S-F 120 Fiber Optic Gyroscope
S-F120H fiber optic gyro is a high-precision single-axis
closed-loop fiber optic gyro, as shownin Figurel , the structure of
the optical system and the circuit system in one package, stable
andreliable performance, easy and convenient to install, the user
only needs to provide power supplythrough a plug to receive the
output data of the gyro can be used. This product can be used in
aviation.aerospace,marine,automotive electronics and other fields.
Figure 1 S -F120H fiber optic gyroscope model
1 Performance indicators
The performance indicators of the Table .
Table 1 Performance index of S -F120H fiber optic gyroscope
| NO | parameter | unit | 1 20 HA | 1 20 HB | 1 20 HC |
| Measuring range | °/s | -400~+400 | -400~+400 | -400~+400 |
| Bias stability (1 s, 100s) | °/h | ≤0.001 | ≤0.002 | ≤0.003 |
| Zero bias repeatability (1 s) | °/h | ≤0.001 | ≤0.002 | ≤0.003 |
| Scale factor asymmetry | ppm | ≤10 | ≤20 | ≤20 |
| Scale factor repeatability | ppm | ≤10 | ≤20 | ≤20 |
| Scale factor nonlinearity | ppm | ≤10 | ≤20 | ≤20 |
| Full temperature scale factor change | ppm | ≤30 | ≤50 | ≤50 |
| Random walk coefficient | °/h 1/2 | ≤0.0002 | ≤0.0003 | ≤0.0004 |
| Steady-state power consumption | W | ≤4.0 | ≤4.0 | ≤4.0 |
| bandwidth | Hz | ³200 | ³200 | ³200 |
| weight | g | ≤900 | ≤900 | ≤900 |
| Operating temperature | ℃ | -45~+70 | -45~+70 | -45~+70 |
| Storage temperature | ℃ | -50~+75 | -50~+75 | -50~+75 |
2 Product size
The appearance and installation dimensions of Figure the S -F120H
fiber optic gyroscope are shown in Figure 2.
Figure 2 Appearance and installation dimensions of S -F120H fiber
optic gyroscope
3 Electrical interface
3.1 Power Requirements
the S -F120H fiber optic gyroscope power supply are shown in Table
Table 1.
Table 1Power supply requirements for fiber optic gyroscope
| parameter | Technical requirements | Remark |
| Supply current(A) | +5V: Current ≥ 0.5A | Inrush current ≥1A |
| -5V: Current ≥ 0.2A | |
| Supply voltage (V) | ±5(±5%) | |
| Power ripple (mv) | ≤20 | Vpp |
3.2 Interface Definition
The gyro is connected to the external electrical system using a
J30-21ZK connector. The wiring definition is shown in
Table 2:
Table 2Gyroscope external electrical connection table (J30-21ZK)
| Gyro output mode | Model 422 |
Power supply socket ( J30-21ZK) | Connection table between mainboard and acquisition line |
| 8, 10 (required) | +5V |
| 6, 7 (required) | DGND(AGND) |
| 13, 14 (required) | -5V |
| 16 (422 interface is valid) | 422 communication signal T+ |
| 19 (422 interface is valid) | 422 Communication signal T－ |
| 15 (422 interface is valid) | 422 communication signal R+ |
| 18 (422 interface is valid) | 422 Communication signal R－ |
3.3 Communication protocol
RS-422 method
- Serial communication, in line with RS-422 interface standard;
- Data update interval: 2.5ms, data transmission baud rate:
115.2kbps;
- Data Format:
- Data transmission format: Each frame of data is 11 bits, the first
bit is the start bit (0), the 2nd to 9th bits are data bits, the
10th bit is the even parity bit, and the 11th bit is the stop bit;
- Check mode: even check;
- The gyroscope valid data is 32 bits (the highest bit is the sign
bit, 0 is "+", 1 is "-"), and the temperature valid data is 21 bits
(the highest bit is the sign bit, 0 is "+", 1 is "-");
- Data packet format: Each transmission includes 10 bytes in total.
The first byte is the frame header (80H); the second byte is the
first byte data of the gyroscope (low byte), the third byte is the
second byte data of the gyroscope, the fourth byte is the third
byte data of the gyroscope, the fifth byte is the fourth byte data
of the gyroscope, and the sixth byte is the fifth byte data of the
gyroscope (high byte); the seventh byte is the check bit, which is
the XOR value of the first five bytes (gyroscope data) in the data
packet; the eighth byte is the low byte of the temperature data,
the ninth byte is the middle byte of the temperature data, and the
tenth byte is the high byte of the temperature data;Data storage
method:
| High | | | | | | | Low |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 0 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
| 3 | 0 | D13 | D12 | D11 | D10 | D9 | D8 | D7 |
| 4 | 0 | D20 | D19 | D18 | D17 | D16 | D15 | D14 |
| 5 | 0 | D27 | D26 | D25 | D24 | D23 | D22 | D21 |
| 6 | 0 | 0 | 0 | 0 | D31 | D30 | D29 | D28 |
| 7 | 0 | X | X | X | X | X | X | X |
| 8 | 0 | T6 | T5 | T4 | T3 | T2 | T1 | T0 |
| 9 | 0 | T13 | T12 | T11 | T10 | T9 | T8 | T7 |
| 10 | 0 | T20 | T19 | T18 | T17 | T16 | T15 | T14 |
