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MEMS device ups motion, navigation control

Posted: 18 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:GPS satellite navigation? GPS? MEMS?

ADIS16355 from ADI

Like the Internet, GPS satellite navigation is now ubiquitous technology integrated into all aspects of daily life. GPS enables emergency vehicles to find the quickest response route in life-or-death situations, allows marine archaeologists to direct research vessels hunting for shipwrecks and guides farmers in determining where to position their equipment to ensure their crops are planted for maximum yield.

A new inertial sensing solution introduced by Analog Devices Inc. compensates for GPS signal loss or vehicle-induced signal irregularities in truck fleets, agricultural equipment, commercial and small aircraft, as well as ships, tankers and other vehicles that rely on GPS satellite navigation to maintain accurate positional information.

Leveraging ADI's iMEMS Motion Signal Processing Technology, the ADIS16355 inertial measurement unit (IMU) allows industrial designers for the first time to equip their systems with sophisticated motion analysis and navigational dead reckoning functions previously reserved for defense, aerospace and other high-end applications, at approximately one tenth of the cost.

By detecting tiny shifts in linear acceleration and angular movement, ADIS16355 provides dead reckoning, allowing vehicles to remain on course until a lost GPS signal is restored. Aside from navigation, ADIS16355 can be used in highly sensitive robotic and other motion control devices, where the IMU helps make certain that precision movements can be accurately repeated thousands of times. For instance, ADIS16355 helps stabilize an aerial camera in motion picture production. It also controls a robotic arm in factory automation and ensures stability in a prosthetic limb.

Easily incorporated into industrial system designs where performance is enhanced by precise motion analysis and control, ADIS16355 enables designers to realize up to 12 months faster development times. The new IMU extends ADI's iSensor sensor product family.

ADIS16355 is a multi-axis motion sensor that cost-effectively combines gyroscopes and accelerometers to measure all six possible degrees of mechanical freedom (6DOF), linear motion in and rotation around the X, Y and Z axes. Other less integrated sensors require designers to perform complex, costly and time-consuming motion testing and calibration across multiple axes to ensure that the devices can provide accurate and stable feedback. ADI overcomes this barrier by submitting the ADIS16355 to a comprehensive factory calibration process and providing the new sensor with a simple, programmable interface to ensure it is both highly precise and ready for integration right out-of-the-box. ADIS16355 also includes full-temperature-range calibration, vs. the room temperature calibration available in the ADIS16350 and provides a superior bias temperature stability of 0.005/s/C.

Intelligent sensor
With similar devices ranging in price from several hundred to several thousand dollars, many applications have been unable to afford the level of precision enabled by the ADIS16355 and ADIS16350, which also provide a 50-times improvement in sensor accuracy compared to other off-the-shelf inertial sensors. A more significant barrier is that the complexities involved in integrating and testing a complete solution starting from the basic sensors presents an extremely complex design challenge. The outstanding cost-performance ratio of the ADIS16355 and ADIS16350 is complemented by unprecedented ease of use, which ensures industrial designers can quickly integrate motion sensing functions into a range of applications.

Combining three axes of angular rate sensing and three axes of acceleration sensing, the ADIS16355 IMU provides 6DOF motion sensing, embedded calibration and sensor processing, sensor-to-sensor cross compensation and significantly improved signal stability (in-run bias stability of 0.015deg/s) in a form factor smaller than a 1-inch cube. Factory calibration and embedded cross-axial alignment compensation enable designers without sensor expertise to quickly, easily and cost-effectively integrate motion sensing technology to add an entirely new dimension of performance to their applications. Both the ADIS16355 and ADIS16350 include a programmable SPI port that provides easy access for programming features such as filtering, sample-rate, power-management, self-test and sensor condition status and alarms. The devices are fully in-system tunable, allowing designers to quickly and easily debug their systems and experiment with different configurations for design optimization. ADIS16355 provides exceptionally precise and stable sensor response and ADIS16350 offers a lower cost alternative for less sensitive applications.

ADIS16350 is available now and priced at $275 per unit in 1,000-unit quantities. ADIS16355 will sample in July and will release to full production in September. The new device is priced at $359 per unit in 1,000-unit quantities. The IMUs are housed in compact modules measuring 23-by-23-by-23mm.

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