The Effect of Signal/Noise Ratio and Bandwidth on Vehicle Identification, Using the Acoustic Sensor.
Technical paper May-Oct 77,
HRB-SINGER INC STATE COLLEGE PA
Pagination or Media Count:
Three experiments were conducted to determine the effect of variations in signal-to noise SN ratio and increases bandwidth on the ability of remotely monitored operators using the acoutic sensor to identify vehicles in convoy. In general, the operator was to discriminate between the following seven military vehicles traveling in typical convoys jeeps, gamma goats, 2-12-ton trucks, 5-ton trucks, 10-ton trucks, armored personnel carriers, and tanks. Targets were presented at each of four levels of SN ratio 6 decibels dB, 12 dB, 18 dB, and 24 dB. The operational bandwidth of 50-2000 hertz Hz was compared to that of 50-4500 Hz. Special training under all of the above conditions was given. The results indicate that operator identification completeness declines as the SN ratio decreases approximately 1 per 1.5 dB of SN ratio. No differences were found in use of the two bandwidths. Use of automatic gain control should be limited because the operator uses loudness variations to discriminate among targets. Author
- Acoustic Detection and Detectors
- Human Factors Engineering and Man Machine Systems