milli-HRG Inertial Instrument Assembly
A.D. Meyer, A.A. Trusov, D.K Sakaida, Northrop Grumman Systems Corporation; D.M Rozelle, Northrop Grumman Systems Corporation - Retired
Location: Big Sur
The Hemispherical Resonator Gyro (HRG) has proven itself to be an ultra-reliable technology for space application with over 40 million operation hours and 100% mission success. Northrop Grumman Advanced Navigation Systems is developing a small size and lightweight terrestrial inertial sensor assembly (ISA) based on the HRG approach. This ISA will be the core of future inertial measurement unit (IMU) and inertial navigation system (INS) product lines.
The HRG presently produced by Northrop Grumman Systems Corporation is currently being uses in the inertial navigation market servicing space applications. The HRG 130P space gyro based Scalable Space Inertial Reference System (SSIRU) is the unchallenged sensor choice for critical high value missions, a choice based on its high performance (ARW: 0.000020º/rt-hr), unmatched reliability with over 38 million gyro operating hours in space without a mission failure, and extremely rugged nature with proven shock >3000 G and random vibration: >18 Grms performance.
While the use of the HRG has primarily for space markets, the physics behind HRG technology makes the expansion of its horizons into terrestrial markets inevitable. It is just such a shift that is currently occurring at Northrop Grumman in ongoing work in the development of the new milli-HRG Instrument Sensor Assembly, mHRG ISA and the implementation of disruptive technology; dynamic self-calibration.
Recent work at has not only focused on the development of reduced size instrument but on the implementation of dynamic self-calibration (DSC?) and the optimization of the complimentary Instrument Sensor Assembly.
Thus far tested in the laboratory environment, the mHRG-ISA coupled with DSC?, has shown performance levels that surpass those of the Sagnac instruments that are in popular use today. The mHRG-ISA does this in a reduced size, weight and power in comparison to the conventional systems put into use today.
In this paper an overview of the HRG and mHRG will be given as well as and update to observed performance thus far measured.