52results about How to "Prevent false alarms" patented technology

The invention discloses a frame synchronization method applicable to a burst communication system. A multi-path segmented coherence relevance mode with different segmentation lengths is adopted in an initial signal channel access stage, the maximum relevance value of each branch path is adopted for carrying out double-threshold value (relative threshold value and absolute value) judgment, the synchronous confirmation is carried out from the position with the relevance value exceeding the threshold value, and the influence of severe environment factors in the initial signal channel access stage is overcome through the setting of proper double threshold values and conforming windows; and a full coherence relevance mode is adopted in a stable communication stage, the prior double threshold values and conforming window width are set according to the signal channel information recorded in the conforming windows in the initial signal channel access stage, and the method and the device have higher adaptability through different frame synchronization methods adopted in different communication stages.

A system comprising an antenna module and a processor sub-module. The antenna module is configured to connect and send data to a network through a wireless connection. The network is configured to (A) connect to web services in a first mode and (B) integrate with user devices in a second mode. The processor sub-module is configured to provide a physical connection to (i) the antenna module, (ii) a plurality of output devices, and (iii) a plurality of sensors. The plurality of output devices are configured to implement a virtual receptionist. The plurality of sensors send data to the network.

The invention provides a system and a method for detecting leakage of a high-temperature gas in a high-temperature high-pressure guide pipe of an airplane, and belongs to the field of high-temperature high-pressure gas leakage detection. The method is characterized by comprising the following processes that: (1) when the high-temperature gas is leaked from the guide pipe, the ambient temperature around the guide pipe is raised quickly; and due to the heating action of the gas, the resistance value of a thermistor is changed rapidly along the raising of the temperature so as to judge whether the gas is leaked; and (2) according to the theory, the variations of the resistance values of the ends AB, AD, CB, CD, AC and BD are detected at the same time; and if the resistance values of three or more paths are different from the rated values, the gas in the area is leaked. Compared with other detection systems, the system has the advantages of simple structure, high reliability and the like, and can synchronously realize leakage judgment and position location of the high-temperature gas guide pipe of the air plane of other high-temperature gas pipelines. The leakage detection system has great significance for guaranteeing the flying safety and improving the running dispatch rate of the air plane.

Embodiments provide a method and apparatus for indicating aircraft height relative to an obstruction in a terrain awareness warning system. The method includes receiving data indicative of geographicfeatures of an obstruction, lateral distance of the geographic features from an aircraft, height and flight path of the aircraft, calculating a projected height of the aircraft at the location of theobstruction using the data, generating a result signal, and displaying a colored indication on a display screen based on the result signal. The apparatus includes inputs for signals from instruments measuring height, flight path, and location of an aircraft, as well as an input for an instrument providing information about geographic features of terrain surrounding the aircraft.

The invention relates to the technical field of hybrid electric vehicles, in particular to a power distribution system and method of a hybrid electric vehicle. The system comprises a controller, an isolating switch, a power distribution control module, a high-voltage power source power distribution module connected with a first wiring contact of the isolating switch, and a low-voltage power sourceconnected with a second wiring contact of the isolating switch, wherein the isolating switch and the power distribution control module are connected with the controller. The high-voltage power sourcepower distribution module is used for being connected with a starter of the hybrid electric vehicle through the isolating switch so as to supply power to the starter. The low-voltage power source isused for supplying power to the starter connected with the low-voltage power source in series. The power distribution control module is used for obtaining working condition information of the hybrid electric vehicle and controlling the isolating switch to be turned on and off on the basis of the working condition information. Through reasonable power distribution, it is guaranteed that the voltageof the whole vehicle is stable, the fault of a blank screen of an instrument or the stall of an engine due to the insufficient power or the start voltage drop is prevented, and the operation stability of the hybrid electric vehicle can be improved.

The invention relates to a high voltage earth protective device of an electric power system, in particular to a high voltage network single phase earth classification and integral route selection device. The device comprises a main transformer substation and branch transformer substations, communication devices connected with each other are arranged equally between route selection devices of the main transformer substation and each branch transformer substation, the route selection devices in each branch transformer substation is used cooperatively with the route selection device in the main transformer substation through communication devices; and the route selection devices in the main transformer substation and each branch transformer substation comprise a signal collection board, a signal converter, a main board, a display and a power panel. The route selection device can effectively distinguish the earth fault of each branch transformer substation from the earth fault of the main transformer substation, prevent false alarm from occurring in branch transformer substations, accurately select single phase earth fault, greatly improve processing efficiency of earth fault, reduce work intensity of power supply and maintenance personnel, improve operating rate of power supply system, and ensure safe operation of the power supply system.

A voice recognition based stolen motor vehicle active alarm and tracking system comprises a voice module, an alarm module and a wireless communication module. The voice module comprises a voice recognition module, a voice synthesis module, a recording module, a loudspeaking module and a control module. By means of the system and a method, vehicle thieves with special voice processing skills can be prevented from imitating vehicle owner voice by stealing vehicle owner vocal print information, and false alarm caused by preset answer forgetting of legal vehicle owners can be effectively prevented; meanwhile, position information of stolen vehicles can be monitored in real time, and thieves can be arrested timely to find vehicles.

The invention discloses an elevator landing door lock contact state detecting device and method. The elevator landing door lock contact state detecting device comprises a controller, a sensor and a voltage measuring device, wherein the sensor and the voltage measuring device are connected with the controller. Neither does elevator state information need to be obtained from an elevator control system, nor the elevator control system need to be intervened. The states of elevator door lock contacts and the state of a landing door are comprehensively and accurately known through detecting signals of the sensor and the elevator measuring device, so that misjudgment or false alarm is effectively prevented.

The invention discloses a watchdog starting method of an interference preventing system. The method comprises the following steps: 1) judging whether a watchdog mechanism is closed according to external conditions; if the watchdog mechanism is closed, resetting watchdog counting, wherein the watchdog resetting is invalid if the watchdog interrupted is invalid; if the watchdog mechanism is not closed, carrying out a step 2); 2) judging whether the watchdog counting reaches a timing threshold of the watchdog; if the watchdog counting does not reach the timing threshold, increasing 1 to the rising edge of each clock by the counter; if the watchdog counting reaches the timing threshold, interrupting the watchdog, resetting the watchdog counting, and increasing 1 to the interrupted counting of the watchdog; 3) judging whether the interruption times of the watchdog reaches 3 times; if the interruption times of the watchdog reaches 3 times, generating a watchdog resetting signal to reset a whole system; if the interruption times of the watchdog does not reach 3 times, continuing implementing this step until the watchdog resetting signal is generated; 4) outputting the watchdog resetting signal. According to the watchdog starting method provided by the invention, the requirements that the normal operation of the processor can be ensured by an embedded system can be met, and software runway or the endless loop can be prevented by aiming at the embedded system.

An installation for the detection of projecting material defects in a paper web or corrugated cardboard web moved in a feed direction. The device comprises a sensor device comprising a first sensor unit with a first emitter for emitting first sensor beams and a second emitter for emitting second sensor beams and with a second receiver, wherein the first sensor beams run parallel to the material surface to be monitored of the paper web or corrugated cardboard web and travel along a first signal path S1 in-between. The sensor device further has a second sensor unit comprising a second emitter for emitting second sensor beams and a second receiver, wherein the second sensor beams run parallel to the material surface and travel along a second signal path S2 in-between. The first and second sensor units are oriented in such a way that the distance between the first and second sensor beams relative to the feed direction changes along their signal paths S1, S2.

A method for image processing involves collecting image data of a scene as electromagnetic radiation and processing the image data to improve the signal-to-noise ratio of the image data. The image processing involves dividing a raw image that contains the image data into lines and columns, to create a raster image, superimposing a central raster filter element of a raster filter having an odd number of lines and an odd number of columns onto a raster image element, determining the brightness values of each of the raster image elements covered by the raster filter, wherein except for the central raster filter element, every other raster filter element has an individual light-reducing property, and adding up the brightness values to produce a total brightness value, and assigning this total brightness value to the raster image element covered by the central raster filter element. These image processing steps are repeated for all remaining raster image elements to produce a result image having the same resolution as the raw image from the total brightness values of the raster image elements.

The invention discloses an iron tower attitude early warning device based on Beidou positioning multi-point calculation. The device comprises an iron tower, a camera, a reflector, an antenna I, an antenna II, an antenna III and an antenna IV. The antenna I, the antenna II, the antenna III and the antenna IV are respectively arranged in four directions of the top of the iron tower, the camera is arranged at the bottom of the iron tower, the reflector is arranged in the lens direction of the camera, a laser emitter is arranged at the vertical position above the reflector and installed on the upper portion of the iron tower, the position relation among the camera, the reflector and the laser emitter meets the requirement that laser beams emitted by the laser emitter are captured by the cameraafter passing through the reflector, and an early warning system is arranged in the iron tower. The device has the advantages that: 1, the Beidou differential positioning technology is used, and theposture and settlement of the iron tower are measured in a high-precision mode; and 2, the four antennas are matched for use, so that multi-position fusion calculation of the iron tower is realized, exponential filtering is performed, data jitter is eliminated, and the accuracy of establishing an iron tower deformation module is improved.

The invention relates to the technical field of dangerous rock mass monitoring and early warning, in particular to a dangerous rock mass acousto-optic combined intelligent monitoring and early warning method. The method comprises the steps of S1, selecting an object, specifically, selecting a dangerous rock mass below which a threatened object exists; S2, installing instruments, specifically, installing an alarm instrument on a stable mountain body on the inner side or the side of the dangerous rock mass, wherein the alarm instrument comprises a control module, and installing a monitoring instrument on the dangerous rock mass or between the dangerous rock mass and the mountain body; and S3, performing initial data acquisition, specifically, acquiring data of the size, shape, height, inclination direction, inclination angle, displacement, crack width, landform conditions of the dangerous rock mass and distribution of threatened object through two modes, namely, the monitoring instrument and manual observation, and inputting the manually acquired data into the monitoring instrument. According to the technical scheme, the dangerous rock mass is monitored in real time, meanwhile, when the dangerous rock mass collapses, a sound-light alarm signal is sent out at the first time, a safe escape path is pointed out to threatened people, and the personal safety of the people is ensured.

The invention discloses a remote intelligent monitoring method and equipment for transformer substation alternating current and direct current system faults. The equipment includes a module information acquisition unit, a remote monitor, a cloud server and a control terminal. The module information acquisition unit includes a charging module monitoring unit and a relay therein, the relay in the charging module monitoring unit is connected with the output end of a charging module and detects voltage and current information of the output end, the charging module monitoring unit is connected withthe remote monitor through a serial communication isolator in a multi-dry contact input mode, the remote monitor includes a processor, a protocol switching box and an antenna which are connected in sequence and is connected with the cloud server and a mobile phone in a wireless communication mode, and the cloud server is connected with the control terminal formed by a PC and a mobile phone APP; and running data of a transformer substation alternating current and direct current power supply are remotely monitored, so that operation and maintenance personnel comprehensively master the running condition of the transformer substation, thereby improving the stability of safe operation of the system.

The invention discloses a self-adjusting sand intrusion-prevention radar detecting trolley. The structure of the self-adjusting sand intrusion-prevention radar detecting trolley comprises wheels, a main body, a balancer, a radar detection lower connector, and a sand-proof processing device. With the self-adjusting sand intrusion-prevention radar detecting trolley of the invention adopted, after sand enters joint gaps, the temperature of the interior of the trolley rises, a heat conduction bag and a memory alloy sheet expand thermally and deform after the temperature rises, so that a squeezingplate is pushed upward to squeeze out water from water absorption sponge; the sand is discharged to the lower part of the device; and due to the infiltration capacity of the water, the sand is completely wrapped by the water, so that the specific heat capacity of the sand is increased, and the temperature of the sand will not rise too fast. In the high-temperature environment of a desert, water inside the trolley is evaporated; a leak-proof condensing device inside the trolley automatically collects water vapor; the sand enables a thermal actuator to act in the temperature rise process, so that a sand collecting plate and a fixing plate are pushed open, and the sand inside is discharged; and therefore, too fast temperature rise inside the trolley due to the accumulation of too much sand can be avoided, and the false alarms of laser radar detection can be prevented.

The invention discloses a 75MVA transformer with a mixed explosion-proof function. The 75MVA transformer comprises a fire extinguishment mechanism, a pressure release mechanism, a leakage detecting mechanism and a control mechanism which are connected onto the transformer, wherein a system of the 75MVA transformer comprises a control unit as well as a purification unit, a leakage detecting unit, a fire extinguishment unit, a pressure release unit and a transformer unit which are subjected to unified regulation by the control unit. The 75MVA transformer has the benefits as follows: the transformer explosion can be effectively prevented, personal and property safety is protected, and the structure can monitor each part on a winding and can perform early warning and complete explosion-proof actions in time when a short circuit happens. The short-circuit part can be focused to cool, meanwhile, fire-extinguishing gas is uniformly sprayed at the top of the transformer, the explosion-proof means is enhanced, pressure of the transformer can be released in time, and transformer oil waste can be avoided. Each sensor is made of a special material and has higher sensitivity, and false operation or false alarm of the device can be effectively prevented.

A high-sensitivity ground wire voltage protection device comprises three poles of phase line L, neutral line N and earth wire E which are all provided with a switch, a zero-sequence current transformer passing through the phase line L and the neutral line N, a testing circuit, a first amplifying circuit, a tripper, a rectifier circuit, a power supply voltage reducer and a thyristor, as well as a transformer and a second amplifying circuit, wherein one end of the primary coil of the transformer is connected with the earth wire, while the other end of the same is connected with the neutral line N after being connected in series with a large-resistance current-limiting step-down circuit; the primary coil of the transformer is connected with the input end of the second amplifying circuit; the working power supply of the second amplifying circuit and that of the first amplifying circuit both are connected with the power supply voltage reducer; the output end of the second amplifier circuit is connected in series with a reverse voltage isolating circuit and then is connected with the trigger electrode of the thyristor; and the output end of the first amplifier circuit is also connected in series with a reverse voltage isolating circuit and then is connected with the trigger electrode of the thyristor. The high-sensitivity ground wire voltage protection device is capable of guaranteeing that the live trip voltage of the earth wire is not greater than the safe voltage and preventing malfunction and false alarm.

The invention provides a water level monitoring device, an air conditioner and a water level monitoring method of the air conditioner. The water level monitoring device comprises a water pan, a first monitoring electrode and a second monitoring electrode; the first monitoring electrode and the second monitoring electrode are arranged in the water pan in a suspended mode; a loop electrode is further arranged at the bottom of the water pan; and when the water level rises to the early warning water level, the first monitoring electrode and/or the second monitoring electrode are/is connected with the loop electrode to generate an early warning signal. The problem that specific water level information of condensate water in the water pan cannot be monitored, and consequently early warning of the water level information cannot be effectively achieved is solved.