300 results about "Triple frequency" patented technology

A three-band antenna device with resonance generation includes a dielectric layer having an upper surface and a lower surface, a grounding element, a first radiating element, and a second radiating element. The first radiating element is arranged on the upper surface for providing a first frequency band. The second radiating element is arranged on the lower surface and stacked below the first radiating element via the dielectric layer for providing a second frequency band, so as to generate a parasitic capacitance therebetween. A third frequency band is provided by the resonance of the parasitic capacitance and the parasitic inductance in the second radiating element.

A three-band, two-antenna, assembly includes a planar inverted-F antenna (PIFA) having a radiating / receiving element that is spaced from and extends generally parallel to a ground plane element. The planar radiating / receiving element of an inverted-F antenna (IFA) is located in an open space that exists between the radiating / receiving element of the PIFA and the ground plane element. The radiating / receiving element of the IFA extends either perpendicular to, or parallel to, the radiating / receiving element of the PIFA. The radiating / receiving element of the PIFA includes one or more open slot configurations that operate to provide dual resonant frequencies for the IPFA (AMPS / PCS or GSM / DCS). The radiating / receiving element of the IFA operates in a non-cellular frequency band (ISM or GPS).

The present invention refers to a triple-band antenna array for cellular base stations operating at a first frequency band and at a second frequency band within a first frequency range, and also at a third frequency band within a second frequency range. Said triple-band antenna array comprises a first set of radiating elements operating at the first frequency band, a second set of radiating elements operating at the second frequency band, a third set of radiating elements operating at both the third and the first frequency bands, and a fourth set of radiating elements operating at both the third and the second frequency bands. The radiating elements are arranged in such a way that at least some of the radiating elements of the first set are interlaced with at least some of the radiating elements of the third set, and at least some of the radiating elements of the second set are interlaced with at least some of the radiating elements of said fourth set. Further the invention relates to a slim triple-band base station for mobile / cellular services that includes in its radiating part two or more of said triple-band antenna arrays.

The invention relates to a global navigation satellite system (GNSS) triple-frequency motion-to-motion positioning method. In the original epoch, the triple-frequency precision single-point positioning technology is adopted to obtain the coordinates of two movable carriers, one of the two movable carries is selected as the reference station for the triple-frequency double-difference position, the triple-frequency double-difference positioning technology is adopted to calculate the baseline component of the two movable carriers and the integer ambiguity resolution of the double-difference carrier phase, and the baseline component of the two movable carriers and the integer ambiguity resolution of the double-difference carrier phase are used as the constraint conditions for the triple-frequency precision single-point positioning in the subsequent epochs to improve the single-point position precision and the convergence speed thereof. The geometry-Base TCAR ambiguity resolution fixation method is adopted to calculate the triple-frequency integer ambiguity resolution. The three irrelevant combination observation values of the triple-frequency non-ionizing layer and the long wave-length and low noise carrier are adopted to detect and repair the cycle slip of the original observation data.

The invention discloses an electrified tester for a zinc oxide arrester, and relates to an instrument for detecting alternating-current parameters of a metallic oxide arrester in an electrical power system in the process of charged running. The electrified tester comprises a master machine and a slave machine; a current sensor lead wire, a current sensor unit, a program control amplification unit, a current signal processing control unit and a wireless signal receiving module are connected sequentially and are connected with an upper computer; the upper computer is respectively connected with the current signal processing control unit, a liquid crystal display, a keyboard and a mouse to form the master machine; a voltage sensor lead wire, a voltage sensor unit, a voltage signal processing control unit and a wireless signal emission module are connected sequentially to form the slave machine; and the master machine and the slave machine control signals and data through wireless communication transmission. The electrified tester is suitable for detecting total leakage current, resistive current fundamental waves and triple frequency harmonic at regular intervals on the running metallic oxide arrester and checking the running performance of the metallic oxide arrester.

The invention discloses a Beidou three-frequency non-differential non-combined observation value time transmission system and method. The method includes the steps that phase observation value, pseudo-range observation value, satellite ephemeris, earth rotation, antenna phase center and other parameters of China Beidou satellite navigation systems at two time transmission stations are obtained; data check, gross error reject and cycle slip detection are carried out, error models of ephemeris, tide, relativity, the earth rotation, atmosphere and antenna phase deviation are corrected; an ionospheric virtual observation model with additional ionospheric prior information constraints, spatial domain constraints and time domain constraints is constructed; and a three-frequency non-differentialnon-combinatorial precise single-point positioning model is constructed, a single-point positioning timing solution is carried out on corrected data, and comprehensive clock corrections of receivers of the two transmission time stations are obtained and compared to obtain a time transmission difference; and compared with standard time of one of the two transmission time stations, precise time of the other one of the two transmission time stations is obtained. According to the Beidou three-frequency non-differential non-combined observation value time transmission system and method, the observation noise can be reduced, and the accuracy and reliability of time transmission are improved.

The invention is suitable for the field of radio frequency communication, and provides a double-stage inversing D-class power amplifying circuit and a radio frequency power amplifier. The circuit comprises an input passive component connected with a block condenser, a positive and negative double-way driving-stage F-class amplifier, a positive and negative double-way amplifying-stage inversing F-class amplifier and an output passive component, wherein the two input ends of the positive and negative double-way driving-stage F-class amplifier are connected with the two output ends of the input passive component through two block coupling condensers, the two input ends of the positive and negative double-way amplifying-stage inversing F-class amplifier are connected with the two output ends of the positive and negative double-way driving-stage F-class amplifier through two condensers, and the two input ends of the output passive component are connected with the two output ends of the positive and negative double-way amplifying-stage inversing F-class amplifier through the two condensers. By utilizing an F-class driving inversing F-class push-pull structure, according to the harmonic shaping technology, the efficiency, the power and the gain of the power amplifier are improved, the independent control from a fundamental wave to a triple frequency harmonic impedance is achieved, the design difficulty is lowered, and the tedious debugging work in the later period is lowered. In addition, due to the positive and negative double-way structural design, the power and the gain are further improved.

This invention is a detecting of Roman-Mie dispersion laser atmosphere signal and laser radar. It sets up the radar with the output of double-frequency 532nm and triple-frequency 355nm, launches the 532nm, 15% of the 35nm to the sky and 85% of the 355nm after diffusion, and the two optical paths parallel with the optical path of the receiving telescope, and simultaneously carry out the pitching motion with the receiving telescope; the receiving telescope backward dispersing light, the backward light gets into the telescope, then passes the glare tube, the adjusting field view stop and ocular glass, and the dichroic mirror process, and divides the 407nm, the 386nm and the 532nm scattered light into three beams, and the 532nm scattered light is divided into 15% and 85% beams, and the four beams are respectively received by the multiplier phototube, magnified by the magnifier and collect and process the data. It can detect the level visibility of the atmosphere, the aerosol of the whole troposphere and the vertical outline of winding cloud light eliminating system and the water and air mixture ratio from the ground to the lower part of the troposphere. The detecting error of the level visibility is 15%, the errors of the aerosol light eliminating modulus and the vertical outline of the water and air mixture are 20%.

The invention discloses a three-frequency band near-infrared absorber based on a semiconductor super-surface structure, and belongs to the field of metamaterials. The three-frequency band near-infrared absorber sequentially consists of a substrate, a metal film layer and a semiconductor super-surface structure layer from bottom to top, wherein the semiconductor super-surface structure layer consists of a semiconductor particle array and a semiconductor film layer. The three-frequency band near-infrared absorber based on the semiconductor super-surface structure has the advantages that by reasonably designing the geometric size and lattice cycle of the semiconductor super-surface structure layer, the electromagnetic wave which is transmitted into the structure surface is completely absorbed; the structure is simple, the near-infrared band absorbing is realized, and three absorbing peaks are provided; the electromagnetic wave absorbing power is made of the semiconductor material, so that the limitation of only production of single resonance absorbing peak by the single size of the traditional metal resonance unit is overcome, and the absorber is applied into the fields of photoelectrical detection, photoelectrical conversion, production and collection of photo-induced electrons and thermal electrons, absorbing of electromagnetic energy, and the like.

A cost efficient multi-band antenna, for use with non-harmonically related frequency bands, for example dual Wi-Fi frequency bands. An antenna element extends away from a ground plane. A sleeve positioned coaxial about the antenna element is spaced apart from the antenna element and the ground plane. Dimensions, spacing and dielectric constants of the antenna element, sleeve and any dielectric spacers are selected to tune the antenna to the desired frequency bands. Further, the ground plane may be the radiating element of, for example a GPS module or SDAR antenna to create a triple frequency band antenna assembly.

The invention designs a three-frequency dual-circular polarization GPS microstrip patch antenna, comprising circular truncated cone metal base, feed network and stacked patch, where the stacked patch comprises lower layer, medium layer and upper layer from the bottom up, respectively resonant with three frequency ranges; the feed network comprises 3dB electric bridge and wideband power dividers, i.e. using two power dividers to implement three-frequency range three-port output, simplifying the feed network. And the highly proper circular truncated cone metal base obviously increases low elevation gain. And the invention implements simultaneous operating of three-frequency range circular polarizations, having features of wide frequency range and good low elevation gain, and suitable for vehicle-carried multi-frequency multi-port wide beam circular polarization user machine antenna.

The invention discloses a method for detecting and repairing a cycle slip by utilizing a BeiDou three-frequency observed quantity. The method mainly comprises the following steps of: 1, performing linear combination by utilizing the three-frequency observed quantity under the condition of providing a three-frequency signal by a BeiDou satellite navigation system, and constructing a combination noise detection quantity by selecting proper combination coefficients to detect the cycle slip; 2, after the cycle slip is detected, calculating and screening to obtain three sets of combination coefficients with superior performance in a pseudo-range carrier phase combination method, and calculating and repairing the cycle slip by utilizing the pseudo-range carrier phase combination method; and 3, finally, performing verification on a cycle-slip repairing effect by utilizing the combination noise detection quantity. The method for detecting and repairing the cycle slip is not related to the motion state of a carrier, can be used for reliably detecting and repairing the minimum cycle slip of which the time of losing lock reaches up to 30 seconds and can be used for detecting and repairing the cycle slip by the zero-difference, single-difference or double-difference carrier phase observed quantity when static measurement or dynamic measurement is performed.

Printed circuit techniques and two-shot molding techniques are used to form a metal radiating element, a metal ground plane element, a metal antenna feed, a metal short-circuiting strip and metal capacitive loading plates within small antennas that are buried within transmit / receive radio-devices such a mobile cellular telephones. Balanced and unbalanced, single-feed, two and three band antennas are provided wherein the radiating element is laterally spaced from the ground plane element, to thereby provide an antenna having a very low profile or height, including antennas wherein the ground plane element and the radiating element are placed coplanar on the same surface of a PCB. A thin dielectric carriage on a PCB allows for the metal capacitive loading plates to be placed on the sidewalls of the dielectric carriage, to thereby provide reactive loading of a radiating element that is on the top surface of the dielectric carriage.

This invention put forward two single phase earth protection methods for generator stator based on zero-sequence voltage fault component, both utilizing that of its terminal and neutral point, in which the first method is to utilize triple-frequency harmonic voltage fault component vector composition to make up the decision basis; the second method is to directly take the sum and difference of random value of the zero-sequence voltage fault component at both sides of its terminal and neutral point as the protect signal and brake signal to detect the stator single phase earth fault by comparing spectrum energy in the data window.

A triple-band offset hybrid antenna having a shaped reflector is disclosed. The triple-band offset hybrid antenna includes: a shaped reflector reflecting a K / Ku bands RF signals received from a satellite to focus an energy of the K / Ku band RF signals on a focal line and reflecting a Ka band RF transmitting signal; and a triple-band active phased feed array receiving the reflected K / Ku bands RF signals from the shaped reflector and radiating the Ka band RF transmitting signal to the shaped reflector, wherein the triple-active feed array including Ka / K bands feed array for transceiving Ka / K bands RF signal and a Ku band feed array for receiving a Ku band RF signal.

The invention discloses a Beidou three-frequency signal carrier phase whole cycle ambiguity single epoch determining method. On the basis of the a geometry irrelevant model, the ambiguity of all the combinations are determined step by step through the matching of determination of a Beidou three-frequency combined model, the calculating of a three-frequency super wide combination ambiguity single epoch, the calculating of optimized wide item ambiguity, and the calculating of optimized narrow item ambiguity, and the calculating of the three-frequency signal ambiguity single epoch is completed. According to the method, on the aspect of the three-frequency ambiguity calculation, a LAMBDA method highest in ambiguity calculating success rate is adopted and is improved, so that the single epoch searching success rate is further improved. The method is higher in fixed ambiguity efficiency, and can be better applied in real-time dynamic environments.

The invention relates to an ultrahigh metallic resistance composite multi-frequency wave-absorbing material and belongs to the technical field of wave-absorbing materials. The technical problems that in the prior art, a circuit simulation wave-absorbing structure is narrow in wave-absorbing bandwidth, single in wave-absorbing frequency band and large in relative thickness are solved. The wave-absorbing material comprises a frequency selecting surface, a medium layer and a metal bottom plate. The frequency selecting surface is composed of patch units arrayed periodically, and each patch unit comprises a square patch, a first square surrounding patch and a second square surrounding patch, wherein the square patch, the first square surrounding patch and the second square surround patch are sequentially arrayed from inside to outside according to the length of sides. The wave-absorbing material further comprises four L-shaped patches which are symmetrically arranged outside four right angles of the second square surrounding patch. The double-frequency or triple frequency wave-absorbing characteristic that the reflection coefficient, below -10dB, of the wave-absorbing material is adjusted within the 4 GHz-18 GHz range can be achieved, the reflection coefficient of about -20 dB can be achieved nearby a wave-absorbing harmonic peak, and therefore a higher wave-absorbing effect is achieved.

The invention provides a free-moving type three-dimensional scanning method, belongs to the field of optical detection, and relates to a full three-dimensional skeleton surveying method, a handheld measuring device and a multi-angle splicing method based on texture, the curvature of surface and normal directions. Mobile handheld high-precision three-dimensional scanning is a problem of the scanning field, according to the free-moving type three-dimensional scanning method, a three-frequency color fringe projection method is utilized to project three-frequency color fringes of 1 : 4 :12 to the surface of a tested object through a projection device, and a camera is used for shooting a deformed fringe pattern in a single-frame exposure mode. On one hand, a three-frequency phase unwrapping method is adopted by the deformed fringe pattern to calculate out high-frequency carrier frequency to unwrap a phase, and system calibration parameters are used for obtaining a three-dimensional point cloud of the tested object; on the other hand, a texture pattern of the surface of the tested object can be recovered through the deformed fringe pattern. Handheld scanning has a higher requirement for multi-angle splicing, and by means of the free-moving type three-dimensional scanning method, non-mark splicing of multi-angle point clouds is achieved according to the color texture characteristics, measurement of the curvature of surface and restraint of the normal directions.

The invention discloses an on-line detection method of a metal oxide arrester insulating property influencing factor. The on-line detection method comprises the following steps of: firstly obtaining total current i x (t) of leakage current from a metal oxide arrester ground downlead, and separating resistive current i r (t) from the total current; calculating a total current amplitude value I x, a resistive current amplitude value I r, fundamental current amplitude value I r 1 in the resistive current and a triple-frequency harmonics electric current amplitude value I r3 in the resistive current; and further calculating an aging coefficient beta of a metal oxide arrester, if the I x is greater than a setting value or the I r is greater than the setting value, judging the insulating property of the metal oxide arrester to be poor, and then forming criteria according to the I r, the I r 1, the I r 3 and beta. The method can exactly distinguish the influencing factor which causes the insulating property of the metal oxide arrester to get poor, is beneficial to shortening power off overhaul time, prolongs the service life of metal oxide, and has very important meanings of reducing power off loss and guaranteeing an electric system to safely and economically operate.

The invention discloses a wide lane ambiguity resolution method through BDS and GPS observation information fusion. The method comprises the steps of firstly, using the triple-frequency advantage of a BDS and performing preferred and reliable single-epoch fixing of the combination ambiguity of a ultra wide lane and a wide lane of the BDS; and secondly, using short-term stable variation characteristics of ionized layer delay, parameterizing inclining ionized layer delay values of different satellites of the BDS and the GPS, and using the ionized layer frequency relationship for simultaneously solving different combination observation values (including a pseudo-range), wherein, the BDS comprises pseudo-range observation values at three frequency points and ultra wide lane or wide lane observation values with two fixed ambiguities and the GPS comprises pseudo-range observation values at two frequency points and wide lane observation values with the wide lane ambiguity to be evaluated. Common position increment parameters are used for fusion of the above observation information, and a geometric correlation model is made for kalman filtering. The method provided by the invention can be used for significantly increasing the resolution precision and speed of the wide lane ambiguity of a dual-frequency system, especially of a low altitude angle satellite.

The invention relates to a real-time high-precision locating method used for surveying and mapping and navigating, which comprises the following steps of: preprocessing triple-frequency observed data of a reference station and a mobile station, forming ultra-wide lane optimal combination observed values phi(0,1,-1) and phi(1,-6,5) and narrow lane combination observed values P(0,1,1) by adopting the processed triple-frequency observed data of the reference station and the mobile station, and detecting whether the ambiguity of the previous epoch is constant or not; if the ambiguity of the previous epoch is constant, delivering the constant ambiguity of the previous epoch to the current epoch on the premise of ensuring that the cycle slip is correctly processed; if the ambiguity of the previous epoch is not constant, enabling the optimal combination ambiguity to be constant by utilizing Geometry-free and Geometry-based models; and reversely solving ionospheric delay by utilizing two ultra-wide lane observed values with constant ambiguity and correcting any one wide lane observed value; smoothing the ionospheric correction wide lane observed values to obtain high-precision observed data; and locating with the high-precision observed data. The invention has simple arithmetic, high precision, stable performance and wide range of application.

The invention belongs to the field of controlling a wind driven generator power conversion device and relates to a method for controlling a double-fed wind driven generator in power grid faults. The method comprises the following steps of: calculating a rotation angular velocity, calculating a stator voltage, a stator current and a rotor current under two-phase static coordinates, calculating a stator magnetic flux linkage and calculating d, q shaft stators voltage and stators current under synchronous rotational coordinates, calculating a slip-frequency angle and a slip-frequency angular velocity, calculating d, q shaft stators current under rotational coordinates, calculating a stator reactive power, calculating a rotor decoupling compensatory voltage, acquiring the actual values of a double frequency component and a triple frequency component of the rotor current after guiding the d, q shaft rotors current under rotational coordinates to flow by two band-pass filters and advanced delaying rings, acquiring the compensatory items of the double frequency component and the triple frequency component by two PI controllers after subtracting the actual values from the preset values of the double frequency component and the triple frequency component, summing the two compensatory items, acquiring a preset value of the rotor q shaft current under rotational coordinates and the reference values of d, q shaft rotors voltages under rotational coordinates by calculating with the PI controller after subtracting a preset value of the rotate speed from the actual value of the rotation angular velocity, calculating a rotor voltage under the two-phase static coordinates, and generating a switching signal for controlling a power device. The invention can efficiently prevent DFIG rotor current oscillation caused by the power grid fault, realize the on-line running of the wind driven generator and promote the running performance of the DFIG in power grid faults.

An antenna apparatus for a mobile communications terminal and its operation method in which the length of an antenna can be varied according to the changes in the usage environment. The antenna requires minimal space for installation, and can support multiplexing of frequency bands, such as tri-band or quad-band capabilities, so as to reduce the deterioration of signal transmission and reception sensitivity caused by changes in the usage environment, such as effects from the user's hand that holds the terminal, an act of opening and closing of a folder portion of the terminal, and the like.

A cost efficient multi-band antenna, for use with non-harmonically related frequency bands, for example dual Wi-Fi frequency bands. An antenna element extends away from a ground plane. A sleeve positioned coaxial about the antenna element is spaced apart from the antenna element and the ground plane. Dimensions, spacing and dielectric constants of the antenna element, sleeve and any dielectric spacers are selected to tune the antenna to the desired frequency bands. Further, the ground plane may be the radiating element of, for example a GPS module or SDAR antenna to create a triple frequency band antenna assembly.

The invention discloses a GNSS carrier phase integral cycle ambiguity single epoch solution method. The method comprises the steps that three-frequency observation data in a Beidou satellite navigation system are used to build optimal combination observation; single epoch fixation is carried out on ultra-wide lane / wide lane and base carrier ambiguity in order; a Beidou satellite with high fixed ambiguity reliability is preferably selected to inverse atmospheric delay information; the information is used as priori information to enhance a GPS / GLONASS ionosphere-free combination ambiguity solution model; correlation between the zenith and troposphere and ambiguity parameters is reduced; the morbidity of the model is weakened; a robust estimation theory is introduced; and through the influence of the bias of a right election iterative boycott model or outliers, ambiguity single epoch accurate solution in a GPS / GLONASS dual-frequency navigation system is realized. The solution method is suitable for a short distance relative positioning mode. The advantage of the three-frequency observation data of the Beidou navigation system is used to constrain and assist the ambiguity solution of other satellite navigation systems. The robust estimation theory is introduced, which improves the reliability of ambiguity solution.

The invention discloses a three-frequency heterodyne phase-shifting de-phasing method, which comprises the following procedures: (1) three stripes of different frequencies are selected for projecting; (2) the three stripes of different frequencies are projected; two cameras are used for taking pictures, the included angle between the optic axes of the two cameras is 0-40 degree, each camera takes 12 images of grating; (3) the grating images are de-phased by 4-step phase-shifting way, and the main relative phase is obtained; (4) the main phase is worked out; (5) phase development is carried out on the main phase, and the grey scale diagram of the phase is obtained. The invention uses secondary heterodyne technology, can reduce error, greatly improve the de-phasing accuracy, hence improve the accuracy of the measuring system. By using a method in conjunction with the heterodyne principle, the invention not only gives play to the advantage of the phase-shifting way, but also can accurately get the phase of the measured object.

The invention relates to a method for achieving network real-time kinematic positioning based on GNSS multi-frequency data and CORS. The method comprises the steps that three-frequency data are acquired from a receiver of a global positioning system and a receiver of a Beidou satellite navigation system; the three-frequency data are combined, and two sets of ultra-wide item combination observation values are constructed; known site information is acquired from the CORS; the ambiguity of the ultra-wide item combination observation values is fast fixed through the known site information; the ionized layer error of each epoch is calculated through the ultra-wide item combination observation values with the ambiguity fixed; atmosphere error model information is calculated through the ionized layer errors and the known site information; the network real-time kinematic positioning is carried out according to the atmosphere error model information. According to the method for achieving the network real-time kinematic positioning based on the GNSS multi-frequency data and the CORS, a complex ambiguity search can be avoided, and therefore an atmosphere error model is fast constructed, a reliable data source is provided for the release of network RTK differential information, and the method is suitable for large-scale popularization and application.

The invention discloses a method, device and system for controlling a compressor. The method comprises the steps that input current input by an alternating current power source is obtained and input power pulse input to a PFC converter is reduced, wherein harmonic components at least include triple frequency harmonic components and / or quintuple harmonic components; after the input current into which the harmonic components are injected is input to the PFC converter, a PFC control circuit adjusts output power of the PFC converter by controlling on-off of a controllable switching tube in the PFC converter, so that the input power and the output power of the PFC converter are balanced. The technical problem that voltage ripples of a motor drive circuit are high due to the fact that no electrolytic capacitor exists in the prior art is solved.