jgg     2011 31 (4):  63-65    ISSN: 0412-1961  CN: 21-1139/TG DETECTION OF WEAK SUPERCONDUCTING GRAVIMETRIC SIGNALS WITH PRODUCT SPECTRUM OF WEIGHTED LSSA Yin Hui ;and Wang Yanyan School of Geodesy and Geomatics, Wuhan University, Wuhan 430079 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null