This paper proposes a novel absolute angle-measuring method with rotary inductosyn to meet the requirements of high-precision and absolute angle measurement. Besides, a feasible system based on the method is presented and the simulation verification is also provided. This method takes advantage of a 720-poles' rotary inductosyn and a 718-poles' rotary inductosyn to obtain a high precise absolute angle firstly and then utilizes a higher precise relative angle value of 720- poles' inductosyn to achieve angle coupling. This method has many appealing characteristics, such as absolute angle measuring, high-precision, small size, high reliability and anti-seismic, etc. The principle equations and coupling algorithm of this method are deduced and the results of simulation are given in this paper as well.
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