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Raytheon Anschütz

Standard 30 MF Gyro Compass

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Standard 30 MF
based on hemispherical resonator gyro technology

The Anschütz Standard 30 MF Gyro Compass is the second generation of maintenance free gyro compasses based on hemispherical resonator gyro (HRGs) technology. The use of HRG technology together with the simple design makes it extremely reliable with no wear and tear and no need for maintenance.

The mean time between failures (MTBF) value is more than 100,000 hours which is a multiple of the MTBF values of optical gyros (such as FOGs). The HRG technology has already been used in Horizon MF – the predecessor. The new Standard 30 MF is even smaller, can be used as rate-of-turn indicator (required for vessels above 50.000 GT according to SOLAS) and features an optimized integration into a Raytheon Anschütz heading management system. With Ethernet and CAN-bus interfaces, cabling efforts are minimized.

 

 

Facts & features for safe navigation

  • High accuracy of 0.25 degrees, ultra-robust design
  • Highly cost-effective over lifetime through maintenance-free technology
  • Superior and durable HRG technology (MTBF >100,000 h)
  • Significantly better longterm stability than an FOG, no drift
  • Heading sensor and MRU in one (roll and pitch output), thus reduction in investment and maintenance cost
  • Settling time of only one hour, settles at rough sea states
  • Heading monitor and selector with automatic switch-over (configurable)
  • Automatic speed / latitude error correction
  • Individual speed error correction

Modular system architecture

Standard 30 MF standalone

Standard 30 MF heading management system

Standard 30 MF heading management system with redundancy in distribution

Electrodes excite the resonator with a certain frequency which results in a stationary vibration pattern. Compared to the example, a finger strike sets the glass into vibration and makes a sound which can even be heard a few seconds later. The vibration pattern can be identified by four points at the ring of the glass that are moving the most – the so-called antinodes. The HRG measures this movement through pick-off electrodes.
If the glass is rotated around its axis – observe the reference point – the vibration pattern also rotates, but not as much as the glass does. In other words: The standing wave of the rotation pattern lags behind and the inertness of this pattern is based on the Coriolis force effect. The same shift of the rotation pattern is caused by a movement of the vessel. Note that the vibration frequency is much higher than the frequencies of the vibration spectrum of vessels and thus not affected adversely by the vessel. The movement is again measured by pick-off electrodes. This is a very simple and accurate way to sense and measure rotation as the degree of the lag is proportional to the angular rate of the movement of the ship.

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