scholarly journals A virtual time reversal method for passive source localization in a range-dependent waveguide

2014 ◽  
Vol 63 (21) ◽  
pp. 214303
Author(s):  
Zhang Tong-Wei ◽  
Yang Kun-De
Keyword(s):  
Source Localization ◽  
Time Reversal ◽  
Passive Source Localization ◽  
Virtual Time

scholarly journals M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror method

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Songzuo Liu ◽  
Habib Hussain Zuberi ◽  
Yi Lou ◽  
Muhmmad Bilal Farooq ◽  
Shahabuddin Shaikh ◽  
...  
Keyword(s):  
Acoustic Communication ◽  
Time Reversal ◽  
Spread Spectrum ◽  
Underwater Acoustic Communication ◽  
Half Cycle ◽  
Spreading Factor ◽  
Underwater Acoustic ◽  
Virtual Time ◽  
Chirp Spread Spectrum ◽  
Time Reversal Mirror

AbstractLinear chirp spread spectrum technique is widely used in underwater acoustic communication because of their resilience to high multipath and Doppler shift. Linear frequency modulated signal requires a high spreading factor to nearly reach orthogonality between two pairs of signals. On the other hand, nonlinear chirp spread spectrum signals can provide orthogonality at a low spreading factor. As a result, it improves spectral efficiency and is more insensitive to Doppler spread than the linear counterpart. To achieve a higher data rate, we propose two variants (half cycle sine and full cycle sine) of the M-ary nonlinear sine chirp spread spectrum technique based on virtual time-reversal mirror (VTRM). The proposed scheme uses different frequency bands to transmit chirp, and VTRM is used to improve the bit error rate due to high multipath. Its superior Doppler sensitivity makes it suitable for underwater acoustic communication. Furthermore, the proposed method uses a simple, low-power bank of matched filters; thus, it reduces the overall system complexity. Simulations are performed in different underwater acoustic channels to verify the robustness of the proposed scheme.

TDOA and RSSD Based Hybrid Passive Source Localization with Unknown Transmit Power

2018 ◽  
Vol 66 (4) ◽  
pp. 533-545
Author(s):  
Zengfeng Wang ◽  
Hao Zhang ◽  
Tingting Lu ◽  
Xing Liu ◽  
Zhaoqiang Wei ◽  
...  
Keyword(s):  
Source Localization ◽  
Transmit Power ◽  
Passive Source Localization
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