基于单矢量差分能量检测器的扩频水声通信

发布时间：2019-06-04 04:03

【摘要】：通过获得扩频处理增益,直接序列扩频水声通信系统具有较高的稳定性,是高质量水声通信及远程水声通信的首选通信方式.但复杂的海洋环境使得直扩系统在解扩时受到载波相位跳变的影响,这将导致直扩系统的扩频处理增益下降.为此,本文针对直扩系统提出了差分能量检测器算法,通过比较接收端相关器输出能量完成解码,并与有源平均声强器算法相结合,提出单矢量差分能量检测器算法.该算法具有很好的抗载波相位跳变和多途扩展干扰的能力,并可对信号方位信息实时跟踪估计,利用估计方位进行矢量组合可获得矢量处理增益,从而保证直扩系统可以在低信噪比、时变信道条件下稳定工作.通过仿真分析和大连海试试验,验证了本文提出的单矢量差分能量检测器算法的有效性和稳健性.
[Abstract]:By obtaining the gain of spread spectrum processing, the direct sequence spread spectrum underwater acoustic communication system has high stability, and it is the first choice for high quality underwater acoustic communication and remote underwater acoustic communication. However, the complex marine environment makes the DSSS system affected by carrier phase jump in despreading, which will lead to the decrease of the spread spectrum processing gain of DSSS system. In this paper, a differential energy detector algorithm is proposed for DSSS system. By comparing the output energy of the receiver correlator to complete the decoding, and combining with the active average sound intensity algorithm, a single vector differential energy detector algorithm is proposed. The algorithm has good ability to resist carrier phase jump and multi-path spread interference, and can track and estimate the azimuth information of the signal in real time. The vector processing gain can be obtained by using the estimated azimuth vector combination. Thus, the DSSS system can work stably under the condition of low signal-to-noise ratio (SNR) and time-varying channel. The effectiveness and robustness of the single vector differential energy detector algorithm proposed in this paper are verified by simulation analysis and Dalian sea test.
【作者单位】：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国家自然科学基金(批准号:51179034,61471137,51509059,61501061) 中央高校基本科研业务费专项资金(批准号:heucfd1506,heucfx1505) 船舶预研支撑技术基金(批准号:13J3.1.5)资助的课题~~
【分类号】：TN929.3

【相似文献】