34results about How to "Solve mutual coupling" patented technology

The related vertical-polarized single-channel digital radio monitor and interferometer direction- finding fixed station system comprises: a direction-finding antenna for big fundamental interferometer, two electric switch units, an antenna selector, a RF pre-processor, a three- functional RF amplifiers, a single-channel receiver, a monitor controller, a industrial control computer, a high / low vertical polarized monitor antenna, a hub, a monitor and remote control unit for environment, and a UPS. This invention overcomes coupling among antennas, fit to process RF signal, enlarges dynamic application range for received signal, and has high feature-price rate.

The invention discloses an interference coherent robust beamforming method with unknown mutual coupling information under mutual coupling conditions. The invention relates to a beamforming technique belonging to the field of adaptive array signal processing. Based on the particularity of the array mutual coupling structure, the present invention respectively reconstructs the interference-plus-noise covariance matrix and the desired signal covariance matrix when the specific information of the array mutual coupling is unknown, and finally obtains the final weight vector. The present invention does not need to know the mutual coupling information in advance, and neither needs to estimate the steering vector of the desired signal, nor needs to perform any spatial smoothing decoherence processing. It maintains very good performance when the expected signal power is strong and weak, and can converge quickly.

The present invention is a dual-polarization single-channel all-digital radio monitoring and direction-finding mobile station system, including a vertical polarization interferometer direction-finding antenna array, a horizontal polarization interferometer direction-finding antenna array, a vertical polarization monitoring antenna, and a horizontal polarization monitoring antenna , the first rotary switch unit, the second rotary switch unit, the first selector, the first three-function RF amplifier, the second three-function RF amplifier, RF preprocessor, single-channel monitoring direction-finding receiver, PC Machine, monitoring and direction finding processor, second selector, first RF amplifier, nth RF amplifier, inverter power supply, head position indicator, GPS, electronic compass, printer, router. Advantages: The composite active dual-polarization interferometer direction-finding antenna array is used to solve the problem of mutual coupling between antenna array elements. A pair of antenna elements are sampled at the same time to ensure synchronization, fast and accurate. The RF preprocessor is used for phase / amplitude / phase conversion and storage of the RF signal. Amplifier with amplification, straight-through, and attenuation functions, automatic switching, expanding the dynamic application range of received signals, high direction finding accuracy and sensitivity, stable and reliable, and excellent cost performance.

The invention relates to a maritime radio communication monitoring and direction finding system which is characterized by comprising a vertical polarization monitoring and direction finding antenna array, a five-channel signal switching module, an amplification module, a five-channel receiver, a digital signal processor (DSP) processing module, a computer, a monitoring and direction finding controller, a 3rd generation (3G) antenna, a radio station antenna, a 3G router, a digital broadcasting station, a switchboard, an electronic compass, a global positioning system (GSP) module and a GSP antenna. The maritime radio communication monitoring and direction finding system has the advantages that: an interfering signal can be monitored better due to the working frequencies ranging from 30 to 500MHz; simultaneous direction finding of several coherent waves is realized; simultaneous direction finding and ultrahigh-resolution digital direction finding of transmitting signals with same frequency and different directions are realized; direction finding of digital frequency hopping, a spread spectrum and a burst signal is realized; monitoring and measuring on different frequency domains, different time domains and different modulation domains can be simultaneously performed during measuring due to respective local oscillation of five channels; the problem of cross coupling among all antenna array elements is solved; the coupling and the phase ambiguity among unit antennas are removed; and dynamic application ranges of received signals are expanded.

The invention discloses an optical image stabilization device based on piezoelectric stacking, comprising a lens mounting bracket, the lens mounting bracket is located in the displacement amplifying direction of a first displacement amplifying module, and is connected to the first displacement amplifying module through a connecting block. In the first rectangular frame; the first rectangular frame is located in the displacement amplifying direction of the second displacement amplifying module, and the second displacement amplifying module is connected by a connecting block, and the whole is arranged in the second rectangular frame; the first and second displacement amplifying modules The modules are arranged in parallel, and the two extend under the action of the applied voltage, respectively producing positive and negative displacement outputs acting on the lens mount. The displacement amplifying module of the present invention decouples the displacement in the forward and reverse directions, so that the piezoelectric stack does not need a pre-voltage to maintain a certain pre-displacement in the initial stage. A closed-loop control system is also designed in the present invention, the displacement index is tested by the built-in displacement sensor of the image stabilization device, and the central processing unit module calculates and performs high-precision displacement control.

The invention relates to a nine-channel space spectrum super-resolution estimation monitoring and direction-finding mobile station system, which comprises a small double-cone omnidirectional monitoring antenna, a nine-unit direction-finding antenna, an amplifier, a monopole monitoring antenna, a nine-channel signal switching module, a filter combiner, am amplifier module, a nine-channel receiver,a monitoring and direction-finding controller, a DSP (Digital Signal Processor) processing module, an imbedded industrial computer, a GPS (Global Positioning System) antenna, a GPS module, a 3G (3rd Generation) antenna, a 3G router, a power supply module, a remote control unit, an exchanger, and the like. The system has the following advantages: the system achieves remote and automatic monitoringand direction-finding of radio signals; an imbedded computer system is integrally arranged so that the structure is compact and light; a direction-dinging assembly solves the coupling problem betweenthe antenna arrays and prevents coupling and phase between unit antennas from being blurred; the structure is compact and light, and the spanning maintenance is convenient; the grid connection is flexible, and can support different wired / wireless network data transmissions; moreover, collection, compression coding, automatic task monitoring, statistic analysis and abnormal state alarm of wirelesssignals are realized.

The invention discloses a single-channel array transmitting antenna based on two-phase code modulation. The antenna mainly solves the problems that an existing common array transmitting antenna is complex in structure, large in size, high in price and inconsistent in amplitude phase due to multiple channels. The single-channel array transmitting antenna comprises a waveform generator (1), a first-level modulation phase shifter (2), a digital-to-analog converter (3), an up converter (4), a low-noise amplifier (5), a second-level modulation phase shifter (6) and an antenna element (7), wherein two-phase modulation is carried out on a signal produced by the waveform generator (1) through the first-level modulation phase shifter to form a single-channel signal in a polymerization mode, the signal sequentially undergoes signal form conversion through the digital-to-analog converter (3), frequency mixing through the up converter (4) and amplification through the low-noise amplifier (5), then a simulation radio-frequency signal is obtained, the signal undergoes orthogonal demodulation and filtering processing through the second-level modulation phase shifter (6) and is output as a multi-channel signal, and the signal undergoes signal form conversion through the antenna element (7) to be transmitted. On the premise that conventional array transmitting antenna performance is guaranteed, the structure is simplified, the size is reduced, and amplitude phase consistency of the antenna is improved.

The invention discloses a nine-channel spatial spectrum estimation super-resolution monitoring direction-finding fixed station system, which is characterized by comprising a small biconical omnibearing monitoring antenna, a nine-unit direction-finding antenna array, two functional amplifiers, a monopole monitoring antenna, a nine-channel signal switching module, a filtering combiner, an amplifier module, a nine-channel receiver, a monitoring direct-finding controller, a digital signal processor (DSP) processing module, an embedded industrial personal computer, a global positioning system (GPS) antenna, a GPS module, a 3rd generation (3G) antenna, a 3G route, a power supply module, a continuous power supply module, a remote control unit and a switchboard which are shown in a figure in the specifications. The system has the advantage that: resolution and interception of a same-frequency multi-point transmitted signal can be solved. Coherent signals caused by a plurality of paths can be distinguished under a certain condition and can be widely applied to radio direction finding in a complex electromagnetic environment. A spatial spectrum system has high multipath effect resistance, high sensitivity, high monitoring and direction finding speeds and high accuracy, and can be used for quickly capturing various digital frequency hopping, frequency spreading and frequency hopping and spreading signals.