Abstract: According to the fusion principle and accuracy of the coarse and fine channels of the inductosyn,an algorithm is designed and implemented.Using multiple fundamental wave superposition methods,the phase and amplitude of the basis function is automatically calculated in the algorithm.The fusion function is reduced,and the stability and margin of system fusion is improved.Using square wave as the basis,only adders instead of multipliers is used,FPGA applications can be quickly implemented,FPGA on-chip resources can be saved,as well as clock cycles when applied on other MCUs.

Key words: Inductosyn；Angle fusion, Square wave, Adder, FPGA