Update 90 - A progress report on evaluation and flight testing of the small common RLG INS

The Honeywell Small Common Inertial Navigation System (SCINS) was introduced in October 1989. Since then, significant land vehicle and aircraft flighttests have been conducted. Test results show the performance can be improved to less than 1.0 nmihr CEP. Velocity and anitude errors also show significant reductions. SCINS can provide attitude reference, navigation, weapon initialization, sensor stabilizationlmotion compensation, missile guidance. and flight control input functions. The SCINS family of INS products all havethe high reliability which has becomethetrademarkof Honeywell's military and commercial laser systems. The paper shows that current trends in the H-764 SCINS family are toward reduced size, weight, power and improved performance. Both GG1320gyro and system technology breakthroughs are making this possible. For example, the H-764C model (1 990-91) is only 7x7~11 inches, weighs less than 20 Ibs., uses 45-70 watts, and performs in the4 .0 nmilhr CEP range.The next model afterthat. the H-764D (1992+) is planned to be 7 x 7 ~ 9 inches, weigh lessthan 16lbs.,uselessthan40watts,andhave0.5-1.OnmiI hr CEP performance. Key features of SCINS models and supporting data are presented in the paper. lntrOductlon tary Laser Inertial Navigation System (MIL-LINS) RLG H-770 INUsfortheF-15AthroughEupgrade.andtheH-423 INUfor the SNU 84-1 Form, Fit, and Function (F3) Standard Inertial Navigator program. These units are on the C-130, F-4. A-7, C-160, and many other aircraft. The H-764 SCINS is also related to the US. Army Modular Azimuth Position System (MAPS) H-726 Dynamic Reference Unit and the Army Tactical Missile System (ATACMS) Inertial Guidance Unit. Honeywell RLGinertialsystemsarealsostandardequipmentonthecommercial Boeing 757,767,737-300,747-400, and Airbus A320, as well as most business aviation aircraft. Dithered RLG systems are displacing conventional gyro systems throughout the world for many reasons, including: Their demonstrated reliability and large production base offerthe highest availability as well as the lowest acquisition and life cycle costs. Maintenance costs and spares needs are less than 112 those of conventional gimbaled inertial systems. Their heaterless design and cavity free of scatter producing multi-oscillator optics provide "instant-on" reaction time from power-on and fully rated performance over the miliaty operational temperature range without the need for temperature control. Honeywell's evolution of Ring Laser Gyro (RLG) INSs into smaller, lighter, lower power units is typified by the H-764 SCINS. il isdesigned to meet the small, lightweight, low-cost applications for helicopter and fixed-wing aircraft platforms with Attitude Heading Reference System (AHRS), full navigation, weapon initialization Radar1 EO sensor stabilizationlmotion compensation and flight control Sensor capabilities. The H-764 has also been designed for land vehicle applications. Theirperformance isconsistentlygoodoverawidevariety of applications and for many years of operational use. Honeywell's new GG1320 is presently on the way l o meeting its reliability goal of 100,000 hours MTBF. These benefas are shown in Table 1 along with other key features for present and future H-764 models. Currently underway is the incorporation of an integrated, tiahtlv couded Global Positionina Svstem (GPS) receiver H-764 SCINS Overvlew tinction. The H-764C current model 'of SCINS, j is t like its Model H-764A predecessor, incorporates State Of the art Sensors, electronics, and algorithms resulting in an extremely accurate navigator in apackageone third the size of current proThe 1988 model H.764A uses the Honeywell GG1328 RLG and Sundstrand QA2000 accelerometer. h weighs 27 Ibs. The H.764C ( ~ i ~ ~ ~ ~ 1), uses ~ ~ ~ ~ ~ ~ l r ~ new ~ ~ 1 3 2 0 model RLG and weiahs 20 Ibs, packaoe size is nOminallY a 314 ~~ duction RLG inertial systems. ATR short (17 inches for the H-764: model). H-764Abower consumption is 75W of 28 Vdc power. This reduces to 4 -70W in the H-7MCproduction model. All units operate without coollng air, in most Installations, throughout a full range of MIL SPEC environmentalvariations. The future model H-764D will be even smaller (9 inches long), lighter (16 Ibs). and use less Honeywell RLG systems have demonstrated high reliability in hundredsofthousandsof hours of militaryserviceand millions of hours of wmmercial airline service. In the miliary applications. theparentsystemstoSClNS includethe Honeywell Miliv 1 Copyright