Abstract: The disclosure provides a subspace-based blind identification algorithm of an ocean underwater acoustic channel for multi-channel fir filter, which adopts a technical solution that a channel impulse response coefficient is calculated by quadratic minimization. The disclosure has beneficial effects that estimation precision can be met when using a proper number of samples, and especially when a few noise vectors are used for estimating channel parameters, so that calculation amount is greatly reduced.

Abstract: The disclosure provides a subspace-based blind identification algorithm of an ocean underwater acoustic channel for multi-channel fir filter, which adopts a technical solution that a channel impulse response coefficient is calculated by quadratic minimization. The disclosure has beneficial effects that estimation precision can be met when using a proper number of samples, and especially when a few noise vectors are used for estimating channel parameters, so that calculation amount is greatly reduced.

Abstract: The present invention discloses a system for real-time transmission of large-capacity of a deep-sea subsurface mooring based on a Beidou satellite. Data transmission is implemented by a mechanism of single module multi-card switching operation and dynamic subcontracting transmission. A receiving module is connected to a fixed card and is responsible for receiving state information on whether the transmission is successful. A subsurface mooring end antenna and a land-based antenna adopt a network analyzer to perform secondary matching on parameters such as frequency offset and impedance of the assembled antenna, and effectively intercept original data. In addition, arithmetic coding and dictionary coding are adopted for data compression. While an acquisition board terminal processes original valid data, the valid data is compressed to a maximum of one third of the original data, which can be extended into a parallel mode of multiple single-mode multi-card modules.