128 results about "Passive sensing" patented technology

An apparatus carried by an unmanned vehicle to provide passive sensing and facilitate avoiding airborne aerial obstacles is provided. The apparatus can include at least one, but typically multiple optical systems installed, for example, in the nose of the aerial vehicle to passively sense and determine a range, direction, and velocity of the airborne obstacles to allow the aerial vehicle to avoid the airborne obstacles. The typical optical system includes at least one focal plane array or other imaging device configured to receive a wide field of view and at least one focal plane array or other imaging device configured to receive a steerable narrow field of view within the wide field of view to allow concentrated determination of the range, direction, and/or velocity of obstacles detected by the wide field of view imaging devices.

A vehicle detection sensor apparatus including a frame and a dual mode sensor connected to the frame, the dual mode sensor having an active and a passive sensing mode wherein at least one of the active and passive sensing mode is automatically cycled between on and off states when providing a positive reading condition.

A single dual mode monolithic focal plane array having an active sensor and a passive sensing capability is switched from one mode to the other by switching the bias across the cells of the array from a passive IR mode to an active LADAR mode, with the monolithic dual mode focal plane array having applications in missile target seekers and laser target designators. The switching is accomplished by increasing the gain of the array by as much as 30 times that associated with IR detection when laser return pulses are expected. Thus, there need be no mechanical changes to the array to afford both passive IR sensing and an active LADAR pulse detector. Nor need there be two different focal plane arrays, one for IR and one for laser radiation, which leads to boresighted alignment problems.

A passive sensing system for determining a physical position of a mechanical device includes an encoding system configured to convert a position signal representative of the physical position of the mechanical device into an encoded signal in a binary format. The sensing system also comprises a plurality of secondary optical paths coupled to a primary optical path positioned between a light source and the encoding system. The encoded signal comprises a plurality of pulses of light each sequentially delayed by the secondary optical paths. A system for determining a physical position of a flight control surface of an aircraft is also disclosed. A method for determining a physical position of a flight control surface of an aircraft is also disclosed. A passive sensing system for determining a physical position of a flight control surface of an aircraft is also disclosed.

An electric field signature detector for detecting and identifying objects that uses multiple electrostatic sensor nodes each having a passive sensing electrode whose free conduction electrons are displacement responsive to an externally applied or sensed electric field potential, and a transimpedance converter and amplifier exhibiting ultra-high input impedance for translating low level input displacement current from a sensing electrode into a useable output signal in response to a charge displacement signal induced on the passive sensing electrode by an external electric field. The electric field signature detector further includes an exciter for providing a reference electric field used in the retrieval and processing of an electric field signature representative of an object and class of object under investigation. The electric field signature detector having uses including military, security, anti-terrorist, and defense related.

The invention provides a hybrid wavelength-division and time-division multiplexing passive sensing optical network which comprises optical terminal equipment, a passive optical network and an optical sensing unit, wherein a two-way port of the optical terminal equipment is connected to a two-way port of the passive optical network by an optical fiber, and the passive optical network is also connected with the optical sensing unit. The invention mixes a wavelength-division and time-division multiplexing technology and an optical fiber sensing technology and has large multiplexing volume and wide monitoring range.

A method and an apparatus are provided for performing passing sensing using wireless digital communications. The wireless digital communications are frame-based with a predefined frame structure. The method includes receiving a reference signal into to a reference channel, wherein the reference signal comprises a direct version of a radio frequency transmission as part of said wireless digital communications; receiving a surveillance signal into a surveillance channel; detecting and extracting portions of the reference signal corresponding to data transmissions based on said predefined frame structure; extracting portions of the surveillance signal corresponding to the extracted portions of the reference signal; performing a cross-correlation on the extracted portions of the reference signal and the surveillance signal to determine a range-Doppler surface; and providing a real-time display of said range-Doppler surface and/or of information derived therefrom.

An electronic device and an accessory are provided. The electronic device is installed on the accessory and identifies a type of the accessory. The electronic device includes a housing, a processor and an active sensing element. The processor and the active sensing element are disposed in the housing, and the active sensing element is electrically connected to the processor. The accessory includes a body and a passive sensing element, and the passive sensing element is disposed in the body. When the electronic device is installed on the accessory, the processor identifies the type of the accessory through that the active sensing element detects the passive sensing element, and the processor starts an operating mode relative to the accessory according to the type of the accessory. A method of operating an electronic device and an accessory is also provided.

The invention discloses an intelligent agricultural greenhouse monitoring and controlling system based on a wireless passive technology. The system comprises a control terminal, a master control machine room and a plurality of greenhouses, a remote control network is formed by the control terminal and the master control machine room through the internet, an inter-greenhouse ad-hoc network is formed by the master machine room and the greenhouses through a net-shaped ZigBee ad-hoc network, a single-greenhouse central control module, an execution module and a wireless passive ZigBee sensing module are arranged in each greenhouse, and a single-greenhouse sensing control network is formed by the single-greenhouse central control module, the execution module and the wireless passive ZigBee sensing module in the single greenhouse through a star-shaped ZigBee ad-hoc network. The wireless passive sensing modules based on the EnOcean wireless communication standards are adopted by wireless sensing equipment, and a ZigBee wireless networking technology is matched to achieve a passive wireless ad-hoc network so that the problem of energy supply of the greenhouses under the condition of no wire arrangement or little wire arrangement can be solved.

Technologies are generally described for a broadband passive sensing and tracking system that may employ a number of passive receivers that each have the capability of sensing electromagnetic waves (e.g., Radio Frequency "RF" signals) from surrounding broadcast sources. Each passive receiver may be adapted to sense through one or more antennas. Multiple receivers at different positions may be utilized to form a broadband sensing network adapted to perform collaborative tracking of a scene of interest. According to some examples, a beam-forming algorithm may be applied over the broadband sensing network utilizing an antenna array formed by the passive receivers to localize and track objects.

The invention relates to an RFID passive sensing device used for measuring contact temperature of a power switch cabinet. The device includes an RFID passive sensor installed in the vicinity of a switch cabinet contact, and an RFID reader antenna and an RFID temperature reader which are installed at an inner side of a switch cabinet body, and the RFID reader antenna and the RFID temperature reader are connected by adoption of a coaxial cable; RFID passive sensor is internally provided with an RFID passive tag antenna circuit and a temperature measuring RFID circuit; and the RFID temperature reader includes a microprocessor, and a system power module, an external communication module and a wireless transceiving module which are electrically connected with the microprocessor. The RFID passive sensing device used for measuring the contact temperature of the power switch cabinet is reasonable in structure, small in size, high in stability, and convenient to install, does not need to install a battery, has a long reading distance, and satisfies environment requirements of temperature measurement of a switch cabinet.

Systems and methods are described for microwave-frequency, passive sensing of internal body temperature. Some implementations include one or more wearable sensors that wirelessly transmit temperature data continuously to a remote receiver. The sensor can include a probe designed to be placed on a skin site of an individual to receive near-field radiation at the skin site, and a radiometer to detect a total power of the received near-field radiation. The remote receiver includes a signal processing system that can convert the detected total power to an internal tissue temperature measurement by applying the detected power to a tissue stack model. The tissue stack model can characterize the skin site according to a set of weighting functions, each weighting function corresponding at least to electromagnetic characteristics of an associated tissue layer of the tissue stack model.

The invention belongs to the field of indoor positioning and particularly relates an indoor positioning method and system and a server. The method comprises A, an offline training step of collecting training samples and establishing a fingerprint database based on the training samples; B, an online positioning step of receiving RSS data of to-be-positioned terminals, calling the fingerprint database, finishing real-time position operation according to received RSS data, and returning an operation result to the to-be-positioned terminals; and C, an running maintenance step of carrying out active and/or passive sensing on maintenance terminals in a positioning space, continuously collecting fingerprint data of the maintenance terminals, and updating the fingerprint database periodically or aperiodically based on the fingerprint data. The method, the system and the server have the advantage that the stability and accuracy of a positioning process are ensured by continuously updating the fingerprint database.

The invention discloses a double-axis vibrating sensor based on the flexoelectric principle. The double-axis vibrating sensor based on the flexoelectric principle comprises a sensing unit with a high flexoelectric coefficient and four electrodes, wherein the four electrodes adhere to the surface in the length direction of the sensing unit and are not connected, the sensing unit is connected to the side face of a structure to be detected through epoxy glue, the electrodes are electrically connected with a double-circuit charge amplifier, the double-circuit charge amplifier is electrically connected with a signal processing circuit, and the signal processing circuit is electrically connected with a storage and display module; when double-axis vibration happens to the structure to be detected, corresponding flexural deflection is generated by the sensing unit located on one side of the structure to be detected, a strain gradient is generated in the deflection direction of the sensing unit, two groups of corresponding polarization charges are output by the passive sensing unit, and the real-time double-axis vibrating condition of the structure to be detected is obtained by measuring and analyzing the charges in real time. According to the double-axis vibrating sensor based on the flexoelectric principle, no power needs to be supplied to the sensing unit, additional arrangement of a sensitive element is not needed, and the real-time double-axis vibrating condition of the structure to be detected can be obtained simply by directly analyzing and processing output charge signals generated through vibration.

The invention relates to a satellite passive orbit measurement method and system, and relates to satellite technology. The satellite passive orbit measurement method of the present invention is to passively receive the radio signal broadcast by the satellite through the ground station, so as to realize the position measurement and orbit measurement of space objects such as satellites. The specific method is to set up 2 to 4 antennas in each measurement station, and use carrier signal waveform correlation to obtain the range difference D between the two antennas when receiving satellite signals. The rendezvous measurement model obtains the position and orbit of the satellite in space. While completing the above-mentioned rough orbit determination, 10-100 satellite position accuracy monitoring reference stations shall be established within the coverage area of ​​satellite signals. The vector correction number of the satellite position is obtained, so as to achieve the second high-precision orbit determination of the satellite.

The invention relates to a practical household anti-theft alarm, and belongs to the technical field of anti-theft alarming. According to the technical scheme of the invention, the practical household anti-theft alarm comprises a detection launching module for detecting illegal entering and launching an anti-theft triggering signal, wherein the detection launching module is wirelessly connected with a receiving and alarming module; and when the detection launching module launches the anti-theft triggering signal to the receiving and alarming module, the receiving and alarming module carries out oscillation alarm and audible alarm after decoding and judging the anti-theft triggering signal. According to the practical household anti-theft alarm disclosed by the invention, the passive sensing detection is adopted, thus improving the accuracy and prolonging the service life; a chip with address coding and decoding functions is also adopted, thus solving the problem of false alarm of multiple houses; a lithium battery charging and discharging protective circuit is designed, so that the service life of a lithium battery is prolonged, and the use safety is improved; and stable working voltage is supplied for a portable anti-theft receiving circuit by a boost circuit, so that the anti-theft receiving circuit is simple in design, low in cost, timely in alarm and suitable for being used by most houses.

The invention discloses a WIFI signal-based macro traffic flow detection algorithm. According to the algorithm, a detection device system is deployed along a traffic road; the detection device systemincludes a plurality of sub-networks; each sub-network includes one host and a plurality of extension sets; the extension sets (single detection devices) acquire broadcast type data packets through awireless passive sensing mode, screen out data packets carrying mobile terminal device ID information, retrieve the data packets, mark the data packets with extension set labels, and transmit the datapackets marked with the extension set labels to the host, wherein the broadcast type data packets are randomly sent to an ambient environment by mobile terminal devices based on a WIFI protocol; thehost stores collected data in a unified manner, marks the data with time labels, and uploads the data to a data server for storing the data; and macro traffic flow is evaluated and detected through data analysis.