79 results about "Passive sensing" patented technology

The invention relates to the technical field of optical cable monitoring, and discloses an optical cable early warning method based on passive sensing integration, and the method comprises the steps: carrying out the passive sensing signal collection of an optical cable disposed in a target region, so as to obtain a disturbance signal transmitted along the optical cable; performing preprocessing operation on the disturbance signal to obtain a normalized disturbance signal sequence; meanwhile, environment data are collected through a multi-parameter sensor network; preprocessing the disturbance signal and the environment data, constructing a multi-dimensional feature vector containing gas concentration sudden change features, temperature distribution abnormity and vibration frequency-amplitude, performing disturbance event identification based on the multi-dimensional feature vector, and determining corresponding disturbance event data; and combining the disturbance event data with the spatial distribution of the optical fiber sensing signal and the vibration wave propagation time difference, positioning the positioning result data corresponding to the occurrence of the abnormal event, generating an early warning instruction based on the positioning result data, and pushing the early warning instruction to the user terminal through the monitoring platform. According to the invention, the accuracy of optical cable safety monitoring can be improved.

The invention provides a passive perception radar target classification method and system based on electromagnetic detection feature extraction, and the method comprises the steps: carrying out the multi-dimensional signal decomposition of an original scattered signal sequence through obtaining an electromagnetic radiation signal set of a target region; obtaining a time-frequency distribution feature set and a polarization response feature set corresponding to each signal acquisition period, extracting a target electromagnetic feature combination from the time-frequency distribution feature set and the polarization response feature set according to a preset electromagnetic feature association rule, generating a weight distribution parameter, and performing weighted fusion processing on the target electromagnetic feature combination to obtain a target electromagnetic feature combination; and the fusion feature vector set is input into an adaptive classification network, hierarchical classification operation is performed on the fusion feature vector set, the category identifier of the target scatterer and the corresponding classification confidence are output, and a radar detection optimization instruction is generated based on the category identifier and the corresponding classification confidence. According to the method, high-precision distinguishing of multiple types of scatterers is achieved under the passive sensing condition, and meanwhile the environmental adaptability and the calculation efficiency of the classification process are guaranteed.

The invention discloses a bolt pretightening force monitoring and early warning method, system and device applied to a hydroelectric generating set and a medium, and relates to the technical field of power equipment monitoring and early warning. Signal information which is generated by the passive sensing assembly in the bolt service process and reflects the stress state is collected; the receiving device carries out data reverse acquisition on energy excitation emitted by the passive sensing assembly through radio frequency energy coupling, and the sensing assembly sends signal information to the receiving device located in a bolt adjacent region in a wireless mode; edge-level preprocessing and cloud-level trend analysis are carried out on the received signal information, a self-learning threshold model based on historical data is established, and the bolt pre-tightening state is analyzed. According to the method, the passive sensing assembly is embedded, a state driving type sampling mechanism is introduced, a data processing framework with edge and cloud collaboration is constructed, and dynamic sensing and intelligent early warning of the bolt pretightening force of the hydroelectric generating set in the whole operation process are achieved.

The invention discloses a mechanical arm wireless energy transmission method and system with a direction neutralization strategy, and relates to the technical field of wireless energy transmission. Receiving a magnetic field signal through a passive sensing module, extracting three-dimensional coordinates, directions and energy states of nodes in combination with node feedback, and constructing a three-dimensional space layout diagram; the low-power-consumption intelligent control module judges an energy supply scene and calculates an optimal alignment attitude of a coil in a single-source scene, and a multi-source scene divides an energy supply area through clustering, calculates a geometric center, finely adjusts the direction according to node energy and power weight, and screens an unshielded suboptimal path according to an obstacle avoidance scene; the control module sends an instruction to the mechanical arm servo system and the coil driving module, and a coil is adjusted to a target posture and structure; and comparing the data with the optimal value, preferentially storing energy for the low-electric-quantity nodes, and timely correcting the attitude for the nodes with sufficient energy. According to the method, through passive sensing, a direction neutralization strategy and dynamic correction, the transmission efficiency and the energy supply reliability are improved, and the multi-scene wireless energy transmission requirement is met.

Various embodiments disclose passive directional multi-gigabit (DMG) sensing for object detection with millimeter Wi-Fi beacon frames. The DMG sensing comprises collecting a schedule of the multidirectional mmWave Wi-Fi beacon transmissions including times and directional sector of each mmWave packet in the directional beam training. Further, values of an occupancy map of an environment are evaluated statistically using a model connecting the schedule of the beacon transmissions with intra-packet measurements and inter-packet measurements of reflections of the multidirectional mmWave Wi-Fi beacon transmissions. These values of the occupancy map are then used to determine parameters of an object in the environment.

The invention provides a low-altitude aircraft-oriented air safety conflict early warning method and system, and the method comprises the steps: respectively detecting the signals of all low-altitude aircrafts in a region based on an active detection network and a passive sensing network, and obtaining first detection information and second detection information; performing matching verification on the first detection information of the same low-altitude aircraft based on the second detection information of the same low-altitude aircraft to obtain detection information after matching verification, and calculating position change tracks of any two low-altitude aircrafts within a preset time interval based on the detection information after matching verification of each low-altitude aircraft; performing intersection point judgment based on the position change trajectory to obtain a trajectory intersection point judgment result between any two low-altitude aircrafts; if the track intersection point exists in the track intersection point judgment result, sending out a leading air safety conflict early warning signal; and if the track intersection does not exist in the track intersection judgment result, not sending out the leading air safety conflict early warning signal. According to the invention, the reliability and comprehensiveness of low-altitude leader safety management are improved.

The invention provides a trapped person position state analysis method and system, and relates to the field of data processing. According to the method, building structure distribution, conductive fluid flow channels and metal component distribution in a disaster target area are constructed to form a background entropy flow ground state, and noise intensity probability distribution, a channel joint fluctuation relation and a time stability index are counted to generate a background entropy flow field. In the search and rescue stage, a background entropy flow field is converted into a controlled mode through active disturbance, multi-physical channel noise responses before and after disturbance are collected through a multi-field passive sensor network, and a multi-dimensional local entropy response vector is constructed. And combining the consistency, directivity and duration of the multi-noise channel to identify an initial suspected region and extract an entropy anomaly core region, finally inferring metabolic activity and posture limitation conditions according to a local entropy response cooperative relationship in different disturbance modes, and outputting a position state result of the trapped person. By implementing the technical scheme provided by the invention, the position state of the trapped person can be accurately identified.

The invention relates to the technical field of agricultural information and intelligent sensors, and discloses a farmland soil moisture content real-time monitoring method based on multi-sensor fusion. The method comprises the steps that passive sensing nodes integrating water content, temperature, conductivity and water potential sensors are arranged, soil micro-vibration is converted into electric energy through a piezoelectric energy collection module and stored in a super capacitor, and low-power-consumption wide-area synchronous communication is achieved through the narrowband Internet of Things; and the cloud carries out time alignment, abnormity elimination and fusion processing on the multi-source data to generate a soil moisture status field, and outputs an irrigation decision in combination with a crop growth model. According to the invention, high-precision, self-powered and maintenance-free soil moisture content in-situ monitoring and intelligent irrigation closed-loop control are realized.

Apparatuses, systems and methods of providing a smart container. The smart container contains a consumable, and includes: a container body; a label affixed to the container body; and a passive sensing tag (PST) embedded in the label. The PST includes: a backscatter antenna; a radio-frequency identification (RFID) communicative with the backscatter antenna; and at least one sensor communicative with the backscatter antenna. Responsive to a ringing from a radio frequency transceiver, the backscatter antenna provides the RFID and data from the at least one sensor. The RFID and the data are then processed to provide usage information of the consumable to a user via a dashboard available at least on a smartphone and on a desktop.

The invention relates to a passive driving microcapsule movement color development method, and belongs to the field of sensor detection. According to the method, sweat generated during movement of a human body drives a photovoltaic device to spontaneously generate electric potential, the electric potential directly acts on microcapsule dispersion liquid to drive directional movement of black and white particles in the microcapsule dispersion liquid, and visual color development response without an external power source is achieved. The method mainly comprises the steps of sweat induced power generation, particle electrophoresis driving and ion concentration associated color development. The problems that an existing sweat detection technology depends on an external power source, the equipment size is large, and real-time visual reading cannot be achieved are solved, and the device is mainly applied to the fields of real-time sweat electrolyte analysis in exercise physiological monitoring, autonomous color development change of wearable medical equipment, passive sensing display integrated systems based on ion concentration gradient and the like.

The application discloses a kind of laser warning device passive sensing space non-cooperative target state calculation methods, first establish the relative motion state model of our satellite and enemy satellite and laser warning device observation model, then obtain observation angle information, according to the initial relative state quantity and initial relative state quantity error estimation value of our spacecraft and enemy satellite according to observation angle information, according to the relative state information between our satellite and enemy satellite is obtained according to the relative motion state model of our satellite and enemy satellite, laser warning device observation model and initial relative state estimation value and its error estimation value, again the relative state information between our satellite and enemy satellite is filtered and estimated, finally the estimation value of target satellite motion information is obtained, the position and velocity information of enemy satellite can be high-precision estimation.

The present application relates to the technical field of wireless passive sensing, and discloses a differential sensing system for metal crack detection and a quantitative detection method thereof, which comprises an RFID reader-writer and a passive RFID differential sensing tag; the passive RFID differential sensing tag comprises a communication antenna, an RFID chip, an impedance matching network, a planar inductive sensing module, a radio frequency switching module, an energy recovery module and a data processing unit; the impedance matching network is connected between the communication antenna and the RFID chip; the planar inductive sensing module comprises a reference planar inductor and a sensing planar inductor; after double-state alternate sampling of the reference sensing, difference is performed, so that environmental disturbances such as reading and writing distance, sensor posture, multipath and temperature drift are significantly suppressed, and differential noise suppression is realized; the switching module is powered by the energy collection antenna, voltage doubling rectification and charge management module in the energy collection management module, battery maintenance is avoided, and passive operation is realized.

The invention provides a target reconstruction method and system based on passive sensing radar echo signals, and the method comprises the steps: obtaining a passive sensing radar echo signal set of a target scene, the passive sensing radar echo signal set comprising a plurality of echo signal sequences; performing signal preprocessing operation on the passive sensing radar echo signal set to obtain a preprocessed radar echo signal set; multi-level feature extraction operation is executed on the preprocessed radar echo signal set, a multi-dimensional state feature set of the target object is generated, and the multi-dimensional state feature set comprises scattering characteristic features, motion correlation features and environment interference suppression features; and calling a pre-trained target state analysis model to carry out state transition modeling processing on the multi-dimensional state feature set, generating a reconstructed state vector of the target object, and carrying out reverse mapping based on the reconstructed state vector to obtain a geometric parameter set and a motion parameter set of the target object.

The invention discloses a variable reluctance type proximity sensor with high reliability. The variable reluctance type proximity sensor comprises a target; the induction unit comprises a shell and an induction assembly, the induction assembly comprises a magnetic core, an excitation coil and a printed board, the excitation coil is wound on the framework through an enameled wire and arranged on the magnetic core, the excitation coil and the magnetic core are integrally inserted into the bushing ring, and the excitation coil is led out of the shell after being connected with the printed board. The whole induction assembly is encapsulated in the shell through sealant. The excitation coil generates an alternating magnetic field under the action of an excitation signal, and when the target is close to the induction surface of the induction unit, the magnetic resistance in the magnetic field is changed, so that the self inductance of the excitation coil is changed; the excitation coil is connected with the detection circuit, and inductance value changes of the excitation coil are obtained through the detection circuit and converted into electric signals capable of representing the approaching state of the target to be output. An integrated packaging structure is adopted, components and passive sensing assemblies are not arranged inside, good reliability is achieved, approaching / departing position detection can be achieved by installing the target on a detected object, and the target can be suitable for various complex and long-distance position detection.

The invention provides an animal health digital supervision method and system based on big data, and relates to the technical field of digital supervision, and the method comprises the steps: collecting animal health full-chain data, and customizing a passive sensing tag of an RFID chip; the fingerprint ear tag information is preprocessed, supervision partitions are divided, and processed data are collected to the corresponding partitions; calculating a comprehensive risk value of each partition and risk traceability information associated with the fingerprint ear tag; according to the comprehensive risk value, the risk hazard degree and the inter-partition interference coefficient, the depth risk value of each partition is calculated; and synchronizing the original data containing the comprehensive risk value and the depth risk value to the block chain mini node, carrying out hash encryption, binding the encrypted data with the tag physical fingerprint to generate a tamper-resistant evidence storage record, and caching off-line data. According to the invention, big data, the Internet of Things, the block chain technology and animal health supervision business are deeply fused, and standardized and precise management of supervision data is realized.

The invention provides a traffic flow density monitoring system and method based on passive resonant cavity modulation, and belongs to the technical field of traffic monitoring, the traffic flow density monitoring system comprises a portal frame fixedly installed on a road, a passive sensing unit connected to the portal frame and a base station; the passive sensing unit comprises a resonant cavity and a cantilever beam used for connecting the resonant cavity with the portal frame; the base station comprises a radio frequency module and a signal processing unit, and the radio frequency module is used for transmitting a radio frequency inquiry signal with a specific frequency to the passive sensing unit and receiving a radio frequency signal reflected by the passive sensing unit; and the signal processing unit is used for processing and analyzing the received reflected radio frequency signal, identifying a vehicle passing event by detecting the change of the resonant frequency, and calculating the traffic flow density based on event statistics. According to the invention, accurate, low-power-consumption and low-cost traffic vehicle density monitoring is realized.

The present invention discloses a broken wire test and on-line monitoring system and method for a lightning protection wire of a wind turbine blade, including a blade and a lightning protection wire arranged inside the blade, and the lightning protection wire is arranged from the tip of the blade to the root of the blade; it is characterized in that a passive sensing system is arranged at the tip of the blade, and a high-frequency electromagnetic pulse device is arranged at the root, and the high-frequency electromagnetic pulse device includes a high-frequency sensor; a unit edge terminal device is arranged at the hub; the high-frequency electromagnetic pulse device loads a high-frequency electromagnetic pulse signal onto the lightning protection wire, and after receiving the electromagnetic pulse through the passive sensing system, a carrier high-frequency pulse with a coding feature is sent out by a passive control chip, and is reversely coupled to the tip of the lightning protection wire through the sensor and propagates along the lightning protection wire to the root, and the carrier pulse signal is collected by the high-frequency sensor at the root, and if the coding of the complete carrier high-frequency signal can be received, it is determined that the lightning protection wire is not broken; through this set of system and method, the lightning protection system of the wind turbine blade can be monitored in real time, with high efficiency, and the detection can be carried out without shutting down the machine, reducing the economic loss caused by the detection.

Systems and techniques are provided for sensing and device tracking. For example, a process can include obtaining first sensor data from a plurality of sensors configured with a first sensor operation mode and included in a tracker device of a plurality of tracker devices. Neighbor context information can be determined for the tracker device based on passive sensing data included in the first sensor data, and can be indicative of a placement of the tracker device relative to one or more additional tracker devices included in the plurality of tracker devices. An updated sensor operation mode can be determined for the tracker device in response to one or more changes in the neighbor context information, the updated sensor operation mode different from the first sensor operation mode. Second sensor data can be obtained from the plurality of sensors based on configuring the tracker device with the updated sensor operation mode.

According to one aspect of the present disclosure, there is provided a computer-implemented method of determining a configuration of a projectile launching device, the method includes receiving first data from a passive sensor; determining a first location of a detected object based on the first data; determining a second location based on the first location; and determining a configuration of the projectile launching device to propel a projectile to collide with the detected object in the second location.

The invention discloses a pressure sore prevention activity monitoring system which comprises a body position monitoring patch, a radio frequency transceiver and a monitoring terminal. The body position monitoring patch comprises a pressure sore prevention patch, a passive sensing chip embedded in the pressure sore prevention patch, a radio frequency antenna and a height position detection sensor; the radio frequency transceiver is in radio frequency connection with the passive sensing chip through the radio frequency antenna, and the radio frequency transceiver is in wireless connection with the monitoring terminal; the two pressure sore preventing patches are correspondingly attached to the left and right sides of the human skin; and when the relative height position change difference values of the two height position detection sensors within a preset time range are both smaller than an alarm preset value, the monitoring terminal outputs an alarm. The body position monitoring paste is not provided with a battery or an external power supply, so that the whole body is small, exquisite, light and thin, the body position monitoring paste is attached to the skin of a user, and the user does not feel foreign body sensation easily, so that the body position monitoring paste is safe and comfortable to use, two body position monitoring paste bodies are adopted for cooperative monitoring, the turning-over monitoring accuracy can be greatly improved, and the turning-over state can be remotely monitored; therefore, informatization linkage can be realized.

The present application relates to the technical field of anti-interference navigation signal deception, in particular to an anti-interference navigation signal deception waveform design optimization method and system; the system extracts space-time features by listening to the internal communication signals of the target network; the core is to use the extended Kalman filter to iteratively solve the network topology state in reverse, and combine the virtual constellation parameters to construct a systematic deception quality index; the optimal deception waveform is determined by optimizing the parameters to maximize the index; the system also corrects the topology state and strategy weight based on the deception effect error closed loop; the present application realizes the transition from open-loop blind deception to dynamic passive sensing, and solves the problem of being unable to perceive the target topology.

The invention provides an ultrasonic sensor and a preparation method thereof, an underwater ultrasonic detection system and an application method, a single-mode fiber-multimode fiber-grapefruit type photonic crystal fiber cascade structure is adopted, a PDMS elastomer is locally filled in a photonic crystal fiber, a built-in solid-gas Fabry-Perot interference cavity is formed, an external vibrating membrane is not needed, and the ultrasonic sensor is simple in structure and convenient to operate. Therefore, the structure is simplified, and the manufacturing cost is reduced. By optimizing welding parameters and a PDMS filling and curing process, stable and efficient preparation of the sensor is realized. The design enables the sensor to have high sensitivity and broadband ultrasonic response capability, and PDMS built-in packaging improves environmental durability and measurement stability. The all-fiber passive sensing mode has the advantages of electromagnetic interference resistance, miniaturization and narrow space measurement adaptation, the system is easy and convenient to build, and the system is suitable for ultrasonic detection under complex environments such as underwater and high-temperature environments.

The present invention provides a passive sensing system, which relates to the field of RFID. In the present invention, a passive sensing tag is installed on a substance to be detected. When the tag receives a polling signal from a signal processing device, based on the characteristic that the impedance of its own sensing antenna changes with the environment, the tag feeds back an echo signal to the signal processing device, the amplitude and phase of which change with the impedance of the sensing antenna and include the tag identity data. Thus, the signal processing device can send the currently fed-back echo signal of the same passive sensing tag and its pre-stored echo signal in the daily environment to a main control device. The main control device displays the currently corresponding echo signal and the pre-stored echo signal of the same passive sensing tag, enabling the user to know the identity data of the corresponding tag and the environmental change situation around it by comparing signals on the main control device side, and reducing the implementation cost of sensing communication.

Aspects of the disclosure relate to systems and methods for receiving, by a first user equipment (UE), a message comprising at least one of: reference signal information (RS-info) relating to one or more reference signals (RSs) corresponding to line-of-sight (LoS) signals targeting a receiver other than the first UE, and / or data-decoding information relating to data scheduled for purposes of on-going communication with a second UE, and not scheduled for purposes of on-going communication with the first UE. The disclosure also relates to systems and methods for monitoring for at least one of: encoded signals based on the data-decoding information, and / or for one or more RSs based on the RS-info. Other aspects, embodiments, and features are also claimed and described.

The invention discloses a hydropower station underground powerhouse personnel positioning system, method and device. The system comprises a personnel positioning terminal module, a passive sensing fusion module, a multimode sensing network module, a data transmission module, a data processing and monitoring center module and an early warning linkage module which are interconnected through an industrial protocol. The passive sensing fusion module comprises an entrance guard fingerprint machine unit, an entrance and exit face recognition gate unit, an important area face recognition camera unit and a passive data integration unit; the data processing and monitoring center module comprises a dual-mode positioning algorithm engine, corresponding weights are given to active data and passive data, and positioning results are fused through weighted average; and the early warning linkage module binds the personnel information with the dangerous area authority, triggers early warning according to the setting, and links the access control locking method, device and system to be matched and corresponding. The method has the advantages that the requirements of the pumped storage power station can be met, and the operation and maintenance cost is relatively low.

The invention provides a frequency modulation broadcast signal monitoring system, which comprises a modulation domain anomaly detection module, a modulation distortion identification unit based on deep learning, an FM signal modulation index deviation analysis module, an output anomaly type and a confidence coefficient in real time; the distributed sensing network is a three-layer monitoring node composed of a miniature repeater in a tunnel, a vehicle-mounted mobile monitoring terminal and a fixed base station, and networking is carried out through a LoRaWAN protocol; the multi-source data fusion engine is used for correlation analysis of modulation domain data, spatial position data and environmental electromagnetic data; through three innovations of modulation domain depth analysis, distributed passive sensing and multi-source data collaboration, the bottleneck of a traditional monitoring technology is thoroughly broken through, global real-time guarantee is provided for broadcast signal safety, modulation domain analysis is improved, the modulation distortion recognition accuracy is improved, faults are early warned in advance, a distributed network eliminates monitoring blind spots of shielding areas such as tunnels, and the safety of broadcast signals is improved. The emergency response time is shortened, the interference source three-dimensional positioning is realized through multi-source data fusion, the positioning error is small, and the troubleshooting efficiency is improved.

The invention provides a surrounding rock shallow damage dynamic monitoring system based on active and passive fusion sensing, which belongs to the technical field of underground engineering surrounding rock safety monitoring, and comprises a prefabricated sensing unit, a signal acquisition and processing unit and a data analysis and inversion unit, the signal acquisition and processing unit comprises a signal transmitting system and a signal receiving system; and the data analysis and inversion unit processes the dynamic strain signal and the micro-vibration signal. Active elastic wave monitoring and passive micro-seismic monitoring are fused, the limitation that a traditional method is single in function is overcome, the health condition of the rock mass can be evaluated regularly, and the dynamic fracture activity of the rock mass can be monitored in real time. The invention further relates to a monitoring method of the surrounding rock shallow damage dynamic monitoring system based on active and passive fusion sensing.

The present invention discloses an integrated displacement and velocity sensor with a novel and reasonable structure. The linear displacement measurement portion is based on the LVDT sensor principle. The linear displacement measurement portion and the velocity passive sensing portion are rigidly connected to ensure synchronous motion. Based on this design, the displacement and velocity of the object being measured can be directly observed simultaneously. It is mainly suitable for applications with high demands on linear servo control and can fundamentally eliminate the fluctuation problems and velocity phase lag problems caused by differential velocity calculation. Displacement is measured using the LVDT principle, and velocity is measured using the passive sensing principle. The sensor adopts a series structure as a whole, using a radially magnetized annular permanent magnet and a magnetic rod to form the velocity measurement rod. It does not require an external excitation signal and can effectively constrain the main magnetic flux, thereby reducing leakage magnetic flux and its interference with the velocity gain parameter, thereby increasing the measurement accuracy of the sensor.

Systems and methods are provided for determining the tilt-state of a moveable surface using a batteryless mechanism. A tilt-sensing device may be coupled to a moveable surface, such that the tilt-sensing device changes orientation in a manner corresponding the orientation of the moveable surface. The tilt-sensing device may include an antenna and a moveable component. The moveable component may change locations as the tilt-sensing device changes orientation due to gravitational forces. When the tilt-sensing device is in a substantially horizontal orientation, the moveable component may cause a distribution of material on the antenna. The distribution of material may detune the antenna by applying a load. Signals transmitted by the antenna may be shifted with respect to an expected frequency range. An external computing device may determine the tilt-state of the tilt-sensing device based on the presence or absence of a shift within received signals from the tilt-sensing device.

This specification discloses a method and system for constructing, dynamically updating, and mining a global generic relationship passive sensing graph. The method deploys passive sensing nodes across the entire domain to silently collect generic relationship data of entities of all scales and types, performs preliminary anonymization, and constructs a unified global generic relationship graph after local encryption preprocessing. A dual-mode dynamic update mechanism is used to maintain the graph's validity, and a multi-dimensional anomaly mining algorithm is employed to identify abnormal associations. Data security control and differentiated handling are implemented throughout the process. This solution addresses the problems of incomplete relationship coverage, delayed updates, and insufficient data security in existing technologies, achieving accurate collection, anonymized identification, and security control of generic relationships.