The invention relates to a coordinate
dynamic positioning and navigation method based on
point source displacement disturbance, and belongs to the field of operation positioning and navigation.The method comprises the steps that S1, in the current field minimally invasive operation process, an operation probe is regarded as a point
current source in a field domain,
constant current with the constant amplitude and frequency is injected into a conducting medium, a stable and
constant current field is established in the field domain, and a current field is established; acquiring the boundary
potential difference of each
observation point before and after the probe moves; s2, constructing a Poisson equation; s3, determining boundary conditions; s4, constructing a
mirror image source, calculating the coordinates of the
mirror image source, and determining the size and polarity of the
mirror image source; s5, superimposing the influence of the current outflow point; s6, arranging a total potential
analytic expression; s7, deriving the coordinates, and solving a relational expression between
point source coordinate disturbance and boundary
potential change; and S8, substituting the boundary
potential difference acquired by each
observation point into the relational expression, calculating the displacement disturbance variation on the basis of the previous coordinate, and calculating the coordinate of the next positioning after the infinitesimal displacement disturbance of the source point according to the displacement disturbance variation.