Study On Digitization And Automation Key Technique Of Gyroscope

Due to high precision of orientation, high adaptation in all the weathers, independent measuring at any time and location, gyroscope has been widely used as one of the major instruments for orientation in such fields as military affairs, mapping, mine exploitation, and so on. Because the traditional gyroscopes are manipulated mainly by manpower with a low automation, it can not meet the requirements of the modern technology. Newly full automatic gyroscopes are monopolized by developed countries. Based on the modern technology, in combination with the modern sensor technique, digital signal processing technology as well as the automatic controlling technology, JT-15 gyroscope is adopted as the experimental pattern to explore and implement the key technology of its digitization and full automation and make a foundation for the fully automatic gyroscopes.Digital measuring system of gyroscope is established, and digitization and automation of collecting cursor and north-finding are realized, so it makes convenience for the research of north-finding arithmetic. Automatic coarse north-finding system of the gyroscope is designed and its automation is achieved by fuzzy control arithmetic. Based on the digital measuring system, Real-time transit method and integral north-finding arithmetic are studied; furthermore, a scheme of fully automatic north-finding combining coarse north-finding by magnetic sensor with precise north-finding by gyroscope is proposed. A set of full automatic experiment equipment is produced to confirm the rationality of the scheme.The hardware and software systems for data acquiring and processing of the digital signal during the movement of gyroscope are established. After the magnification, A/D transformation of the cursor signal acquired by CCD, the signal is processed by DSP processor to find north, so the digitization of the gyroscope is achieved.The turntable system is designed, and the rotating speed has been fractionized by virtue of speed-decreasing system. A closed-loop control system is formed involving the DSP processor, step motor driver, step motor and electronic compass. The angle between the collimating position of the gyroscope is exported from the electronic compass and true north as the feedback signal to be processed by DSP, and the fuzzy control arithmetic is adopted for control the movement of the step motor to achieve the coarse north-finding automatically. The technology has been applied for a patent and is in checkup phase by far (applying number: 200610014751).Based on the movement close to the sinusoid and the traditional transit method of gyroscope, the real-time transit method is presented which could start to find north while cursor is in any position. The real-time transit reduces the measuring time distinctly and preserves the measurement precision synchronously. The whole movement of gyroscope acquired by CCD signal acquiring system is used to deduce the basic theory and expressions,so the study on north-finding arithmetic of integral method and the its application in digitization of north-finding is completed.Gyroscope digital measuring subsystem, sensitive components automatic rising and lowing subsystem, automatic coarse north-finding controlling subsystem controlled by DSP and CPLD, combined with full automation north-finding scheme, make up of the whole-automation intelligent north-finding experimental system. JT-15 gyroscope is adopted as the experimental pattern, when the north-finding time is 15min, the north-finding precision is 8″, and when the north-finding time is 5min, the north-finding precision is 25″. The experiment results confirm the feasibility and rationality of the scheme.