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Long-term studies of binary millisecond pulsars (MSPs) provide precise testsof strong-field gravity and can be used to measure neutron-star masses.PSR~J1909$-$3744, a binary MSP has been the subject of several pulsar timinganalyses. The edge-on orbit enables measurement of its mass using the Shapirodelay; however, there is degeneracy in the sense of the inclination angle, $i$,and multiple solutions for the longitude of ascending node, $\Omega$. Radiopulsars scintillate due to inhomogeneities in the ionized interstellar medium(IISM). This can result in scintillation arcs in the power spectrum of thedynamic spectrum that can use these to study the interstellar medium andconstrain binary pulsar orbits. Here, we study the scintillation ofPSR~J1909-3744 using observations from the 64-m Parkes Radio Telescope(Murriyang) over $\approx$13\, years, using techniques to study scintillationin a lower signal-to-noise regime. By monitoring annual and orbital variationsof the arc-curvature measurements we are able to characterise the velocity ofthe IISM. We find that the statistics of the IISM remained stationary over thistime and a slightly anisotropic model (axial ratio $\gtrsim1.2$) is preferred.We measure the relative distance to a single dominant thin scattering screen at$s=0.49\pm0.04$, or $D_s=590\pm50$\,pc, with an angle of anisotropy$\zeta=85\pm6^\circ$ (East of North) and velocity in the direction ofanisotropy $V_{\textrm{IISM}, \zeta}=14\pm10$\,km\,s$^{-1}$. By combining aphysical model of the IISM and current pulsar timing results, we also constrain$\Omega=225\pm3^\circ$ and $i=86.46\pm0.05^\circ$.

Analysis of the ionized interstellar medium and orbital dynamics of PSR~J1909-3744 using scintillation arcs