Lock-In Amplifier Technology in Laser Gyroscope North Finder of Constant Rate Biasing

Table 1

The truth value table of the heading angle 𝜓.

cos𝜓	sin𝜓	Heading angle 𝜓
+	+	𝜓main
−	+	𝜓main+180^∘
−	−	𝜓main+180^∘
+	−	𝜓main+360^∘
1	0	0^∘
0	1	90^∘
−1	0	180^∘
0	−1	270^∘