39results about How to "Solve the false alarm problem" patented technology

This invention discloses one in-restorable linear temperature detector and its shortcut alarm method, which comprises linear temperature detect element and its switch case and terminal resistance on both ends of the detection parts, wherein, the linear temperature sensor element is composed of two pieces of detection conductors and NTC isolation layer in between with at least one conductor is easy to be fused wires. This invention provides the method can send different alarm signals according to the shortcut fault or break fire.

The invention discloses a method and circuit for detecting alternating-current fuse failure of an uninterruptible power supply. The method comprises the steps of: detecting voltages at two ends of an alternating-current fuse by using a voltage detection module, when a larger voltage difference exists at two ends of the alternating-current fuse, controlling a switch module to output a low-voltage alternating-current signal, when the voltage difference at two ends of the alternating-current fuse is close to zero, controlling the switch module to output a high-voltage direct-current signal, outputting a signal by the switch module and rectifying, and then controlling the action of a switch tube by a serially-connected voltage-stabilizing tube, and outputting an alternating-current fuse state signal by the switch tube. The corresponding circuit is characterized in that two optical couplers are reversely connected to two ends of the alternating-current fuse in parallel, and secondary sides of the optical couplers are connected in parallel and connected between a positive power supply and ground to be used as the switch module. The invention avoids the problem of false alarm common in the traditional failure detection method. Meanwhile, the invention can be used for detecting the failure of the alternating-current fuse before an inverter carries a load, and avoids that the inverter carries the load under the failure condition.

An operating method of a base station for error handling in fixed resource allocation of the present invention comprises the steps of: a terminal transmitting a first control message including fixed resource allocation information for transmitting an uplink data burst thereto; decoding the uplink data burst in a resource area allocated through the first control message; and determining whether the terminal receives the first control message on the basis of the decoding result.

The invention discloses a dual-frequency synchronous dynamic monitoring short message alarm for broadcast transmitters. The alarm comprises a signal receiving module, a logic processing module, a central processing module, a short message alarm module and a power source module; the logic processing module comprises an audio amplification and delay device, a clock timer and four comparators. With the alarm of the invention adopted, the synchronous monitoring of the working states of a plurality of broadcast transmitters, the initial classification of the operating states and accidents of the transmitters, short message accurate alarm, simple and convenient maintenance can be realized; remote monitoring by engineering technicians can be realized; the dynamic conditions of a machine room canbe mastered at any time; accident handling efficiency can be improved; the safe and high quality broadcasting of broadcast programs can be ensured; and effective technical supervision on the working states of the broadcast transmitters of unattended broadcast transmitting stations can be implemented in particular.

The invention discloses an antitheft and alarm system of a cable. A power supply end alarm module and an electric end alarm module have access to the portions, close to power supply equipment and electric equipment, of a power supply line of the system respectively in a series mode. The power supply end alarm module and the electric end alarm module comprise cable detecting boards. The position of a broken cable (short circuit or open circuit) can be detected through the cable detecting boards. High-voltage impulse waves are sent to the cable through an original point, when the impulse waves encounter a breakpoint or short circuit point, echoes can be generated and are reflected to the original point at the speed approximate to light speed, the original point measures the echoes at high speed and then calculates the time difference between emitting and the echoes, and therefore the length of the broken cable is obtained. Patrol personnel can reach the site in time through a vehicle, or start an alarm near the position of the broken cable after obtaining alarm information, the cable stealing behavior is stopped, the scheme is specifically designed to solve the problem of high-frequency loss of a low-voltage main cable, and high practicality is achieved.

The invention discloses a power supply monitoring method, which detects whether the communication link between the power supply and a monitoring device for monitoring the working status of the power supply is interrupted; if it is not interrupted, it is determined that the power failure alarm of the monitoring device is valid; if interrupted, the Determine that the power failure alarm of the monitoring device is invalid, and reset the communication port of the power supply and the monitoring device and the communication bus between the two, so as to repair the communication link between the two. It can be seen that when the communication between the monitoring device and the power supply is interrupted, the present application determines the false alarm of the monitoring device and repairs the communication link between the monitoring device and the power supply, thereby avoiding the false alarm problem caused by the interruption of communication between the monitoring device and the power supply. The invention also discloses a power monitoring system and a server, which have the same beneficial effects as the above power monitoring method.

The invention belongs to the technical field of aircraft radar clutter and interference rejection, and particularly relates to an aircraft radar ground moving target detection method under an intensive forwarding type interference environment. The aircraft radar ground moving target detection method under the intensive forwarding type interference environment comprises the following steps that a receiving array of an aircraft radar receives corresponding return signals in the corresponding direction, corresponding constant false-alarm detection is conducted in a Doppler channel range corresponding to a Doppler distinct area according to the return signals received in each direction of the aircraft radar, and corresponding constant false-alarm detection results are obtained; according to the constant false-alarm detection results, wave arriving directions of forwarded interference signals are obtained; then airspace guide vectors of the forwarded interference signals are obtained; according to the airspace guide vectors of the forwarded interference signals, the maximum likelihood estimation value of the ground moving target signal amplitude is obtained; a ground moving target is detected according to the maximum likelihood estimation value of the ground moving target signal amplitude.

An embodiment of the present invention provides an early warning device, including a transmitting mechanism, a two-dimensional grating, a receiving mechanism and an early warning mechanism. The transmitting mechanism is used to emit the first plane incident light and the second plane incident light; The two-dimensional grating is used to convert the first plane incident light and the second plane incident light into the first diffracted light and the second diffracted light respectively; the receiving mechanism and the transmitting mechanism are respectively arranged on the same side of the two-dimensional grating, and the receiving mechanism is used to receive the first diffracted light The first diffracted light and the second diffracted light, and obtain the interference image formed by the first diffracted light and the second diffracted light; the early warning mechanism is connected with the signal of the receiving mechanism to determine the stress value according to the interference image, and judge whether to issue an early warning according to the stress value Signal. The early warning device provided by the invention obtains the stress value based on the principle of grating interference, effectively solves the problem of false alarms and is not disturbed by the noise environment. The embodiment of the present invention also provides a glass fixing device, a glass early warning system and a glass early warning method.