2results about How to "Guaranteed filtering accuracy" patented technology

The application discloses a filter and a synchronization signal processing method. The filter comprises a first filter set and a second filter set; input ends of the first filter set and the second filter set are connected to a signal sampling component; output ends of the first filter set and the second filter set are connected to a filter output end; the signal sampling component is used for collecting a double-sampling-point communication signal and transmitting the communication signal to the first filter set and the second filter set; the first filter set is used for receiving a first communication signal and filtering the first communication signal to obtain a first filtered signal; the second filter set is used for receiving a second communication signal and filtering the second communication signal to obtain a second filtered signal; and the filter output end is used for coupling the first filtered signal and the second filtered signal to obtain a final filtered signal. According to the embodiment of the application, the downsampling is realized while the filtering precision is ensured, and the operation amount is reduced.

The invention relates to the technical field of underwater acoustics and inertial navigation integrated navigation, in particular to a USBL delay compensation method and system based on selection state augmented information filtering, and the method comprises the steps: predicting an information matrix and an information vector at a current moment based on navigation state information vector estimation and a navigation state covariance information matrix at a previous moment; constructing an augmented information matrix of a diagonal structure based on the augmented state vector and obtaining an augmented information vector; and calculating a measurement information matrix and an information vector increment corresponding to each delay measurement, and executing additive updating operation to construct a newly-added wide information matrix and a newly-added wide information vector with delay measurement at the current moment so as to recover the navigation state at the current moment by utilizing a Schur compensation method. According to the method, the Markov characteristics of the navigation system are utilized to construct the augmented information matrix with a block diagonal structure, the sparsity of the matrix is fully mined, and the real-time performance and numerical stability requirements of the underwater navigation system are ensured by utilizing the advantages of information filtering in the aspect of measurement updating.