Subjective evaluations of noise from proposed aircraft and flight operations can be performed using simulated flyover noise. Such simulations typically involve three components: generation of source noise, propagation of that noise to a receiver on or near the ground, and reproduction of that sound in a subjective test environment. Previous work by the authors focused mainly on development of high-fidelity source noise synthesis techniques and sound reproduction methods while assuming a straight-line propagation path with standard atmospheric absorption and simple (plane-wave) ground reflection models. For aircraft community noise applications, this is usually sufficient because the aircraft are nearly overhead. However, when simulating noise sources at low elevation angles, the plane-wave assumption is no longer valid and must be replaced by a model that takes into account the reflection of spherical waves from a ground surface of finite impedance. Recent additions to the NASA Community Noise Test Environment (CNoTE) software suite have improved real-time simulation capabilities of ground-plane reflections for low incidence angles. The models are presented along with the resulting frequency response of the filters representing excess ground attenuation. Discussion includes an assessment of the performance and limitations of the filters in a real-time simulation.