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What is inertial navigation for ADAS? – Murata accelerometers




Inertial navigation is navigation based on inertial components providing the information on the six degrees of freedom; yaw, pitch, roll, and three axis acceleration.

This data is independent of the environment and not susceptible to image recognition or other similar technologies.

There are many forms of inertial navigation system (INS), but one commonality between them all is their use of multiple inertial sensors and some form of central processing unit to keep track of the measurements coming from those sensors. The sensors used in an INS are typically gyros and accelerometers – and there are normally several of each inside. Automotive applications are typically used to handling GPS-based systems, but INS represents a departure from this approach.

The measurement that an INS generates is relative to their last known position, so even after an inertial navigation system has been turned on for several minutes, it cannot specify where it is, but it can ascertain that it hasn’t moved. If the INS knows where it started, it can easily work out where it is, based on its own measurements. That is how spaceships and aircraft successfully navigate using an INS – because they know where they started from.

The big benefit for inertial navigation for the development of ADAS is that it goes above and beyond the technologies that are typically used in cars. In autonomous driving, the demands on exact location information rise significantly, compared with that of traditional driven vehicles. The cars need to know not just which road but which lane they are in, and the margin for error is small.

Murata has already started to realize the sensors for INS.

The Murata SCC2000 series of combined high-performance angular rate and accelerometer sensor components based on Murata’s proven capacitive 3D-MEMS technology.

 


Key features of SCC2000 series

  • Fully integrated gyro accelerometer combo with:
    • Single axis gyro: X or Z axis (horizontal or vertical)
    • 3-axis accelerometer (X, Y, Z)
    • Gyro only version available also
  • Excellent bias stability, low noise level
  • Robust MEMS designs and high performance in harsh environment
    • Good performance under mechanical vibrations
    • Good mechanical shock endurance
  • Digital Output (SPI-interface)
  • Bandwidth for both accelerometer and gyro:
    • –10/60 Hz (user selectable via SPI interface)
  • Several advanced self-diagnostic features
  • Temperature range: -40°C … +125°C
  • 24-pin pre-molded SOIC package:
    • –8.5 x 15.0 x 4.3 mm
  • Supply voltage range (analog + digital): 3.0V-3.6V
    • Current consumption: Z-rate type 23 mA, X-rate type 25 mA


Key benefits of SCC2000 series

  • Cost savings
    • Z axis gyro is a major benefit for INS manufacturers, vertical PCB not needed and system level cost savings
    • Lower component cost
  • Smaller housing, lower power consumption, single power supply
  • Improved accelerometer performance:
    • Better linearity
    • Lower noise level
    • Better temperature stability due to 2nd order internal compensation



The SCC2000 series is targeted at applications demanding high stability with tough environmental requirements.

If you would like to see more details about SCC2000 series, please feel free to visit our website or connect with us.

Check RS stocks of SCC2000 series

Murata is a leading manufacturer of electronic components, modules, and devices. The complete range includes ceramic capacitors, resistors/thermistors, inductors/chokes, timing devices, buzzers, sensors and EMI suppression filters. Whilst the company is known as a global ceramic capacitor manufacturer, it is also a world leader in Bluetooth® & WiFi™ Modules, board-mount DC-DC converters and is a key manufacturer of standard and custom AC-DC power supplies.

8 May 2018, 14:25