Formation of sonar channels by charge-coupled devices
AssigneeThomson-CSF
InventorsJoel Guyot, Jean-Louis Vernet
Life of this patent
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Abstract
Formation of channels for all-round passive sonar systems by the technique of charge-coupled devices. The shift register receives the multiplexed signals of the M transducers forming the listening base of the sonar system. The shift register has different series of sub-contacts, each series corresponding, at one moment, to the signal of one of the transducers. The adding of the weighted signals of one series gives an interpolated signal of the corresponding transducer. The such obtained delayed signals are weighted and added, such obtaining the preformed channels.
Claims7
A devide for forming channels for an all-round sonar system with an optimised reception pattern comprising:
- a plurality M of electroacoustic transducers forming a listening base of said sonar;
- means for sampling and multiplexing at a frequency F.sub.e the signals received by said M transducers to produce a multiplexed signal;
- a charge-coupled device (CCD) shift register having an input coupled to said sampling means for receiving therefrom said multiplexed signal and having N wherein N<M, series of outputs, each series having R subcontacts, said R subcontacts furnishing R delayed signals corresponding to one of the transducers;
- transversal filter means for weighting and adding said R delayed signals at said R subcontacts for each of said N series to form N signals;
- and
- means for filtering and adding said N signals and providing at the output thereof a signal indicative of the formed channel.
Dependencies are inferred from the claim text.