ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Airspeed measurement method based on propagation time estimation of acoustic waves
Received date: 2014-04-16
Revised date: 2014-09-05
Online published: 2014-09-10
Supported by
National Natural Science Foundation of China (61172126);Natural Science Foundation of Jilin Province (20140101073JC)
A novel airspeed measuring method based on acoustic sensors, applying to both subsonic and supersonic circumstances, is presented. Firstly,according to the propagation property of acoustic waves in subsonic and supersonic air current, the relationship between propagation time of acoustic waves and airflow velocity is derived for a given measuring equipment. Then, based on that, a timing method and a maximum likelihood estimation (MLE) algorithm are proposed to estimate the traveling time of acoustic waves. The timing method gains an advantage over the MLE algorithm in real-time, while the MLE algorithm is more reliable than the former. Finally, the performance of the proposed algorithms are verified by simulations and analyzed in terms of the perturbation of sensor position, the airspeed estimation error caused by timing error and the Cramér-Rao bound (CRB) on the estimation error of propagation time. The results show that the proposed algorithms are able to measure subsonic and supersonic airspeed with high accuracy.
YU Fei , TAO Jianwu , QIAN Lilin . Airspeed measurement method based on propagation time estimation of acoustic waves[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(4) : 1285 -1298 . DOI: 10.7527/S1000-6893.2014.0204
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