Press Release: Systron Donner Inertial Awarded Spearfish Heavyweight Torpedo IMU Contract from BAE Systems


Concord, CA – August 13, 2015 – BAE Systems has awarded a contract to Systron Donner Inertial (SDI), a brand of Custom Sensors & Technologies (CST), for an Inertial Measurement Unit (IMU) integral to the Guidance and Control Assembly (G&C) required for the Spearfish Heavyweight Torpedo Program.

The core of SDI’s solution is its SDI500 IMU delivering true tactical grade performance with <1º/hr. bias stability across full temperature, class leading 0.02º/√hr. angle random walk and 1 mg accelerometer bias performance. The compact, low power, high quality SDI500 IMU enables superior guidance and control of the Spearfish Torpedo during in-water maneuvers, plus improved system cost-effectiveness, reduced obsolescence and increased sustainability for BAE Systems.

“SDI is honored to be selected as part of the Spearfish Torpedo Program,” said David Hoyh, Director Sales & Marketing for SDI. “On June 9, 2015 SDI delivered the 1,000th SDI500 tactical grade IMU. Now customer’s worldwide are experiencing the superior inertial bias and low noise performance benefits of the Quartz MEMS IMU, in a smaller, lighter, more reliable, cost-effective product than traditional tactical grade technologies.”

The contract value is $2.9 million. Work is to be completed by December 2017.

For further information and specifications on the SDI500 or for information on the complete SDI product line, call +1 925-979-4500, e-mail:; or visit