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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.