289results about How to "Achievement distance" patented technology

The invention provides an indoor range finding and positioning method based on MIMO-OFDM channel state information. A present commercial WiFi network card based on OFDM is fully utilized, channel state information CSI is obtained by a client at a position to be measured, an MIMO system whose receiving/transmitting end includes multiple antennas is combined, a free-space path loss model based on MIMO-OFDM is provided, the line of sight LOS distance between a WiFi access point AP of an indoor anchor point and a user at the position to be measured is calculated, and finally the position of the user is obtained by a classic three-side positioning method. The method is based on the multi-antenna WiFi AP which is used most widely at present and a mainstream wireless network card based on OFDM, and can realize rapid, simple and efficient indoor range finding and positioning.

The present invention relates to a double circular shield construction method passing through building or structure, belonging to the field of building engineering technology. Said construction method includes the following steps: 1, earlier stage preparation for passing through building or structure; 2, adopting protection measure for building or structure; 3, construction monitoring; 4, making double circular shield be passed through building and structure; and 5, adopting secondary grounting measure.

The clutch of magnetohydrodynamics in centrifugal type is composed of input shaft, output shaft, magnetohydrodynamics, electromagnetic coil and clutching body, which consists of dish shell and sliding bock which can slide along radial direction under the action of centrifugal force to create effects of self-pressurizing for making shearing stress of magnetohydrodynamics a quite great increase. It has the characteristics of big driving torque and less power consumption comparing with the existing clutch of magnetohydrodynamics.

The invention relates to a reversing obstacle automatic detection and early warning method based on binocular vision. The method comprises steps that: 1), a binocular camera is calibrated; 2), a pavement area without abundant textures is removed from a binocular video frame image pair; 3), the contour at the right eye image is extracted, and cutting amount of a left eye image is determined; 4), a disparity image based on the left eye image is acquired according to the cut left eye image and the complete right eye image; 5), a splicing position of the right eye image is determined according to the disparity image of the left eye image, and the left and right eye images are spliced; 6), a suspected barrier contour and an external rectangle are extracted from the spliced image of the left and right eye images; and 7), pixel height of the suspected obstacle is calculated, the obstacle is screened, a distance to the obstacle is calculated, obstacle and distance marks are made on the spliced image, and grading early warning is realized. The reversing obstacle automatic detection and early warning method has advantages of simple and practical performance and high accuracy.

The invention provides a wideband digital frequency selecting pulling system, wherein a DAU diplexer in DAU, a DAU wideband digital downlink, a DAU photoelectric conversion subsystem, a DAU wideband digital uplink, and a DAU diplexer are connected in sequence; a DAU power subsystem and a DAU monitoring subsystem are respectively connected with the DAU wideband digital downlink and the DAU wideband digital uplink; the DRU photoelectric conversion subsystem in DRU, a DRU wideband digital uplink, a DRU diplexer, a DRU wideband digital downlink, and a DRU photoelectric conversion subsystem are connected in sequence; and a DRU monitoring subsystem and a DRU power subsystem are respectively connected with the DRU wideband digital uplink and the DRU wideband digital downlink. The invention also provides a signal processing method which is achieved by adopting the system. The invention can reduce the use of analog devices and realize the bandwidth digital frequency radiating pulling system with different bandwidth.

The invention relates an LED (Light Emitting Diode) indoor lighting dimming control system based on a mobile phone, which comprises a microcontroller, a memory, an Ethernet module, a Bluetooth module, an LED driver and a power source part. The microcontroller takes charge of controlling and coordinating the work of the all modules; the memory is used for memorizing network data and user configuration information; the Ethernet module is connected with an internet and used for receiving transmitted signals; the Bluetooth module is used for receiving the control information transmitted by the Bluetooth of the mobile phone and is in communication with the microcontroller by a serial interface; and the three-path LED driver is used for receiving PWM (Pulse-Width Modulation) dimming signals so as to regulate the brightness of a three-color LED. According to the LED indoor lighting dimming control system, the mobile phone is taken as a terminal and can control an indoor LED lamp. When a user is in a room, the mobile phone is in communication with the system through the Bluetooth function so as to regulate the brightness of various paths of indoor LED lamps and further achieve the purpose of making the eyes of people comfortable. When a user is far away from the system, the user can login the WEB of the system to configure the system through the GPRS function of the mobile phone, so that the same effect can be achieved.

The invention relates to a laser-induced breakdown spectroscopy based explosive real-time remote detection method, belonging to the field of the spectrum detection technology. The method comprises the steps of: measuring different regions of a sample to be detected by a laser-induced breakdown spectroscopy based measurement system to obtain a spectrum; performing normalization processing to the spectral line intensity and the intensity ratio; taking the preprocessed characteristic spectral line intensity and ratio thereof as input variables, judging by a supervised learning method or a non-supervised learning method and determining whether the sample to be detected contains an explosive. According to the method, the detection efficiency is improved, the detection process is simplified, close and remote real-time detection can be realized simultaneously, a PLS-DA (partial least squares discriminant analysis) or K mean value sorting method is used to correctly judge the explosive when the processing elements constitute a substance similar to the explosive, the detection accuracy is effectively improved, and the method can be applied to airports, railway security checking and anti-terrorist and actual battlefields.

The invention relates to a system and a method for fast accessing high-efficiency near field communication with a controllable communication range. The system comprises at least one master module and at least one slave module, wherein the master module is used for sending a distance reference signal which includes master module information and communication distance information; the slave module is used for judging whether the distance between the master module and the slave module is in accordance with a preset range according to the received distance reference signal; and if the distance between the master module and the slave module is in accordance with the preset range, wireless communication connection between the master module and the slave module is established according to a preset protocol, and data exchange between the master module and the slave module is realized. A reference unit and a measuring unit communicate with each other by adopting a low-frequency magnetic signal or an ultrasonic wave signal, so a requirement for near access can be met. By the system and the method, instant, fast and high-efficiency wireless data exchange within a specific distance range is realized.

The invention relates to a device and method to measure precipitation runoff in farm field water conservancy. The runoff well and seepage well are connected by runoff-seepage communicating pipe. A water counter is set on water-yielding port of communicating pipe. Runoff bucket is at the bottom of well. There is a micro-water pump in well. Water counter connects radio-transmitting set. The method is suitable for measurement of seepage discharge, crop requirement and water quality. Surface runoff observation is divided to runoff Q track, moisture-holding Q soil and seepage water Q seepage, that is: Q fall=Q track + Q soil + Q seepage. The formula of water capacity is: Q soil=Q fall - Q track - Q seepage. According to duty Q fill and moisture variety DeltaQ soil, crop water requirement (water consumption Q crop in a period) is achieved: Q crop= Q fall+ Q fill- Q track- Q seepage+ DeltaQ soil. The invention resolves the problem of large error and high cost by using runoff field to measure.

The invention relates to an automatic cleaning system for a solar cell panel. The automatic cleaning system comprises the solar cell panel, wherein a cleaning car is arranged on the solar cell panel, and is provided with a cleaning hairbrush; the cleaning hairbrush is integrally manufactured; road wheel groups are arranged at the bottom part of the cleaning car; a power transmission case is arranged at the upper part of the bottom part of the cleaning car; driving wheel groups are arranged at the bottom part of the power transmission case; driven wheel groups are arranged at the lower part of the bottom part of the cleaning car; and caterpillar tracks are arranged outside the driving wheel groups, the driven wheel groups and the load wheel groups respectively. The automatic cleaning system for the solar cell panel has the beneficial effects that the integral hairbrush is relatively clean to clean, and can also effectively clean when a relatively large gap or height difference is formed between the solar cell panels or the relatively large gap and height difference are formed between the solar cell panels; background display and central control room control can also be achieved; and the functions of position display fault alarm, remote startup, remote parking, alarm and the like of the cleaning car of the solar cell panel are achieved.

The invention provides a high-capacity organic garbage lifting and oriented discharging system, relates to a device for oriented transport and storage of organic garbage and capable of realizing vertical lifting and short-distance horizontal conveying of the organic garbage to overcome the vertical elevation difference in processing. The high-capacity organic garbage lifting and oriented discharging system comprises a feed bin assembly, a lifter assembly, a main frame, a vertical hoisting mechanism and an automatic control system. The feed bin assembly is mounted in the lifter assembly which is capable of moving vertically upwards under traction of the vertical hoisting mechanism, so that a feed bin moves vertically along with the lifter assembly. A horizontal expansion mechanism is mounted on the feed bin assembly to drive the feed bin assembly to move along the horizontal direction of the lifter assembly, and accordingly operations of vertical lifting, horizontal moving and oriented discharging of garbage are realized and can be performed cyclically during feeding and discharging of garbage.

The invention provides a method for visually analyzing crack propagation under hydraulic fracturing effect, comprising the steps of S1, providing a run-through crack of preset diameter along the center of a cylindrical coal sample; S2, providing a first seal mechanism and a second seal mechanism at the inner walls of the run-through crack, and constructing a space suitable for hydraulic fracturing effect; S3, placing the cylindrical coal sample with the first and second seal mechanisms as a coal sample or rock sample test piece to be tested, into an apparatus visually analyzing crack propagation under hydraulic fracturing effect, connecting a connector of a data cable for collecting parameters, and sealing and fixing; S4, setting corresponding analytic parameters in the apparatus; S5, injecting water from an inlet of a water injection pipe of the apparatus, opening a one-way valve to allow the water in a water delivery pipe to enter the space for hydraulic fracturing effect, subjecting the test piece to hydraulic fracturing effect, and processing recorded data and images after set hydraulic fracturing results are reached. Inner crack distribution characteristics and propagation images of a test piece under hydraulic fracturing effect can be acquired by using the method.

The invention discloses a long-term monitoring apparatus for a soil pressure outside a duct piece of a shield tunnel. The long-term monitoring apparatus is composed of a fiber grating strain brick, a fiber grating temperature compensation block, a cable box, and an armored cable. The fiber grating strain brick consists of a measuring stone and a mortar layer coating the outside of the measuring stone; and four fiber gratings are arranged at each of three surfaces, being perpendicular to each other, of the measuring stone. The fiber grating temperature compensation block includes a hollow metallic cylinder and a temperature compensation stone arranged inside the metallic cylinder; the space between the temperature compensation stone and the metallic cylinder is filled with EVA foam; and four fiber gratings are arranged at each of three surfaces, being perpendicular to each other, of the temperature compensation stone. In addition, the invention also discloses a long-term monitoring method for a soil pressure outside a duct piece of a shield tunnel. Using the apparatus and method disclosed by the invention, the soil pressure monitoring error can be reduced; and the installation survival rate can be improved. Moreover, the apparatus and method have characteristics of good anti-electromagnetic-interference and corrosion-resistant performances and low signal attenuation; and the soil pressure outside a duct piece of a shield tunnel can be monitored accurately for long time.

The invention discloses a high-precision servo press fitting method based on a computer, and relates to the field of automation control. The collecting pressure is dynamically compensated according to collected pressure values and a pressure change trend, adaptive control is performed on an elastic workpiece by combining with a displacement sensor and a pressure sensor, therefore, the pressing accuracy and pressure control stability for the elastic workpiece are improved, the phenomenon that elastic workpiece pressing is unqualified due to the fact that in a traditional technology, the pressure is too large or the actual pressing pressure is slightly smaller cannot occur, and the workpiece quality is guaranteed; meanwhile, due to the fact that the influence of interfering data is greatly eliminated, the adaptability of the pressure control method in different processing environments can be guaranteed.

The invention discloses a fog-penetrating and night-vision system based on a refrigeration type CCD element. The fog-penetrating and night-vision system is a device detecting the emitted or reflected light of objects in different wave bands (visible light and near-infrared band) and realizing imaging; the functions of fog-penetrating and night-vision of the device are greatly enhanced; the refrigeration type CCD element is used to increase the resolution ratio and sensibility of the imaging system; high-performance real-time image fusion and enhancing treatment algorithm is adopted, and all-weather remote target detection and imaging can be realized with low cost.

The invention discloses a communication apparatus of a modularization self-configuration robot and a communication method thereof, the communication apparatus comprises several functional modules, a side wireless transceiver is arranged at each side of each functional module, and the signals between side wireless transceivers at the side of the functional module are not mutually covered; a control terminal wireless transceiver and a microcontroller are arranged on the functional module; and the side edge wireless transceiver and the control terminal wireless transceiver employ different work frequency. The function modules are connected through side, the side wireless transceiver signal scopes are mutually covered; and one and only one of the control terminal wireless transceivers of several functional modules is in a working state, wireless and long distance communication of the modularization self-configuration robot can be realized, conjuncted configuration identification of the modularization self-configuration robot can be also realized; and the control communication of the whole modularization self-configuration robot and the control communication of each function module are not mutually interfered.

The invention provides a macadam slope vegetation recovery structure and a construction method, and relates to the technical field of slope restoration. According to the macadam slope vegetation recovery structure, by means of matched arrangement of a covering soil layer, a first protection layer, a base layer, a planting layer and other specific structures, the slope stability can be effectivelyenhanced, ecological restoration on a macadam slope is achieved, the needed covering soil is greatly reduced, and the technical problem that the covering soil layer is large in thickness, the soil volume is large, and a soil source cannot be guaranteed due to the fact that direct soil covering is adopted for plant cultivation in the prior art is relieved. In addition, the macadam slope vegetationrecovery structure can control the macadam slope locally, macadam clearing and carrying expenses are saved, the cost is greatly reduced, and the technical problem that due to the fact that in the prior art, a machine is adopted for clearing and carrying the macadam slope in the prior art, the stacking place is limited, the transportation distance is long, and the clearing and carrying cost is highis relieved. The construction method of the macadam slope vegetation recovery structure is further provided.

The invention provides an improved double-base synthetic aperture radar NLCS (Nonlinear Chirp Scaling) imaging algorithm. The improved double-base synthetic aperture radar NLCS imaging algorithm comprises the following specific steps: firstly, calculating a cubic phase phi 3 of range direction of a target echo, selecting a reference point, acquiring a cubic phase phi'3 at the reference point according to the phi 3 and then multiplying the target echo by the conjugation of phi'3 at the reference point in a two-dimensional frequency domain to obtain a signal for eliminating the influence of high-order phase; secondly, multiplying the processed signal in the first step by a disturbing function phi in a range Doppler domain and multiplying the multiplied result by a matched filter phi R in the two-dimensional frequency domain; thirdly, converting the processed signal in the second step to a two-dimensional time domain to be multiplied by a direction distribution function phi 4, then multiplying the multiplied result and a matched filter phi 5 in the range Doppler domain and finally multiplying the multiplied result and phi 6 in the two-dimensional time domain to obtain an SAR (Synthetic Aperture Radar) slope-distance image; and fourthly, carrying out geometric rectification on the SAR slope-distance image acquired in the third step to obtain an SAR ground range image. According to the improved double-base synthetic aperture radar NLCS imaging algorithm, the influence generated by the two-dimensional spatial variability of the range tuning frequency and high-order phase when a sender is seen obliquely is improved.

The invention discloses a reservoir area high slope unmanned aerial vehicle automatic monitoring system and method. The system comprises monitoring systems, a solar current collection apparatus, an unmanned aerial vehicle, an unmanned aerial vehicle mobile station, an inspection vehicle and a monitoring analysis center, the monitoring systems are arranged on high slopes and acquire monitoring data of the high slopes, the monitoring systems perform data transmission with the monitoring analysis center through a mobile network in high slope regions covered by the mobile network and perform short-distance data transmission through bluetooth and the unmanned aerial vehicle in high slope regions which are not covered by the mobile network, the unmanned aerial vehicle is connected with the monitoring analysis center through the mobile network to realize data transmission when flying into a mobile network covering region, the unmanned aerial vehicle mobile station is arranged on the inspection vehicle, provided with a fuel generator, and used for maintenance and charging of the unmanned aerial vehicle, and the monitoring systems can obtain electric energy through the solar current collection apparatus or the unmanned aerial vehicle. According to the system and method, rapid and automatic monitoring of a lot of high slopes of a reservoir area can be realized, assistance is provided for the security of the high slopes of the reservoir area, and the security of a reservoir dam and the high slopes of the reservoir area can be guaranteed.

The invention discloses a water pump system and a control method for the water pump system. The water pump system comprises a water pump execution module and a control module. The water pump execution module is connected with the control module in a wireless communication manner. According to the water pump system, by arranging the control module, the water pump execution module is connected with the control module in the wireless communication manner, a keeper can detect the working parameters, such as the water pump power, the water pump rotating speed, the water pump flow and the water pump temperature or other performance indexes, of a water pump remotely, and the working parameters of the submerged pump are adjusted or the submerged pump is started or stopped according to the requirements, or the automatic starting/stopping time of the submerged pump is set according to the requirements, so that the effect that the submerged pump is monitored and operated remotely is achieved.