50results about How to "Realize long-distance detection" patented technology

The invention relates to a remote traffic sign detection and recognition method based on F-RCNN, which comprises: 1, preprocessing the traffic sign image sample set; 2, pre-training VGG-16 in F-RCNN;3, inputting the traffic sign training data set to the VGG-16 to complete feature extraction; 4, constructing a fusion feature map; enabling the region generation network RPN in the F-RCNN to performregion generation according to the fusion feature map to obtain a candidate region of the traffic sign; 6, inputting all candidate regions to the RoI-Pooling layer in the F-RCNN to generate a fixed-size feature vector; 7, sending the feature vector to the extreme learning machine network to output the category and location of the traffic sign; 8, training the F-RCNN model by the contribution adaptive loss function; 9, completing the traffic sign detection and identification of the actual scene. The invention realizes the detection and identification of the long-distance traffic sign, and the recognition precision is high.

The invention discloses a far-distance human-body-hiding hazardous article detector based on the radar target polarization characteristic. The detector comprises a display control end, a signal processing and control module, a linear frequency modulation source module, a transceiving frequency doubling link module, a clock distributing module, a medium-frequency amplification filtering module and a signal acquisition module. The linear frequency modulation source module provides linear frequency modulation signals to the transceiving frequency doubling link module. The transceiving frequency doubling link module conducts frequency doubling and amplifying on the linear frequency modulation signals provided by the linear frequency modulation source module so that the frequency of the linear frequency modulation signals can reach the designated frequency band and the linear frequency modulation signals can irradiate a detected object, reflection echoes of the detected object are received, processed and then transmitted to the medium-frequency amplification filtering module and finally return to the display control end. The display control end counts the distribution of strength values of two perpendicular routes of echoes of the detected objects according to the received multi-acquisition data, so whether the detected object carries a hazardous article or not can be effectively detected, far-distance detection can be achieved, security check can be conducted on high-density people in open places, and the detected object does not need to cooperate actively.

The invention discloses a novel composite sensing optical cable comprising a carbon fiber filament, temperature-sensitive fibers, power supply wires, a sheath, and an insulating wrapping layer. The carbon fiber filament, the temperature-sensitive fibers, the power supply wires, and the sheath are wrapped in the insulating wrapping layer. The carbon fiber filament is wrapped in the sheath. More than one temperature-sensitive fiber and a pair of the power supply wires are provided. The carbon fiber filament and the surrounding power supply wires are in crossed connection so as to form a parallel circuit. Power is supplied simultaneously such that the optical cable is uniformly heated at long distance by means of a fact that the carbon fiber filament generates heat after being supplied with power. The temperature-sensitive fibers are wrapped in the carbon fiber filament or arranged in parallel with the carbon fiber filament. The carbon fiber filament is heated after being supplied with power so as to uniformly heat the optical cable. Temperature measurement at various points along the cable is achieved by means of distributed fiber temperature measurement technology. The optical cable can be uniformly heated for long distance (more than 2km) and long-distance leakage can be detected.

The invention discloses a weak target detection method based on automobile millimeter wave radar, a tracking method and a system. The weak target detection method based on automobile millimeter wave radar comprises the following steps of estimating the corresponding target angle of an echo signal in each period according to a corrected linear frequency modulation continuous wave signal in each period and the corresponding echo signal in each period; comparing whether the target angles of the echo signal in a plurality of coherent processing periods are consistent or not; if the target angles of the echo signal in the plurality of coherent processing periods are consistent, judging that a target to be resolved corresponding to the echo signal is a real target; and if the target angles of the echo signal in the plurality of coherent processing periods are not consistent, judging that the target to be resolved corresponding to the echo signal is a false target. Compared with the prior art, the weak target detection method based on automobile millimeter wave radar belongs to a low-signal-to-noise ratio target detection technology with the advantages that the goal of detecting a weak target in a long distance can be achieved; meanwhile, the number of false targets is greatly reduced; and the low-false-alarm-probability constraint is finally realized.

The embodiment of the invention provides a target object positioning method and device, a robot and a storage medium. The method comprises the steps: obtaining coordinate information of the robot under a geocentric geodetic coordinate system, the distance between a target object and the robot and the azimuth angle and the pitch angle of the target object relative to the robot; secondly, accordingto the distance between the target object and the robot and the azimuth angle and the pitch angle of the target object relative to the robot, determining first coordinate information of the target object under a station center horizon rectangular coordinate system; then, converting the first coordinate information into second coordinate information under a geocentric geodetic coordinate system according to the coordinate information of the robot and a conversion relationship between a station center horizon rectangular coordinate system and the geocentric geodetic coordinate system; visibly, the robot provided by the embodiment of the invention realizes long-distance detection of the position coordinates of the target object.

The invention discloses a state monitoring method and system for power cable terminal equipment based on an infrared thermogram. The method comprises the steps of segmenting a foreground region and a background region of target power cable terminal equipment for a to-be-processed infrared thermogram i; calculating a temperature average value Ta of the background region, dividing the foreground region into foreground sub-regions, and calculating a temperature average value TN in the foreground sub-regions; and judging whether the target power cable terminal equipment has a fault or not according to the temperature difference between the temperature average value TN in the foreground sub-region of any m-th row and n-th column and the temperature average value Ta in the background region. Infrared temperature measurement is an effective means for discovering the overheating defect of the cable terminal, various cable terminal defects are analyzed through background temperature differences, the monitoring efficiency can be effectively improved, the working temperature state of the target power cable terminal equipment can be accurately and timely judged, and method has the advantages of high detection accuracy, capability of realizing remote detection, safety and reliability.

The invention discloses a flight detecting device, an imaging system and a radiation detecting method thereof. The flight detecting device comprises a plurality of communicated aircrafts. Each aircraft comprises a detecting module, a flight transmission module and an overhead control module, wherein the detecting module is configured to perform detection according to an obtained detection indication instruction, and comprises a scintillating crystal for receiving radioactive rays transmitted by a target object and generating corresponding optical signals and a photoelectric converter for converting the optical signals into electric signals; the flight transmission module is configured to bear the detecting module and perform flying according to an obtained flight indication instruction; the overhead control module is configured to control operation of the detecting module and the flight transmission module according to an obtained task instruction and send detecting data to a ground monitoring device according to feedback information sent by the detecting module and/or the flight transmission module so as to determine the position of the target object. By means of the technical scheme, the purpose of remotely detecting the target object can be achieved.

The invention discloses a bridge suspender damage and wire breakage detection device based on a magnetostriction method, and the device comprises: a coil assembly mechanism which comprises more than two arc-shaped substrates, wherein all arc-shaped substrates surround the outer side of a suspender to form a fixed substrate structure; a coil unit which comprises an exciting coil and a receiving coil, wherein the exciting coil and the receiving coil are wound on the outer side of the base body structure; a magnetic circuit permanent magnet structure which comprises a yoke, wherein more than onegroup of permanent magnet units are arranged on the yoke, each group of permanent magnet units comprises a saddle piece, a permanent magnet and a clamping piece, and the permanent magnet is connectedwith the yoke and used for generating a uniform magnetic field, the saddle piece is used for connecting the permanent magnet and the clamping piece, and the clamping piece is used for being connectedwith a coil assembling mechanism to form a clamping type fixing structure. The bridge suspender damage and wire breakage detection device has the advantages of the simple and compact structure, simpleand convenient assembly, the wide application range and the like.

The invention relates to the technical field of gap detection on aircrafts, in particular to a gap detection tool special for airplanes and a using method. The gap detection tool comprises a handle and a detection elbow, the handle is detachably connected with the detection elbow, the detection elbow extends into a gap, and if the detection elbow cannot smoothly extend into the gap, is it indicated that the gap width is unqualified; and if the detection probe can smoothly enter the gap, the detection elbow moves along the gap extension direction, and if the detection elbow moves smoothly, it is indicated that the gap is qualified, and otherwise, it is indicated that the gap is unqualified. According to the technical scheme, the gap detection tool special for the airplane is provided for gap detection in all areas of the airplane, the structure is simple, the cost is low, the narrow and complex space gap detection which cannot be achieved through detection means, such as optics, calipers, etc., can be achieved, and the technical scheme is convenient and fast to implement. The rapid detection of gaps can be realized after airplane conduits and cables are installed, the reliability ofdetection results can be ensured, and meanwhile, the high detection efficiency is achieved.