35results about How to "Good anti-interference characteristics" patented technology

A beacon arranging and image processing method based on UAN (unmanned aerial vehicle) pose calculation comprises the steps as follows: firstly, machine vision guiding landing of an UAN is designed, under the conditions of guarantee of the image sensitivity and analysis of the field distortion, a beacon structure and arranging method required by vision guiding landing is designed according to a built vision imaging system in combination with poses possibly occurring in the landing process, then, three indexes for measuring algorithm applicability are proposed to evaluate and screen pose solution algorithms for different cooperation beacon configurations according to a designed visual guiding system, and finally, adopted ground cooperation beacons are infrared LEDs which have more stable imaging effect, longer imaging distance and higher imaging precision. The method is simple and feasible and has the low landing field configuration requirement, features can be extracted from near infrared images more conveniently and quickly, the application range of the visual system is enlarged, and all-day and all-weather detection and recognition can be realized; the UAN pose information can be solved precisely.

The invention discloses a speed tracking control method for achieving a stable flight of an airship according to a given speed. The method comprises the steps of generating a forward flight velocity measurement and speed error signal; forming an error-based nonlinear gain entry; measuring a vertical velocity, a pitch angle and a pitch angle rate and building an adaptive term; designing an airship speed tracking control law; approximately simulating the characteristics of an airship pitching channel according to a mathematic model built by the differential equation of the airship pitching channel; and observing data of various states of the airship and drawing a picture by continuously adjusting control parameters, observing a data curve of a transverse flight speed of the airship and analyzing a response effect of constant-speed tracking control, thereby finally determining a group of airship control parameters, and enabling the speed tracking control of the airship to have satisfied dynamic response performance and steady-state response performance.

The invention relates to a multiscale compressed sensing progressive coding method of an ROI. The method comprises the steps that ROI detection is carried out on an original image; WBCT decomposition is carried out a detected ROI, a transitional zone and a background, multiscale compressed sensing measurement is carried out on the detected ROI, the transitional zone and the background, and ROI advance coding is carried out on the measured values; and if the ROI is not discovered, WBCT decomposition and multiscale compressed sensing measurement are carried out on the original image, and progressive coding is then carried out. According to the method, the image is compressed in the multiscale compressed sensing technology, so that progressive coding of the image is realized; the method is excellent in anti-interference performance due to compressed sensing measurement; and compared with compressed sensing, multiscale compressed sensing can maintain more information including image texture and edges under the same compression ratio.

The invention belongs to the technical field of electromagnetic switches, and discloses a dielectric array switch. The switch comprises a pedestal, a medium array composed of M*N dielectric cylindersand arranged on the pedestal and heating components arranged at two sides of the dielectric array; the portion among the dielectric cylinders of the dielectric array is filled with a substance with alow melting point and strong liquidity after melting; when the dielectric array switch works, an incident wave is emitted from the direction parallel to the pedestal to heat the filler; when a heatingtemperature reaches the melting point of the filler, the filler is melted, the filler among the dielectric cylinders is environmental gas, so that dielectric constants of cylinder bodies of the dielectric cylinders are changed, transmissivity of the dielectric array switch to a electromagnetic wave of a certain wave band is changed, and the switch functions that the electromagnetic wave is allowed to pass through or is cut off are achieved; the dielectric array switch can prevent external electromagnetic waves from passing through, cannot be affected by external electromagnetic wave interference, and has good anti-interference performance, is applicable to communication wave bands and infrared wave bands, is extremely wide in application wavelength coverage, has significant switch performance, and is high in stability.

The invention provides an impeller-type flowmeter flow high-speed sampling sensor to solve the problem that conventional sampling sensors are short in detecting distance, poor in diamagnetism and inaccurate in measuring. The impeller-type flowmeter flow high-speed sampling sensor mainly comprises a high-speed sampling probe and a sensor controller, a coil, a coil support and a protecting support are arranged in the high-speed sampling probe, and the sensor controller comprises a power-source power supply device, a radio wave generating device, a raid wave receiving device, a sampling recognition device, an edge steep pulse generating device, a sampling signal converting device and a sensor signal outputting device. The impeller-type flowmeter flow high-speed sampling sensor is suitable for various impeller-type flowmeters to realize high-speed measuring, and has the advantages of micro power consumption, wide voltage, good temperature characteristic and voltage resistance, excellent output signal and the like; in addition, the impeller-type flowmeter flow high-speed sampling sensor is free of any resistance on an impeller, long in detecting distance, good in resistance to ferromagnetism and accurate in measuring, and different shells can be chosen for different purposes.

The invention discloses a DLP signal receiving system suitable for the laser radar and an adaptive adjustment method of the DLP signal receiving system. A laser emitter emits laser signals outwards through a laser scanning mirror, so laser scanning regions are formed. A DLP signal receiver carries out signal acquisition on scanning points of the laser scanning regions, and comprises multiple DLP micro-mirrors arranged in a matrix manner. The laser reflection signal of each scanning point is tracked and received by more than one DLP micro-mirror in the DLP micro-mirrors arranged in the matrix manner. The laser emitter and the DLP signal receiver are arranged in an integrated manner or in a neighboring manner. The DLP micro-mirrors arranged in the matrix manner are used for synchronously tracking and receiving laser reflection signals of the laser radar scanning regions, deflection of the DLP micro-mirror arrays and synchronization of scanning of the laser radar are controlled, and imaging regions of the scanning target reflection signals are selectively projected to a photoelectric sensor, so the signal to noise ratio for increasing the laser reflection signals of the laser radar scanning regions can be increased and better anti-interference characteristics are achieved simultaneously.

The invention discloses a digital communication method based on combination of DSSS spreading operation and LDPC decoding. The method comprises the following steps that S1) a sending end extracts a data frame that needs sending; S2) the sending end codes the extracted data information in an LDPC coding manner; S3) the sending end spreads the spectrum of the coded data in a DSSS manner; S4) the sending end sends data after spectrum spreading to a receiving end via a power line; and S5) the receiving end processes the received data. To enable LDPC decoding to obtain a more accurate initialization probability, reduce the cost, and prevent memory from processing floating points, related operation is carried out on the received DSSS signals via LDPC encoding and local PN codes after 1-bit A/D conversion, a result serves as input of an LDPC decoder without hard decision, and a final result is output via decoding and soft decision. The communication method has the advantages of high DSSS anti-interference feature, high LDPC error correction capability, simple circuits and low cost.

The invention relates to the field of environmental geotechnics, and particularly relates to an ultra-hysteresis dipole transverse wave source in the field of engineering geophysical logging. The ultra-hysteresis dipole transverse wave source is characterized by comprising an emitter and a receiver, wherein a sound insulation pipe is arranged between the emitter and the receiver; the shell of the emitter and the shell of the receiver are internally respectively provided with two ultra-hysteresis plates which are made of ultra-hysteresis materials and are consistent in direction and identical in specification; and coils which are wound in the opposite direction and has the same turns are arranged on the two ultra-hysteresis plates. The ultra-hysteresis dipole transverse wave source provided by the invention has the advantages of small volume, wide bandwidth, large transmitting power, favorable anti-interference characteristic, favorable signal repeatability, short aftershock, long penetrating distance and the like, and is convenient for installation and suitable for the operation of the transverse wave logging in the field of the environmental geotechnics. The emission frequency of the ultra-hysteresis dipole transverse wave source can be adjusted according to the external voltage.

An interference-resistant structure of a Wlan antenna comprises an antenna cover, a dielectric plate, a planar slot antenna, a feeding microstrip, a metal bottom plate and a feeding connector.

The invention discloses a magnetic molecularly imprinted electrochemical sensor and a preparation method and application thereof. The preparation method of the magnetic molecularly imprinted electrochemical sensor comprises the following steps of: S1, fully grinding carbon powder, paraffin oil and a methotrexate magnetic molecularly imprinted polymer to obtain homogeneous magnetic molecularly imprinted carbon paste powder; S2, filling a carbon paste electrode with the magnetic molecularly imprinted carbon paste powder prepared in the step S1 as a filler, and polishing the surface of the electrode on smooth weighing paper to obtain a magnetic molecularly imprinted carbon paste electrode; and S3, preparing a magnetic molecularly imprinted electrochemical sensor by taking the magnetic molecularly imprinted carbon paste electrode prepared in the step S2 as a working electrode. The electrochemical sensor prepared by utilizing the preparation method disclosed by the invention has better specific recognition on methotrexate, and also has better anti-interference characteristic on structural analogues of methotrexate, such as trimethoprim, metsulfuron-methyl and folic acid.