According to the characteristics of in stall ation and three-axes gimbal for sustaining payload of UAV airborne turret,this paper proposes a novel method that can be used for measuring relative attitude between inner payload and outer frame of airborne photoelectric turret with high precision sensor on eccentricity.First of all,the mathematical model for angular translation measuring is established,and at the same time,nearly linear relation between distance and ang le is produced based on eccentricity.Second,considering the characteristics of relative movement between payload and outer frame of airb orne turret,a reasonable method with unique eccentricity design is proposed for measuring angular translation both on pitch and yaw.In addition,the systemic error caused by radical ranout is eliminated by both bi-eccentric-sphere and multiple standalone capacitive sens ors.Finally,simulation and several experiments are conducted to verify the propo sed method with extraordinarily precise standalone capacitive sensors.Both the analysis and experimental results reveal that this proposed method can achieve angular measurement as precise as 15″ with maximum bandwidth of 1.24kHz.This designed measurement apparatus can satisfy the rigorous demand of relative attitude measurement between inner payl oad and outer frame of novel airborne photoelectric platform.