AUTHOR=Niu Longlong , Zhou Chen , Wei Na , Deng Zhong-Xin , Ning Yun , Chen Rong , Liu Wen TITLE=A study of O/X wave data assimilation and inversion for ionospheric vertical electron density profiles JOURNAL=Frontiers in Astronomy and Space Sciences VOLUME=Volume 12 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2025.1510602 DOI=10.3389/fspas.2025.1510602 ISSN=2296-987X