大型儲罐水聲信道建模及通信方案研究
[Abstract]:China is an energy power, with the rapid development of the national economy, our country's demand for oil is increasing. As an important facility for oil storage, large-scale oil storage tanks are of great concern at the same time of rapid growth. In the event of an accident, the oil storage tank will cause great economic loss and even threaten the life, property safety and great influence. In this paper, based on the application of the on-line detection system of the tank bottom of the oil storage tank based on the wandering type wireless sensor node, the underwater acoustic communication technology and the implementation scheme in the closed space of the storage tank are studied. The main work includes the following aspects: (1) the underwater acoustic channel model of the storage tank is established, The impulse response of the underwater acoustic channel with different shapes and different sizes is defined, the characteristics of multi-path signals in the tank space are discussed, and the multi-path effect in the ocean is compared and analyzed, which provides a theoretical basis for constructing the underwater acoustic communication scheme suitable for the application in the storage tank. (2) In view of the characteristics of the underwater acoustic channel in the storage tank and the requirements of the underwater acoustic communication, the direct sequence spread spectrum OFDM communication scheme is proposed, and the anti-multipath performance of the spread spectrum OFDM communication scheme is analyzed, and the channel coding scheme of the spread spectrum OFDM is discussed. The computer simulation and the test data show that the spread spectrum OFDM has more reliable transmission performance in the tank space than the traditional OFDM method. (3) The mobile sensing node needs to transmit the collected corrosion acoustic emission data back to the central control station during the detection process, which requires as high a transmission rate as possible. The spreading process of the spread spectrum ofdm system scheme results in a waste of spectrum resources. In this paper, based on the characteristics of the short-spectrum sequence in the detection and application of the corrosion-acoustic emission of the storage tank, a method for spreading the OFDM by using the mapping sequence is proposed. The simulation and test prove that the transmission efficiency of the mapping sequence spread spectrum OFDM scheme is more than twice the transmission efficiency of the direct sequence spread spectrum OFDM scheme. (4) The influence of the Doppler frequency shift on the spread spectrum OFDM underwater acoustic communication system in the storage tank is analyzed, and the Doppler factor estimation method based on the maximum correlation peak shift is proposed. The two-step compensation method is adopted to compensate the Doppler frequency shift, and the calculation is simple, the calculation amount is small, and the need of real-time processing can be met. The experimental results show that the influence of Doppler shift on communication can be effectively eliminated by using the estimation and compensation method of this paper.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:TE973
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