Insights into binary pulsar dynamics through studies of the ionized interstellar medium

<p dir="ltr">This thesis investigates pulsar timing and scintillation to study the ionised interstellar medium and pulsar orbital kinematics. Observations were conducted with two major Southern Hemisphere radio telescopes: Murriyang in Australia and MeerKAT in South Africa. Refined kinematic measurements were obtained for PSR J1909-3744, crucial for pulsar timing arrays, and for PSR J0737-3039, the only known double pulsar system essential for testing general relativity. Additionally, the mass of PSR J1757-5322 was constrained using combined scintillation and timing techniques. Collectively, these results demonstrate novel scientific and statistical methods for probing the ionised interstellar medium and advancing pulsar timing science.</p>