Багатопроменевий профілограф

US005515337A United States Patent m [111 Patent Nmnber: Gilmour et al. [45] Date of Patent: [54] [75] MULTIBEAM 8ШЕ-ЬО0К SONAR SYSTEM GRATING SIDE LOBE REDUCTION TECHNIQUE 5,177,710 Filed; [51] [52] [58] Int. Cl.^ U.S. CI Field of Search Apr. 20,1995 GOIS 15/89 ЗЙ7/88; 367/905 367/88, 905, 105 References Cited [56] U.S. PATENT DOCUMENTS 4,802,148 4,987,563 5,033,029 ]/!989 Gilraour 1/1991 Gilmour 7/1991 Jones 367/88 ABSTRACT A multibeam side-Iook sonar system includes a projecting transducer that projects a beam of acoustic energy to insonify a target area and a receiving transducer having a plurality of transducer elements arranged in a linear array. Each of the transducer elements generates a beam signal in response to acoustic energy reflected from the target area. A beamforming circuit, coupled to the receiving transducer, processes the beam signals g e u ^ t e d py tiie transducer elements to form a_beam pattern. The beampatlehi fojja^ ^ ^ Д ^ enc^ )^e^ on the receiving transducer has a main lobe" antf A ^ ^ grating side lobes. One of the grating side lobes may be ansonified by the projected beam of acoustic energy. A shading circuit, coupled between the receiving transducer and the bearaforming circuit, amplilies the beam signals with respective gains, and adjusts each of the respective gains to reduce an amplitude level of the grating side lobe insonified by the projected beam of acoustic energy. Appl. No.: 425^50 [22] 1/1993 Gilmour etal [57] Assignee: Westinghouse Electric Corporation, Pittsburgh, Pa. [21] May 7, 1996 Primary Examiner—Darnel T. PihuUc Inventors: George A. Gilmour, Severna Park; James L. Meyers; Leslie M. James, both of Baltimore, all of Md. [73] 5,515,337 367/S8 367/88 367/88 9 Claims^ 10 Drawing Sheets >^( Ua 14b 1_ 1. 14 14c I4d I4e A 14f Ug L 14h 14І 14І 14k 3Sa| 38a T V 38b 38c I 3b B V 36c rn 3ad SHADING CONTROL CIRCUIT 36e 38e 36f 38f 38g V 58h 381 38] 36h 36І 36} ^ ^ 3Slc 56k 361' 381 52 34Q 54b 54c 54d 34e 54f 30 42Q Ш 42b> He­ m- 42e 42f 34Q ; 34h Си и 34І 429-^42h- 42І BEAMFORMING CIRCUIT 'b 34k U Щ- 42k~ 341 421 _/} U.S. Patent May 7,1996 Sheet 1 of 10 5,515,337 У , - X FIG. 1 U.S. Patent May 7,1996 14a Ub 36a ^ 58Q 38b ^ 38c 14c 14d I4e Uf 1-q 14h 14i 141 36c 36d Зе б 18^ 58f 38g 36f ^ 36h 38h 36) ^ 36( ^ Щ Ш 36k ^ ^ 581 32 U k 141 56b m SHADING CONTROL CIRCUII 5,515,337 Sheet 2 of 10 34o 54b 30 42a^ 42b 3 c 34d 4 54e 34f v_] 42c- 42d^ 42e 42f 349 34h v^ v^ 42g--42fb- 42i 40BEAMrORMlNG CIRCUIT 20 FIG. 2 34І V. 'b 42І 34k m і 5?': 31 4 421 U.S. Patent UQ May 7,1996 Ub 14c Ud 14e 5,515,337 Sheet 3 of 10 Uf 14g FIG. Uh 3 Ui Uj Uk Ml U.S. Patent May 7,1996 Sheet 4 of 10 5,515,337 50% I 80% 1100% і 80% ! 50% На Ub Uc Ud Ue Uf FIG. 4 I U.S. Patent May 7, 1996 5,515,337 Sheet 5 of 10 SLS BEAM PATTERN ЛПЧЖКПГ -200 100 0 100 POSITION (WAVE LENGTHS) FIG. 5A 200 300 U.S. Patent May 7,1996 50d Sheet 6 of 10 SLS BEAM PATTERK -100 0 100 POSITION (WAVE LENGTHS) FIG. 5B 5,515,337 U.S. Patent May 7, 1996 Sheet 7 of 10 50% I 80% 1100%! 80% I 50% I 1 1 1 1 1 Ш Ub Uc Ud Ue Uf FIG. 6 5,515,337 U.S. Patent May 7,1996 ]t,