Fiber Optical Solution’s fiber-optic strapdown inertial navigation systems (SINS) have complete solid-state design with no rotating or other moving parts. Because it has no moving parts, there is nothing to go out of alignment and therefore it never requires recalibrating and is totally maintenance free. They have very high reliability (MTBF) and no maintenance requirements during its service life.
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| NavFOS-5 | NavFOS-6 | NavFOS-2 |
Designed for autonomous navigation and guidance of aviation, land, marine and subsea vehicles, Fiber Optical Solution’s strapdown inertial navigation systems are compact, robust and maintenance-free, low-consumption units.
| Performance | For land and air navigation | For land and air navigation |
| NavFOS-5 | NavFOS-6 | |
| Alignment in static conditions | Alignment in static conditions | |
| Pure SINS performance
(inertial mode), accuracy: □ position (1-hour error) □ velocity □ heading □ pitch and roll |
8 km 2 m/s <0.3×sec(lat)° <0.1° |
4 km 1 m/s <0.1×sec(lat)° <0.05° |
| GPS-GLONASS/SINS
performance □ position accuracy □ velocity accuracy |
20 m 0.1 m/s |
20 m 0.1 m/s |
| Initialization time | 10 min (available options 15, 5 min) | 10 min (available options 15, 5 min) |
| Gyro bias drift (1s) | ≤ 0.04 °/h | ≤ 0.02 °/h |
| Accelerometer bias drift (1s) | ≤ 5×10-4g | ≤ 1×10-4g |
| Interfaces | RS-422 (MIL-STD-1553B option available) | RS-422 (MIL-STD-1553B option available) |
| Power supply | 27±5 V DC | 27±5 V DC |
| Power consumption | 15 W | 22 W |
| Size, mm | 240×160×110 | 286×163×124 |
| Weight | 3.4 kg | 4.8 kg |
| Operating ranges
□ angular rate □ linear accelerations □ vibration □ temperature range |
≤ 400 °/s Up to 10 g Up to 2000 Hz -30 °C to +60 °C |
≤ 1000 °/s Up to 10 g Up to 2000 Hz -30 °C to +60 °C |
Ultra compact NavFOS-2 is a new generation of strapdown inertial navigation system based on IMU IFOS-2 .
| SINS accuracy (RMS) | |||
| Modes | INS+GNSS | *INS+ADS | *INS + odometer |
| Roll,pitch, deg | 0.005 | 0.08 | 0.08 |
| Heading , deg | 0.3 | 0.5/Hr | 0.5/Hr |
| Position | 6 meters | 2 nm/hr | 0.5% of DT |
| Velocity | 0.1 m/sec | 0.2 m/sec | 0.25 m/sec |
| Size | 120x100x83 mm | ||
| Weight | 1.25 kg | ||
| * After 15 minutes of GNSS aided alignment | |||
The NavFOS-2 is a new generation of inertial systems based on FOG technology.
This new generation of SINS is based on an alternative approach to inertial navigation. A different self-damping procedure, instead of the traditional “Schuler loop,” is implemented. In principle, all systems are disturbed by nominal motion, such as accelerations. It seems reasonable to create different navigation solutions that are adjusted to the specific motion of the carrier (a multiplatform solution). However, some parameters of the navigation solutions, as well as the final solution creation, are unknown. In order to identify them, a special training program must be used. The principle of this program is based on the backpropagation algorithm. This approach can be considered an expert system of artificial intelligence.
The above technology is implemented in the NavFOS-2. The main advantage of this approach is the system’s high performance in autonomous mode without the presence of GNSS.
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