摘要
蛙人超短基线(Ultra-Short Base Line, USBL)定位设备实现浅水环境下高精度定位的关键技术之一是精确的时延估计。由于自适应时延估计方法具备环境自适应能力强的特点,文章将混合调制的拉格朗日直接时延估计方法应用于蛙人USBL定位时的高精度测向上,它可以在信标信号中心频率已知的情况下将小数时延滤波器调制到信号中心频率处,以较低的阶数提供更高的时延估计精度;并根据USBL阵型和信号自身的特点,对混合调制的拉格朗日直接时延估计在低信噪比下的具体使用模式进行了探讨和仿真验证;结果显示,所采用的自适应时延估计方法可以在中低信噪比下提供1°~3°的定位测向精度。
The accuracy of frogman Ultra-Short Base Line(USBL) positioning in shallow water largely depends on the direction finding accuracy of the array, which is determined by time delay estimation accuracy. Due to the robust environmental adaptability of adaptive time delay estimation method, the mixed modulated Lagrange explicit time delay estimation(MMLETDE) algorithm is applied to direction finding in frogman USBL positioning, which could modulate the decimal delay filter to the center frequency of beacon signal and provide higher time delay estimation accuracy with lower orders, when the center frequency of beacon signal is known. According to the USBL array geometry and the features of the array signals, the use of MMLETDE under low signal to noise ratio(SNR) is discussed and simulated, and the results show that the direction finding accuracy of 1 °~ 3 ° could be obtained under medium or low SNR.
作者
段江涛
石建飞
程俊
田甜
李兆利
DUAN Jiangtao;SHI Jianfei;CHENG Jun;TIAN Tian;LI Zhaoli(No.3 Research Institute of China Electronics Technology Group Company,Beijing 100015,China;National Astronomical Observatories,Chinese Academy of Science,Beijing 100101,China)
出处
《声学技术》
CSCD
北大核心
2020年第4期505-510,共6页
Technical Acoustics
基金
国家重点研发计划公共安全项目(2017YFC0821200、2017YFC0821201)资助项目。
关键词
超短基线
自适应时延估计
蛙人定位
混合调制拉格朗日直接时延估计
Ultra-Short Base Line(USBL)
adaptive time delay estimation
frogman location
mixed modulated Lagrange explicit time delay estimation(MMLETDE)
