Discovery high quality sonar data with the TSR-1000 Echosounder. The TSR-1000 Echosounder is a coherent single beam sonar designed for applications where underwater range or depth measurement is required.. The sonar is coherent from ping to ping, generating in-phase and quadrature components (I and Q) of the returned signal. The coherent nature of the TSR-1000 Echosounder also enables the detection of motion in stationary targets and one dimensional current profiling.