jgg     2007 27 (专刊):  98-100    ISSN: 0412-1961  CN: 21-1139/TG OPERATING PRINCIPLE AND ERROR SOURCE OF A NEW TYPE OF CCD PHOTOELECTRIC AUTOCOLLIMATOR Ou Tonggeng 1,2) ;Chen Zhigao 1,2) ;Yang Boxiong 1,2) ; and Fu huiqing 1,2) 1)Institute of Seismology,CEA, Wuhan 4300712)Crustal Movement Laboralory,Wuhan 430071 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null