System for providing improved reverberation limited sonar perfor

Details System for providing improved reverberation limited sonar perfor System for providing improved reverberation limited sonar perfor

1984-10-01

1991-03-05

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367101, G01S 1500

Patent

active

049982249

ABSTRACT:
Apparatus and method for providing increased gains in detection and classcation of active sonar targets while concurrently preventing target cognizance of detection. Operation starts with transmission of a sequence of FM slides as subpulses alternately up slide, down slide, up slide, etc., while varying randomly the start frequency of each. Subpulse lengths short enough to avoid overlap of echoes from multiple major reflectors are used. Each slide is started at a randomized frequency. Just enough bandwidth is used on each slide to achieve the range resolution desired for searching. Considering only the individual subpulse bandwidth, subpulses are transmitted throughout the systems total bandwidth. Enough subpulses are transmitted to achieve the bandwidth/time product desired for searching.

REFERENCES:
patent: 3519985 (1970-07-01), Page
patent: 4047172 (1977-09-01), Bauer et al.

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