Abstract
The SuperDARN HF radars can be used for meteor observation and inversion of mid-upper atmosphere neutral wind using observed meteor echo Doppler velocities. Aiming at the problem that the extraction of meteor echo based on echo power, Doppler velocity and spectral width is rough and contains ionospheric echo, this paper optimizes the extraction algorithm of meteor echo. Based on the AgileDARN HF radar’s digital characteristics, the observation method of meteor echo was improved, and we designed a meteor observation mode without changing the hardware system: using a meteor observation with a 7.5 km range resolution and a 2 s integration time, we extracted the Doppler characteristics of different echo types at meteor echo ranges; according to these features, the extraction algorithm of meteor echo was optimized. By analyzing the measured data, the characteristics of diurnal variation, power distribution, Doppler velocity distribution and spectral width distribution of meteor echo extracted by the optimization algorithm were obtained. The meteor echo characteristics obtained by the improved algorithm are more consistent with the theoretical analysis; thus, the improved algorithm is better than the SuperDARN high frequency radar meteor echo extraction algorithm and has good performance. The meteor echo extraction algorithm presented in this paper can extract the meteor echo more accurately, so that the atmospheric neutral wind can be retrieved more accurately. At the same time, the proposed algorithm is not only applicable to AgileDARN HF radar meteor observation mode data, but also to AgileDARN and SuperDARN normal mode data, which is beneficial to expand the data application of SuperDARN radars.
Highlights
A large number of meteoroids enter the Earth’s atmosphere every day [1], and the meteoroids interact with the atmosphere to form ionized trails, called meteor trails; radar emitted signals encounter the meteor trails and produce reflected signals, which are received by the radar to form meteor echoes
Very high frequency (VHF) meteor radar is a type of special equipment used for meteor observation, which can invert the neutral wind in the middle and upper atmosphere through the observed meteor echoes [3]
The method of extracting meteor echo based on echo power, Doppler velocity, spectral width and phase fitting root mean square error is invalid
Summary
A large number of meteoroids enter the Earth’s atmosphere every day [1], and the meteoroids interact with the atmosphere to form ionized trails, called meteor trails; radar emitted signals encounter the meteor trails and produce reflected signals, which are received by the radar to form meteor echoes. The second method requires the modification of the SuperDARN radar system, its resolution is low, and it requires the analysis of the raw time series of the received signal; the data processing process is more complex, and the operation is more complex. In view of the problems of the above methods, based on the AgileDARN highfrequency radar system, the meteor observation method was designed on the premise of not changing the hardware system This method improves the range resolution and time resolution, and obtains the meteor echo more accurately. Based on the observation data of the meteor observation mode, this paper improves the extraction algorithm of meteor echo.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
