Modular acoustic platform to develop underwater bidirectional tags

19 ins umen a ion iewpOin - 21 - MARTECH 23 ID07 MODULAR ACOUSTIC PLATFORM TO DEVELOP UNDERWATER BIDIRECTIONAL TAGS G. Ba e 15, D. Sa ià16, M. Nogue as17, S. Goma iz18, J. del Rio19, I. Masmi ja20 ABSTRACT Minia u ised acous ic ags a e key o conduc ing spa ial beha iou s udies on ma ine o ganisms (e.g., No wegian Lobs e ). None he- less, he cu en echnology has i s limi a ions, speci ically in ac- qui ing high- esolu ion 3D mo emen s. Enginee ing and de elop- ing new bidi ec ional acous ic ags will help imp o e he acking and moni o ing capabili ies o he agged species. To accomplish his miles one, a es bed needs o be es ablished o alida e and i e a e o e e e y ag’s sys em. In his pape , he cons uc ion and capabili ies o he i s es bed’s keys one ool a e p esen ed, and esul s om labo a o y and ield es s a e discussed. Keywo ds – Acous ic, Tags, Minia u ized, T acking, Mod- ula i y. INTRODUCTION The de elopmen o a bidi ec ional acous ic ag implies a signi - ican ad ancemen in he ield o ish and unde wa e species acking and moni o ing (e.g., Single base anscei e poin ange calcula ion), imp o ing knowledge on he mo emen s and spa ial beha iou s o hese o ganisms, and hus helping be e p o ec hem om o e ishing and ano he human-caused endange - men . This wo k aims o p o ide a highly modula and lexible pla o m o de elop and implemen new communica ion algo- i hms and p o ocols. Addi ionally, he pla o m has he capabil- i y o be connec ed and con igu ed emo ely, which allows us o connec i o he OBSEA unde wa e cabled obse a o y [1]. This s udy is a con inua ion o he i s design and p oo o concep p esen ed p e iously [2]. THE PLATFORM ELECTRONICS This i s encapsula ed e sion consis s o a basic unc ioning acous ic ansmi e wi h ep og ammable i mwa e. This ollows he p ocess low diag am shown in Fig.1, wi h h ee main blocks: (A) communica ions and powe supply; (B) da a p ocessing and I/O; and (C) signal condi ioning, ampli ica ion wi h a ce amic piezo- elec ic elemen uned a 69 kHz. COMUNICATION PROTOCOL AND FUNCTIONING Fo communica ions and powe supply, a plug-and-play module has been designed based on he Lan onixⓇ Xpo Ⓡ and a Di ec Cu en (DC) powe supply con e e (DC o DC) isola ed b ick om T acoPowe (model TEL 8-1210), swi ching he 9-18 V om he base s a ion o he 3.3 V used in he ag’s sys ems. A cus om communica ion commands p o ocol o e E he ne has been im- plemen ed, his enables emo e au oma ion, con ol, and con ig- u a ion wi h he LabVIEW applica ion designed. Communica ion is di ided in o wo phases. Fi s , a e powe ing on he sys em, he mic ocon olle expec s, du ing 30 seconds, a go o no-go om he use o launch a ailo -made speci ic boo loade , o new i m- wa e uploading. And i hose 30 seconds ha e passed, he second phase s a s wi h he ou ine p og am loading p e-se alues and wai s o a s a command o begin a con inuous 69 kHz emission. I necessa y, he use can con igu e, ia es ablished commands, one o he o he modes. The h ee modes a ailable in he cu en i mwa e e sion a e he ollowing: (i) Con inuous Emi ing Mode a a gi en F equency; (ii) Single Sho wi h a use -choice numbe o pulses (e.g., 50 pulses a 69 kHz wi h a 3/3 powe le el); and (iii) Pulse Posi ion Modula ion (PPM) wi h con igu able pulses and s op ime. Fig.1.Sys ems’ P ocess Flow Diag am. Th ee main blocks: A) Communica ion and Powe , B) Mic ocon olle and C) Piezoelec ic elemen and i ’s d i e 20 ins umen a ion iewpOin - 21 - MARTECH 23 ASSEMBLY AND ENCAPSULATION The boa d con aining all h ee blocks has been assembled in a longi udinal s ick o m ac o , his acili a es he encapsula ing p ocess. The elec onics a e connec ed o Subconn (McCa - ney Unde wa e Technology G oup, Denma k) connec o cable h ough a wi e o an E he ne connec o (see Fig 2.). A igid plas ic ma e ial s ip is added on bo h sides o educe bending and o - sion ac ions, an epoxy-based esin is pou ed in hea sh ink ub- ing, se ing as a mould and inal ou e mechanical p o ec ion. The piezoelec ic elemen has i s own encapsula ion in a mo e igid esin o enhance acous ic pe o mance [3]. RESULTS The es s done in he Labo a o i d’Aplicacions Bioacús iques (LAB) esea ch g oup pool acili y om he Uni e si a Poli ècnica de Ca alunya (UPC) e ealed a ansmi ing powe o 145 dB e 1 uPa a 3/3 powe d i e le el. This es also alida es he ope abili y o ha ing a boo loade o change he i mwa e. Field es s ega ding ange ha e been conduc ed in he OBSEA’s egion a 4 km o he Vilano a i la Gel ú coas . Up o 220 m he signal could be ecei ed by a comme cial uni and 340 m wi h he ins alled Hyd ophone on he obse a o y a he sea loo (Fig. 2 Showing he las 255 m app oxima ion o he hyd ophone posi ion). CONCLUSIONS This newly de eloped pla o m se ed as a baseline o es he i s capabili ies o he ansmi ing sys em composed o he piezoelec ic and he d i e , his is he i s s ep in de eloping a majo es bed sys em o es he designs and new sys ems o de- elop a bidi ec ional acous ic ag. ACKNOWLEDGEMENTS This wo k ecei ed inancial suppo om di e en esea ch p ojec s o he Spanish Minis e io de Economía y Compe i i idad (SASES: RTI2018- 095112-B-I00 and BITER: PID2020-114732RB-C32) and Gene ali a de Ca alunya’s “SARTI-MAR” 2017 SGR 371. IM e- cei ed inancial suppo om he Eu opean Union’s Ho izon 2020 esea ch and inno a ion p og amme unde he Ma ie Skłodows- ka-Cu ie, g an ag eemen No 893089. GB ecei ed he suppo o Sec e a ia d’Uni e si a s i Rece ca del Depa amen d’Emp esa i Coneixemen de la Gene ali a de Ca alunya. Fig 2. (A) The Sys em ully encapsula ed and (B) he i s emi ing es spec og am wi h he a ying ange om he ag o he OBSEA’s Hyd ophone (Bjo ge ASA NAXYS-E he ne -02345) REFERENCES [1] Del-Rio, J., Nogue as, M., Toma, D. M., Ma inez, E., A e o-Delgado, C., Bghiel, I., ... & Làza o, A. M. (2020). Obsea: a decadal balance o a cabled obse a o y deploymen . IEEE Access, 8, 33163-33177. [2] Masmi ja, I., Co egido , D., López, J. M., Ma inez, E., Na a o, J., & Goma iz, S. (2021, May). Minia u ised bidi ec ional acous ic ag o enhance ma ine animal acking s udies. In 2021 IEEE In e na ional Ins umen a ion and Measu emen Technology Con e ence (I2MTC) (pp. 1-6). IEEE. [3] Sa ia, D. (2014). Sis emas inalámb icos pa a la moni o ización con inua del compo amien o de especies ma inas.