182results about How to "Low anti-interference" patented technology

The invention discloses a radar interference recognition signal processing system, and aims to provide a processing system which is simple and reliable in circuit and high in interference resistance. The radar interference recognition signal processing system is implemented according to the following technical scheme: in the signal processing circuit, a waveform generator sends generated modulation signals to a voltage-controlled oscillator, signals with the output frequency being fr are divided into two paths, one path of the signals are subjected to M times of frequency doubling amplification through a frequency doubling amplification circuit A and turned into signals with the frequency being M*fr, one part of the signals are transmitted through a transmitting antenna A, and another part of the signals are inputted into a down-conversion circuit A to act as local oscillation signals of the down-conversion circuit A; and the other path of the signals is subjected to frequency division of a frequency dividing circuit and turned into signals with the frequency being fr/L, one part of the signals are subjected to frequency doubling amplification of a frequency doubling amplification circuit B and turned into frequency doubling amplification signals which are transmitted through a transmitting antenna B, and another part of the signals are inputted into a down-conversion circuit B to act local oscillation signals of the down-conversion circuit B. Intermediate-frequency signals A and intermediate-frequency signals B are respectively subjected to interface recognition circuit down-conversion filtering, FFT (Fast Fourier Transform), non-coherence accumulation and threshold judgment, and interference recognition judgment signals are outputted.

The invention belongs to the technical field of electrical wire and cable production processes, and particularly relates to a cleaning-type oil-resistant cable. Conductors (1) are copper conductors, the structures of the conductors adopt a first type or a second type, a cross-linked polyethylene insulating layer (2) is extruded on the conductors (1) respectively by applying a warm water cross-linking technology to serve as a cable core, an inner lining layer (3) is arranged outside the cable core, an armor layer (4) is armored by back-twist type galvanized fine steel wires, aluminum-plastic composite tapes are longitudinally coated and welded outside the armor layer (4) to form a water and tide blocking layer (5), and a flame-retardant jacket layer (6) made of a butyronitrile material is arranged at the outermost layer. With a double-layer co-extrusion mode to extrude, the arrangement of the high-strength water and tide blocking layer capable of longitudinally preventing tension in the overall cable and a process of double-layer co-extrusion protection layers, the cleaning-type oil-resistant cable has not only very strong resistance to abrasion and oil, but also better resistance to cleaning, thereby the quality stability of the oil-resistant cable is improved and a new technical field is developed for the development of the cleaning-type oil-resistant cable.

A temperature control system comprises a plurality of distributed heat sources and a plurality of temperature sensors. Each heat source is connected with a respective power drive module, all power drive modules are controlled by a temperature controller, and a temperature control system takes a target temperature as reference input and output temperatures of the temperature sensors as feedback; tracking errors between the reference input and the output temperatures are input in the temperature controller, and the temperature controller converts the tracking errors into average errors, obtains error deviations between the average control quantity and the tracking errors and the average errors through calculation according to the average errors, obtains the superposition control quantity of each heat source according to the average errors and takes sum signals of the average control quantity and the superposition control quantities as the final output of the temperature controller. The temperature control system has the advantages of being low in dependence on single channels, high in anti-interference capacity and capable of performing uniformity control on temperatures of temperature boxes with distributed heat sources.

The invention discloses an optical detection system and device. The optical detection system comprises a laser, a non-polarizing beam splitter, a polarizing beam splitter, a transparent reflecting mirror and a measurement lens which are sequentially arranged from top to bottom. The non-polarizing beam splitter is horizontally arranged and corresponds to a photoelectric receiver A, a lambda/4 wave plate is fixed between the transparent reflecting mirror and the measurement lens, and the polarizing beam splitter is horizontally arranged and corresponds to a photoelectric receiver B. By means of the optical detection system and device, the problem that existing optical detection devices and existing non-contact microscopic measuring heads for surface topography measurement are poor in interference resisting capacity, limited in resolving power and the like is solved.

The invention belongs to the field of the wireless communication technology and particularly relates to a method and a device for restraining inter-cell interference of a high level modulating signal based on OFDM-IDMA (Orthogonal Frequency Division Multiplexing-Interleave-division Multiple Access). The invention adopts an OFDM signal sending and receiving system model based on IDMA; after being interwoven by an interweaver, a signal of a transmitter is modulated; and prior information of a received signal is updated by an ESE (Elementary Signal Estimator) estimator and a DEC (Direct Energy Conversion) decoder so as to reduce the interference. The device provided by the invention comprises a transmitter and a receiver for restraining inter-cell interference based on OFDM-IDMA. The method and the device provided by the invention can improve the anti-jamming capability of cell edge users in a heaver loading system.

The invention discloses a mobile robot positioning system. The mobile robot positioning system comprises a plurality of magnetic guiding rails which are arranged at a robot working place and are connected with one another in sequence; magnetic strips are arranged between a point to be monitored of the working place and every two adjacent magnetic guiding rails; the section between every two adjacent magnetic strips forms a working section of a robot operating along the magnetic guiding rails; the robot is provided with an industrial control computer; the front part and the rear part of a chassis of the robot are provided with a front row of magnetic sensors and a rear row of magnetic sensors which are used for detecting and outputting magnetic-field signals of the magnetic guiding rails and the magnetic strips when the robot travels on the magnetic guiding rails; the industrial control computer is used for receiving the magnetic-field signals outputted by the front row of magnetic sensors and the rear row of magnetic sensors and controlling the traveling state of the robot according to the magnetic-field signals and pre-stored information of operating paths of the robot so as to navigate and position the operation of the robot. The mobile robot positioning system disclosed by the invention has the advantages that when the navigation robot operates, the reliability is high and the positioning error is less.

The invention discloses an efficient isotope battery based on a gas radioactive source. The isotope battery comprises a battery base with an embedment groove, a radioactive light source support put in the embedment groove of the battery base, at least one radioactive source radiation light-emitting unit put on the radioactive light source support, a lens buckled on the embedment groove of the battery base and isolating the inside and the outside of the embedment groove, an output end support connected with the battery base, and a photovoltaic conversion unit put on the output end support, matched with the lens in position and used for outputting electric energy, wherein light rays emitted by all the radioactive source radiation light-emitting units are projected to the photovoltaic conversion unit after being gathered by the lens. A gas isotope radioactive source is ingeniously used for stimulating a radioactive light-emitting material to emit light, light rays are gathered on the photovoltaic conversion unit by the lens through the combination of an optics principle so that electric energy can be output, the light intensity on the photovoltaic conversion unit is greatly improved, the efficiency of the photovoltaic conversion unit is greatly improved, and the output power and the energy conversion efficiency of the isotope battery are improved.

The embodiment of the invention provides a positioning method, a terminal, LED (Light-Emitting Diode) control equipment and a system. The method comprises the following steps: receiving an optical signal transmitted by an LED light source, wherein the optical signal carries identification information relevant to a position at which the LED light source is positioned; resolving the optical signal, and determining the identification information; determining a geographic position relevant to the identification information according to preset geographic positions relevant to the identification information; and taking the determined geographic position as a positioning result. The positioning method provided by the embodiment of the invention is suitable for indoor positioning, has relatively high interference resistance, and is relatively low in power consumption.

The invention discloses a sensorless brushless DC motor starting method. The motor is formed by a stator and a permanent magnet rotor. The starting method comprises steps: pre-positioning is carried out; cyclic acceleration is carried out, voltage U for enabling the rotor to rotate acceleratively is applied to the stator, T2 time is continued, and position signals of the rotor are synchronously detected; when a position signal of a zero crossing point is detected during an operation process, commutation is carried out at once, and a closed-loop acceleration process is carried out; otherwise, voltage U is applied to the stator, T1 time is continued, position signals of the rotor are detected at the same time, when a position signal of a zero crossing point is detected, commutation is carried out at once, a closed-loop acceleration process is carried out, and if no position signal of the zero crossing point is detected, voltage U is increased, and the step is repeated; and closed-loop acceleration is carried out. According to the method provided by the invention, the problem of starting reliability of the sensorless brushless DC motor can be well solved, no starting curve needs to strictly designed, and the ability of adaptation to motor load fluctuation during the starting process can be improved.

The invention relates to a wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing. The method comprises the following step of combining a noise signal, a frequency steeping signal and the compressive sensing, so that the method combines advantages of the noise signal, the frequency steeping signal and the compressive sensing, keeps the advantages of frequency stepping signal narrowband treatment, and also has the features of low intercept probability of the noise signal, interference resistance, and good electromagnetic compatibility; and meanwhile, the method also combines the compressive sensing to obtain a high-resolution image by utilizing a low data amount. According to the method disclosed by the invention, under the condition that an observation target is sparse, the requirements of (ultra) wideband signals on receiver A/D (Analogue to Digital) sampling, storage and transmission equipment are reduced and the method is easy to realize, so that the wideband frequency-modulation stepping noise radar signal processing method based on the compressive sensing has important real meaning to an actual system.

The invention belongs to the field of gas extraction and relates to a gas extraction pipeline continuous and automatic drainage and deslagging device. The gas extraction pipeline continuous and automatic drainage and deslagging device is composed of a main device tank, a water tank, a gas extraction inlet, a gas negative-pressure extraction port, a condensing system, a pressure regulating system, a control system, a drainage and deslagging system, a water level monitoring system, a water and slag mixer, a pressure monitoring system, a separating plate guide groove and a separating plate, wherein the water tank is arranged inside the main device tank and separated into an upper tank body and a lower tank body by the separating plate; the condensing system can condense steam inside gas and collecting water into the water tank; the water level monitoring system and the pressure monitoring system are connected with a control system so that the control system can control opening and closing of the separating plate as well as pressure regulation of the pressure regulating system; water and slag can be uniformly mixed by the water and slag mixer and then drained via the drainage and deslagging system. The gas extraction pipeline continuous and automatic drainage and deslagging device is stable in system operation, high in interference resistance, convenient to arrange, full in automation and capable of saving manual operation and achieving continuous and efficiency operation.

The invention discloses a frequency converter output short circuit protection circuit and a protection method thereof. The protection circuit comprises a current detecting module, a current operational amplifier processing module, an anti-jamming processing module and a PWM (pulse width modulation) control lockout output module, wherein the current detecting module is used for detecting UVW three-phase current of a motor, the current operational amplifier processing module is used for amplifying the detected UVW three-phase current to obtain an amplifying signal, the anti-jamming processing module is used for comparing the amplifying signal with a reference signal to obtain an output short circuit signal, and the PWM control lockout output module is used for locking out a driving signal of the motor according to the short circuit signal. The frequency converter output short circuit protection circuit and the protection method effectively solve the technical problems of imperfect three-phase output short circuit protection, slow dynamic response and poor anti-jamming capability of a system.

The invention relates to a control method of a lockup clutch state collecting circuit. When the radio frequency identification (RFID) electronic tag of the collecting circuit integrating the lockup clutch state or the RFID device of the collecting circuit adopting the lockup clutch state is in a RFID field, the control method comprises the step (a) and other steps, wherein the step (a) is that the RFID electronic tag or the RFID device enters the RFID field, the radio frequency analog front-end of the RFID electronic tag is electrified to work. The beneficial effects of the invention are as follows: the lockup clutch state collecting circuit of the invention has the advantages of low power consumption and interference resistance; and as the lockup clutch state collecting circuit can be integrated in the electronic tag, the collecting circuit is easier to combine with the electronic tag to be used as the monitoring node of the Internet of things for moving containers and proof boxes in the logistics industry, thus timely monitoring the lockup clutch state of containers and proof boxes and ensuring the safety of moving containers and proof boxes.