2results about How to "Implement noise reduction processing" patented technology

The application relates to a MUSIC direction-finding method based on an underwater information system cross array, and belongs to the technical field of underwater acoustic direction finding. In view of the problems of low signal-to-noise ratio and low direction-finding precision of underwater signal direction finding, the application provides a MUSIC direction-finding method based on an underwater information system cross array. The method is based on a MUSIC algorithm, frequency extraction and spatial spectrum accumulation, a cross array is used to perform direction-finding processing on a signal, the relative position relationship between the signal and the cross array is obtained, a suitable linear array in the cross array is selected to perform direction-finding processing on the signal, and the direction finding of an underwater target acoustic signal under low signal-to-noise ratio can be effectively realized.

The application relates to the technical field of data transmission, in particular to a circuit for current signal long-line transmission data processing. The circuit comprises an isolation power supply, a first module, a sampling resistor R1, a second module and a third module; the first module is used for data acquisition, coding and modulation into a current signal; the second module is used for voltage signal processing and outputs the processed voltage signal to the third module; the third module is used for voltage signal decoding, storage and display; the isolation power supply, the first module and the sampling resistor R1 are sequentially and in series connected on a dry line; the second module is connected in parallel with the sampling resistor R1; the sampling resistor R1 is indirectly connected with the first module; the second module comprises a capacitor C0, an operational amplifier circuit and a second-order low-pass filter circuit; the capacitor C0 is connected in parallel with the sampling resistor R1; the operational amplifier circuit and the second-order low-pass filter circuit are connected in series and then connected in parallel with the sampling resistor R1; the output end of the second-order low-pass filter circuit is connected with the third module, so that signal filtering and noise reduction are realized.