focusing apparatus and a mobile terminal. By a curve of a quick focusing reference function, a relatively greater second step size is used as a step size in search at an out-of-focus range between a first focusing point and a third focusing point, the out-of-focus range is moved quickly, and a relatively smaller step size is used as the step size in search at a sharp focusing range between a third focusing point and a fourth focusing point to accurately search for an optimal focusing point, since the number of searches is reduced more as compared with the prior art, searching efficiency is higher; further, two sides of the curve of the quick focusing reference function provided in the invention respectively increase monotonically and decrease monotonically, thus, a problem of inaccurate focusing caused by existence of local peaks in the prior art may be overcome.

The invention provides a 2-1T1R (2-1transistor1resistor) RRAM (resistive random access memory) unit with a reading self-reference function. The 2-1T1R RRAM unit consists of two conventional RRAM 1T1R memory units, wherein one of the conventional RRAM 1T1R memory units is a main memory unit, and the other conventional RRAM 1T1R memory unit is a reference storage unit. During writing operation, the two 1T1R memory units are written as two opposite states respectively; if the main memory unit is written as '1' and the reference memory unit is written as '0', a 2-1T1R memory value is '1'; or if the main memory unit is written as '0' and the reference memory unit is written as '1', the 2-1T1R memory value is '0'. During reading operation, the reference memory unit serves as a reference unit for generating the reading reference current of the main memory unit. Compared with a conventional mode of using fixed reading reference current by a memory array or generating the reading reference current through a shared reference unit, the 2-1T1R RRAM unit has the advantages that the reading margin during the reading operation is doubled; the reading speed and the reading success rate are greatly improved.

The invention discloses a circular synthetic aperture radar imaging method, belonging to the technical field of electronic signal processing. The invention relates to a spatial remote sensing and air-to-ground observation information processing technology, in particular to an onboard circular synthetic aperture radar imaging technology. According to the imaging method, an original oblique plane echo is mapped to the ground plane by solving the inverse of a system kernel function, and the distribution of signals in a wave number domain is obtained by multiplying an azimuth frequency domain with a reference function, so that plane wave approximation is avoided, the problem that the size of an imaging area of the traditional polar format algorithm is limited can be solved, and the imaging of a large imaging scene can be realized; pseudo-polar coordinates are used for replacing rectangular coordinates as an intermediate interpolation transition matrix, and the distribution density characteristic of the signals in the wave number domain is considered, so that the interpolation precision is higher, the obtained image resolution is higher, and the high resolution imaging can be realized; the imaging process only involves one-dimensional interpolation, and fast algorithms such as chirp z transform (CZT) and inverse fast Fourier transform (IFFT) are adopted, so that the method has very high computational efficiency and can realize rapid imaging.

The present invention relates to a distribution network evaluation method based on a combined evaluation method. The combined evaluation method is applied in distribution network evaluation, the prior comprehensive evaluation methods are applied comprehensively, and then the results of various kinds of evaluation methods with deviation are combined, so the distribution network evaluation method considers subjective and objective factors and has the advantages of various kinds of evaluation methods and has considerable reference function for concrete distribution network valuation at field, and the distribution network evaluation method can become the reliable and practical evaluation method for the distribution network planning personnel to evaluate and can greatly improve the standard of the prior distribution network planning comprehensive decision work. At the same time, the distribution network evaluation system can solve a series of practical problems in the distribution network evaluation very well, can direct and arrange scientific and reasonable distribution network constructing and rebuilding projects in practical evaluation and planning work and ensures the reliable and economical operation of the distribution network, thereby bringing great economic benefit.

The invention relates to a constant current source circuit with a band-gap reference function, comprising a band-gap reference core unit, a band-gap reference bias unit and a constant current source output unit, wherein the band-gap reference bias unit is used for providing bias current to a band-gap reference core; the band-bap reference core unit is used for providing band-gap reference voltage with a certain temperature coefficient to the constant current source output unit; and by combining a fuse wire trimming structure of the constant current source output unit, current of a whole constant current source branch can be adjusted. Through adjusting the temperature coefficient of the band-gap reference voltage to be matched with a temperature coefficient of resistance of the constant current source output unit, constant current source current which is insensitive to supply voltage and temperature is obtained. The constant current source circuit is applied to linear power supplies with micro power consumption and low voltage difference to ensure that the temperature coefficient of static current of the linear power supplies with low voltage difference is less than 50 ppm/DEG C, and the rejection ratio of the supply voltage is greater than 60 dB. The constant current source circuit can be applied to the field of linear power supplies with micro power consumption and low voltage difference.

A method of adapting a man-machine interface (20) of an aircraft (50) depending on the functional level of a pilot, the method comprising a plurality of successive steps. Firstly, before starting a mission, the characteristics of said mission and the characteristics and the physiological state of said pilot are determined. Thereafter, during said mission, the state of the mission and the current state of said aircraft together with a current behavior of said pilot are determined and a current functional level of said pilot is estimated. Thereafter, said current functional level of said pilot is compared with reference functional levels, and said man-machine interface (20) is then adapted in order to assist said pilot automatically and in optimum manner in making the pilot aware of the situation, in the pilot's decision-making, or in the actions taken by the pilot depending on the pilot's stress state or work load state.

A pointer field compression/expansion method is provided for a computer system having a data structure reference function using a pointer. The pointers in data structure which a program refers to are classified into pointers to be frequently referred to and those not to be frequently referred to. The pointers not to be frequently referred to are determined as targets of compression and expansion to thereby reduce and suppress the overhead required for the pointer compression and expansion. Information indicating whether or not a pointer in data structure is a compression target is provided separately or such identifying information is embedded into in the pointer whereby the compressed or uncompressed format of the pointer can be dynamically determined.

It is provided a computer-implemented method for compressing a three-dimensional modeled object, wherein the method comprises providing a boundary representation of the modeled object; determining first data, that describe a mapping from the range of a reference function to the range of another function, and second data, that describe a mapping from the domain of the other function to the domain of the reference function which, when composed with the reference function and the mapping from the range of the reference function to the range of the other function, leads to the same result as applying the other function; and replacing in the geometrical data the other function by the first data, the second data and a pointer to the reference function. Such a method improves the compression of a 3D modeled object.