High-accuracy real-time Doppler estimation is one of the key problems in underwater
acoustic communication systems. Using the dual-hyperbolic-frequency-modulation (dual …

To address the issue of robust parameter estimation of hyperbolic frequency modulated
(HFM) signals under low signal-to-noise ratios (SNRs), an improved algorithm based on …

Underwater gliders are widely used in ocean observation with long operational endurance.
Since gliders use buoyancy to generate gliding motion through water columns with a pair of …

The channel in the marine environment is a time‐varying and space‐varying channel. Pulse‐
truncated continuous wave (PCW) speed measurement is often used in sonar, but the …

In the waveform design, the distance measurement and resolution are a pair of
irreconcilable contradictions. Linear Frequency Modulation (LFM) can alleviate this …

This paper presents a fast and robust method for estimating the starting frequency and
period slope of hyperbolic frequency modulated (HFM) signals. The method involves, first …

In this paper, we investigate the performance of HFM signals for timing synchronization in
underwater acoustic communication systems. The considered HFM signals are comprised of …

In this paper, a bat-inspired high-resolution ultrasound 3D imaging system is presented. Live
bats demonstrate that the properly used ultrasound can be used to perceive 3D space. With …

Nonlinear frequency-modulated signals have been effectively applied in multiple-user
communication schemes. In this paper, we propose to implement a multiple-user …

This paper details the wideband ambiguity function of hyperbolic frequency modulation
(HFM) signal, because the ambiguity function of the HFM signal is coupled in the range …