Modeling Pulse-to-Pulse Coherent Doppler Sonar

Pulse subtraction Doppler

Recent advances have demonstrated the feasibility of molecular imaging using targeted microbubbles and ultrasound. One technical challenge is to selectively detect attached bubbles from those freely flowing bubbles and surrounding tissue. Pulse Inversion Doppler is an imaging technique enabling the selective detection of both static and moving ultrasound contrast agents: linear scatterers gener...

Pulse-Diverse Radar/Sonar FSK-PSK Waveform Design to Emphasize/De-emphasize Designated Doppler-Delay Sectors

This paper explores how pulse-diverse modulation of an FSK-PSK modulated pulse train enhances exibility to shape the size and distribution of the pulse train's ambiguity volume on the Doppler-delay plane. Pulse-diverse modulation compresses each pulse in the pulse train di erently. Based on a priori information of the relative criticality of various Doppler-delay regions, (e.g., the presence of...

Chapter 17 Pulse Doppler Radar

Two-pulse atomic coherent control

Two-pulse atomic coherent control (2PACC) spectroscopy is presented. The idea is demonstrated by simulating a source consisting of a two-pulse atom laser impinging on a surface covered with a co-adsorbed atom. The controlled outcome is an Eley–Rideal chemical reaction where the controls are the time delay and relative phase between the twopulses. The two atom laser pulses interfere with each ot...

Lidar-radar velocimetry using a pulse-to-pulse coherent rf-modulated Q-switched laser.

An rf-modulated pulse train from a passively Q-switched Nd:YAG laser has been generated using an extra-cavity acousto-optic modulator. The rf modulation reproduces the spectral quality of the local oscillator. It leads to a high pulse-to-pulse phase coherence, i.e., phase memory, over thousands of pulses. The potentialities of this transmitter for lidar-radar are demonstrated by performing Dopp...