The paper reports on near and far-field acoustic measurements of single and dual supersonic exhaust jets impinging normal to a simulated ground plane. Far-field measurements focus on investigating the differences in noise with standoff distance, total temperature ratio, and the operation of a single supersonic jet compared to a forward sonic jet and rear supersonic jet. Overall sound pressure level (OASPL) directivity shows peak noise levels directed towards the rear arc. Near-field spectra for convectively supersonic jets appear nearly flat over a wide range of frequencies as acoustic pressure fluctuations are of similar magnitude to hydrodynamic pressure fluctuations. Unsteady surface pressure measurements at the impingement points of the forward and rear jets show a peak in rms pressure near a standoff distance of 6-8 nozzle diameters. Flow visualization show large scale structures impinging on the ground plane with strong acoustic waves radiating from the point of impact. Surface pressure and the near-field microphone signals are cross-correlated with far-field microphone signals to investigate the propagation paths of noise generated by large scale structures to the far-field.