Accelerometer for missile guiding systems
The latest defensive technologies rely heavily on the use of long-range artillery. As such, it’s mandatory that the use of these systems doesn’t present a high risk of civilian casualties. In order to combat this risk, modern artillery systems, smart munitions and small missiles require precision, accuracy and the ability to operate independent of GPS control. These types of projectiles have to integrate independent and reliable self-destruct mechanisms using sensors such as accelerometers. Not only do the accelerometers used in these systems have to perform after the initial shock, but they also have to perform after impact, allowing the weapon to self-destruct or render itself inert as to prevent civilian casualties if the target hasn’t been eliminated.
The deployment of guided munitions generates high levels of shock, which is defined as an extreme acceleration characterized by amplitude (usually measured in g), time (usually measured in m/s) and profile (usually half a sine). As such, gun-hard accelerometers for inertial applications have to survive increased levels of shock while still providing stability and accuracy after the initial shock.
The MEMS revolution
MEMS accelerometers are robust and cost-effective, presenting an inherent tolerance to high shock values. Sensors have been centrifuged up to 40.000 g without any degradation. Moreover, the materials used for making the accelerometer have to isolate and reduce vibrations, preventing balloting shock during gun-hard shock as well as any level of vibration from exerting potentially harmful resonances within the structure of the sensor.
Colibrys MEMS accelerometers for Missile Guidance Systems
Colibrys has successfully developed a unique solution for applications requiring inertial-grade specifications combined with gun-hard survivability and exceptional post-shock stability. The Colibrys HS8000 family of MEMS accelerometers offers long-term stability in terms of bias and scale factor, very high shock survivability and an integrated temperature sensor. It is available in ranges +/-30 g and up to +/- 100g and serves as a cost-effective solution for missile guidance systems.
The product has been extensively tested both as a standalone accelerometer and in IMU formation, with post-test results confirming the sensor’s mechanical ruggedness and high sensitivity under harsh conditions typical to missile deployment.