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

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.