Holographic reconstructions of the sound field in the vicinity of a tied-down F-35 aircraft were achieved by applying multisource statistically optimized near-field acoustical holography to measurements taken at a linear ground array approximately parallel to the shear layer of the jet. The measured field, as well as reconstructions to locations where the field was not measured, show that the field can be described as a superposition of multiple lobes in the spatiospectral domain. These lobes are observed in the field when the aircraft is operated at a variety of engine powers, including afterburner. For a given engine power, as frequency is increased, the spatial lobes in the mixing-noise region shift aft in directivity until they disappear beyond the aperture of the measurement while new ones appear toward the sideline and shift aft with the others. At a fixed frequency, when engine power is increased, the forward-most spatial lobe increases in level more than the other lobes, which is a major factor in the observed forward shift in overall directivity with increasing engine power. Frequency-dependent raytracing of the spatial lobes gives insight into the directivity and apparent source locations for jet noise components as a function of frequency and engine power.

通过将多源统计优化近场声全息术应用于近似平行于喷气机剪切层的线性地面阵列进行的测量，实现了 F-35 飞机附近声场的全息重建。测量的场以及未测量场的位置的重建表明，该场可以描述为空间光谱域中多个瓣的叠加。当飞机以各种发动机功率（包括加力燃烧室）运行时，可以在现场观察到这些波瓣。对于给定的发动机功率，随着频率的增加，混合噪声区域中的空间波瓣在方向性上向后移动，直到它们消失在测量孔径之外，而新的空间波瓣出现在边线上并与其他波瓣一起向后移动。在固定频率下，当发动机功率增加时，最前面的空间波瓣比其他波瓣的电平增加更多，这是观察到的整体方向性随发动机功率增加而向前偏移的主要因素。空间波瓣的与频率相关的射线追踪可以深入了解作为频率和发动机功率函数的喷气噪声分量的方向性和视源位置。这是观察到的整体方向性随着发动机功率增加而向前移动的主要因素。空间波瓣的与频率相关的射线追踪可以深入了解作为频率和发动机功率函数的喷气噪声分量的方向性和视源位置。这是观察到的整体方向性随着发动机功率增加而向前移动的主要因素。空间波瓣的与频率相关的射线追踪可以深入了解作为频率和发动机功率函数的喷气噪声分量的方向性和视源位置。