2. Historical Background Flashcards
What is a Magnetic Anomaly Detector
Instrument used to detect variations in Earths magnetic field IOT detect submarines.
What is a DICASS Sonobuoy?
Directional Command Activated Sonobuoy System
Aircraft can trigger pings via radio link. Buoy returns bearing and range data.
Draw the Active Sonar Block Diagram
Active Sonar: Trigger
Ensures the system is synchronized
Active Sonar: Beamformer
Transducer Arrays are not tuned mechanically. Instead, beamformer steers the transmit beam in the desired direction as well as listen form the desired direction.
Active Sonar: Transmitter
Generates proper waveform (FM or CW) at the rpoper frequency and at the proper power level.
Active Sonar: T/R Switch
Isolates receiver from high power pulses.
Active Sonar: Transducer Array
Made up of 360 single element transducers (SET). The same transducers are used to transmit and receive.
Active Sonar: Receiver/Signal Processor
Detects echo and estimates range, bearing, and doppler. Removes noise.
Active Sonar: Data Manager
Stores all data available for display and replay. Perofrms automatic tracking of targets and Target Motion Analysis.
Active Sonar: Display
Displays acoustic and non-acoustic information. System controls to optimize system performance.
___ Pulses give better detection.
Longer.
____ determines the power transmitted.
Amplitude
What is the advantage of CW SONAR?
Good Doppler
Bad Range Resolution.
Advantage of FM SONAR
Good Range Resolution
Bad Doppler
