激光环到光纤陀螺的技术演变过程_图文.doc

nonlinearity in FOGs is reduced by isolating the sensing coil from these disturbances and by special coil winding techniques and careful thermal design. In spite of these difficulties, FOGs have emerged as viable rate sensors for the low to medium performance ranges. For many applications, FOGs offer a solid state, low cost, highly reliable, lightweight alternative requiring low power, and no warm up time. Additionally, FOGs are capable of great flexibility in geometry and packaging [12]. Technology Comparisons All optical gyroscopes operate by sensing and measuring the Sagnac frequency shifts induced by rotation. The means by which this is accomplished are vastly different and determine the performance, cost, design constraints, and appropriate areas of application for each type. Table 1 illustrates typical gyroscope applications and associated performance requirements. Table 1.Gyroscope applications and associated performance requirements Full Scale (deg/sec 100 10-30 10 400 Scale Factor Stability (ppm 25 50 ~ Type Aircraft Navigation Space Booster Air-To-Ground Spacecraft Torpedo Air-To-Ground Tactical Missile Terminal Aided Radar Guided Ground-To-Air Missile Cannon Launched Bias Stability (deg/hr 0.01 0.1 0.1-0.001 10-100 Warm up Time (sec >300 >300 >300 _______ Cost Size Life (yr >1 >1 >1 3-5 High Medium High Low Not Critical Not Critical Med-Small Med-Small 50 100-500 100-200 500 0.1 60 Very Low Small 3-5 200-500 >500 >1,000 _______ 10-50 _______ 1/4-10 _______ Low-Med Very Low Very Low Small Small Critically Small 5-10 _______ Pave Penny 40 10,000 Approx. 1,000 30 2,000 hrs As demonstrated in Table 1, Pave Penny requirements are rather undemanding in terms of bias stability and scale factor stability. Performance Comparisons Ring laser gyros and mechanical devices continue to dominate the high performance markets, bias stability of 0.01 degrees per hour or better, which currently remain out of reach for fiber optic gyros. This, however, leaves a very wide r