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Finding the Boom: Phased array processing applied to sonic boom direction of arrival estimation

机译：找到繁荣：相控阵处理应用于Sonic Boom抵达估算方向

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From October 29,2012 to November 7,2012 73 supersonic passes of an F-18 aircraft were observed over a dry lake bed at Edwards Air Force Base as part of NASA's Farfield Investigation of No-boom Thresholds project, which was conceived to measure the characteristics of sonic booms at the boundaries of their decay, where overpressure is exceptionally low, thereby stretching the limits of current prediction methods. Each pass was recorded by a 55-microphone phased array sensor system with a circular aperture diameter of 2,000 feet (609.6 m). The data were processed using a novel time-domain array processing algorithm to estimate the direction of arrival and trace speed of the sonic boom wavefront along the plane of the phased array. The results from the phased array processing are consistent with the known location of the test aircraft for each processed flight and are consistent with expectations for direction of arrival due to atmospheric refraction. Near real-time estimation of the sonic boom direction of arrival, trace speed along the ground, and visualization of the propagation of the sonic boom wave front are possible. This could allow the test team to assess the data and determine if the target of the test point has been met while the test aircraft is still in flight This would enable improved test efficiency and efficacy, ultimately improving the value of the test campaign. The measured direction of arrival also provides sonic boom propagation numerical prediction code validation. Most sonic boom prediction codes provide the propagation path of the sonic boom and thus the direction of arrival of the sonic boom at a point on the ground. Thus for predictions made using the actual flight data measured at the time of the test, the predicted direction of arrival and measured direction of arrival can be directly compared to help validate the prediction codes.
机译：从29,2012 10 - 11月分别观察到在爱德华兹空军基地的干湖床7,2012 73的F-18飞机的超音速通行证作为无热潮阈值项目的NASA的远场调查，这被设想来测量的一部分在它们的衰变，其中过压是非常低的，由此拉伸的当前预测方法的限制的边界声震的特性。每个通用2,000英尺（609.6米）的圆形孔直径通过记录55麦克风相控阵传感器系统。该数据用一个新的时域阵列处理算法来估计沿所述相控阵的平面中的爆音的波前的到达和跟踪速度的方向进行处理。从相控阵的处理的结果与试验飞机对于每个处理飞行的已知位置相一致，并且与由于大气折射预期到达方向是一致的。近到达爆音方向的实时估计，跟踪速度沿着地面，和音爆波前的传播的可视化是可能的。这可以让测试团队评估数据，并确定是否在测试飞机仍然在飞行这将使提高测试效率和有效性，最终提高了测试活动的值的测试点的目标已经达到。到达测量方向还提供音爆传播数值预测代码验证。最爆音预测码提供的爆音的传播路径，因此爆音的到达在地面上的点的方向。因此，对于使用在试验中，到达的预测方向和到来的测量方向时测量的实际飞行数据作出的预测可以直接比较，以帮助验证所述预测代码。

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