AN/WQN-2 Doppler Sonar Velocity Log System
The Doppler Sonar Velocity Log (DSVL) System AN/WQN-2 is a speed measuring sensor which functions by transmitting acoustic energy of a specific frequency and receiving returns from the reflection medium as a result of the transmissions. The shift in frequency (Doppler shift) in the returned signals with respect to the transmitted signals is then determined and used to calculate the ship's three axes (fore-aft, athwartships and vertical) speed in a local vertical coordinate frame. The DSVL system is capable of accepting roll, pitch and heading inputs to compensate calculated speed for ship's angular rates. When the bottom is within the acoustic range of the DSVL system, the capability is also provided to manually select bottom reflections for true speed over the ground. Ship's speed is displayed on the equipment's front panel and can be supplied to end-users in 16-bit parallel and serial digital format. Ship's speed can also be supplied to end-users in analog format using 60 and 400 Hertz, 10, 40, and 100 knots/revolution synchro data.
The DSVL system is a three-unit system consisting of a Transducer (sensor), a Transmitter/Receiver (transceiver) Unit and an Electronics Control Unit. Primary system functions and controls are performed by the Electronics Control Unit utilizing digital signal processing and control techniques. The Electronics Control Unit will also incorporate Built-In Test Equipment (BITE) which will indicate DSVL system malfunctions by audible alarm. Signal conditioning of both the final output and initial input of the Doppler signal is performed in the Transceiver Unit. The Transducer, a flush mounted sensor, acts to interface the system functions with the water medium.
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