BAE Systems Integrated Solutions has been awarded an $18.3 million contract to build Replacement Attitude Heading Reference System (R-AHRS) units for US Navy HH-60 and SH-60 helicopters.
The units provide helicopter pilots with information on attitude and heading angles during operation in instrument flight conditions, especially at night or during poor-visibility conditions. The system also provides the autopilot with signals required for helicopter stabilisation and control.
According to BAE Systems, the newly redesigned units offer improved output accuracy and system reliability through the use of inertial sensors and processing algorithms. The design is also said to improve safety and maintainability by providing extensive built-in test coverage for timely identification of potential malfunctions.
Each R-AHRS unit consists of a strap-down inertial measurement unit, a processor, and an external magnetometer. The system incorporates BAE Systems’ AHRS algorithms, whose functions include automatic in-air magnetometer calibration.
The contract calls for the company to deliver up to 60 units a month starting after production approval by the Navy.