Improvement in the fractional error of orbital period decay, Ṗ_b, and $\dot{\omega }$ based on the simulations described in Sect. 4. The improvement in detection significance of the orbital period derivative (Ṗ_b) is shown in purple and the relative advance of periastron ($\dot{\omega }$) is shown in light blue. The vertical lines show the different simulated data; MeerKAT, MeerKAT+, and SKA 1-mid and the horizontal grey dashed lines show the significance thresholds.