250results about How to "Anti-jamming" patented technology

The present invention provides a LoRa-based wireless communication system and belongs to the wireless communication technological field. The system comprises a controller and a LoRa gateway; the LoRagateway and a plurality of LoRa direct nodes form a star network; and each LoRa indirect node is indirectly connected into the LoRa gateway with one LoRa direct node adopted as a relay node. Accordingto the LoRa-based wireless communication system of the present invention, the LoRa wireless technology is adopted, and such communication technology has the characteristics of long communication distance, anti-interference performance, low power consumption and the like, so that the communication technology can adopt the star network architecture, and therefore, the complexity of the system is reduced, and power consumption is reduced; an intelligent node management algorithm can ensure that wireless channels do not conflict with each other; and on the basis of the LoRa wireless technology and the algorithm, a relay function is additionally adopted, and therefore, a transmission distance can be increased manyfold with the real-time performance of data transmission ensured, the wireless diffraction capability of the system can be enhanced, and long transmission distances can be still ensured in complex environments.

The invention relates to a multi-input and multi-output selectivity OFDM underwater sound communication system and a method thereof, having the advantages of resisting multi-path interference, resisting frequency selectivity deep fading, improving the transmission rate of information and the like. The transmitter of the system comprises a space multiplexing unit, a plurality of spectrum spreading units, a subcarrier zero setting unit, a plurality of OFDM modulation units, a multiple sonar transmitting unit and a communication channel estimation unit, wherein, the spectrum spreading units are connected between the space multiplexing unit and the subcarrier zero setting unit; the OFDM modulation units are connected between the subcarrier zero setting unit and the multiple sonar transmitting unit. A receiver comprises a multiple sonar receiving unit, a plurality of OFDM demodulation units, a communication channel frequency domain balancing unit, a plurality of dispreading units and space demultiplexing units, the OFDM demodulation units are connected between the multiple sonar receiving unit and the communication channel frequency domain balancing unit, the dispreading units are connected between the communication channel frequency domain balancing unit and the space demultiplexing unit, and the communication channel estimation unit is respectively connected with the subcarrier zero setting unit and the communication channel frequency domain balancing unit.

The invention relates to an intelligent home controller based on eye-movement tracking and an intelligent home control method based on eye-movement tracking, and belongs to the field of wireless control. The problem that the existing intelligent home controller adopts a press key or touch input mode, so that the existing intelligent home controller cannot be applicable to special user groups with limb obstacles. The intelligent home controller based on eye-movement tracking comprises an image collecting module, an image processing module, a communication module, an FPGA (Field Programmable Gate Array) module and a sub module, wherein the sub module is integrated inside an FPGA chip. The intelligent home control method based on the eye-movement tracking comprises the steps that: the image processing module performs binarization processing on collected face images; the human eye pupils and the light spot positions, displayed on the human eye scleras, of an infrared lamp are found out; the sight line direction of the human eye is estimated; and in a VGA (Video Graphics Array) liquid crystal display, the designed user interface and the user slight line position are displayed in the liquid crystal display screen by the image display module, and the human-computer interaction is realized. A non-contact control mode is adopted, so that the interference on users is reduced to the greatest degree, and the burden of the user is lightened.

The invention provides a preset control method for a thickness flying gauge change of a hot-dip zinc coating. The method comprises the following steps: with a strip steel speed, air knife pressure, and a distance between an air knife and the surface of strip steel as main influence factors and by applying a principal component analysis method, building a thickness preset model of the coating by using a least-square fitting algorithm of a log-log space; carrying out long-term self-adaption adjustment and short-term self-adaption adjustment on the thickness of the coating aiming at the effects of a variable speed, a target thickness and a strip steel substrate thickness on the thickness of the coating existing in the flying gauge change process; and carrying out online updating calculation on thickness model parameters of the coating by using a Kalman filtering algorithm and a smooth filtering algorithm in thickness control, so as to improve the preset accuracy of the model parameters. By adopting the preset control method, the control problems of overlarge thickness deviation of the coating and coating thickness detection lag caused by changes of the target thickness of the coating, the strip steel substrate thickness and the strip steel speed are solved; automatic preset control of the thickness of the zinc coating is achieved; the thickness deviation of the zinc coating is reduced; the thickness control accuracy of the zinc coating is improved; zinc consumption is reduced; the galvanization cost is also saved.

The invention discloses an underwater sound communication system, wherein a transmitter comprises an MIMO space multiplexing unit, a plurality of spectrum spreading units, a plurality of SC-FDE pretreatment modules and a plurality of transmitting sonars; a plurality of output ends of the MIMO space multiplexing unit are in one-to-one connection with the plurality of the spectrum spreading units; each spectrum spreading unit is connected to one SC-FDE pretreatment module; each SC-FDE pretreatment module is connected to one transmitting sonar; a receiver comprises a plurality of receiving sonars, a plurality of filtering detecting units, a plurality of SC-FDE modules, a plurality of dispreading units, and an MIMO demultiplexing unit; each receiving sonar is connected with one filtering detecting unit; each filtering detecting unit is connected to one SC-FDE module; each SC-FDE module is connected to one dispreading unit; and the plurality of the dispreading units are in one-to-one connection with a plurality of input ends of the MIMO demultiplexing unit. The system can resist multipath interface, improve frequency spectrum utilization ratio, channel capacity, information transmission rate and confidentiality, compensate Doppler frequency shift and reduce signal-to-noise ratio.

The invention discloses a device for measuring four-freedom-degree kinematic errors of a guide rail through non-diffraction light. The device comprises a laser device, a beam expansion collimating mirror, an axicon, a beam splitter prism, a reflecting mirror, a beam splitter, a rectangular prism and video cameras. A kinematic unit composed of the beam splitter and the rectangular prism is fixed to a working platform. Non-diffraction light beams reflected by the beam splitter are received by the first video camera, the non-diffraction light beams transmitted by the beam splitter and reference non-diffraction light beams are received by the second video camera, and by analyzing the change of the positions of center light of non-diffraction light in the two video cameras is analyzed, then the kinematic errors of the perpendicular straightness, the deflection angle, the pitch angle and the roll angle of the guide rail are recognized and measured. The device is simple in structure, large in measurement range, high in accuracy and stability, and good in overall performance, has the multi-freedom-degree measurement function and is a device for measuring multi-freedom-degree errors.

The machine consists of body frame, paper money feeding device, synchronous accelerating device, detection channel, conveying channel, steering gear, paper money impeller and belt receiving mechanism, paper money main and auxiliary receiving channel. The body frame comprises fixed frame and rotary frame; feeding mechanism comprises feeding desk, motor and wheel, friction wheel, separating wheel and auxiliary pressing wheel, synchronous accelerating device comprises feed and detection conveying wheel; conveying channel comprises conveying wheel, motor and channel; steering gear gear comprises steering wheel, shifting fork and motor, impeller mechanism comprises press wheel and impeller wheel and auxiliary and channel is below main one with belt mechanism.

The invention provides an endoplasmic reticulum-targeted two-photon nitroreductase fluorescent probe, wherein the chemical name is 4-nitro-N-(2-(4-methyl benzenesulfonamido)ethyl)-naphthalimide. The endoplasmic reticulum-targeted two-photon nitroreductase fluorescent probe is synthesized by the following steps: enabling ethylenediamine to completely react with paratoluensulfonyl chloride to obtain N-(2-aminoethyl)-4-toluenesulfonamide; enabling 4-nitro-1,8-naphthalic anhydride to react with the N-(2-aminoethyl)-4-toluenesulfonamide to obtain the endoplasmic reticulum-targeted two-photon nitroreductase fluorescent probe. The invention also provides application of the fluorescent probe in detecting nitroreductase activity in a solution and a biological body by use of single-proton or two-photon fluorescence. The probe synthesis method provided by the invention is simple and realizes high yield; the probe can be positioned on the endoplasmic reticulum to perform two-photon fluorescence detection on cells or tissues, and also has high sensitivity and can resist the interference of multiple interfering substances.

The invention discloses a preparation method for a heavy metal negative ion-removed porous nanometer composite fiber membrane. The preparation method comprises the following steps: dissolving a pore-foaming agent and a high-molecular polymer in an organic solvent; preparing a porous nanometer fiber membrane substrate through a high-pressure electrostatic spinning technology, synthesizing molybdenum disulfide nanoparticles with a hydrothermal method, uniformly mixing the molybdenum disulfide nanoparticles with a high-molecular polymer monomer, and adding a mixture into a strongly-acidic alcohol aqueous solution; under the action of an oxidizing agent, carrying out an in-situ polymerizing reaction to prepare the porous nanometer composite fiber membrane. The preparation method for the porous nanometer composite fiber membrane disclosed by the invention only needs to carry out three steps, has high yield, is easy to regulate and control, and is suitable for industrial production; heavy metal negative ions can be removed rapidly and efficiently within 30 minutes, so that the heavy metal negative ion-removed porous nanometer composite fiber membrane is 7mmol / g in maximum adsorption quantity, has high interference resistance, can be repeatedly used, and has a wide application prospect on the aspect of water environment pollution.

The invention discloses a space power divider / combiner. A disc-shaped air column lens adopts a metal disc-shaped parallel plate waveguide comprising an upper metal disc layer and a lower metal disc layer; upper and lower inner surfaces of the metal disc-shaped parallel plate waveguide adopt arc surfaces; a long side of a standard rectangular waveguide is perpendicular to the metal discs of the disc-shaped air column lens; a transition waveguide is in a horn mouth shape; one end of the transition waveguide is connected with the standard rectangular waveguide; the other end of the transition waveguide is intersected with the disc-shaped air column lens; an output end surface of a U-shaped output array is rectangular; an input end surface of the U-shaped output array adopts a semicircular arc surface matched with the disc-shaped air column lens; and a plurality of parallel metal baffles which are perpendicular to the metal discs of the disc-shaped air column lens are arranged in the U-shaped output array. The space power divider / combiner has high output power, wide frequency band and high combined efficiency, and has the advantages that the structure is simple, the processing accuracy requirement is low, the manufacture cost is low, the expansibility is high, heat emission is easy to realize, and the like.

The invention relates to a vortex-induced vibration test, measurement and analysis system for a deep-sea flexible riser model in the technical field of oceanographic engineering, which is characterized in that the system consists of an optical fiber grating sensor module, an optical fiber expanding slot, an optical fiber demodulator, a wireless transmission module and an optical signal data acquisition device which are sequentially cascaded with each other, wherein the optical fiber grating sensor module is connected with the riser module, the optical fiber expanding slot, the optical fiber demodulator, the wireless transmission module and the optical signal data acquisition device are arranged on a trailer, the optical fiber grating sensor module generates optical signals, the optical signals enter the optical fiber demodulator through the optical fiber expanding slot, the optical fiber demodulator demodulates the optical signals into digital signals, and the optical signal data acquisition device records, analyzes and stores the digital signals. The vortex-induced vibration test, measurement and analysis system for the deep-sea flexible riser model can realize the remote control acquisition of strain and stress situation generated by riser vortex-inducted vibration and can analyze and store the data in real time.

The invention discloses a distributed optical fiber monitoring system for tunnel surrounding rock deformation and construction and monitoring methods thereof. The monitoring system is composed of a first sensor, a second sensor, and an information system. The first sensor and the second sensor can be connected in series and then connected with the host interface of the information system to form a closed loop. According to the construction method, sensing fibers are symmetrically arranged in four grooves in the outer wall of a hollow circular pipe to form vertical and horizontal sensing loops, and sensors are embedded into pre-excavated trenches in the surrounding rock of a tunnel. According to the monitoring method, the vertical displacement distribution of the sensors can be calculated by performing differential and integral operations on the strain of the two fibers in the symmetrical first and second grooves of the hollow circular pipe. Distributed monitoring and real-time and advance monitoring are adopted. The data is stable and reliable. The cost is low. The monitoring system is suitable for dynamic real-time monitoring of the vertical and horizontal deformation of the surrounding rocks of existing highways under tunnels, tunnels, office buildings and other structures, and in influence areas of buildings.

The invention belongs to the field of radar signal processing, and discloses a method for optimizing carrier frequency of a frequency-agile radar. The method comprises the steps of establishing an echo signal model of the frequency-agile radar; converting the echo signal model of the frequency-agile radar to a corresponding compression perception model of the frequency-agile radar, and obtaining the compression perception model of the echo signal of the frequency-agile radar; constructing an objective function according to the compression perception model of the echo signal of the frequency-agile radar, wherein the objective function comprises the carrier frequency sequence of the frequency-agile radar; and solving the objective function by means of a simulated annealing algorithm, and obtaining the carrier frequency sequence of the frequency-agile radar after optimization.

The invention provides an electromagnetic wave protection film capable of being repeatedly pasted and used. In the electromagnetic wave protection film, a surface of a base material is provided with one insulated flexible bonding layer. A surface of the insulated flexible bonding layer is provided with at least one metal layer. A metal layer surface is provided with one pressure-sensitive-type conducting resin layer. A surface of the pressure-sensitive-type conducting resin layer is provided with a protection film. Compared to a tedious heating lamination post curing technology, by using the film of the invention, only a portion which needs the electromagnetic wave protection film is pressed, a processing application technology is simple, and more laminated machines, baking ovens and other equipment are not needed; redundant personnel setting and complicated operation steps are not needed, a tolerable error rate is high, and energy losses and a possibility of generating danger in a subsequent operation can be effectively reduced; and more importantly, after actual positioning and pasting are wrong, repeated positioning usage can be stripped so that a waste edition which is generated because pasting is wrong is not generated. The protection film can be widely applied to portions of a mobile phone, a camera, a medical apparatus, a laptop and the like, such as a FPC soft board, PCB hard board and the like, wherein the portions needs electromagnetic protection.

The invention belongs to the field of double-base MIMO radar clutter rejection technologies, and particularly relates to an airborne double-base MIMO radar clutter rejection method based on sparse recovery. The airborne double-base MIMO radar clutter rejection method based on sparse recovery comprises the following steps that echo data, obtained after filtering, of each distance door are obtained through matched filtering; the amplitude of clutter in each receiving-transmitting-Doppler space is calculated through a sparse recovery method; a covariance matrix of each distance door and corresponding received data, except for transmitted waveforms, of each distance door are obtained; the corresponding received data, except for the transmitted waveforms, of each distance door are registered to obtain compensated data of the corresponding distance door; an optimal weight vector is obtained according to the compensated data of each distance door; weighting summation is carried out on the corresponding received data, except for the transmitted waveforms, of each distance door through the optimal weight vectors to obtain echo data generated after clutter rejection.

The invention relates to a mine communication system, in particular to a mine bi-directional speech direct-sequence spread-spectrum and through-the-earth communication system and method relating to the spread spectrum technique. A terrestrial television transceiver of the mine bi-directional speech direct-sequence spread-spectrum and through-the-earth communication system is communicated with a loop antenna and a handheld terminal, and the handheld terminal is communicated with a positioning device. A mine television transceiver is communicated with a mine loop antenna and a mine handheld terminal. A direct sequence spectrum communication system is arranged between the terrestrial loop antenna and the mine loop antenna. By adopting the proposal, the invention has the advantages of anti-interference, multi-path and low interception rate due to the direct-sequence spread-spectrum digital wireless communication system and can be used for bi-directional speech through earth communications. The mine bi-directional speech direct-sequence spread-spectrum and through-the-earth communication system and method apply to accident warning and rescue in mineral enterprises.

The invention discloses a target detection method based on a two-dimensional reconstruction algorithm, belonging to the technical field of radar signal processing. The target detection method based onthe two-dimensional reconstruction algorithm comprises the following steps of: step 1, establishing a transmitting signal model of a frequency agile radar and an echo signal model of the frequency agile radar; step 2, calculating a two-dimensional joint dictionary matrix corresponding to the echo signal model of the frequency agile radar; and step 3, obtaining a compressed sensing model, and calculating to obtain a distance and a speed of a target according to the two-dimensional joint dictionary matrix corresponding to the echo signal model of the frequency agile radar as target detection results. Through exploring sparse characteristics of a target scene, the speed and distance of the target can be directly reconstructed by means of the two-dimensional reconstruction method.

The invention discloses an on-line diameter measurement device for a large-diameter solid of revolution, and the device comprises a first measurement group and a second measurement group, wherein the first measurement group and the second measurement group are symmetrically arranged on two sides of a measured solid of revolution; the first measurement group and the second measurement group are symmetrical to the axis of the measured solid of revolution; the two measurement groups respectively correspond to two ends of the measured solid of revolution; each measurement group comprises a transmitting end for transmitting measurement lights, a receiving end aligned with the transmitting end and an adapting piece for connecting the transmitting end and the receiving end; the measured solid of revolution is positioned between the transmitting end and the receiving end; the measured lights are formed into blocked lights and residual lights after meeting the measured solid of revolution, wherein the blocked lights are blocked by the measured solid of revolution and can not be transferred to the receiving end, and the residual lights penetrate through the measured solid of revolution to reach the receiving end; the receiving end receives the residual lights and calculates the light band width of the residual lights; the receiving end inputs the light band width into a processor; and the processor calculates to obtain the diameter of the measured solid of revolution. The on-line diameter measurement device has the advantages of high measurement precision and low manufacture cost.

The invention discloses an estimation method of DS (direct sequence) / FH (frequency hopping) spread spectrum signal parameters based on a cyclic spectrum theory and a splicing technology, which is mainly used for solving the problem of poor estimation performance of DS / FH spread spectrum signal parameters in the existing method. The estimation method comprises the following steps: firstly pre-estimating carrier frequency and code rate of DS / FH spread spectrum signals according to the cyclic spectrum theory; dividing and extracting the DS / FH spread spectrum signals based on the pre-estimated carrier frequency and code rate; splicing the divided and extracted signals; and finally estimating the carrier frequency and code rate of the spliced signals according to the cyclic spectrum theory. The estimation method has the advantages of strong anti-jamming capability, high parameter estimation accuracy and capability of effectively reducing estimation errors, thus the method can be used for processing communication signals.

The invention belongs to the technical field of intelligent identification and control, and particularly relates to an intelligent home control system and method based on a millimeter-wave radar. Thesystem comprises a millimeter-wave radar system, a signal processing system, an artificial intelligence classification system, and a central control system, wherein the millimeter-wave radar system emits linear frequency-modulated continuous-wave signals to a radar illumination scene, receives echo signals reflected by the scene, and obtains intermediate-frequency original data through processing;the signal processing system carries out processing on the original data to obtain feature data, and transmits the feature data to the artificial intelligence classification system; the artificial intelligence classification system carries out offline training and online classification on the millimeter-wave radar feature data, and transmits results to the central control system; and the centralcontrol system carries out real-time system control, monitoring and communication. The intelligent home control system and method based on the millimeter-wave radar provided by the invention has the advantages that non-contact remote control in the field of intelligent home is achieved through the millimeter-wave radar, so that daily life is more convenient, comfortable and intelligent; and the system is applicable to places such as ordinary households, offices, conference rooms, etc.

The invention discloses an optical fiber mode separator. An optical fiber is composed of host materials and three fiber cores, wherein center lines of the fiber cores form a straight line, the center distances between the middle fiber core and the side fiber cores are the same, and refractive index distribution and fiber core dimensions of the fiber cores are the same. The optical fiber structure with the three fiber cores is adopted, therefore, coupling length difference among different modes is increased, the modes can be separated effectively, and clutter among different modes can be inhibited effectively. The optical fiber mode separator is used in a serial connection mode, and capable of effectively separating a plurality of different modes. Optical fiber parameters are identical completely, and therefore, difficult manufacturing and effect of parameter errors on coupling performance of optical fibers are avoided when the fiber cores different in dimensions are adopted.

The invention discloses a tunnel surrounding rock deformation distributed optical fiber monitoring method and device based on pipe-shed support. The method comprises the following steps: A, drilling a hole in a guide pipe by using a pipe shed drilling machine and enabling a sleeve to follow up; B, sealing an optical fiber joint by using a plastic film after a pipe-shed steel tube are in place; C, gluing an optical fiber measuring tube single section at a steel tube mouth by using an inner connection pipe; D, splicing optical fiber measuring tube single sections; E, installing a drilling hole sealing device; and F, connecting in series the sensing fibers of the optical fiber measuring tube single sections at different monitoring positions of a tunnel pipe-shed support structure by using an extension adapter. The outer sidewall of the optical fiber measuring tube single section has orthogonally symmetrical grooves. The end of the optical fiber measuring tube single section is provided with an extension adapter for easy splicing. The guide pipe is inserted into a steel arch frame in an inclined manner. The pipe-shed steel tube is located inside the guide pipe. The optical fiber measuring tube single sections are located in the pipe-shed steel tube. The method and device achieve tunnel pipe-shed support surrounding rock distributed monitoring and advanced monitoring, and has economical, convenient, anti-interference and durable performance.

The invention provides a space-frequency-polarization combined cooperation detection method. Considering randomness of a target attitude angle, the method that the largest weighted average detection probability is taken on azimuths is adopted, so that spatial attributes, frequency attributes and polarization attributes of all node radar in a cooperation network are configured, a constructed cooperation detection system can achieve a space-frequency-polarization diversity technology in a combined mode, more and richer target diversified information is obtained in comparison with other radar systems, detection performance is higher, the power range is larger, and furthermore, the mode that a node radar system is combined with a network is adopted, so that the cooperation detection method has the advantages of being resistant to destroying and interfering and achieving self-organization.

The invention discloses a light emitting diode (LED) induction lamp. The LED induction lamp comprises an induction part and a lamp part, wherein the induction part consists of a light induction module, a microwave induction module and a data acquisition and processing unit which are connected with one another; the lamp part consists of an LED light source and a power source which are connected with each other; the light induction module comprises a photosensitive resistor which displays a high-resistance state under the condition of strong light irradiation and displays a low-resistance state under the environment of weak light; a brightness signal and an attendance signal are acquired by using the photosensitive resistor and a microwave sensor; lighting and duration of the lamp are controlled by using a singlechip; when the surrounding environment is brighter, the power supply of the LED lamp is cut off; and when the surrounding environment is darker, whether a person exists around the lamp is judged, and the LED lamp is lighted if the person exists and is turned off if no person exists. The intelligent induction device is suitable for various occasions, and has the characteristics of high flexibility, anti-interference, silence, high response speed, long induction distance and the like.

The invention provides a fiber Bragg grating technology based rainfall monitoring method and device. The gravity of the rain water is converted into the strain of beams through stress of the equal-strength cantilever beams and then converted into the change of Bragg wavelengths of fiber gratings, the change quantity of the wavelengths of the fiber gratings is detected through a demodulation instrument, and accordingly the measurement on the atmospheric rainfall can be achieved. According to the fiber Bragg grating type rainfall monitoring device, a cable (9) is leaded out of an electric overflow valve (5) which is arranged in a fiber Bragg grating rain gauge; an optical cable (10) is leaded out of a fiber Bragg grating strain sensor (8); the cable (9) is connected with a control unit module (11); the optical cable (10) is connected with the fiber Bragg grating demodulation instrument (12); output of the control unit module (11) and the fiber Bragg grating demodulation instrument (12) is connected with input of a lower computer (13); output of the lower computer (13) is connected with a wireless communication module I (14); output of a wireless communication module II (15) is connected with input of an upper computer (16). According to the fiber Bragg grating type rainfall monitoring method and device, the monitoring on the atmospheric rainfall can be high in sensing accuracy, high in measurement accuracy, low in cost and automatic and real-time.

The invention discloses a graphene annular loop fan-shaped loading patch-based implantable circularly polarized antenna. The radiation patch and ground plate of the antenna are both made of multilayergraphene films; since the multilayer graphene films are adopted to process the antenna, the performance of the antenna can be improved, loss is effectively reduced, and transmission efficiency is improved. Four fan-shaped loading patches are additionally arranged on an annular loop, and therefore, the design size of the antenna can be effectively reduced. Rectangular stubs which have the same size and are arranged in a staggered manner are additionally installed between the four fan-shaped loading patches, so that an interdigital capacitor structure is formed, and therefore, the resonance frequency of the implantable antenna is reduced. Conduction bands are slotted, and rectangular open-circuit protrusions are additionally adopted, and therefore, geometric perturbation is generated, and acircular polarization characteristic is generated. The size of the antenna is only 5.5*5.5*0.635mm<3>. The graphene annular loop fan-shaped loading patch-based implantable circularly polarized antenna has the advantages of wide frequency band, circular polarization, miniaturization, good anti-interference performance, good biocompatibility and the like. The antenna is suitable for a WMTS 1.43GHzfrequency band. The working requirements of the antenna implanted into a complex environment can be satisfied.

The invention discloses a measuring method for a non-gate-control liquid turbidity measuring device based on time correlation single photon counting. The non-gate-control liquid turbidity measuring device comprises a light source module, a light path transport module, a photovoltaic conversion and single processing module and a standard turbidity liquid. According to the method, after being subjected to modulation by a high-speed narrow pulse, a light source acts on the standard turbidity liquid, after being received, 90-degree scattered lights of the standard turbidity liquid act on the photovoltaic conversion and single processing module to obtain a statistical histogram of photo count values and light flight time, and characteristic parameters on the statistical histogram are extracted; the measuring device is calibrated according to a characteristic parameter acquiring method to obtain inherent parameters of the device; during practical measurement, a turbidity value of a liquid to be measured can be obtained after corresponding characteristic parameters obtained through statistical measurement as well as the inherent parameters of the device are subjected to inversion, so that the accurate measuring of the liquid turbidity can be realized. According to the method, the structure of the device is simple, the stability is high, the realization is easy, the measurement accuracy is high, the measuring speed is high, the real-time performance is good, and a technical support is provided for on-line water quality monitoring in real time.

The invention discloses an imaging box, an imaging box chip and a short circuit evasion method of the imaging box chip. The imaging box chip comprises a circuit board and a storage element which is arranged on the circuit board. The circuit board is at least provided with two connection terminals which respectively are the first connection terminal and the second connection terminal. The imaging box chip further comprises a first short circuit detection terminal, a power supply unit and a short circuit processing unit, wherein the whole first short circuit detection terminal or a part of the first short circuit detection terminal is arranged between the first connection terminal and the second connection terminal; the power supply unit is connected with the first short circuit detection terminal; the short circuit processing unit is directly or indirectly connected with the power supply unit, and executes short circuit evasion processing when short circuits exist between the first short circuit detection terminal and a specific terminal. By the adoption of the imaging box, the imaging box chip and the short circuit evasion method of the imaging box chip, the short circuit phenomenon can be detected in time, and therefore electronic elements in the chip can be prevented from being damaged.

The invention relates to an LED display and key detection multiplexing circuit. One end of a pull-up resistor is connected with a power source end, the other end of the pull-up resistor is connected with one end of a key and one end of an input resistor, the other end of the key is connected with the reference ground, and the other end of the input resistor is connected with a port of a single chip microcomputer; one end of a current-limiting resistor is connected with the port of the single chip microcomputer, the other end of the current-limiting resistor is connected with a collector of an audion; a base of the audion is connected with a base resistor, the other end of the base resistor is connected with the port of the single chip microcomputer, an emitter of the audion is connected with the positive pole of a display device, and the negative pole of the display device is connected with the reference ground; one end of a pull-down resistor is connected with the base of the audion, and the other end of the pull-down resistor is connected with the reference ground. The port of one single chip microcomputer is used for processing LED display and key detection in a multiplexing mode, LED short-circuit failure or interference with the other multiplexing function after key short-circuit failure can be effectively prevented, and the service life of the product is effectively prolonged.

The invention discloses an underwater gravity gradient target detection method based on a Newton iteration method. The method comprises a step of performing real-time measurement on a sailing area byusing a gravity gradiometer of an underwater vehicle to obtain a measured gravity gradient value, a step of subtracting a normal gravity gradient value from the measured gravity gradient value to obtain a gravity gradient anomaly value, a step of taking the gravity gradient anomaly value as an input of a gravity gradient model nonlinear equation and solving a nonlinear equation group to obtain therelative position of the centroid of a target body relative to a detection point, a step of determining a distance between the centroid of a target body relative and the detection point according tothe relative position of the centroid of the target body relative to the detection point, and a step of substituting the above distance and a universal gravitation constant into a gravity gradient vertical component formula to obtain the mass of the target body. The approximate substance type of a density anomalous body can be calculated according to needs. The method has anti-camouflage and anti-interference characteristics, the detection method is simple and popular and is easy and fast to use, the manual intervention is greatly reduced, and automatic detection is achieved.