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139 results about "Pulsar" patented technology
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A pulsar (from pulse and -ar as in quasar) is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed only when a beam of emission is pointing toward Earth (much like the way a lighthouse can be seen only when the light is pointed in the direction of an observer), and is responsible for the pulsed appearance of emission. Neutron stars are very dense, and have short, regular rotational periods. This produces a very precise interval between pulses that ranges from milliseconds to seconds for an individual pulsar. Pulsars are one of the candidates for the source of ultra-high-energy cosmic rays (see also centrifugal mechanism of acceleration).
Spacecraft navigation system for equivalent device of X pulsar detector
ActiveCN102175246AChange precisionIncreased accuracy rangeInstruments for comonautical navigationTime informationDynamic equation
The invention discloses a scheme of a spacecraft navigation based on an X pulsar detection equivalent device. The scheme mainly comprises the following processes of simulating X pulsar emitting photon information detected by an X pulsar detector, and resolving a spacecraft position and speed navigation information. The overall simulation process is divided into three parts, namely detector simulating, data processing and navigation resolving. In the first part, the detector simulates the photon arrival time; in the second part, a data processing system performs cycle folding according to the photon arrival time of the X pulsar, calculates a pulse profile, performs time conversion, and performs pulse profile cross-correlation processing with a standard profile stored by a known ephemeris so as to finish the calculation of the pulse arrival time; and in the third part of navigation resolving, a precise spacecraft orbit and time information are resolved finally by taking the pulse arrival time as measurement information and combining an orbit dynamic equation and kalman filtering. By the X pulsar equivalent device, the influence of various parameters and different algorithms such as a resolution ratio, a view field, time conversion precision, a folding algorithm and the like on the autonomous navigation accuracy of the spacecraft can be analyzed, and necessary technical support is provided for the development of an X pulsar-based autonomous navigation system and the research on combined navigation with other systems.
Owner:山东中宇航空科技发展有限公司
Navigation system and method using modulated celestial radiation sources
A system and method for navigation utilizes sources of modulated celestial radiation. A spacecraft, satellite, or other vehicle (12) has one or more modulated radiation sensors (22a-22x) mounted thereto for detecting a modulated signal (14) generated by one or more pulsars or other celestial objects (16). A timer (24) measures the pulse time of arrival at a respective pulse sensor (22a-22x) by comparing the pulse signal (14) with a known pulse profile, and a processor (30) calculates a timing difference between the measured pulse time of arrival at sensor (22a-22x) with a calculated pulse time of arrival at a selected reference point (100). The positions and pulse profile characteristics of the pulsars (16) are stored in a digital memory (34) and combining the calculated time difference with the known positions of pulsars (16), the navigational parameters, such as position, velocity, and attitude, for spacecraft (12) with respect to the selected localized reference point (100) can be calculated.
Owner:UNIV OF MARYLAND
Navigational system and method utilizing sources of pulsed celestial radiation
A system and method for navigation utilizing sources of pulsed celestial radiation are provided. A spacecraft, satellite, or other vehicle (12) has a pulse sensor (22) mounted thereto for detecting signal pulses (14) generated by a plurality of pulsars or other celestial objects (16). The detected signal pulses (14) are synchronously averaged at the known period of the pulsar or other celestial object (16) with respect to a timer (24). Timer (24) measures the pulse time of arrival at the pulse sensor (22) by comparing the pulse signal (14) with a pulse shape template (52), and a processing means (30) calculates the offset time between the measured pulse time of arrival at sensor (22) with a calculated pulse time of arrival at the solar system barycenter (SSBC). The positions and pulse profile characteristics of the pulsars (16) are stored in a digital memory (34) and combining the calculated time offset with the known positions of pulsars (16), the navigational position, velocity, attitude and time of spacecraft (12) with respect to the SSBC can be calculated.
Owner:UNIV OF MARYLAND
Satellite autonomous navigation system and method integrating pulsar radiation vector and timing observation
InactiveCN103674032ASolve the rotation problemRelieve stressInstruments for comonautical navigationNatural satelliteHorizon
The invention discloses a satellite autonomous navigation system and a satellite autonomous navigation method integrating a pulsar radiation vector and timing observation. The system obtains pulse arrival time and accurately obtains a pulsar radiation direction vector by using a time distinguishing detector and a collimator, and obtains a geocentric direction vector by using an infrared or ultraviolet horizon sensor; a navigation computer respectively completes a pulsar timing observation navigation algorithm under a geocentric coordinate system, a pulsar positioning algorithm based on angular distance measurement and a geometric orientation algorithm based on angular distance measurement by using the pulsar pulse arrival time, the radiation direction vector and the geocentric direction vector, and obtains the position, the speed, the attitude and the on-track movement direction of a spacecraft through integration of several algorithms, so as to complete the autonomous navigation of an orbiting satellite, and output high-precision position, attitude and speed information. The system is suitable for autonomous operation control of orbiting satellites or constellations of the earth or other planets.
Owner:XIDIAN UNIV
Constellation orientated simulating system and method based on X-ray pulsar
The invention discloses a constellation orientated simulating system and method based on an X-ray pulsar. The constellation orientated simulating method is characterized by comprising the steps of measuring a relative distance between stars by using an equation of light spread by an inter-star link or X-ray pulsar signal between satellites, obtaining an included angle between satellite base lines in a constellation, meanwhile, extracting a pulsar radiation direction vector by a satellite borne X-ray detector and a collimator which are matched, calculating an included angle between the vector and the satellite base lines, further calculating an included angle between the vector and the plane of the constellation, measuring integral rotation and drift of earth orbiting satellites or constellation and correcting. The constellation orientated simulating system based on the X-ray pulsar comprises a signal simulating unit, a time maintaining unit, a modulation unit, a controllable light time delay unit, an optical sending unit, an optical receiving unit, a photon detecting unit and an oriented simulating unit. The constellation orientated simulating system is capable of performing analogue simulation on realization of signal generation, transmission, acquisition, processing and oriented algorithm in the process of orienting the X-ray pulsar.
Owner:XIDIAN UNIV
Random waveform X-ray generating device and generation method
The invention relates to a random waveform X-ray generating device and a generation method. The random waveform X-ray generating device comprises a random signal generator used for generating high-stability random waveform, a grid-control X-ray bulb tube power supply system and a grid-control X-ray bulb tube of a working power supply used for providing grid-control X-ray bulb tube filament current, grid electrode control signals and anode high voltage. The grid-control X-ray bulb tube uses the electric signals generated by the random signal generator to control electron beams in the X-ray bulb tube emitted by filament to the anode so as to achieve generation of X-ray of random waveform. The random waveform X-ray generating device resolves the technical problem that only X-ray with single waveform can be generated in the prior art, is a high-stability random waveform X-ray generating device, aims at achieving generation of high-stability random waveform X-ray and provides an experimental apparatus of simulating an X-ray source for a pulsar navigation ground simulation system.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Autonomous relative navigation method for multi-information fusion formation spacecrafts
InactiveCN101793526AMeet spaceMeet needsInstruments for comonautical navigationAviationNavigation system
Owner:HARBIN INST OF TECH
Autonomous navigation method for planet in final approaching section
InactiveCN103234538AHigh implementabilityHigh measurement accuracyNavigation instrumentsPulsarState model
The invention relates to an autonomous navigation method for a planet in a final approaching section, which belongs to the field of deep space exploration. The method comprises the following steps: establishing a state model of the planet in the final approaching section; carrying out radio measurement and communication through a detector and planetary orbiters determined by n positions, observing m pulsars and establishing an autonomous navigation measurement model of the planet in the final approaching section; and calculating the state of the detector through navigation filtering based on the two models. According to the invention, measurement characteristics of pulsar navigation and radio navigation are combined in the autonomous navigation method, a non-linear filtering method is employed, so autonomous navigation of the planet in the final approaching section is realized, precision and instantaneity of autonomous navigation of the planet in the final approaching section are improved, and the autonomous navigation method has good exploitativeness and high measurement precision and can satisfy the requirement for instantaneity of autonomous navigation.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Pulsar accumulated pulse profile time delay measurement method by sparse representation
InactiveCN103217162AInfluence of measurement accuracySuppression of the effects of cumulative pulse profile time delay measurement accuracyInstruments for comonautical navigationMeasurement precisionAccuracy and precision
Owner:XIDIAN UNIV
Combined estimation method of pulsar navigation position and speed
InactiveCN103217161ASmall amount of calculationPrecise positioningInstruments for comonautical navigationPulsarEstimation methods
The invention relates to a combined estimation method of pulsar navigation position and speed. The invention belongs to the field of spacecraft autonomous navigation. According to the method, an observation interval is divided into a plurality of sub-intervals; in each observation sub-interval, pulse signals are superimposed according to a pulsar radiation period, such that a pulse accumulation sub-contour is obtained; the pulse accumulation sub-contour is processed with a quasi-maximum likelihood estimation method, such that a pulse arrival time of each sub-interval is obtained; and according to the pulse arrival times, spacecraft position and speed are estimated with a least square estimation method. The method provided by the invention provides high-precision positioning and speed determination, which are close to those of Cramer-Rao lower bound. Also, a computation amount is low. Therefore, the method provided by the invention has important practical significance upon spacecraft autonomous navigation based on pulsar.
Owner:WUHAN UNIV OF SCI & TECH
Rolling bearing for a wheel of vehicle and a semi-float type bearing apparatus having it
ActiveCN1573150AGuaranteed areaAvoid enteringEngine sealsRoller bearingsPulsarRolling-element bearing
A vehicle wheel rolling bearing has a sealing device integrated with a magnetic encoder. A semi-float type bearing apparatus has said rolling bearing which can protect a magnetic encoder and improve the sensing ability of the detecting sensor. The rolling bearing has an inner member with a wheel hub having a wheel mounting flange and an inner ring formed with inner raceway surfaces. An outer member is formed with double row outer raceway surfaces opposite the inner raceway surfaces. Double row rolling elements are between the raceway surfaces. Sealing devices include an inboard sealing device with an annular seal fitted on the outer member. A pulsar ring is mounted on the inner member and has an encoder mounted on a cylindrical holding portion. The encoder is arranged opposite to the annular seal. The encoder includes magnetic poles formed by magnetic powder with alternating polarity along its circumferential direction. A detecting sensor passes through the cylindrical portion of the seal and opposes the encoder. A predetermined air gap is kept between the encoder and detecting sensor.
Owner:NTN CORP
Pulsar observation device, system and method
InactiveCN106403930AHigh precisionImprove accuracyNavigation by astronomical meansTime informationTime error
The invention provides a pulsar observation device, system and method. Accurate time interval information can be obtained by counting a sampling clock, the time information of sampling time and sampled data are input into a data frame together to ensure highly consistent time and signal, the integer seconds obtained by time synchronization of a hydrogen atomic clock and a GPS receiver and the decimal seconds obtained by counting the sampling clock are utilized to acquire time information, thereby acquiring nanosecond scale high precision pulsar signal arrival time, and greatly improving the precision and accuracy of pulsar observation. In order to avoid the time error caused by data transmission loss, a network checking head is added in the data frame, compensation can be carried out if data frame loss is found, thus guaranteeing the data integrity and time continuity of long-time observation, and being of important significance to pulsar observation data processing.
Owner:XINJIANG ASTRONOMICAL OBSERVATORY CHINESE ACADEMY OF SCI
Traffic Signal String SuperMode Control Method
The invention relates to a traffic signal mode field, discloses a method for a supermode of traffic signal control: String Supermode, its main steps includes: 1)get String Supermode instruction; 2)set the basic parameters of String Supermode: subareas of a roadnet, period-redistribution; 3)set 2D greenwave mode in the relative subareas according to a String Supermode structure; 4)calculate the 2D greenwave time-offsets and their interim-period in each subarea; 5)run new mode after the above interim-period run out. The present invention realizes the effectiveness of signals equilibrium, high effieciency, multi-purpose, universe, easy to use: vehicles entering Wormhole-area from any direction and going to any position of the diagonal far-corner area, need 4.5 times of red lights on average, no matter how large a Wormhole-class controlled area and how big the number of intersections in the area are, multiple-class-change based on Wormhole-class presents the functions of the fast inhalation of vehicle flow from omni-direction, :the fast spitting out of vehicle flow to omni-direction, the relieving jammed vehicle flow during spitting out to omni-direction, the relieving jammed vehicle flow during inhalation from omni-direction, the coordinating artery roads to quickly shunting vehicle flow, and also, the vehicles' going through an area by only 1 red light of Pulsar-class; this String Supermodes are determined by only about 20 of parameters, can switch rapidly with no redundance, provide an area-type traffic control, analysis, operation basic mode.
Owner:MENG WEIPING
Short-centimeter-waveband dual-polarized refrigeration receiver dewar
The invention relates to a 1.3-centimeter-waveband dual-polarized refrigeration receiver dewar used for observing molecular spectra lines, pulsar and VLBI (very long baseline interferometry) in the radio astronomy. The receiver dewar consists of a dewar cavity, a shielding cover, a microwave window, a frame carrier, a support, a ring-shaped fixing frame, a soft connector, a feed source, a transition waveguide, a circle and square converter, a polarizer, a low-noise amplifier, a waveguide coaxial converter, an isolator, a semi-rigid coaxial cable, a microwave window sealing film, a microwave window fastening ring, an air-filled cavity, an air-filled cavity sealing film, an air-filled cavity fastening ring, an air cylinder and a refrigerator. The 1.3-centimeter-waveband dual-polarized refrigeration receiver dewar with high sensitivity has the advantages that the design scheme is more reasonable, good sealing performance is ensured, internal devices can be well fixed and supported, the refrigeration effect is more excellent, the stability is better, the sensitivity is higher, and the thermal radiation can be effectively isolated, thereby being capable of being better applied to high frequence radiation characteristic study of molecular spectra lines and pulsar and radio astronomy observation of VLBI.
Owner:XINJIANG ASTRONOMICAL OBSERVATORY CHINESE ACADEMY OF SCI
System and methods for updating a reference time from a decaying rotational period of a pulsar
Disclosed is a system for updating a reference time from a decaying rotational period of a pulsar. The system can include: a database (DB) configured to store: coordinates for a pulsar; a recorded rate of rotation (RROR) for the pulsar; a rotational rate of decay (RROD) function for the pulsar; and a recorded reference time for the pulsar. A sensor can be configured to collect electromagnetic pulsar radiation from the pulsar and generate sensor data. A signal processor module can be configured to receive the sensor data, generate an observed rate of rotation (OROR) signal profile, generate a current rate of rotation (CROR) for the pulsar from the OROR signal profile, and update the RROR from the CROR. A time processor module can be configured to receive the RROD function and the CROR, and to solve the RROD function to output a reference time of the pulsar.
Owner:BOOZ ALLEN HAMILTON INC
Autonomous navigation method for libration point constellation
ActiveCN105547303ARealize autonomous navigationHigh speedInstruments for comonautical navigationNavigation by astronomical meansPulsarFilter algorithm
The invention provides an autonomous navigation method for a libration point constellation. The method basically comprises the steps of firstly, constructing the state equation of a spacecraft based on the dynamic characteristic of the spacecraft at the libration point; secondly, observing a pulsar through a detector on a spacecraft in the constellation, calculating the included angle between the base line vector of the two spacecrafts and the absolute direction vector of the pulsar with the relative time delay of a pulse signal arriving at the two spacecrafts as the measurement quantity, and constructing a system observation equation on this basis; finally, processing a libration point dynamical model and observation information by means of the filtering algorithm, and obtaining the position information and velocity information of each spacecraft through time updating information and measurement updating information. The problem that autonomous positioning of a libration point constellation is hard to achieve currently is solved, and autonomous navigation and positioning of constellations are achieved through pulsar observation.
Owner:NAT UNIV OF DEFENSE TECH
Method for building universal pulsar-based autonomous navigation measurement model
The invention provides a method for building a universal pulsar-based autonomous navigation measurement model. The method comprises calculating the geometric delay of a pulsar pulse signal, the physical delay of the signal, time coordinate transformation correction and double-star orbital motion delay, respectively, and then building the universal pulsar-based autonomous navigation measurement model and a pulsar-based autonomous navigation observation equation. According to the method for building the universal pulsar-based autonomous navigation measurement model, a brand-new pulsar-based navigation measurement model is provided, which is capable of theoretically reaching the calculation accuracy of 1ns; and meanwhile, the space motion velocity of the pulsar and the time delay effect of the impulsion double-star orbital motion are taken into account.
Owner:NAT TIME SERVICE CENT CHINESE ACAD OF SCI
Pulsar time synchronous device with high reliability
InactiveCN102759885AWith fault self-diagnosis functionSynchronous motors for clocksSetting time indicationPulsarRubidium
The invention discloses a pulsar time synchronous device with high reliability, which includes an x-ray detector, a signal conditioner, a first rubidium atomic clock, a second rubidium atomic clock, a third rubidium atomic clock, a failure diagnosis module, a change-over switch, frequency dividers, time interval measurement modules and a CPU, wherein the first, the second and the third rubidium atomic clocks are connected with the failure diagnosis module, and are connected with the change-over switch respectively; the failure diagnosis module includes the frequency dividers in three groups and the time interval measurement modules, and is connected with the CPU; one way of the change-over switch is connected with the frequency dividers, and the other way of the change-over switch serves as the frequency standard of other spaceborne equipment; each frequency divider is connected one input end of each time interval measurement module; the x-ray detector is connected with the signal conditioner; the signal conditioner is connected with the other input end of each time interval measurement module; the time interval measurement modules are connected to the CPU; and the CPU is connected with the change-over switch as well as the first, the second and the third rubidium atomic clocks. The device has the advantages of high accuracy and reliability, is endowed with the failure autodiagnosis function, and greatly improves the automatic navigation capability.
Owner:XI AN JIAOTONG UNIV
Optical and pulsar fusion type self-navigating method based on observability analysis
ActiveCN103017772AImprove navigation accuracyReasonable configurationInstruments for comonautical navigationPulsarNavigation system
The invention provides an optical and pulsar fusion type self-navigating method based on observability analysis. The optical and pulsar fusion type self-navigating method comprises the following steps of firstly, mounting an optical sensor and a pulsar sensor on a detector to respectively detect a gazing direction of a single asteroid and time that pulse reaches the detector; secondly, respectively establishing an observation equation of optical navigation and an observation equation of pulsar navigation, and combining the observation equations to be an observation equation of a fusion navigation system; and finally, selecting an asteroid capable of being detected and a pulsar as measurement navigational stars, and calculating a navigation position and a navigation speed by using standard Kalman filtering.
Owner:BEIJING INST OF CONTROL ENG
Aircraft navigation method based on earth high orbit-earth and moon libration point heterogeneous constellations
ActiveCN106767845ARealize autonomous navigationOvercome the lack of navigationInstruments for comonautical navigationPulsarUltrasound attenuation
The invention provides an aircraft navigation method based on earth high orbit-earth and moon libration point heterogeneous constellations. The aircraft navigation method comprises the following steps of firstly, utilizing a pulsar detector and intersatellite ranging observing equipment to obtain the corresponding pulsar and intersatellite ranging observing amount, so as to realize the autonomous navigation of the earth high orbit-earth and moon libration point heterogeneous constellations; after the heterogeneous constellation realizes the autonomous navigation, arranging the intersatellite ranging observing equipment on the aircraft, and observing the heterogeneous constellations to obtain the corresponding position information; using a corresponding navigation method to determine the self position and speed, so as to realize the autonomous navigation of the aircraft. Compared with the navigation method based on a ground measuring and controlling system, the aircraft navigation method based on the heterogeneous constellations has the characteristics that the communication delay is little, the signal attenuation is little, the positioning accuracy is high, and the navigation efficiency is high.
Owner:NAT UNIV OF DEFENSE TECH
Large-view-field X-ray navigation sensor based on lobster eyes
InactiveCN104697527ARich navigation informationReduce dependenceInstruments for comonautical navigationPulsarElectronic systems
The invention relates to a large-view-field X-ray navigation sensor based on lobster eyes. The sensor comprises a lobster eye optical system which reflects X-rays incident from a pulsar in a grazing mode and gathers photons of the X-rays to the sphere surface or hemisphere surface with the radius of R / 2, and a sphere surface detector is arranged at the position to detect the photons of the X-rays and measuring arrival time of the photons; an electronics system carries out time accumulation on the photons of the X-rays to form a pulse outline, and compares the pulse outline with a standard pulsar database to obtain target characteristic information of the pulsar for data processing and solving so that navigation information can be obtained. The sensor overcomes the defect that a traditional Wolter type X-ray navigation view field is small, the requirement for long-time, large-view-field and high-precision autonomous navigation is met, and rich navigation information about time, positions, speed and the like can be provided for spacecrafts in near-earth orbits, deep space and interstellar space.
Owner:SHANGHAI XINYUE METER FACTORY
Ground, aviation integral autonomous navigation system design method
InactiveCN101285687AExert autonomyImproving timely processing abilityInstruments for comonautical navigationPosition fixationAviationInformation integration
The invention discloses a ground-space-sky integrated autonomous navigation system design method, which is an autonomous navigation system design method that can be applied to the whole process of launching aircrafts from the ground to the deep space for detection. A system at least comprises a pseudo satellite, a pulsar, a ground main control station, an aircraft, etc. The system is combined with an on-orbit operating GPS or Chinese 'Beidou' satellite so as to be integrated into an autonomous navigation positioning system as a whole. The method prospectively fuses the pulsar which is a stable signal source still in physical concepts into the technical category of deep space integrated autonomous navigation. The method systematically solves the integration requirements of the autonomous navigation of deep space aircrafts, effectively realizes the information fusion of a variety of high technology application, and satisfies the high-precision autonomous navigation application of aircrafts in deep space detection activities. Meanwhile, the method is also a new exploration for the expanding study and system method of ground navigation positioning application.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Pulsar signal detector based on single event effect
InactiveCN102175248AAvoid structural designMiniaturizationInstruments for comonautical navigationPulsarProcessor register
The invention discloses a pulsar signal detector based on single event effect, relating to the technical field of data processing and solving the problems of support defect of low-pressure high-vacuum and low-temperature environment and overlarge detection area of the traditional detector. The pulsar signal detector comprises a register unit array comprising M+1 register units and an adder array comprising M adders, output ends of the first register unit and the second register unit are respectively connected with the first input end and the second input end of the first adder, the output end of the first adder is connected with the first input end of the second adder, the output end of the third register unit is connected with the second input end of the second adder, the carry output end of the first adder is connected with the low-level carry input end of the second adder, by suck analogy, the output end of the mth adder is connected with the first input end of the (m+1)th adder, the output end of the (m+2)th register unit is connected with the second input end of the (m+1)th adder, and the carry output end of the mth adder is connected with the low-level carry input end of the (m+1)th adder, wherein m is more than 1 and less than M; and the output end of the Mth adder is used as a final result output end. The invention is applied to detecting pulsar signals navigated by spacecrafts.
Owner:HARBIN INST OF TECH
Method for quickly calculating arrival time of pulse signal based on sector search
ActiveCN104535067AImprove navigation response speedSmall amount of calculationNavigational calculation instrumentsInstruments for comonautical navigationPulsarArrival time
The invention provides a method for quickly calculating arrival time of a pulse signal based on sector search. The method comprises the steps that firstly, a unimodal section is searched for after a likelihood function is established according to the step size of an initial phase; secondly, a unimodal section is searched for after a likelihood function is established according to the half of the step size of the initial phase, and if the results of the two times of search are the same, the maximum value and the minimum value of the likelihood function in each unimodal section and corresponding phases are searched for, and the phase corresponding to the maximum value is the phase corresponding to the arrival time of the pulse signal of a pulsar; finally, the pulse arrival time is obtained according to the product of the phase and the period of the pulsar signal. Compared with a grid search method, the method has the advantages that by means of the strategy of distinguishing the unimodal sections and solving the maximum values and the minimum values of the likelihood functions of the unimodal sections, the calculated amount is effectively reduced, the calculation cost is saved, and the navigation reaction speed of a spacecraft is increased.
Owner:NAT UNIV OF DEFENSE TECH
Method for eliminating interference of broadband time domain in pulsar arrival time data
The invention relates to the technical field of astrophysics, and in particular relates to a method for eliminating the interference of a broadband time domain in pulsar arrival time data. The method comprises the following steps: observing a pulse signal of a pulsar, obtaining a periodical pulse outline of the pulsar, eliminating a dispersion delay of the periodical pulse outline of the pulsar, observing broadband radio interference in the pulse signal data of the pulsar, and eliminating the interference of the broadband time domain in the pulsar arrival time data. By utilizing the correlation of the broadband time domain interference, the broadband time domain interference is eliminated by virtue of channel subtraction so as to eliminate the broadband time domain interference in the pulsar observation data, a real pulsar outline is obtained, the precision of the pulsar arrival time is improved, and the observation and research of the pulsar arrival time can be more reliably guaranteed.
Owner:XINJIANG ASTRONOMICAL OBSERVATORY CHINESE ACADEMY OF SCI
Navigation system and method using modulated celestial radiation sources
Owner:UNIV OF MARYLAND
Magnetized pulsar ring, and rolling bearing device with sensor using the same
InactiveUS20080218161A1Reduce the differenceRelieve stressEngine sealsRolling contact bearingsPulsarElastomer
A magnetized pulsar ring of the invention is a pulsar ring fixed to an outer peripheral surface of a supporting member and including a ring body in which a number of magnetic poles are at predetermined intervals in a peripheral direction. The ring body 11a is formed of a plastic magnet, and has a cushion member made of an elastic body that is interposed between the ring body and the outer peripheral surface.
Owner:JTEKT CORP
Method and system for VLBI measurement based on X-rays and ground verification device
ActiveCN106643702AHigh measurement accuracyShorten baseline distanceInstruments for comonautical navigationNavigation by astronomical meansPhoton detectionX-ray
The invention provides a method and system for VLBI measurement based on X-rays and a ground verification device. The pulsar angular position can be accurately measured while a parallax range is greatly shortened. The measurement system comprises two paths of parallelly set X-ray single photon detection systems and a self-correlation processor for performing strength relevance calculation on two paths of measured signals, wherein each path of X-ray single photon detection system comprises X-ray focusing optical modules, X-ray single photon detectors, time compensation cables, a front end electronics module and a data processing module which are arranged sequentially. The displacement set by the difference of initial positions of the two paths of X-ray focusing optical modules and the X-ray single photon detectors in the optical axis direction makes a set optical path difference exist when the same light source enters the two paths of X-ray single photon detectors, and initial alignment of time sequences of output signals of the two paths of X-ray single photon detectors can be performed through different configurations of the time compensation cables.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Pulsar photon timing method based on APD detector
ActiveCN106773615AImprove detection efficiencyIncrease energy resolutionTime interval measurementPulsarHigh energy resolution
The invention discloses a pulsar photon timing method based on an APD detector. An APD is used for realizing detection on weak pulsar photons of 0.5keV to 10keV. On one hand, the pulsar photon timing method has the advantages of high detection efficiency, rapid response time, high energy resolution and the like; on the other hand, photon-generated carriers in the detector are drifted along a pn junction direction; time jitter caused by the detector is relatively small, so that the pulsar photon timing method is very suitable for pulsar photon timing; a constant-ratio timing and single threshold value triggering method is adopted, so that noises are inhibited, and furthermore, an amplitude movement effect caused by different X photon energy is eliminated; advantages that a GPS (Global Positioning System) second pulse signal is long and stable and an atomic clock is short and stable are combined, and long and stable and high-precision clock frequency is output through a correction principle; TDC (Time-Digital Convert) timing precision is kept; furthermore, pulsar photon timing errors are reduced.
Owner:SHANDONG INST OF AEROSPACE ELECTRONICS TECH
A pulsar recognition method based on convolution neural network
InactiveCN109272026AThe process of avoiding artificially designed featuresSave time and costCharacter and pattern recognitionPulsarNetwork model
The invention relates to a pulsar identification method based on a convolution neural network, belonging to the pulsar identification technical field. The invention iteratively trains the sample training set through the convolution neural network, thereby realizing the recognition of pulsars by using the trained convolution neural network model. The method converts the problem of pulsar recognition into the problem of image recognition and classification, which can identify pulsars quickly and accurately. Moreover, the method can maximize the use of more pulsar features, avoid the process of traditional manual feature design, greatly save time and cost, has real-time and simplicity, and is easy to be popularized and applied in practice.
Owner:KUNMING UNIV OF SCI & TECH
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