深海声探测中伪随机编码信号的仿真研究
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摘要
目前国际上正在使用多脉冲(MultiPing)探测方式来解决深海探测中探测效率不高的问题,但可能存在回波识别和波达时间定位的问题,提出了利用伪随机编码信号的解决方法。以6 000 m深海海底探测为研究对象,设计发射不同编码信号,对其回波识别和定位进行了仿真和比较,同时对不同编码类型的回波识别性能随噪声变化情况进行了讨论。Walsh码拥有更加出色的回波识别性能,但在波达时间定位方面易出现误差,同时随着噪声的增强,回波识别性能明显下降;m序列拥有出色的波达时间定位性能,但回波识别性能不如Walsh码;Gold码在回波识别性能和波达时间定位性能方面有着较好的平衡表现。
At present, the MultiPing detection method is being used to solve the problem of low detection efficiency in deep sea exploration, but there may be some problems in echo recognition and TOA(time-of-arrival) location. In the paper a solution using pseudo-random coded signals is proposed. Taking 6000 m deep sea bottom detection as the study object, different coded signals are designed and transmitted, and their echo recognition and location are simulated and compared. At the same time, the variations of echo recognition performance of different coding types with noise are discussed. The study shows that the Walsh code has better performance of echo recognition, but errors are easy to occur in TOA location, and the performance of the echo recognition is obviously decreased with the increase of noise. The m sequence has excellent performance of TOA location,, but the performance of echo recognition is not as good as that of Walsh code. The Gold code has a good balance between echo recognition performance and TOA location performance.
At present, the MultiPing detection method is being used to solve the problem of low detection efficiency in deep sea exploration, but there may be some problems in echo recognition and TOA(time-of-arrival) location. In the paper a solution using pseudo-random coded signals is proposed. Taking 6000 m deep sea bottom detection as the study object, different coded signals are designed and transmitted, and their echo recognition and location are simulated and compared. At the same time, the variations of echo recognition performance of different coding types with noise are discussed. The study shows that the Walsh code has better performance of echo recognition, but errors are easy to occur in TOA location, and the performance of the echo recognition is obviously decreased with the increase of noise. The m sequence has excellent performance of TOA location,, but the performance of echo recognition is not as good as that of Walsh code. The Gold code has a good balance between echo recognition performance and TOA location performance.
引文
[1]胡昌顺.单波束测深仪系统仿真设计[D].哈尔滨:哈尔滨工程大学,2012.HU Changshun.System simulation design of single beam echo sounder[D].Harbin:Harbin Engineering University,2012.
[2]丁维凤,李家彪,苏希华,等.声学地层剖面深水探测研究与开发[J].海洋学报,2015,37(6):70-77.DING Weifeng,li Jiabiao,SU Xihua,et al.Technology research and development for acoustic subbottom survey in deep sea[J].Acta Oceanologica Sinica,2015,37(6):70-77.
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[4]SyQwest Incorporation.Bathy 2010TMCHIRP sub bottom profiler and bathymetric echo sounder[OL].2011.http://www.syqwestinc.com.
[5]李婷.CDMA扩频通信系统地址码的研究[D].大连:大连海事大学,2006.LI Ting.The study of the address code used in CDMA spreading spectrum communication system[D].Dalian:Dalian Maritime University,2006.
[6]蒋强.GOLD码相关性及可编程实现[J].微计算机信息,2012,28(2):136-137.JIANG Qiang.The relevance and the program realization of GOLD[J].Microcomputer Information,2012,28(2):136-137.
[7]吴海红.CDMA扩频通信中m序列与Gold序列的比较及应用[J].喀什师范学院学报(汉文版),2010,31(3):39-43.WU Haihong.Comparison and application of in CDMA wide frequency correspondence M sequence and Gold sequence[J].Journal of Kashgar Teachers College(in Chinese),2010,31(3):39-43.
[2]丁维凤,李家彪,苏希华,等.声学地层剖面深水探测研究与开发[J].海洋学报,2015,37(6):70-77.DING Weifeng,li Jiabiao,SU Xihua,et al.Technology research and development for acoustic subbottom survey in deep sea[J].Acta Oceanologica Sinica,2015,37(6):70-77.
[3]Benthos Corporation.CAP-6600ChirpⅢacoustic profiling system manual[OL].1996.http://www.benthos.com.
[4]SyQwest Incorporation.Bathy 2010TMCHIRP sub bottom profiler and bathymetric echo sounder[OL].2011.http://www.syqwestinc.com.
[5]李婷.CDMA扩频通信系统地址码的研究[D].大连:大连海事大学,2006.LI Ting.The study of the address code used in CDMA spreading spectrum communication system[D].Dalian:Dalian Maritime University,2006.
[6]蒋强.GOLD码相关性及可编程实现[J].微计算机信息,2012,28(2):136-137.JIANG Qiang.The relevance and the program realization of GOLD[J].Microcomputer Information,2012,28(2):136-137.
[7]吴海红.CDMA扩频通信中m序列与Gold序列的比较及应用[J].喀什师范学院学报(汉文版),2010,31(3):39-43.WU Haihong.Comparison and application of in CDMA wide frequency correspondence M sequence and Gold sequence[J].Journal of Kashgar Teachers College(in Chinese),2010,31(3):39-43.