Direction finding of pulsed signals from a towed pneumatic source by an antenna composed of vector-scalar modules

Resumo

The results of direction finding of broadband pulses from a pneumatic source, towed along an arc at a distance of 11 to 12 km, using spatial-diversity scalar detectors and vector-scalar modules are compared. The problem of direction finding based on power flux and according to a new method, using artificial vectors constructed from components of only vibration velocity vector, is solved. It is shown that, despite the complicated conditions for sound propagation, the error of direction finding using 100-m-aperture scalar detectors and single (point) vector-scalar detectors is almost the same and does not exceed 1 to 2°. The results of direction finding according to all algorithms are in good agreement. A method for suppressing noise from a local source by a four-component vector-scalar detector has been developed and investigated. A real possibility of increasing the signal-to-noise ratio on scalar detectors to 10−15 dB is established. Application of the developed suppression algorithm is found to increase noise immunity of the detection and direction finding.