Kreiselkompass

摘要

A support base (26) of an angular velocity sensor (12) is supported rotatably at one end (28), and the support base (26) is vibrated by a piezoelectric element (30). By this vibration, a known rotational angular velocity is applied to the angular velocity sensor (12). For example, a difference of two output signals of the angular velocity sensor (12) is measured. This difference of the output signals is detected in synchronism with phases which differ from each other by 180 DEG , in two synchronous detection circuits (46,48). The detected signal is smoothed in smoothing circuits (50,54), and further, amplified in amplifying circuits (52,56). An output signal of the amplifying circuit is composed in a variable resistor (58) as a composite circuit. Meanwhile, from the output signal of the amplifying circuit, the output signal of the variable resistor and a signal corresponding to the known rotational angular velocity are subtracted.