504 results about "Microwave detection" patented technology

The invention relates to a road measuring method, a device and a non-stop charging system. The method comprises the following steps: adopting a microwave transaction module for carrying out information interaction with on-vehicle microwave equipment running on a road to be measured; adopting a plurality of microwave positioning modules for simultaneously intercepting and capturing the microwave signals sent by the on-vehicle microwave equipment to the microwave transaction module; using each microwave positioning module for calculation to generate the respectively obtained microwave signal intensity data; determining the position of the on-vehicle microwave equipment in the road to be measured according to each generated microwave detection signal intensity datum; determining the distancefrom the on-vehicle microwave equipment to the microwave transaction module according to the position of the on-vehicle microwave equipment in the road to be measured; and determining whether the information interaction between the current microwave transaction module and the on-vehicle microwave equipment can be continued or not according to the distance from the on-vehicle microwave equipment to the microwave transaction module. The invention aims at solving the problems of signal interference and lack when the on-vehicle microwave equipment in an electronic charging system is positioned inthe edge of a communication region, and solving the problem of low accuracy of the pike charging caused by signal interference and lack.

The invention discloses a method for controlling microwave vehicle detecting radar, comprising the following steps: microwave detecting radar work parameter is evaluated; pulse compression in the range direction is carried out; sub-echo of each target vehicle is respectively extracted, and whether advancing vehicle exists is judged, speed search is carried out on data of each sub-echo of advancing vehicle, one matched filtering function is obtained after each search, pulse compression in the azimuth direction is carried out, and then the kurtosis value is calculated; if the largest kurtosis value is obtained, the search speed corresponding to the largest kurtosis value is the traveling speed of the vehicle, frequency modulation slope in the azimuth direction is calculated according to the speed and pulse compression in the azimuth direction is carried out, and then signals of each range gates are added and are compared with the set threshold to obtain vehicle length; if the largest kurtosis value is not obtained, then search is kept on by returning to the previous step. The invention has numerous monitoring lanes, wide detection range and more precise detecting speed, can detect vehicle with low speed or even standing vehicle precisely, and can estimate vehicle length, thereby facilitating traffic control.

The invention relates to the field of intelligent traffic, in particular to a dynamic traffic flow prediction method based on space-time correlation. The method comprises the steps that a space-time matrix is established after traffic flow data are preprocessed, an adjacent local linear reconstitution method is used for training the space-time matrix, a set of adjacent and weight values used for prediction are found out, prediction is conducted after non-negative correction, and at last the space-time matrix is updated through a prediction value. The dynamic traffic flow prediction method based on space-time correlation has the advantages that the adaptability is high, the method is suitable for any microwave detection road section; the feasibility is high, the data can be trained and predicted as long as a historical traffic flow database is given; the calculation speed is high, the complexity is low, and the calculation time is in a second level; the prediction precision is high, the randomness and volatility of dynamic data are removed, and the accuracy and reliability of a prediction result are improved; the prediction efficiency is high, multi-step traffic flow prediction of multiple five-minute time periods can be achieved, and high-efficiency short-time and long-time traffic flow prediction can be achieved.

The invention discloses an automatic motor vehicle over-speed monitoring system. In terms of the technical proposal, the system comprises a microwave detection module which is used for projecting a detection area on a detected road, detecting vehicles passing the detection area, and sending the obtained detection data; a video snapping module which is used for identifying and snapping vehicle license plates of the vehicles in a video stream detection manner when the microwave detection module detects the vehicles passing the detection area and sending the snapped images; an information processing module which is used for receiving the detection data sent by the microwave detection module and the snapped images sent by the video snapping module, matching the detection data and the images, and then comparing with the set standard speed value to obtain information of the over-speed vehicle. The system has high detection efficiency, high snapping precision and low manufacturing cost.

The invention provides an overflow control method for a city intersection based on a wide area radar microwave detector. The overflow control method gives the concept of overflow of the intersection from the aspect of signal control ability, the wide area radar microwave detector is installed, and the current operating condition of the intersection is judged according to the regional vehicle number collected by the detector, overflow coefficient built by space occupancy and average speed of road condition information. After the condition that the intersection is in overflowed state is judged by the overflow coefficient, traffic congestion is eased by using the method of changing the timing scheme, and the signal control resource method is provided.

The invention discloses a smart city cloud street lamp system comprising a street lamp lighting device, a traffic signal lamp system, a real-time traffic information board, a personal mobile navigation terminal, and a cloud network processing center. The street lamp lighting device is integrated with a microwave detector and a high-speed digital processor, and the high-speed digital processor calculates vehicle speed and traffic information according to the information detected by the microwave detector and sends the vehicle speed and traffic information to the cloud network processing center. The personal mobile navigation terminal transmits the target location, preset driving route and real-time speed information of a vehicle equipped with the personal mobile navigation terminal to the cloud network processing center. The cloud network processing center carries out operation processing of the information transmitted by the street lamp lighting device and the personal mobile navigation terminal and then transmits the information to the traffic signal lamp system, the real-time traffic information board and the personal mobile navigation terminal. The system can actively induce vehicle shunting and automatically offer a quickest route to the vehicle owner.

The invention provides a freeway management system. The freeway management system consists of a three-level management structure, namely a freeway provincial monitoring management center, a municipal monitoring management center and a front-end infrastructure monitoring unit, wherein information of the front-end infrastructure monitoring unit is gathered to the municipal monitoring management center, and is gathered to the provincial monitoring management center through the municipal monitoring management center, so that the linkage is realized. The front-end infrastructure monitoring unit comprises a microwave detector for detecting parameters, such as road section speeds, traffic flows, vehicle distances and vehicle models, a surveillance camera, a broadcasting system, a system server and a management host. The microwave detector, the surveillance camera and the broadcasting system are respectively connected with the system server and the management host.

The invention relates to an ultra-wideband millimeter-wave linearly-polarized waveguide aperture array antenna, belonging to the technical field of microwave detection. In the waveguide aperture array antenna, a multi-power-dividing feed network is combined with a waveguide aperture radiation array, and an antenna is simulated and designed by applying the thought of integral design of an antenna feeder system. By changing the amplitude of each port of an HT power divider network, the characteristics of low standing wave, high grain, low minor lobe and wide wave beam are realized, an ultra-large frequency bandwidth is realized, and the ratio of the frequency bandwidth to the central frequency is up to 6.6 percent. On the aspect of structure, the entire antenna comprises a bottom plate, a feed network and a radiation portion, thereby greatly reducing the workload of simulation and machining, reducing the processing error to the maximum extend, reducing the size and weight of the antenna, and achieving adaptation to various occasions and experiments. The antenna is capable of receiving / transmitting signals at the same time, is suitable for Ka waveband communication and detection, and is suitable to be applied to communication systems, navigation systems and radar systems of various fixed and movable platforms.

The invention belongs to the field of measurement and detection, and particularly relates to a device for detecting a parking space in a parking lot and a detection method. The device for detecting the parking space in the parking lot is arranged below the ground of the parking space and comprises a geomagnetism detection device, a microwave distance measuring device, a data processing module and a data transmitting module, wherein the geomagnetism detection module and the microwave distance measuring device are connected with the data processing module, the data processing module is connected with the data transmitting module, and the data transmitting module is in wired or wireless communication connection with a parking lot background management system. According to the invention, the parking space state is measured by using the detection device combining geomagnetism detection with low power consumption and microwave detection with high accuracy and the detection method, thereby realizing detection for the parking space with low power consumption and high accuracy.

A humidity sensor which utilizes microwave energy to determine a particular humidity value, e.g., a relative humidity, a specific humidity, or a dew point, without the need for delicate moving parts. The microwave humidity sensor requires little if any maintenance over a significantly long operational life, and is capable of highly accurate humidity measurements even at the extremes (e.g., toward 0% relative humidity and toward 100% relative humidity. In the disclosed embodiment, a microwave generator / transmitter is continuously or periodically pulsed to cause a known amount of microwave energy to be propelled through a metal tube structure, e.g., a waveguide tube structure. A microwave detector measures the amount of microwave energy at the other end of the tube structure. A processor measures the temperature of the ambient air within or just outside the tube structure and the pressure, and by measuring the output of the detector determines the amount of microwave energy which was absorbed during the passage through the tube structure. Given the amount of microwave energy absorbed and the temperature and pressure of the ambient air, a value for a desired humidity value is determined using interpolation as necessary from a look-up table containing empirically obtained absorption and temperature / pressure values for given humidity values.

The invention relates to a microwave remote sensing soil moisture monitoring system and a monitoring method thereof. The monitoring system comprises a detection arm, a signal receiving antenna and a thermal infrared thermometer carried on the detection arm, a microwave detection system electrically connected with the signal receiving antenna and the thermal infrared thermometer, and a data processing device electrically connected with the microwave detection system. According to the monitoring method, a data analysis treatment system in the data treatment device performs the real-time synchronous treatment according to brightness temperature data acquired by the microwave detection system and physical temperature data on the surface of soil obtained by the thermal infrared thermometer to accurately evaluate soil moisture information. The microwave remote sensing soil moisture monitoring system and the monitoring method thereof provided by the invention obtains soil microwave radiation signals by using a passive way, has a simple working model, high precision, and high efficiency, and is not limited by the observation frequency.

The invention provides a crack detection sensor based on a microstrip antenna and a detection method thereof. The invention is characterized in that the crack detection sensor comprises a dielectric substrate, one surface of the dielectric substrate is provided with a conductor patch through etching, deposition or corrosion, and the other surface of the dielectric substrate is adhered on a to-be-detected structure to form the complete sensor. According to the invention, a relationship between the length and the direction of a crack and resonant frequencies of radiation modes respectively parallel to the length direction and the width direction of the patch of the microstrip antenna can be established, and the length and the direction of the crack can be obtained based on the shifts of the resonant frequencies. The crack detection sensor based on the microstrip antenna provided by the invention has the advantages of a small size, light weight, low profile, capacity of being conformal to a carrier, simple manufacturing, low cost, etc.; moreover, the crack detection sensor employs microwave detection technology, which facilitates wireless detection and signal processing.

The invention discloses a local maximum value based vehicle radar target detection method. The local maximum value based vehicle radar target detection method includes the following steps that step one, a microwave detection device on the road surface uploads collected echoes to an upper computer through a serial port, radar echo distribution conditions of the road surface are observed through the upper computer, and radar echo areas are partitioned; step two, the range of a search window is calculated according to a distance resolution ratio of frequency modulation continuous wave (FMCW) radar and width information of a lane; step three, all lane echo points extracted in the step one are traversed, the search window in the step two is set in the neighborhood of each echo point for each echo point, and subsequently, the echo point is compared with other echo points in the search window; step four, whether an echo intensity value of a searched local maximum value point is larger than a set echo threshold is judged, the searched local maximum value point is a target point if the searched local maximum value point is larger than the set echo threshold, and otherwise, the searched local maximum value point is considered to be a non-target point; step five, the target point is marked, and an echo signal is turned into a two-value signal so as to achieve target detection.

The invention relates to the technical field of microwaves and particularly relates to a coaxial resonant cavity and applications thereof. The coaxial resonant cavity comprises a coupling mechanism and a cavity body, wherein the coupling mechanism is used for excitation or coupling of microwaves in the cavity body; the coaxial resonant cavity also comprises a probe extending out of the cavity body, and the probe and the cavity body are coaxially set; the cavity body is a circular column, and the ratio of the exradius to the inradius of the circular column is (3-5) to 1. On the basis of not reducing the size of the coaxial resonant cavity, through controlling the ratio of the exradius to the inradius of the circular column to be (3-5) to 1, the resonant efficiency can be effectively improved. The invention also provides a material dielectric constant test system, a microwave detection device, a filter and a microwave sterilization device by adopting the coaxial resonant cavity.

The invention belongs to the technical field of biomedical detection, and relates to a method for extracting a microwave detection breast model based on medical magnetic resonance imaging. The method includes the steps: acquiring a T1 weighted magnetic resonance image of a breast portion; enhancing a boundary; performing gray discrete processing; calculating the water content of a tissue corresponding to each pixel for a thoracic gland portion in the magnetic resonance image by the aid of an image gray value; comparing the water content of the tissue corresponding to each pixel with typical water content data of each tissue of a normal human body, determining tissue information of each pixel and defining the pixel as an islet if the tissue information of the pixel cannot be determined; giving the same gray value to the pixels with the determined tissue information and belonging to the same tissue, and normalizing the gray of the magnetic resonance image according to the tissue information; corroding small discrete islets; building the breast model. A breast structure can be really simulated by the method.

A method and apparatus for remotely monitoring properties of gases and plasmas is disclosed. A laser beam is focused at a desired region within a gas or plasma to be analyzed, generating an ionized sample region in the gas or plasma. A beam of microwave radiation is directed toward the ionized sample region, and a portion of the microwave radiation is scattered by the ionized sample region and Doppler-shifted in frequency. The scattered, frequency-shifted microwave radiation is received by a microwave receiver, and is processed by a microwave detection system to determine properties of the gas or plasma, including velocities, temperatures, concentrations of molecular species, and other properties of the gas or plasma.

The invention discloses a microwave photon multiband radar detection method. Specifically, a multiband microwave detection signal generation method comprises the following steps of: combining M pathsof direct-current optical carriers with different wavelengths, and dividing the combined direct-current optical carriers into two paths; modulating a broadband linear frequency modulation signal in one path to generate a sweep-frequency optical frequency comb with M sweep-frequency comb teeth, and keeping the interval between the sweep-frequency comb teeth the same as the wavelength difference ofa corresponding direct-current optical carrier; modulating the other path of optical signal into a single-frequency radio frequency signal to generate a multi-wavelength optical frequency comb signal,and then separating M comb teeth with known wavelengths contained in the multi-wavelength optical frequency comb signal; combining the sweep-frequency optical frequency comb and M comb teeth with known wavelengths into one path, and then performing photoelectric conversion so as to obtain a multiband microwave detection signal. The invention also discloses a microwave photon multiband radar. Themethod has the advantages of high frequency and large bandwidth of photon technology, real-time and high-resolution multifunctional detection can be realized, and the problem of frequency overlappingduring dechirping processing of multiband echo signals is solved.

The invention relates to an alarming system, in particular to an intelligent household alarming system. The system mainly comprises a main unit, a smog alarming device, a flammable gas alarming device, an anti-theft alarming device, a shooting alarming device and a user cellphone. The main unit is in wireless connection with each alarming device and the user cellphone, receives alarming signals sent by each alarming device and sends short messages and multimedia messages to the user cellphone through a GSM (global system for mobile communications) module to facilitate a user to take timely measures. The wireless connection is adopted among all the parts, so that wiring is reduced, and cost is lowered. In addition, the anti-theft alarming device adopts both infrared detection and microwave detection, accuracy rate is greatly increased compared with that of previous single infrared detection, and false alarming rate is effectively lowered.

The invention discloses a method for detecting vital signs in a non-contact mode by terahertz waves. The method comprises the steps that a system for detecting the vital signs in the non-contact mode by the terahertz waves is arranged, a transmitting antenna and a receiving antenna of the system are arranged at the equidistant positions of a detected life body, and the detection signals of the detected life body are sampled; after time-frequency transformation is conducted on the sampled detection signals twice, the movement frequency signals, the respiration signals and the heartbeat signals of the detected life body are extracted after time weighting is conducted. According to the method for detecting the vital signs in the non-contact mode by the terahertz waves, the detection sensitivity is higher than that of microwave detection in the prior art, and meanwhile the vital sign data obtained by detection through the method are more precise and accurate. The method can be widely applied to the fields of medicine, rescuing, security and the like, for example, non-contact heartbeat monitoring, automatic personal health detection, chronic health condition diagnosis and even personnel searching in earthquakes or snow crashes can be achieved.

The invention discloses a microwave detection method and microwave detection equipment for moisture contained in coal on mine conveyor belts, and belongs to the technical field of the detection of water content in the coal. The microwave detection method comprises the steps of: 1) determination of microwave frequency; 2) determination of the relation between the water content of the coal and the attenuation of microwave signals; 3) error correction; and 4) acquisition of the water content of the coal by fitting a relation curve between the attenuation of the microwave signals and the water content of the coal. The method can quickly detect the water content of the coal on the conveyor belts, is not susceptible to the external environment, and is suitable for detecting the moisture contained in the coal on the conveyor belts.

The invention relates to a microwave online detection and removal method for a composite filter rod. According to the method, online detection and removal of splicing gaps of filter rods, dislocation of the filter rods and phase deviation defects are realized by employing a microwave detection technology. The method can rapidly, reliably and safely detect and remove the splicing gaps of the filter rods of cigarette, dislocation of the filter rods and phase deviation defects in real time; the method has the characteristics of high detection speed, accurate measurement result, high reliability and high safety to bodies of operators; moreover, various composite filter rods can be detected on line, and products with quality defects can be removed in real time.

A system and method are provided for automatically detecting intrusion in an off-limits zone. The system includes a transmitter transmitting a signal along a path likely to encounter an intruder to the off-limits zone and a modulating reflector for receiving the transmitted signal. The modulating reflector includes a modulator receiving the received signal and generating a modulated signal having a characteristic. The modulating reflector transmits the modulated signal to be received by a receiver located to receive the modulated signal. The system further includes a processor coupled to the transmitter and to the receiver, the processor being configured to process the received modulated signal and to initiate an action as a function of the characteristic in the received modulated signal.

The invention provides a parking space state detection device and a parking space state detection method. The parking space state detection device comprises a geomagnetic sensor and a microwave detection device which are arranged in a parking space to be detected and mutually connected, wherein the geomagnetic sensor is used for generating a driving signal when parameters of a geomagnetic force in a region of the parking space to be detected are detected to be changed and sending the driving signal to the microwave detection device; and the microwave detection device is used for receiving the driving signal, transmitting microwave signals of at least one frequency band according to the driving signal, receiving returned echo data, and determining parking space state change conditions of the parking space to be detected and a changed parking space state of the parking space to be detected according to the echo data, reference echo data corresponding to a parking space state of the parking space to be detected and a set sparking space state change threshold. The parking space state detection device is not susceptible to influences of magnetic field variations nearby the parking space, variations in vehicle moving speed and the external environment, and the accuracy of a detection result is improved. Meanwhile, the whole detection device is ensured to be low in power consumption, and the cost is saved.

The invention belongs to the technical field of food processing, and relates to a dual-belt type microwave quick sterilizing device. The dual-belt type microwave quick sterilizing device comprises a dual-conveyer-belt transporting device (4). The dual-belt type microwave quick sterilizing device is characterized in that the belt speed of the dual-conveyer-belt transporting device (4) can be adjusted according to different materials; sterilizing resonance cavities (17) are arranged on a single conveyer belt, and are mutually independent; a vertical wave guide pipe (16) communicates with the corresponding sterilizing resonance cavity (17); an independent microwave adjusting switch (12) and a microwave detecting device (11) are arranged on the vertical wave guide pipe (16), and the sterilizing process of each sterilizing resonance cavity can be controlled through a microwave master console (5), and the number of the microwave resonance cavities (17) can be increased and reduced to changethe microwave sterilization efficiency. The dual-belt type microwave quick sterilizing device disclosed by the invention is reasonable in structure, energy-saving, low in consumption, is suitable forfoods of different sizes and kinds, economical and practical, safe and environmental-friendly.

The invention relates to a microwave detection technology, particularly relates to a microwave induction method and device based on Rydberg atoms, and solves the technical problems that current equipment for microwave field detection easily disturbs a microwave field. The microwave induction method based on the Rydberg atoms comprises the following steps: (a) after combining two beams of laser and expanding the combined beams, and emitting the laser into a transparent sample tank filled with alkaline metal atom steam; (b) filtering laser which is emitted out from the sample tank and has the frequency the same as that of a second laser beam, acquiring residual laser signals and converting the laser signals into corresponding electric signals; and (c) if the microwave field exists at the position of the sample tank and signals with the reduced strength of the first beam of the laser are acquired, judging that the microwave field exists at the position of the sample tank. According to the microwave induction method and device based on the Rydberg atoms, the problems of an existing microwave induction technology that the volume is large and the detection sensitivity is low are solved. With the adoption of the microwave inductor based on the Rydberg atoms, whether the microwave field exists in the environment or not can be measured rapidly and accurately.

The invention discloses a microwave laser radar integrated system, and belongs to the field of microwave detection. The invention solves problems that a conventional radar detection system cannot achieve high resolution and long detection distance at the same time while the detection process is not affected by the weather. A microwave radar and a laser radar are integrated in one system, so the advantages of the two detection modes are integrated. The system can carry out the flexible switching of the two modes according to different detection environments and different detection requirements, so as to meet the actual demands. The system is large in measurement range, is high in measurement precision, and is wide in application range. Meanwhile, the system employs a common signal modulation and demodulation system, so the system is compact in structure, is high in stability, and is high in flexibility. The system is mainly used for the measurement of the distance of a to-be-measured object.

The invention discloses a human body activity posture monitoring method and system and a human body posture monitor, wherein the method comprises the following steps: receiving a microwave detection signal, wherein the microwave detection signal is a detection signal obtained after performing microwave scanning on a target area; according to the microwave detection signal, judging whether the current activity posture of a preset human body in the target area is in a dangerous posture range, wherein the current activity posture is the action form of the human body at a position at the current time point; and when the current activity posture of the preset human body in the target area is in the dangerous posture range, sending out an alarm signal. According to the human body activity posture monitoring method and system and the human body posture monitor in the invention, the technical problem whether a user is in a dangerous state cannot be determined due to the fact that the activityenvironment with large fog concentration cannot be monitored in the related art is solved.