Single-axis infrared attitude measurement system has dead zone when using in SUAV. Through adding another pair of IR sensor which vertical to original axis can compensate the dead zone. There must be a pair of IR sensor in the measurable area

and through measuring output temperature difference of objective axis to decide which axis is in measurable area and then to calculate the attitude angle of objective axis. Use digital IR thermopile design and realize the attitude angle measurement module without dead zone in 180° at first time

and through testing

the static state error of system is less than 2°.