448results about How to "Improve detection distance" patented technology

A sensor apparatus includes a sensor unit, a calculation unit, a switch circuit unit, and a control unit. The sensor unit has a plurality of detection electrodes each having a capacitance changed by proximity of a detection target object. The calculation unit calculates a first distance, which is a distance between the detection target object and the sensor unit. The switch circuit unit is capable of switching the detection electrodes between a first state in which a signal voltage for detecting the capacitance is supplied and a second state which is an electrically floating state, and selects at least two detection electrodes one by one switched from the second state to the first state. The control unit controls the switch circuit unit to cause a second distance, which is a distance between the detection electrodes switched from the second state to the first state, to correspond to the first distance.

The invention discloses a vehicular visible light wireless digital voice communication system. The vehicular visible light wireless digital voice communication system comprises a sending module and a receiving module. The sending module comprises a digital audio acquisition unit, an RS coding unit, a PWM (pulse width modulation) unit, an LED (light emitting diode) drive unit and an LED transmitting unit, which are connected successively in circuit; the receiving module comprises a PIN photoelectric detection unit, a signal extraction unit, a PWM modulation unit, an RS decoding unit and a digital audio output unit, which are connected successively in circuit. The wireless digital voice communication system realizes instant voice communication between strange vehicles; an LED-based lamp is integrated with automobile lighting and communication without the need of an additional signal emission source installation space and occupation of scarce frequency spectrum resource. The voice signal transmission is high-speed and reliable, high in integration level, strong in anti-interference ability and low in cost, and bigger communication distance and more reliable communication are realized; moreover, a detector has high accuracy, high responsivity, low dark current, higher communication rate, stronger anti-interference ability and high reliability of a transmission channel.

The invention provides a fire detection system and a method thereof. The system comprises a monitoring module which is used for obtaining fire monitoring information of a preset protection area and also comprises a variable-viewing field vidicon, a pretreating module which is connected with the monitoring module and is used for analyzing and processing the fire monitoring information and obtaining a suspected fire occurring area of the preset protection area, a control module which is connected with the pretreating module and the variable-viewing field vidicon and is used for controlling a close-shot image of the suspected fire occurring area obtained by the variable-viewing field vidicon, a fire judgement module which is connected with the variable-viewing field vidicon and is used for judging whether fire occurs in the preset protection area according to the close-shot image of the suspected fire occurring area and obtaining a judgement result and a first warning module which is connected with the fire judgement module and is used for outputting warning information when the judgement result shows that fire occurs in the preset protection area. The fire detection system can obtain the close-shot image of the fire occurring area automatically.

The invention relates to the technical field of artificial intelligence, and in particular relates to a laser radar coaxial optical system. The laser radar optical system comprises a transmitting optical unit and a receiving optical unit; the transmitting optical unit comprises a laser, a collimating lens and an MEMS galvanometer; the receiving optical unit comprises a receiving lens and an aperture reflector, wherein the collimating lens, the aperture reflector and the MEMS galvanometer are sequentially arranged on the subsequent optical path of the light beam transmitted by the laser; afterbeing collimated through the collimating lens, the light beam transmitted by the laser passes through the small hole of the aperture reflector, and enters the MEMS galvanometer; the MEMS galvanometerdeflects and reflects incidence laser onto a target object; and reflected light of the target object is reflected through the MEMS galvanometer, and enters the receiving optical unit. According to thelaser radar coaxial optical system and the laser radar in the invention, coaxial optical path design is adopted; transmitting and receiving optical paths are combined through the aperture reflector;exit laser is scanned from the combined laser through the MEMS galvanometer; the laser radar optical system is convenient to debug; furthermore, due to beam combination, optical signal loss is low; and the detection distance is greatly increased.

The invention belongs to the technical field of antenna engineering, and discloses a strong mutual-coupling ultra-wideband wide-angle scanning dual-polarized conformal phased-array antenna. The strong mutual-coupling ultra-wideband wide-angle scanning dual-polarized conformal phased-array antenna comprises a conformal dielectric substrate, conformal dipole units, a circular metal patch, a conformal dielectric layer, a conformal dielectric impedance matching layer, a metal ground matching layer, an unbalance feeding structure, five grounding metallized through holes, a microwave coaxial cable and a metallized frustum-shaped carrier, wherein the conformal dipole units are printed on an upper layer of the conformal dielectric substrate, and placed in a vertical intersection way; the circular metal patch is printed on a lower layer of the conformal dielectric substrate; the conformal dielectric layer is positioned below the conformal dielectric substrate, and subjected to hole digging treatment; the conformal dielectric impedance matching layer is positioned above the conformal dielectric substrate; and the microwave coaxial cable is used for feeding the unbalance feeding structure. The weight of the novel antenna is only 70 percent that of a conventional phased array, so that the requirement on the load carrying of a carrier is lowered greatly. The metal ground matching layer is used, so that an original complex matching circuit is omitted; the machining difficulty is lowered greatly; and the machining cost of the antenna on engineering applications is lowered.

The invention discloses a substation patrol robot obstacle avoidance method based on laser radar. A robot scans the surrounding environment through laser radar; an adopted environmental map is a two-dimensional matrix, which is a Boolean matrix of an actual substation, and the position in the substation having a device is defined as Boolean true; the current position coordinate of the robot and heading angle thereof as well as laser radar data obtained after mapping are fused; at the moment, whether the two-dimensional matrix is true or not is judged, if the two-dimensional matrix is true, it is indicated that the corresponding position of the substation has the substation device, and if the two-dimensional matrix is not true, it is indicated that the corresponding position of the substation has an obstacle, and with the coordinate of the robot as an index, corresponding elements are set as true in a new two-dimensional matrix; and a current surrounding navigation data layer of the robot serves as auxiliary information for obstacle avoidance, if a robot planned travel route passes through a corresponding matrix, where the navigation data layer is true, the robot replans a path and utilizes a shortest path algorithm to avoid the obstacle, thereby reducing possibility of the substation patrol robot in colliding with the obstacles.

The invention relates to the field of radar signal processing, in particular to a radio-frequency interference suppression method of a high-frequency ground wave radar. According to the method, on the basis of original high-frequency ground wave radar signal processing, an empirical mode decomposition method is used for decomposing received signals to obtain a plurality of intrinsic mode functions, radio-frequency interference positions are detected through standard deviation and sliding window processing, power spectrum judgment and instantaneous frequency judgment are conducted on sampling points of the radio-frequency interference positions of the intrinsic mode functions, and the amplitude of the sampling points meeting requirements is set to be zero. According to the radio-frequency interference suppression method of the high-frequency ground wave radar, in actual data processing, the application effect is good, signals are not damaged while noise is reduced, the suppression effect is obvious, the radar detection range is expanded, and the radar detection accuracy is increased.

The invention discloses a coherent laser radar based on pulse coding technology. The invention aims at low signal-to-noise ratio (SNR) of echo signals of coherent laser radars, and proposes a method for improving the signal-to-noise ratio of the system and increasing the dynamic range of the system by using the pulse coding technology. The invention outputs the pulse coding sequence codes by an electro-optic modulator, reduces the time-domain cross-correlation between the respective transmit waveforms, reduces auto-correlated side lobes by using the complementary properties of the Golay complementary sequence, and reduces side lobes after the waveform pulse compression. In addition, the present invention performs decoding according to the decoding rule, solves the problem that the pulse peak power of the fiber laser is limited, significantly improves the signal-to-noise ratio of the coherent laser radar, effectively improves the detection range, and does not require pulse accumulationtime, without sacrificing detection time and distance resolution.

The invention, which belongs to the field of laser radar detection, proposes a two-dimensional MEMS scanning galvanometer laser radar system, thereby extending a receiving field of view and increasinga signal-to-noise ratio. A two-dimensional MEMS scanning galvanometer is a scanning mechanism. A control system controls the laser to emit high-frequency pulsed laser; the returned laser signal lightpasses through a filter and a large relative aperture optical lens successively and then is imaged on the incident end face of an image transmission fiber light cone; the image transmission fiber light cone transmits to the surface of an APD array detector. The image transmission fiber light cone is formed by arranging a cone-shaped optical fiber bundle. The APD array detector selects a corresponding APD detector unit to collect signals according to scanning angle of the two-dimensional MEMS scanning galvanometer and the position of a light spot outputted by corresponding echo light at the image transmission fiber light cone. Therefore, , when the caliber, focal length, and detector area of the receiving optical system are certain, the field of view of the MEMS laser radar can be extended, the interference of the ambient background light on the system can be reduced, and the signal-to-noise ratio of the signal receiving can be improved.

The invention discloses laser radar. The laser radar adopts a multi-channel laser transmitter and a multi-channel photoelectric detector, the positions of the multi-channel laser transmitter and the multi-channel photoelectric detector are fixed, a laser pulse and a laser pulse echo signal are horizontally scanned at the same time by means of rotating a scanning module, an instantaneous view fieldfor receiving the laser pulse echo signal can be very small, the background light noise is relatively low, the relatively large detection range is achieved, no slip ring is needed, no functional modules with functions like wireless power supply and wireless communication are needed, the laser transmitter and the photoelectric detector do not need to be adjusted repeatedly, and the laser radar hasthe advantages of being low in cost, convenient to adjust and install, compact in structure, easy to realize volume production, etc.

The invention relates to a whole day photon counting laser radar device and a method, which comprises an emission system consisting of a laser, an expander and a reflector, a receiving system consisting of a telescope, an optics filter and a photoelectric detector, and a central control device connected with the photoelectric detector with a software. The invention is characterized in that the wavelength of the laser and the optics filter are chosen to match with the fraunhofer absorption line wavelength of the solar spectrum; the intense absorption is adopted to reduce the intensity of a solar back light by 80 to 90 percent and to lead the laser radar to have good photon counting ability under the back light condition in days. The invention is characterized in that the day detection signal-noise ratio and the detection distance are greatly improved, which effectively improves the whole day high-performance working ability. Besides, the invention is widely suitable for the laser radarof detecting weak signal such as Mie dispersion, Rayleigh dispersion, Raman dispersion and atom resonance fluorescence, etc.

In a vehicle radar device, a predetermined number of received light signals output based on a predetermined number of laser beams radiated from a radar sensor are integrated by an integrator to produce an integrated signal. Integration of the predetermined number of received light signals helps amplify the received light signal components corresponding to the waves reflected by reflecting objects, making it possible to improve the sensitivity for detecting the waves reflected by the reflecting object. There are set a plurality of ranges of the received light signals to be integrated, each being shifted by one received light signal. This minimizes a drop in the angular resolution based on the integrated signals.

The invention discloses an all-weather active type panoramic sensing device which comprises a mobile object laser light source, a multi-element output all-around visual sensor and a micro processor, wherein a mirror surface with double curved surfaces and two camera units are arranged in the multi-element output all-around visual sensor; a polarization splitting prism is arranged on a refraction and reflection light path of the mirror surface with double curved surfaces is used for splitting the refraction and reflection light of the mirror surface with double curved surfaces into light containing a certain polarized component and light not containing a certain polarized component; the two camera units are respectively positioned on reflection and refraction light paths of the polarization splitting prism, and are used for respectively acquiring a first panoramic video image containing polarized light information and a second panoramic video image containing light intensity information; the micro processor is used for fusing point cloud geometrical information in the first panoramic video image with the color information in the second panoramic video image, and constructing a panoramic 3D model. The invention further discloses a 3D panoramic modeling approach adopting the all-weather active type panoramic sensing device.

The invention provides a collision distance calculation method and system based on fusion of an ultrasound wave and a camera. On the basis of obstacle detection based on ultrasound and camera fusion,different types of obstacles such as vehicles and pedestrians, pure ultrasound waves are obtained; collision distances are calculated respectively according to vehicle parameters, turning radiuses, vehicle speeds, and different types of obstacle information; areas of interest are selected in different driving directions and turning directions; and distance of all obstacles in the areas of interest are minimized to obtain the fused collision distances. According to the invention, with the existing ultrasonic sensor, all-around CMOS camera, integrated parking controller and all-around controller in a current vehicle, the relative position accuracy of detection is improved and the obstacle detection reliability and detection distances are enhanced. The collision distance calculation methodand system have advantages of reliable detection, high accuracy, high scene adaptability, and moderate cost; and the adaptability of the low-speed auxiliary system is improved effectively.

The invention relates to an unmanned aerial vehicle monitoring system and a monitoring method thereof. The unmanned aerial vehicle monitoring method comprises the following steps: step 1, acquiring animage in a scanning area; step 2, forming a three-dimensional vision to determine whether a suspicious object exists in the image or not through a first camera and a second camera; step 3, if yes, calculating the standard position of the suspicious target, and tracking and shooting the suspicious target. A plurality of servo holders are arranged in the area to be detected, the first camera and the second camera are arranged on the two side end faces of each servo holder, after the unmanned aerial vehicle is found, the unmanned aerial vehicle is tracked and monitored through binocular vision according to the position information, the finding, identifying and disposing of the low-altitude low-speed small targets can be realized, the unmanned aerial vehicle is detected through the two cameras, the concept that the unmanned aerial vehicle is detected by radar is changed, and the detection cost of the unmanned aerial vehicle is reduced.

The invention provides a method for carrying out transient electromagnetic forecasting on a long-distance water-containing target body in front of a tunnel face. The method provided by the invention comprises the following steps: carrying out detection on the long-distance water-containing target body in front of the tunnel face by using a medium-power transient electromagnetic instrument, thereby obtaining observation data of the long-distance water-containing target body in front of the tunnel face; by using a damped least-square algorithm, completing an inversion process of apparent resistivity data, thereby obtaining an apparent resistivity parameter of the long-distance water-containing target body in front of the tunnel face; by using a genetic algorithm, obtaining an electric conductivity parameter of the long-distance water-containing target body in front of the tunnel face; according to the apparent resistivity parameter and the electric conductivity parameter, carrying out explanation on the observation data so as to obtain information of the long-distance water-containing target body in front of the tunnel face. By using the method disclosed by the invention, the information of the long-distance water-containing target body in front of the tunnel face can be obtained, thereby implementing a process of carrying out forecasting on the long-distance water-containing target body in front of the tunnel face by using a transient electromagnetic method.

The invention relates to a long-wave infrared two-speed viewing field tracking measurement lens comprising a main lens cone. The long-wave infrared two-speed viewing field tracking and measuring lens is characterized in that the main lens cone is internally provided with a just crescent fixed lens A, a switching lens group B and a just crescent focusing lens C along an incident direction of infrared light from left to right, wherein the just crescent focusing lens C is driven by a focusing mechanism arranged in the main lens cone; the switching lens group B is divided into a long-focus lens group B (long) used during a long lens focus and a short-focus lens group B (short) used during a short lens focus, and the long-focus lens group B (long) or the short-focus lens group B (short) is driven by a switching rotation mechanism arranged in the main lens cone to be on a same light path with the just crescent fixed lens A and the just crescent focusing lens C. The invention has long designed focus of the lens, can conveniently switch the two-speed viewing field lens and enable a thermal imaging system to carry out tracking measurement on a long-distance target, can not only carry out large-area low-magnification approximate observation on the long-distance target, but also carry out small-area high-magnification detailed observation on the long-distance target.

The invention discloses an infrared medium-long wave double wave band imaging optical system which is mainly used for an infrared focal plane imaging system. The invention puts forward a tetra-sheet optical system. A light beam coming from an infinite distance object space in order passes through a first lens, a second lens, a third lens, a fourth lens, a Dewar window and a aperture diaphragm to form an imagining on an image plane. The aperture diaphragm of the system superposes the Dewar cold diaphragm of a refrigeration photoconductor. According to the system, medium-long wave infrared (MWIR, 3 to 5 [mu] m) and long wave infrared (LWIR, 8 to 12 [mu] m) wave bands form imaginings on a same focal plane. In the system, the relative aperture is 1 to 3, the focal length is 300 millimeters and the field of view is 8 degree. The structure of the invention is mainly characterized by double wave band work, common infrared materials used in the system, 100 percent diaphragm efficiency, simple structure and easy assembling.