Challenge of monitoring cohesive movement in homing fish using fine-scale 3D positioning

Takagi, Junichi; Ichikawa, Katsuhiko; Arai, Nobuaki; Shoji, Jun; Mitamura, Hiromichi

doi:10.3354/ab00739

Cited by 4 publications

(1 citation statement)

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“…In positioning biotelemetry, fine-scale positioning of <1 m order will be one trend to observe inter-individual or inter-specific interactions between animals (e.g. [ 12 , 24 ]). Positioning results are geometrically dependent upon coordinates of the receivers, including installation depth, and are particularly sensitive in the vicinity of the receiver because of the shape of a hyperbola or hyperboloid.…”

Section: Discussionmentioning

confidence: 99%

A simple intuitive method for seeking intersections of hyperbolas for acoustic positioning biotelemetry

Takagi

Kanazawa²,

Ichikawa³

et al. 2022

PLoS ONE

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We proposed a simple hyperbolic positioning method that does not require solving simultaneous quadratic equations. Moreover, we introduced the mathematical concept of a “pencil” into analytical calculations in the hyperbolic positioning method for a better understanding. In many recent studies using positioning biotelemetry, the specific procedure for intersection calculation of hyperbolas has rarely been described. This might be one of two major obstacles, with the other being clock synchronisation among receivers, for positioning biotelemetry users, including potential users. We focus only on the intersection calculation in this paper. Therefore, we propose a novel method and introduce the mathematical concept into analytical calculations. The computing performances of the novel method, an analytical method applying the concept of a pencil, and an approximating method using the Newton-Raphson method were compared regarding positioning correctness, accuracy, and calculation speed. In the novel method, hyperbolas were represented using the parameter θ, which was treated as a discrete variant. The finer the tick-width of the parameter θ, the more accurate was its positioning, but it took slightly longer to calculate. By setting the tick-width to 0.01°, a simulated trajectory was correctly and accurately localised, as in the analytical method which always correctly returned the accurate solution. The approximating method has a major limitation concerning correctness. It returns a single solution regardless of two intersections of hyperbolas; however, the positioning is accurate when the hyperbolas intersect at a single point. This study approached one major difficulty in positioning biotelemetry and will help biotelemetry users overcome this drawback with a simple and intuitive understanding of hyperbolic positioning.

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Section: Discussionmentioning

confidence: 99%