943results about How to "Less susceptible to interference" patented technology

A positioning unit and telecommunications unit wherein a reference time value from is requested from a telecommunications network to start the positioning receiver. A strobe is scheduled to be transmitted from the telecommunications unit to the positioning receiver when the positioning receiver is armed. A current and predefined value of the counter is compared and the strobe is generated when the counter current value equals the predefined value. The strobe time of generation is recorded in relation to a structure of the signal transmitted by the digital telecommunications network in the current serving cell. The reference time value from the telecommunications network is received, wherein the reference time value is related to a structure of the signal transmitted by the network. The accurate time of generation of the strobe based on said reference time value is calculated transmitted to said positioning unit.

A system for predicting the movement of a surface for autonomous landing of unmanned aerial vehicles thereon. At least two beam emitters are each movable to measure along at least one line on the surface. The lines measured by the two beam emitters are crossed so that they have at least one point of intersection in common. A control module. A detector is configured to detect reflected beams. A processor is configured to process measurements including estimating continuously a plane to the surface by measurements during a time interval. A storage module is configured to store the processed measurements.

The invention discloses a dynamic signal demodulation method for a fiber laser sensor. A sensing system is established, and comprises a beat frequency signal generation part and a signal demodulation part. The beat frequency signal generation part generates a beat frequency signal and receives a dynamic signal through a sensing probe; the original beat frequency signal is demodulated into a frequency modulation (FM) signal by the dynamic signal; the FM signal is input into the signal demodulation part and demodulated by an FM demodulator to form a modulation signal, namely, the dynamic signal; and the modulation signal is subject to analogue-digital (AD) conversion through an AD data acquisition card and then processed by a digital processing circuit to obtain the frequency and acceleration parameters of the dynamic signal. Through the invention, the dynamic signal demodulation method is free from influence of light-intensity variation, electromagnetic interference and the like; and compared with the known fiber dynamic demodulation method, the dynamic signal demodulation method is easy to implement and ensures stable and reliable operation and low cost.

The invention provides a natural background video sectional drawing method. The method comprises the steps that 1) the method automatically selects a key frame, specifically the method automatically selects the key frame in a video by calculating inter-frame difference; 2) a key frame Trimap map is generated, specifically a user us allowed to provide useful information through a small amount of manual interaction and a GrabCut segmentation algorithm and a Gaussian blur method are used to semi-automatically generate the Trimap map on the key frame; 3) a middle frame Trimap map is generated, specifically bidirectional optical flow propagation is used to generate the Trimap map of each middle frame, and color, gradient and other information are used to correct errors generated by optical flow propagation; and 4) according to the Trimap maps of all video frames and a Bayesian sectional drawing algorithm with added three-dimensional space-time optimization, the alpha mask map of each frame of the video is calculated, and the alpha mask map and a new background are synthesized to acquire a new synthesized video. According to the invention, the method has the advantages of fast speed and less user interaction, and the finally acquired new synthesized video has the advantages of good time coherence, high reality and the like.

The invention discloses an ultrasonic ranging method, belonging to the technical field of electronic measurements. The ultrasonic ranging method comprises the following steps that: an ultrasonic transmitter and a pulse laser are located at a transmitting end, the transmitting end receives a measuring command, subsequently, the pulse laser triggers a beam of pulse laser and the ultrasonic transmitter triggers an ultrasonic wave at the same time, and phase locking is carried out on the triggered ultrasonic wave and an external clock source; an ultrasonic receiver and a photodiode are located at a receiving end, after the photodiode receives the pulse laser, a timer is started, after the ultrasonic receiver acquires the received ultrasonic wave, the timer is stopped to acquire transition time; the transition time multiplies by a revised sound velocity to acquire a rough measurement value of a measured distance; and a phase difference is obtained, a fine measurement part is lambda delta omega/2phi, and an actually measured distance d' is acquired, wherein d'=Nlambda+lambda delta omega/2phi. The ultrasonic ranging method has the advantages that the receiver is easily interfered by the transmitter, a measurement blind zone is greatly reduced, the ultrasonic distance measuring directivity is improved, the distance measuring precision is improved within one ultrasonic wavelength; and the ultrasonic ranging method is particularly suitable for distance measurement in a single station type space orientation and measurement system.

The invention discloses an optical fingerprint recognition device and a display device. The optical fingerprint recognition device comprises a light source, a light guide plate, a first volume grating, a second volume grating, and a light detector. The light guide plate comprises two parallel light guide surfaces. The first and second volume gratings are located on the light guide surfaces of the light guide plate. The light source is located at one side, backing on to the first volume grating, of the light guide plate. The light detector is located at one side, backing on to the second volume grating, of the light guide plate. During fingerprint recognition, a detected finger makes contact with the light guide surface of the light guide plate, and the light detector recognizes the fingerprint of the detected finger through detecting the light intensity distribution of the light from the second volume grating. Because the reflection light in the light guide surfaces is much higher in intensity than the diffuse reflection light of the finger and is not liable to be affected by the external light and the difference, corresponding to the ripples of the fingerprint, of the reflection light is more apparent, the device employs the reflection light of the light guide surface making contact with the finger for determining the light intensity distribution corresponding to the fingerprint, so as to achieve the higher accuracy of fingerprint recognition.

The invention provides a method for detecting the stability of the gas tungsten arc welding (GTAW) additive manufacturing process based on arc voltage feedback. The method comprises the steps that the stability of the process is reflected through the arc length, the arc length is indirectly fed back though arc voltage, and the initial position of a GTAW gun on a substrate is adjusted; in the forming process of a first layer, a voltage sensor is matched with a data acquisition card to obtain a variation signal of the arc voltage along a forming path; the arc voltage is converted into the arc length according to a calibration relationship, a variation signal of the arc length along a forming path is obtained, and a second layer, a third layer until the n layer are formed, so that a variation signal of the n layer arc length along a forming path is obtained; and if the arc length is within a certain range, it is judged that the forming process is stable. According to the method for detecting the stability of the GTAW additive manufacturing process based on arc voltage feedback, the purpose of real-time detection of the stability of the GTAW additive manufacturing process is effectively achieved, and the detection process is easy to operate, high in stability, not prone to being interfered by intense arc light, high in calculation speed, capable of achieving automation easily and suitable for engineering application of real-time site detection.

The invention relates to a device or a method for detecting rain (4), said device or method comprising a camera (1) and a lighting source (3). The camera (1) is disposed behind a pane (2), in particular in the interior of a vehicle behind a windscreen, and focused onto a far range that lies in front of the pane (2). The lighting source (3) for generating at least one light beam (h; n) that is directed at the pane (2) directs the at least one light beam (h; n) towards the pane (2) such that at least one beam (r2; r2′) that is reflected from the outer face (2.2) of the pane impinges on the camera (1).

The light quantity of the at least one beam (r2; r2′) that impinges on the camera (1) can be measured by the camera (1).

Disclosed is a composition capable of imparting high hardness, abrasion resistance, excellent contamination resistance and durability of such contamination resistance even in the form of a thin film. Specifically disclosed is a composition including an organic polymer containing 5-30% by mass of a radically polymerizable monomer with a perfluoroalkyl group, 0.01-5% by mass of α,ω-dimercaptopolysiloxane, 5-40% by mass of a radically polymerizable monomer with a cationically photopolymerizable epoxy group and 25-75% by mass of another radically polymerizable monomer which is copolymerizable with the aforementioned substances. The organic polymer has a structure corresponding to a radically polymerized copolymer of the monomer mixture wherein the molar ratio of the mercapto group to the epoxy group is 0.0001-0.025 and/or a structure obtained by reacting a (meth)acrylic acid with the epoxy group of the radically polymerized copolymer.

The invention belongs to the field of bionic polarized light navigation, and discloses a solar azimuth acquisition method based on atmospheric polarization modes. Firstly, an image type polarized light sensor is utilized to measure the atmospheric polarization modes, including a polarization angle mode and a polarization degree mode; secondly, according to the polarization angle mode, an optimization equation for a solar direction vector is created, the optimal estimation of the solar direction vector is implemented by solving eigenvectors of a matrix , and a projection of the solar direction vector is a solar azimuth; meanwhile, a gradient is worked out after the polarization degree mode is smoothed, the solar meridian is estimated according to the probability density distribution of a gradient direction, and thereby a solar azimuth can be obtained; and finally, results of the two methods are comprehensively weighted, so that an optimal estimation of the solar azimuth is obtained. Under the condition of not adding hardware structures, the invention sufficiently utilizes information contained in the polarization angle mode and the polarization degree mode to estimate a solar azimuth, and has the advantages of simple principle, high estimation precision and good robustness.

The invention relates to a method for determining the content of blood ammonia, and also the reagent kit for blood ammonia diagnosis. The reagent kit comprises cushioning solution, adenosine triphosphate, phosphoenolpyruvate phosphatase, deacidized type coenzyme, ammonia kinase, pyruvate kinase, lactate dehydrogenase, and stabilizer. By mixing sample and reagent of a predetermiend volumetric ratio, generating coupling reaction between them, subjecting the final reactant to biochemiscal analyser, the main wavelength absorbancy variance ratio (speed) can be detected, and the blood ammonia content can thus be measured. The method of the invention can be used to obtain the needed measurement result purely through biochemical analytic instruments, and advantages of the method include higher sensibility, better accuracy, less susceptibility to contamination of internal or external materials, and easy application.

The invention discloses a method for connecting a wireless device to a wireless access point and a wireless device, an intelligent terminal, the method is as follows: obtaining the configuration information of the wireless access point by the intelligent terminal; packaging the configuration information into the data frame, modulating the voice frequency to the data frame to obtain the continuous audio signal, playing the continuous audio signal through the self pronouncing device; receiving the audio signal by the wireless device having the distance to the intelligent terminal less than the preset distance through the self sound receiving device; demodulating the audio signal to obtain the data frame, extracting the configuration information from the frame; using the configuration information to connect to the wireless access point. The technical scheme can solve the problems that the access error is generated while the wireless device without human-computer interaction interface is connected to the AP, the cost is increased and the operation is complex. The continuous audio signal is adopted for transmitting the wireless AP configuration information, in the practical operating environment, the interference of the background noise can be avoided and the anti-jamming capability for transmitting the configuration information is strengthened.

The invention relates to a connection establishment method, terminal and device and belongs to the technical field of communication. The method includes the steps that connection information used for communication connection is preset, and the connection information at least comprises a second terminal identification, a connection password and point-to-point communication information; the connection information is provided for a first terminal. According to the connection establishment method, due to the fact that the connection information used for communication connection is preset and comprises the second terminal identification, the connection password and the point-to-point communication information, afterwards, the connection information is provided for the first terminal, and connection with the first terminal is established according to the connection information. Due to the fact that the first terminal and the second terminal are connected through the connection information and the connection password does not need to be negotiated by sending an air interface package, consumed time is short in the connection process, the connection efficiency is higher, and connection is not likely to be interfered by external environments and is more stable.

The invention discloses a transverse track irregularity detecting method based on an observer, which belongs to the technical field of track dynamic detection. The method comprises the following steps of: first, mounting a transverse acceleration sensor, a yaw angle measuring instrument or a gyroscope at the center of a bogie, so as to respectively measure transverse acceleration and yaw angular speed of the bogie in the train operation process; meanwhile, mounting a transverse acceleration sensor at the center of a train body bottom plate so as to obtain a train body transverse acceleration; and then carrying out relevant pre-processing, such as isolation, analogue-to-digital conversion, digital filtering and the like, on an analogue signal collected by a sensing device; and carrying out dynamics modeling on a train transverse suspension system by using the data to construct a transverse track irregularity estimating system, so as to detect the transverse track irregularity. The transverse track irregularity detecting method based on the observer, disclosed by the invention, belongs to an in-transit detecting method and has the advantages of stronger detection timeliness, simple structure of a detecting unit, uneasiness for being interfered by outside factors, high device reliability and low cost.

The invention discloses a high-precision remote time synchronization method. A high-precision time synchronization system, a main station (1) and auxiliary stations are built to carry out time comparison and the auxiliary stations are used for forecasting local time differences. Thus, time synchronization of the main station (1) and a single auxiliary station is completed. All the auxiliary stations and the main station (1) sequentially undergo circulating comparison and time different forecasting and eventually, time synchronization of the auxiliary stations and the main station is achieved. The technology of satellite double-direction time comparison and combination of time division comparison and time difference forecasting is utilized, real-time nanosecond-class time synchronization among stations is achieved, the system is independent and not prone to interference and various defects based on a GPS time synchronization method are effectively overcome.

The invention is about a method of measuring the content of blood ammonia, and it also concerns the reagent box of blood ammonia diagnosis. This invention belongs to the field of medical testing and measuring technology. The reagent box is consisted of buffer solution, 2ú¡ketoglutarate, reduced coenzyme, adenosine triphosphate, phosphoenolpyruvate, glutamate dehydrogenase, glutamate kinase, pyruvate kinase, lactate dehydrogenase and stabilizer. Firstly, we cause an enzyme-coupled reaction through mixing the sample and the reagent according to a certain proportion of volume; secondly, put the final reactant under the biochemical analyzer and test the absorbance variational situation (speed) of dominant wavelength; then we can get the content of blood ammonia. By using this invention, we can get the necessary measuring result with high sensitiveness and fine precision through biochemical analyzer, and the result would not be contaminated by material of internal and exogenous sources. Thus, this method can be conveniently promoted and applied.

The invention discloses a method and a device for positioning an iris image. The method comprises the following steps: carrying out rough pupil positioning on the iris image; initializing coordinates of a plurality of key points based on rough positioning; extracting SIFT feature vectors of the key points; using an SDM algorithm to map the SIFT feature vectors of the key points into a coordinate increment; using the coordinate increment to update coordinate values of the key points; and using a robust regression method to carry out curve fitting on the key points to obtain parameters of an upper eyelid parabola, a lower eyelid parabola and an iris excircle. Compared with the prior art, the method for positioning the iris image disclosed by the invention is simple, convenient, high in speed, strong in anti-interference ability, high in precision, high in generalization performance and good in robustness.

The present invention is directed to a combustion-operated setting device for driving fastening elements such as nails, bolts and pins into a substrate, with a setting mechanism comprising a driving piston (15) which is supported to be displaceable in a guide, and with an electronic monitoring device for monitoring the status of the setting device. At least one sensor array (21, 22) is arranged at the guide for generating a measurement data pattern which can be evaluated by the monitoring device.

The embodiment of the invention provides a method, device and system for measuring a crowding degree. A terminal samples the signal strength value of access point in an access point coverage area, calculates out mathematical statistical parameters, measures and calculates the distance from an current sampling location to the access point, and informs a server of the distance and the mathematical statistical parameters; the server obtains the distance and the mathematical statistical parameters, an objective function is chosen in a crowding degree corresponding relation table according to the distance and the mathematical statistic parameters, and the crowding degree grade corresponding to the objective function is used to indicate the crowding degree in the access point signal coverage area. According to the method, device and system for measuring a crowding degree, the signal strength of the access point is collected at once, the crowding degree within the space is evaluated through the crowding degree corresponding relation table, image acquisition of the location of each person is not needed, complex computing is needless, the measurement can be achieved only through the terminal carried by the user, extra hardware need not to be arranged, and the cost is reduced.