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首页> 外文会议>AIAA/CEAS aeroacoustics conference >Finding the Boom: Phased array processing applied to sonic boom direction of arrival estimation
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Finding the Boom: Phased array processing applied to sonic boom direction of arrival estimation

机译：寻找动臂：相控阵处理应用于声波动臂的到达方向估计

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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：2012年10月29日至2012年11月7日，在美国爱德华兹空军基地的干燥湖床上观测到73架F-18飞机的超音速通行证，这是美国宇航局“无爆炸阈值”远场调查项目的一部分，该项目旨在测量声波喷杆在其衰变边界处的特征，其中超压极低，从而扩展了当前预测方法的局限性。每次通过是通过55麦克风相控阵传感器系统记录的，该系统的圆形孔径直径为2000英尺（609.6 m）。使用新颖的时域阵列处理算法对数据进行处理，以估计沿相控阵平面的声波波阵面的到达方向和走线速度。相控阵处理的结果与每次飞行过程中测试飞机的已知位置一致，并且与大气折射引起的到达方向的期望一致。可以近乎实时地估计声波臂的到达方向，沿地面的跟踪速度以及声波臂波阵面传播的可视化。这可以使测试团队评估数据并确定在测试飞机仍在飞行中时是否已达到测试点的目标。这将提高测试效率和功效，最终提高测试活动的价值。测得的到达方向还提供了声波传播数值预测代码验证。大多数声波臂预测代码提供了声波臂的传播路径，从而提供了声波臂在地面上某个点的到达方向。因此，对于使用测试时测得的实际飞行数据进行的预测，可以将预测的到达方向和测得的到达方向直接进行比较，以帮助验证预测代码。

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