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Jon, I am planning well ahead here... This is something that may be attempted at a later date... If ever a trainable array were to be found on say an ambient I am planned on building, I would like the ability to look up slightly should I approach a surface boat and find the need to look up slightly so as to better understand it's position. It is not a requirement that this array do so. Likewise if mounted on a support vessel, it would be nice to look slightly down to better get a feel of the submarines position should the depth separation of the two vessels be great. The isolating of this front surface was something researched when hydrophone selection was still being looked into (The HSU). Although not shown in Jen's plots, I am sure the back lobe showing on his charts would be reduced but not completely removed. In the original binaural array, it is said that two possible locations to a detected contact existed and that only when array facing is changed can one be eliminated the ghost or false detection . This same "mirror" or ghost bearing happens in more modernized towed arrays and a course change was required to remove the extra possibility as these were conical beam patterns. David Bartsch Date: Wed, 1 Dec 2010 10:52:55 -0500 From: jonw@psubs.org To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] passive sonar Are elevation changes necessary? Does isolating direction in the manner you have achieved it change the forward beam of the receiving piezo? Jon On 12/1/2010 3:15 AM, David Bartsch wrote: To all: |