According to trigonometric function relations between output of attitude sensors and attitude parameters

an inverse trigonometric function circuit based on function generator is designed

to reduce computation error of analog inverse trigonometric and realize directly computation of attitude parameters. Tests on the designed circuit with discrete and continuous methods are realized

in discrete test analysis

multi-point fitting is adopted to process experimental data

and the average angle error is reduced to 0. 11° and the maximum angle error is reduced to 2. 87°; in continuous measurement

features of the input and output signals in time-domain and frequency-domain are analyzed

total harmonics distortion of output waveform is 8. 14 %. Experimental results show that the computation scheme is feasible

thus it can be used for analog computation of attitude parameters.