This paper presents an approach to the challenging is- sue of passive source localization in shallow water using a mobile short horizontal linear array with length less than ten meters. The short array can be convenie...This paper presents an approach to the challenging is- sue of passive source localization in shallow water using a mobile short horizontal linear array with length less than ten meters. The short array can be conveniently placed on autonomous underwa- ter vehicles and deployed for adaptive spatial sampling. However, the use of such small aperture passive sonar systems makes it difficult to acquire sufficient spatial gain for localizing long-range sources. To meet the requirement, a localization approach that employs matched-field based techniques that enable the short ho- rizontal linear array is used to passively localize acoustic sources in shallow water. Furthermore, the broadband processing and inter-position processing provide robustness against ocean en- vironmental mismatch and enhance the stability of the estimation process. The proposed approach＇s ability to localize acoustic sources in shallow water at different signal-to-noise ratios is examined through the synthetic test cases where the sources are located at the endfire and some other bearing of the mobile short horizontal linear array. The presented results demonstrate that the positional parameters of the estimated source build up over time as the array moves at a low speed along a straight line at a constant depth.展开更多
Matched-field processing (MFP) and matched-mode processing (MMP) are passive range and depth source localization technique that have been extensively used in shallow-water nvironments. In this paper a new technique of...Matched-field processing (MFP) and matched-mode processing (MMP) are passive range and depth source localization technique that have been extensively used in shallow-water nvironments. In this paper a new technique of normal-mode filtering and the simulated results on source localization of a short horizontal array are presented. The results of MMP are compared to those obtained by conventional MFP. The simulated results indicate that for MMP source location the resolution is higher than that of MFP's and the sidelobe rejection is improved, the expense of the computational time is less. The effects of system mismatching are also given.展开更多
The matched-mode processing is an important method of source localization and detection for a distant underwater target. In this paper, a fast iterative method of mode decomposition for a short vertical array is prese...The matched-mode processing is an important method of source localization and detection for a distant underwater target. In this paper, a fast iterative method of mode decomposition for a short vertical array is presented. It has very fast convergent speed. By the matched-mode processing with the iterated mode amplitude vector, the accuracy of source range and depth estimation are obviously raised, and the sidelobes are effectively suppressed.This method is used to reduce the length requirement of array and it has potential application prospects. With the simulated calculation of the Pekeris model and the Arctic Ocean channel,we prov that the new method of mode decomposition is reasonable and effective. The experiment of source localization for a short vertical array has been successfully performed from a Qingdao site, the Yellow Sea in December of 1993.展开更多
基金supported by the State Scholarship Fund(2011611091)supported by China Shipbuilding Industry Corporation
文摘This paper presents an approach to the challenging is- sue of passive source localization in shallow water using a mobile short horizontal linear array with length less than ten meters. The short array can be conveniently placed on autonomous underwa- ter vehicles and deployed for adaptive spatial sampling. However, the use of such small aperture passive sonar systems makes it difficult to acquire sufficient spatial gain for localizing long-range sources. To meet the requirement, a localization approach that employs matched-field based techniques that enable the short ho- rizontal linear array is used to passively localize acoustic sources in shallow water. Furthermore, the broadband processing and inter-position processing provide robustness against ocean en- vironmental mismatch and enhance the stability of the estimation process. The proposed approach＇s ability to localize acoustic sources in shallow water at different signal-to-noise ratios is examined through the synthetic test cases where the sources are located at the endfire and some other bearing of the mobile short horizontal linear array. The presented results demonstrate that the positional parameters of the estimated source build up over time as the array moves at a low speed along a straight line at a constant depth.
文摘Matched-field processing (MFP) and matched-mode processing (MMP) are passive range and depth source localization technique that have been extensively used in shallow-water nvironments. In this paper a new technique of normal-mode filtering and the simulated results on source localization of a short horizontal array are presented. The results of MMP are compared to those obtained by conventional MFP. The simulated results indicate that for MMP source location the resolution is higher than that of MFP's and the sidelobe rejection is improved, the expense of the computational time is less. The effects of system mismatching are also given.
文摘The matched-mode processing is an important method of source localization and detection for a distant underwater target. In this paper, a fast iterative method of mode decomposition for a short vertical array is presented. It has very fast convergent speed. By the matched-mode processing with the iterated mode amplitude vector, the accuracy of source range and depth estimation are obviously raised, and the sidelobes are effectively suppressed.This method is used to reduce the length requirement of array and it has potential application prospects. With the simulated calculation of the Pekeris model and the Arctic Ocean channel,we prov that the new method of mode decomposition is reasonable and effective. The experiment of source localization for a short vertical array has been successfully performed from a Qingdao site, the Yellow Sea in December of 1993.
