22results about How to "Long detection distance" patented technology

The invention discloses a multi-source fusion detection and formation recognition system for an unmanned aerial vehicle cluster. The multi-source fusion detection and formation recognition system comprises a radar detection system, a photoelectric detection system and an information processing module. The invention further discloses a multi-source fusion detection and formation recognition method for the unmanned aerial vehicle cluster. The method comprises the steps that the radar detection system obtains the initial azimuth information of the unmanned aerial vehicle; the information processing module generates guidance information according to the initial azimuth information; the photoelectric detection system tracks the unmanned aerial vehicle according to the guidance information to obtain an image of the unmanned aerial vehicle; and the information processing module obtains the three-dimensional position information of the unmanned aerial vehicle according to the initial azimuth information and the unmanned aerial vehicle image, carries out the recognition of the unmanned aerial vehicle cluster formation pattern, and obtains a formation pattern structure. According to the method, accurate identification and three-dimensional coordinate acquisition of individual targets in a long-distance high-resolution unmanned aerial vehicle cluster and feature identification of the formation of the unmanned aerial vehicle can be realized, and high-reliability information support is provided for command, control and strike decisions.

The invention provides an optical system of a laser radar transmitting lens. The optical system comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, an optical filter, protective glass and an image surface which are arranged in a direction from an object side to an image side. According to the invention, by reasonably using the lenses with specific shapes and structures and limiting the focal power of each lens, the field angle of the optical system is increased to 150 degrees and the relative illumination is greater than 90%, the radar detection field of view is wider and clearer, the F-theta distortion is less than 1%, the CRA is less than 1 degree, the detection distance and precision are improved, and the detection cost is reduced. According to the utility model, more accurate distance measurement data and farther detection distance can be provided, TTL is 29 mm, the size is small, miniaturization can be realized, the camera can be arranged in a vehicle, the matching of 2G3P glass and plastic enables the whole optical system to optimize high and low temperature excursion compensation, it is ensured that the lens does not have virtual focus at high and low temperatures, the cost is more advantageous, and the cost performance is higher.

The utility model provides an ultrasonic sensor structure of promoting detection distance, including shell, the utility model discloses the cooperation structure of coating piece and mounting bracket effectively guaranteed the free vibration state of piezoelectric ceramic piece in foamed colloid filling environment, mounting bracket and piezoelectric ceramic piece do not contact each other, and the piezoelectric ceramic piece of mounting rack top hollow portion inserts the coating piece and ceramic piece top and sticks together but does not produce rigid restraint, make the radial vibration of ceramic piece not be restrained by any solid structure's clamping or bonding, and coating piece will foamed colloid and ceramic piece completely isolate, avoid the damping effect that foamed colloid solidification and ceramic piece surface bonding produce, make ceramic piece can vibrate freely with maximum amplitude, and the electric energy is converted into sound energy and radiates outward with maximum limit, and coating piece as sound matching layer can also reduce the sound wave reflection loss caused by sound impedance difference, further promote sound energy transmission efficiency.

A broadband athermal optical system based on a global surface lens is characterized by the following components arranged sequentially from the outside to the inside along the light propagation direction: a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane). The protective window, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible light reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface for photoelectric conversion. It exhibits high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. This invention belongs to the field of optical imaging technology. The optical system exhibits excellent imaging quality, strong light-gathering ability, and good environmental adaptability within a wide spectral and temperature range of 0.4μm to 2.3μm and -50℃ to +70℃. It features simple structure, easy assembly and adjustment, high reliability, low cost, good manufacturability, and high yield. It can be widely used in aerospace optical remote sensing, ground-based target tracking and detection, optical imaging guidance, astronomical observation, industrial multispectral imaging analysis and non-destructive testing, and civil security surveillance, with broad application prospects and significant economic benefits.

The invention relates to the technical field of optical sensors, in particular to an expandable cascade diffuse reflection laser sensor, which comprises a master device and at least one slave device, the master device and the slave device are communicated through a synchronizing signal and a voltage division sampling signal, and the synchronizing signal and a voltage value are used for controlling the working states of a transmitting end and a receiving end in a time-sharing manner. Compared with the prior art, mutual interference when a plurality of sensors are close to each other is effectively avoided, in addition, synchronous signals of the master device and the slave device are PWM signals, the maximum frequency is 40 KHz, the timer interruption time is 2 microseconds, and the accuracy and effectiveness of receiving ADC sampling are ensured (when an on-chip ADC is used for sampling receiving, the PWM frequency needs to be reduced, and the timer interruption time needs to be increased). The number of the slave devices can be flexibly increased according to actual requirements, and the expansibility and flexibility of the system are improved.

This disclosure presents an integrated navigation system combining a BeiDou front-end and a radar front-end, comprising a backplane mechanism; a radar antenna structure mounted in the middle of the backplane mechanism; and a BeiDou antenna structure mounted on the top of the backplane mechanism. Using an exemplary embodiment of this disclosure, supporting foam is added above the BeiDou antenna and the radar antenna to support the metamaterial above the antenna. Because the dielectric constant of the foam is close to that of air, it allows for good matching between the antenna and the metamaterial, enabling the metamaterial to enhance antenna gain and thus improve the overall system's signal reception capability. Alternatively, the antenna itself and the metamaterial can form an integral structure. The exemplary embodiment of this disclosure enables the integration of the BeiDou satellite navigation system and the radar obstacle avoidance system without altering the original navigation radar mechanism, and enhances radar power, giving it a longer detection range.

The application discloses a low-cost mid-wave refrigeration athermalization optical system based on a silicon germanium material, which sequentially comprises a fairing, a first lens, a second lens, a third lens, a detector protection glass, a cold light diaphragm and an image plane from outside to inside in the propagation direction of light. The first lens, the second lens, the third lens, the detector protection glass, the cold light diaphragm, the image plane and the fairing are coaxially arranged. The optical system is used for receiving infrared radiation inherent to a target and a background, and converging the infrared radiation onto a photosensitive surface of a refrigeration detector to realize photoelectric conversion, so that the target can be detected, identified and accurately positioned at night or under complex weather conditions. The application belongs to the technical field of optical imaging, can adapt to a harsh missile-borne working environment with a wide temperature range of 110 DEG C and high impact overload, has the characteristics of simple structure, excellent imaging quality, high resolution, strong environmental adaptability, good processing process, easy assembly and adjustment and high yield, is suitable for mass production, and can be widely applied to the fields of optical imaging guidance, search, tracking and reconnaissance.

The application belongs to the technical field of ground penetrating radar detection, and particularly relates to a multi-channel chaotic ground penetrating radar device for city road disease detection, which solves the technical problems of poor anti-interference ability of the existing multi-channel pulse ground penetrating radar and the problem that the multi-channels cannot work in parallel, wherein the signal generation unit comprises a pulse signal generation module and a chaotic pulse signal generation module; the transmitting and receiving unit comprises N transmitting and receiving subunits, each of which comprises a local oscillator signal generator, a three-way power divider, a first / second / third frequency mixer, a first / second power amplifier, a first / second transmitting antenna, a receiving antenna, a low-noise amplifier and a signal acquisition subunit; the signal matching unit comprises N signal matching subunits, each of which comprises a pulse detector and a pulse interval matching module; and the clock control unit is connected to the pulse signal generation module, the chaotic pulse signal generation module, the signal matching subunit and the transmitting and receiving subunit respectively.

This invention relates to the field of intelligent rail transit technology, providing a track detection method, apparatus, electronic device, and storage medium. The track detection method includes: obtaining target image data representing a track region from image data acquired by a camera; obtaining target point cloud data representing the track region from point cloud data acquired by a lidar based on the camera parameter matrix and the target image data; extracting a transformation matrix from the lidar coordinate system to the track plane coordinate system based on the target point cloud data; obtaining target track data generated by projecting the target image data onto the track plane based on the camera parameter matrix and the transformation matrix; and fitting a target track equation based on the target track data. This invention's track detection scheme combines the sensing capabilities of lidar with the motion-distortion-free and pixel-dense characteristics of camera imaging, improving track detection accuracy, increasing track detection distance, and efficiently and accurately obtaining track detection results.

The present application provides a low-complexity super-resolution 3D estimation method based on millimeter-wave MIMO radar, which solves the technical problems of low angle estimation resolution, poor angle resolution and high computational complexity of existing radars. It includes: using DDM-MIMO radar to obtain discrete intermediate frequency signals, preprocessing them in the frequency domain to obtain an angle data matrix; using an angle super-resolution algorithm to calculate the angle data matrix to obtain a three-dimensional parameter estimation result; wherein, the frequency domain preprocessing includes 2D-FFT preprocessing, target detection and deambiguation by adding additional empty bands; the angle super-resolution algorithm refers to obtaining a covariance matrix through beam space conversion and real-valued transformation, and then using a multi-stage Wiener filter to obtain a signal subspace, constructing and solving the shift-invariant equation of the ESPRIT algorithm, and obtaining a three-dimensional parameter estimation result. The present application can be widely used in the technical field of millimeter-wave MIMO radar.

The invention discloses an automobile radar wave sending and truncation processing method and system, a terminal and a storage medium. The distance dimension sampling point number N1 of a radar waveform is set to be 2048 sampling points, the speed dimension chirp pulse number N2 is set to be 256 chirp pulses, the size D of each sampling point is 2 bytes, the total radar physical receiving channel number numr is 8, and the compression ratio C of a 1DFFT result is 2; the data volume Volummem of each frame is calculated according to the parameters, and it is ensured that the data volume Volummem does not exceed the 3MB upper limit cached by the radar processor L3. Performing 2048-point FFT (Fast Fourier Transform) operation on the original data of the 2048 sampling points corresponding to each chirp waveform of each receiving channel to obtain 1024 distances bins; and then data of the first 768 pieces of distance bins are intercepted from data of the 1024 pieces of distance bins, and the data are compressed to be 1 / 2 of the original data so as to adapt to the 3MB upper limit of the L3 cache. According to the invention, the RAM resource of the radar processor chip can be fully utilized, and the signal processing gain of the radar can be maintained, so that a higher output signal-to-noise ratio and a farther radar detection distance are realized.

The invention provides a safety detector and a safety detection method, the safety detector comprises a magnetic detection subsystem, and the magnetic detection subsystem comprises a magnetic detection front-end circuit, an instrument amplification circuit, a filter amplification circuit and a threshold comparison circuit; the magnetic detection front-end circuit is used for sensing a first voltage corresponding to the to-be-detected object when the to-be-detected object passes through the safety detector and outputting the first voltage; the instrument amplification circuit is used for performing differential amplification on a second voltage corresponding to the first voltage to obtain a third voltage and outputting the third voltage; the filtering and amplifying circuit is used for filtering the third voltage to obtain a fourth voltage and outputting the fourth voltage; the threshold comparison circuit is used for detecting whether the fourth voltage is in a threshold interval or not; if not, a prompt signal is output, and the prompt signal indicates that the to-be-detected object carries the detection target. According to the technical scheme, the safety detector is high in signal-to-noise ratio and long in detection distance.

The utility model discloses a low-cost light-small high-resolution common-aperture dual-waveband refrigeration optical system. The refrigeration optical system is characterized in that a first lens, a second lens, a third lens, a fourth lens, detector protection glass, a cold diaphragm and a detector photosensitive surface are sequentially arranged in the light propagation direction from outside to inside. The first lens, the second lens, the third lens, the fourth lens, the detector protection glass, the cold diaphragm and the detector photosensitive surface are coaxially arranged. The optical system is used for receiving inherent infrared radiation passing through a target and a background and converging the infrared radiation to a photosensitive surface of the medium / long wave dual-band refrigeration detector to realize photoelectric conversion, and the system has relatively high sensitivity and relatively small spatial resolution, and can obtain radiation characteristics of the target in medium / long waves at night or under complex meteorological conditions; a high-performance imaging system is realized, and detection advantages and complementarity of different spectrum bands can be fully utilized to detect, identify and accurately position a target in a complex environment.

The present invention belongs to the field of polar acoustic technology, and specifically relates to a method and device for locating pulse sound sources on ice using a single vector hydrophone, and performing cross-ice positioning in sea areas covered by polar sea ice. Existing methods cannot well realize the construction of a three-dimensional observation platform in polar regions, and it is necessary to develop new communication technologies to overcome this problem and improve the information transmission capabilities between submarines and other communication equipment. Based on the theory of polar sound propagation, the present invention explores the mapping relationship between the arrival time of different modal wave fields and the spatial position of the sound source, and utilizes the characteristics of the vector hydrophone that can simultaneously receive the amplitude and direction information of the sound wave velocity, and implements the evaluation of the height and distance of the air pulse sound source based on a single array element. The signal attenuation in a complex ice and water environment is reduced, and the signal propagation quality is improved. The cross-medium detection of airborne sound sources underwater can be realized more covertly, while reducing costs and construction risks.

The utility model discloses an induction type ceiling lamp which comprises an inductor, an installation disc, a diffusion ring, a back plate, a light source belt, a shell, a light source plate, a light-transmitting panel and a power source driver. A light source belt is laid around the edge of the upper surface of the light source plate; the light source plate with a light source belt is arranged at the bottom of the back plate; the light-transmitting panel is assembled in the shell and is positioned below the back plate in the shell; the diffusion ring is arranged on the upper surface of the back plate; a power supply driver and a sensor are assembled on the inner side of the mounting disc, and the mounting disc is fixedly connected with the back plate through a fastener; and the back plate is provided with a light outlet hole site. According to the utility model, the microwave sensor is adopted to control the work, the sensitivity is high, the detection distance is long, the influence of light, temperature and airflow is small, and the spatial position of a target and the movement of a human body can be detected in a larger spatial range, so that the lamp is controlled to be automatically turned on and turned off, intelligence and energy conservation are achieved, and the practicability and intelligence are remarkably improved.

The invention relates to a radar device, a transportation carrier and a control method of the transportation carrier, the radar device is applied to the transportation carrier, the transportation carrier comprises a detection module used for detecting the current vehicle speed of the transportation carrier, the radar device comprises an installation part, a radar, a driving mechanism and a covering part, and the installation part is used for being installed on the transportation carrier; the radar is mounted on the mounting part and is used for transmitting and receiving radar signals; the driving mechanism is mounted on the mounting part and is electrically connected with the detection module; the covering part is in transmission connection with the driving mechanism, and the driving mechanism is configured to drive the covering part to move according to the detection information of the detection module so as to expose the signal receiving and transmitting side of the radar or enable the covering part to cover the signal receiving and transmitting side of the radar. Under the arrangement of the embodiment, the detection effect of the radar device is good, and the safety performance of the transportation carrier is greatly improved.

The invention relates to a compact medium-wave infrared continuous zooming optical system with a large zoom ratio, which realizes continuous zooming with a focal length of 22-690mm, and comprises a front fixed group, a zoom group, a compensation group, a rear fixed group, a reflector group and a secondary imaging group which are sequentially arranged from the infinity of an object space to a focal plane of an image space, the front fixed group is sequentially provided with a positive meniscus lens A and a negative meniscus lens A from an object side to an image side; the zoom group is a biconcave negative lens B; the compensation group is a biconvex positive lens C; the rear fixing group is a biconcave negative lens D; the reflector group is sequentially provided with a first reflector E, a second reflector E and a third reflector E from the object space to the image space; and the secondary imaging group is sequentially provided with a positive meniscus lens F, a negative meniscus lens F and a biconvex positive lens F from the object side to the image side. The optical system is reasonable in design, has the advantages of high zoom ratio, high resolution, small optical axis drift distance, long detection distance, good imaging effect, compact structure and the like, and meets smooth zoom group and compensation group curves in a full-focus section.

The application discloses a kind of single-pixel imaging method and device based on array light source, including obtaining the illumination light field of array light beam and the back light intensity detection value of the reflection back after array light beam irradiation on target object;Based on back light intensity detection value and illumination light field, reconstruct target image as rough target image;Based on rough target image and back light intensity detection value, reconstruct target image using depth neural network without training, output final target image.The present application realizes high efficiency imaging and long distance target detection based on array light source, while removing image noise, artifact and periodicity by introducing depth neural network, further improves the imaging quality and imaging efficiency of single-pixel imaging.

The present invention discloses a laser radar scanning method and a computer-readable storage medium. The method comprises: a first light deflection device deflects a light beam emitted by a light source by a plurality of first deflection angles along a first direction; the length of the light beam emitted by the light source along the first direction is less than the length along a second direction; a second light deflection device deflects the light beam deflected by the first light deflection device by a plurality of second deflection angles along a first direction and a second direction to project a scanning light beam; the length of the scanning light beam in the first direction is less than its length in the second direction; the second deflection angle of the incident light beam deflected by the second light deflection device is adjusted by controlling the working voltage applied to the second light deflection device, and the corresponding working voltage applied is fine-tuned according to the incident angle of the light beam incident on the second light deflection device; wherein, for the same second deflection angle, different incident angles correspond to different working voltages.

The invention discloses a dual-band infrared image decision fusion detection method of a monocular Cassegrain structure, including building a binocular vision platform of medium-wave infrared and Cassegrain structure long-wave infrared; obtaining medium-wave and Cassegrain structure long-wave UAV target images; constructing a KAN_yolov10 pre-detection head; using a multi-scale feature fusion module to fuse the medium-wave and Cassegrain structure long-wave UAV target images to obtain a fused image of the UAV target; inputting the fused image into the KAN_yolov10 pre-detection head, and outputting the detection result of the UAV target. The method of the invention uses hardware equipment to enlarge the region of interest, enhance the characteristics of the UAV target, and improve the detection accuracy of weak targets in complex backgrounds through decision-level fusion without the need for completely strict pixel alignment.

The application belongs to the technical field of optical imaging, and particularly relates to a small-F-number long-waveband infrared imaging optical system, which comprises an aperture plane, a first lens, a second lens, a third lens and an image plane; the first lens is a positive lens made of IRG206 material, and the second surface thereof is an aspheric surface; the second lens is a negative lens made of ZNS_IR material; and the third lens is a positive lens made of IRG204 material; the application adopts a 3-lens structure, has low material cost, high system transmittance, long detection distance, small relative aperture and F number=1; and expensive germanium material is replaced by low-cost materials such as zinc sulfide (ZNS_IR) and chalcogenide glass (IRG206), so that the application has the advantages of cost and mass production.

The present invention discloses a holographic joint monitoring method and device for the prestress and internal defects of an existing structure. By installing a piezoelectric ultrasonic transducer at the end of the prestressed tendon of an internal prestressed concrete structure, an ultrasonic guided wave method is used to detect the internal corrosion and grouting void defects of the structure. The method has the advantages of long detection distance, high detection accuracy, fast detection speed, and no need to repeatedly move the transducer. The present invention takes into account the influence of different prestress levels on the ultrasonic guided wave group velocity, and uses the grouting void coefficient and the corrosion coefficient to achieve simultaneous monitoring of the above two types of damage; finally, the present invention combines holographic simulation means to restore the monitoring signal and damage characteristics and improve the monitoring accuracy. Therefore, the joint monitoring method of the present invention has a simple process, is easy to operate, and has a low cost. It can be used for the detection of prestressed tendons, corrosion, and grouting voids in internal prestressed concrete structures of different specifications. It has strong applicability and is conducive to popularization and application.