A Wave Data Compression and Reconstruction Method
A data compression and wave technology, applied in the direction of code conversion, electrical components, etc., can solve the problems of large amount of data, unable to realize real-time monitoring, unable to meet the sampling rate of the wave height meter, etc., to achieve the effect of compressing space, eliminating noise, and increasing speed
Active Publication Date: 2018-10-19
NANJING HYDRAULIC RES INST
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Problems solved by technology
[0005] However, in the large-scale river engineering model test, the amount of data is too large, and the combination of the above two methods still cannot meet the requirements of high-speed and real-time transmission of a large amount of data in the test process
[0006] In the experiment of the large-scale river engineering model, because the survey range is wide, the measurement points are many, and the real-time measurement rate of each point is fast, the measured data volume is very large. The multi-channel adaptive wireless transmission technology still cannot meet the sampling requirements of the wave height meter. rate, it is impossible to realize real-time monitoring
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[0024] The specific implementation process of the present invention will be described below in conjunction with the accompanying drawings and embodiments.
[0025] A wave data compression and reconstruction method, comprising the following steps:
[0026] (1) Use bior3.7 wavelet to design wavelet filter bank, wavelet filter bank includes a low-pass filter bank and a high-pass filter bank, both low-pass filter bank and high-pass filter bank include analysis filter bank and heavy-pass filter bank Construct the filter bank in two parts. Using these two sets of filter coefficients, construct figure 1 As shown in the two-stage analysis filter bank, each filter bank includes a low-pass filter bank and a high-pass filter bank to form a four-channel filter;
[0027] (2) Collect 64 pieces of data, and carry out signal extension at both ends of the collected signal;
[0028] (3) Use the filter bank to perform continuous filtering and data extraction processing on x(k), and obtain d ...
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The invention discloses a method for compressing and reestablishing wave data. The method comprises the steps of selecting bior3.7 wavelets to establish multi-scale decomposition filter groups, and determining that the wavelets are decomposed into two layers, wherein each stage of filter group comprises a low-pass filter group and a high-pass filter group, and all filters are four-passage filters; collecting 64 wave data, and carrying out signal extension on two ends of the collected signals; carrying out continuous filter processing and data extracting processing on the wave data by utilizing the filter groups, and obtaining four groups of data, wherein each group comprises 16 points; selecting a threshold value to carry out soft threshold quantitative processing on a high-frequency coefficient and a low-frequency coefficient in each layer of the first layer and the second layer; carrying out one-dimensional coding on quantified conversion coefficients; ranking the quantified conversion coefficients according to a layer sequence, and carrying out LWZ coding; reestablishing the wavelets of the wave data. After data collected by a wave-height meter is processed by the method, not only is noise eliminated for the collected data, but also the space occupied by the collected data is also compressed, and the wireless transmission speed is increased.
Description
technical field [0001] The invention relates to the field of data processing in large-scale river engineering model tests, in particular to a fast compression method and a data reconstruction method for large data in wave tests. Background technique [0002] In the large-scale river engineering model test, the measurement coverage is wide and there are many measurement points. When doing the wave height meter test, the sampling data of each measurement point is 50 points per second, and the data rate is about 800bit. With the increase of the number of wave altimeters, the amount of data will become very large. Assuming a 60-channel wave height meter as an example, the amount of data transmitted per second is 48K, considering the encoding header and encoding tail, the actual data rate will exceed 70Kbps. Considering the various data transmissions before the data reaches the wireless transmitter and the various data transmissions after it reaches the receiving end, the transm...
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IPC IPC(8): H03M7/30
Inventor 夏云峰黄海龙王驰霍晓燕房红兵金捷陈诚周良平
Owner NANJING HYDRAULIC RES INST