289 results about "Test distance" patented technology

The invention discloses a implementing method and device for multi-carrier power sharing. The inventive method includes steps of: generating output power modulating instruction according to test distance between user terminal and base station, or coupling loss, or available signal power intensity of base station; sending the mentioned output power modulating instruction to base station, so as to instruct base station to distribute output power of multi-carrier for sharing according to the instruction. The invention dynamically modulates output power of carrier, improves power sharing, equivalently enhances coverage, reduces cost through scheduling of base station according to distance between user terminal and base station, coupling loss and intensity of available signal power received by user terminal, without changes on main hardware such as power amplifier.

In connection with a classification system for classifying media entities that merges perceptual classification techniques and digital signal processing classification techniques for improved classification of media entities, a system and methods are provided for automatically classifying and characterizing tempo properties of media entities. Such a system and methods may be useful for the indexing of a database or other storage collection of media entities, such as media entities that are audio files, or have portions that are audio files. The methods also help to determine media entities that have similar, or dissimilar as a request may indicate, tempo(s) by utilizing classification chain techniques that test distances between media entities in terms of their properties. For example, a neighborhood of songs may be determined within which each song has similar tempo characteristics.

The invention discloses a method for sensing a position of an object in the Internet of things, which is characterized by comprising the following steps of: establishing a three-dimensional coordinate system, and positioning a system for sensing the position of the object in the Internet of things, wherein the system consists of four ultra high frequency radio frequency identification (UHF RFID) reader-writers, an electronic tag and a general node module; determining the three-dimensional coordinate position of each UHF RFID reader-writer in the three-dimensional coordinate system; attaching the electronic tag to a tested object; testing a distance primarily to acquire a primarily-tested distance value d; solving an accurate actual distance d'; and solving the accurate position of the electronic tag. The method has the advantages that: by a phase difference of arrival (PDOA) distance measurement method with a dynamic frequency difference, the relative error of a measurement system can be stable, and a distance measurement error can be reduced when the actual distance is small.

A concrete self-restriction shrinkage stress detecting method relates to a method for detecting the concrete self-restriction shrinkage stress. The method aims at solving the problem of generating the self-restriction shrinkage stress caused by the shrinkage deformation difference at various positions in a concrete sample that is not considered by the existing concrete shrinkage stress detecting method. The method is provided with a humidity sensor arranged in a preformed hole of a first concrete sample with a prism shape, embedded with a plurality of groups of metal gauge heads at the two ends of an axes of a long axis of a second concrete sample with a prism shape in advance, respectively embedded with a metal gauge head along two ends of an axis of a thin slice shape sample, respectively detects relative humidity value, shrinkage value, and completely free shrinkage and deformation value at the location with a distance of h from the surface of the concrete, thereby calculating the self-shrinkage capacity at the location with the distance of h from the surface of the concrete. The detecting method of the invention can accurately and conveniently detect the self-shrinkage capacity of the concrete generated by the shrinkage and deformation at different positions of the inner and outer layers under different environmental conditions.

The invention relates to an antenna directional pattern testing method based on spherical surface near-field scanning extrapolation. Through near field testing, a far-field directional pattern can be obtained by subjecting obtained data to arithmetic extrapolation, so the testing distance is reduced and plane wave conditions required by cylindrical wave test are not required. A three-dimensional direction pattern obtained finally can analyze performance of an antenna more clearly and visually, and has great engineering practical value. The testing method can realize effective close-range antenna testing, saves testing cost, lowers testing difficulty, and meanwhile aims to obtain the three-dimensional direction pattern of a tested antenna so as to analyze performance of the antenna more accurately.

In connection with a classification system for classifying media entities that merges perceptual classification techniques and digital signal processing classification techniques for improved classification of media entities, a system and methods are provided for automatically classifying and characterizing melodic movement properties of media entities. Such a system and methods may be useful for the indexing of a database or other storage collection of media entities, such as media entities that are audio files, or have portions that are audio files. The methods also help to determine media entities that have similar, or dissimilar as a request may indicate, melodic movement by utilizing classification chain techniques that test distances between media entities in terms of their properties. For example, a neighborhood of songs may be determined within which each song has similar melodic movement properties.

The invention provides a far field test system and test method for a digital array secondary radar antenna pattern. The test system comprises a computer, a data processing module, a local oscillator module, a tester, a horn antenna, a digital T/R assembly, an array antenna and a turntable; a digital array secondary radar antenna emission pattern test module determines all frequency points and digital array secondary radar antenna emission patterns at different scanning angles; a digital array secondary radar antenna receiving pattern test module determines all frequency points and the digital array secondary radar antenna receiving patterns at different scanning angles. The far field test system for the digital array secondary radar antenna pattern can be unfolded under any environment meeting the far field test distance conditions, can automatically finish all tests of the needed far field patterns without manual intervention, and is easy to implement in engineering.

The invention provides a device and method for calibrating a non-contact type electrostatic voltmeter. The method includes the steps that a direct-current high-voltage power supply and metal plate electrodes are utilized to acquire a standard static filed at local space near the centers of the electrodes, the voltage of the non-contact type electrostatic voltmeter can be traced to the direct-current voltage standard, and an experimental method that the edge effect is increased is adopted to test the edge effect of the metal plate electrodes. The risks that people get an electric shock are reduced through a glass flat plate support which bears the metal plate electrodes and through a protective resistor, and a perpendicular moving mechanism can adjust the test distance of a calibrated meter. A detachable vernier caliper is adopted, and therefore tracing is convenient to conduct.

The invention discloses a hand-held automatic cable fault location device. The type of a cable fault can be judged automatically, the fault distance can be located automatically, and the test range can be selected according to the splitting condition of a cable. By manually selecting the test distance of a to-be-tested cable through a rotary switch, the problem on how to test a split cable can be solved. High-speed sampling is realized through a four-channel AD9288 chip, and the positioning accuracy and the system stability are improved. By setting a three-meter test extension line, the accuracy of short-distance fault location is improved, and the problem concerning test in a test blind area is solved. Test signals are calculated in real time through built-in SOPC, the fault type and the fault distance are calculated automatically, and the test efficiency is improved. Based on the design of SOPC, high flexibility is achieved, and upgrading can be carried out at any time according to user needs. By setting a screen locking key, test data can be locked in real time, and convenience is brought to users in test result recording.

The invention discloses a range-finding calibration tool and a range-finding calibration method and device. The range-finding calibration tool comprises a placing platform and a calibration substrate over the placing platform. The placing platform and the calibration substrate are in parallel. A mobile terminal is placed on the placing platform in order that an ultrasonic sensor of the mobile terminal emits ultrasonic to the calibration substrate. The calibration substrate is used for reflecting received ultrasonic back to the ultrasonic sensor of the mobile terminal in order that the mobile terminal may generate a test distance between the placing platform and the calibration substrate and generates a range-finding calibration parameter according to the test distance and a preset standard distance. According to the technical scheme provided by the embodiment of the invention, the range-finding calibration tool calibrates the range-finding function of the ultrasonic sensor of the mobile terminal and increases the range-finding accuracy of the ultrasonic sensor of the mobile terminal after the mobile terminal is used.

The invention belongs to the field of diodes and discloses a diode photoelectricity test method. The method includes: determining a diode wafer test distance; selecting to-be-tested chips on a wafer of a to-be-tested diode according to the test distance before the wafer of the to-be-tested diode is scratched; subjecting the selected to-be-tested chips to photoelectricity test respectively. The step of subjecting the selected to-be-tested chips to photoelectricity test respectively includes: connecting a first test probe into a P-electrode of the current to-be-tested chip; connecting a second test probe into an N-electrode of a first chip, wherein the first chip and the current to-be-tested chip are both positioned on the wafer of the to-be-tested diode; charging rated current or rated voltage to the first test probe and the second test probe; detecting photoelectric parameters of the to-be-tested chips by measurement equipment.

A full-solar-blind ultraviolet imaging quantified detection method based on a photon counting technology comprises the steps of: obtaining an ultraviolet photon counting equivalent value by adopting a formula shown in the specification; fixing a gain set value of a full-solar-blind ultraviolet detection instrument to the 60% position of a measuring range in a photon counting process; and carrying out photon counting in a specific area object, and carrying out counting on only a single discharge position, wherein a counting area covers all continuous points and more than 90% of stay points caused by rayleigh scattering. According to the invention, a full-solar-blind ultraviolet imaging instrument is used for detecting corona discharging, the specific position of corona discharging in a high-voltage electric device is obtained through an ultraviolet and visible light two-channel fused image in the ultraviolet imaging instrument, then ultraviolet photons at the corona discharging position are counted so as to carry out quantified analysis on the corona discharging, the influences factors such as the detecting distance, the environment humidity and the voltage level are modified, and an ultraviolet photon detection and correction formula superior to an existing standard.

A visual acuity testing apparatus capable of performing visual acuity testing under substantially uniform conditions even when a test distance and an installation distance vary has a projection optical unit including a disk whereon a chart is placed, an illumination light source, and variable projection lenses which are moved so as to change an image-forming position and an image size of an image of the chart, an input unit into which an installation distance between the screen and the visual acuity testing apparatus and a test distance between the screen and an examinee are inputted, a projection lens driving unit which moves the variable projection lenses based on the installation distance and the test distance, and a light intensity adjusting unit which adjusts light intensity based on the installation distance and the test distance so that brightness of the chart image falls within a predetermined reference range.

The invention relates to an automatic three-dimensional radio frequency identification (RFID) test device, and belongs to the technical field of RFID. The device comprises an upper computer, a three-dimensional moving mechanism, a mechanical cantilever, a connecting vertical post and a clamping mechanism, wherein the three-dimensional moving mechanism mainly comprises an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism which are assembled into a whole respectively according to an X-axis direction, a Y-axis direction and a Z-axis direction; one end of the mechanical cantilever is vertically installed on the Z-axis moving mechanism and the other end of the mechanical cantilever is vertically installed with the connecting vertical post; the clamping mechanism is arranged below the connecting vertical post; and the lower surface of the clamping mechanism is opposite to a test RFID reader. The device is designed based on an RFID reader antenna and a mobile phone terminal integrated with an electronic tag, the field intensity distribution of any one horizontal plane above the reader can be automatically tested, and the space distribution and a signal wave form of an electromagnetic field can be intuitively understood so as to analyze the performance of the reader, determine the maximum test distance and test the direction sensitivity.

A method for assessing technical parameters of narrow-band non-contact ultrasonic partial discharge testing instruments for power systems is characterized in that sinusoidal analog voltage signals which are outputted by a function generator, are adjustable in amplitude value and have the frequency of 40 kHz are used for driving a narrow-band ultrasonic emitter to generate space ultrasonic waves of which the radiant power can change in the forward direction; and for an ultrasonic testing instrument adopting a narrow-band non-contact manner, the sensitivity amplitude value, the directional included angle, the effective testing distance, the rangeability and other technical parameters are assessed practically. The method is combines the characteristic of integrative packaging number value display of a narrow-band non-contact ultrasonic partial discharge testing instrument, starts with the spread principle of space ultrasonic radiation, aims at the core technical parameters such as sensitivity, directionality, attenuation characteristic and rangeability, utilizes the function generator to solve the assessment problem of such equipment from the angle of space ultrasonic radiation, and has the remarkable advantages of portability, intuitiveness, accuracy, quantification, capability of repetition measurement, and the like.

The invention provides a method of acquiring a target RCS by using high resolution imaging. Firstly, a filtered-back projection algorithm is adopted to carry out imaging processing on target near field echo data; then, through a CLEAN algorithm, scattering centers are extracted from a two-dimensional image sequentially from strong to weak; and finally, each scattering center serves as a discrete point scattering source for vector composition to rebuild a target scattering field, and thus, the target RCS is calculated and obtained. As the filtered-back projection algorithm is high in imaging precision, the position information and the strength value of each scattering center of the target can be accurately presented; as the rebuilt scattering field is generated by a limited number of scattering centers extracted through the CLEAN algorithm, the scattering features of the target can be restored completely, and environment noise outside the target is not introduced. As no far field testing distance problem exists for the scattering centers, the scattering features obtained through vector composition are the far field scattering features of the target, and the target RCS calculation precision is ensured.

The invention discloses a near-field testing method for reconstructing an antenna array far-field directional diagram in a radiating near-field region, and belongs to the technical field of antenna measurement. The method comprises the steps: carrying out the phase correction of all antenna units in a to-be-detected antenna array; and reconstructing the antenna array far-field directional diagramin the radiating near-field region under a given distance, wherein the phase correction indicates that the beam pointing direction (shown in the description) of the antenna array far-field directionaldiagram and a near-field testing distance R jointly determine the phase distribution of all antenna units. According to the invention, a far-field directional diagram of a large-scale MIMO antenna array is directly reconstructed at a position with the testing distance R in the radiating near-field region, and the method does not need the near-field to far-field conversion. Afterwards, the methodcan achieve the direct measurement of the far-field directional diagram at the near-field testing distance R. Therefore, the method shortens the testing distance of the large-scale MIMO antenna array,and also reduces the complexity of a near-field measurement system.

The invention provides a visual functional detection system and method based on a smart phone. The system comprises a sighting mark display unit, a voice unit, an analysis and judgment unit, a real-time calculation unit, a sighting mark conversion unit, a real-time distance monitoring unit, a result display unit and a comprehensive analysis unit. The method includes the steps of utilizing mobile software to control visual functional detection, analysis, judgment and other procedures, utilizing a front-facing camera of the phone to real-timely monitor the testing distance between users' eyes and the sighting mark at the same time, and calculating a visual value corresponding to the presently displayed sighting mark according to the distance obtained from monitoring. The visual functional detection system and method based on the smart phone have the advantages of providing a fast and reasonable method for sighting mark conversion and definition judgment, achieving visual functional detection in any testing distance and real-time mobile detection of visual functions without an influence on precision of the detection, reducing system requirements for detection environment, effectively accelerating detection, enhancing randomness of occurrence of the sighting mark, and having a significant meaning for visual protection and prevention of visual diseases.

A test device for testing whether the distance between centers meets specifications includes a support member, a benchmark member set on a first end of the support member, to be positioned at the first through hole, a test member set on a second end of the support member, to be positioned at the second through hole, and a sliding member defining a receiving slot. The test member is also slidable in a direction perpendicular to the slidable direction of the test member. If the test member can enter the receiving slot, the first article is qualified, if test member cannot enter the receiving slot, the second article does not meet the required standard.

This invention discloses one washing machine drying speed control device, which comprises outside barrel and Hall displacement sensor and matched magnetic elements. This invention discloses one drying speed control method, which comprises the following steps: a, testing distance between washing machine outside cylinder and case; b, computing current bias reference values according to washing machine self parameters and current speed and clothes volume; c, judging the distance between outside barrel and case within current reference parameters range; if yes, then entering step d, if not then entering step e; d, improving speed; e, lowering rotation speed.

The invention provides a sensor obstacle avoiding system and method capable of detecting orientation of an obstacle. The system comprises a processor, a signal splitter, a multiple-path emitter, an emission signal processing module, a reception signal processing module and a receiver. The processor comprises a TOF chip. The emission signal processing module is arranged in the transmitting direction of the multiple-path emitter. The reception signal processing module is arranged in the optical signal receiving direction. The receiver is arranged in the light condensation direction of the reception signal processing module, and the receiver is connected with the processor. The multiple-path emitter sends infrared light signals having phase modulation in sequence according to time sequence.The emission signal processing module carries out spatial modulation on the multiple paths of infrared light signals to realize infrared light signal emission in the specific direction according to the fixed azimuth angle. The processor processes and calculates each orientation test distance information, and carries out analysis on all orientation distance information to obtain barrier distance, orientation and size information, thereby facilitating motion of a movement device and realizing an obstacle identification and detouring function.