F120H type

F120H type



1 Introduction

    fiber optic gyroscope as a new type of all-solid-state gyroscope, has the advantages of fast start-up, wide measuring range and high reliability. F120H single-axis medium and high-precision fiber optic gyroscope can be applied to the application requirements of high-precision inertial guidance systems such as land-based positioning and orientation, vehicle-mounted north finder, airborne heading, marine gyroscope compass, etc.

1.1 Application scope

   This manual is only applicable to F120H type products, including performance indicators, technical conditions, external dimensions and installation and use. Among them, the technical conditions include the environmental range, electrical performance, and physical characteristics of the product.

1.2 Main parameters

1.2.1 fiber optic gyroscope instrument main performance indicators.

Table 1 Main performance indicators of the product


Type A

B type

Type C


zero stability °/hr(1σ,10s)





zero stability °/hr(1σ,100s)





Stability time s





zero drift repeatability °/hr(1σ)





full temp zero drift repeatability °/hr





random walk coefficient °/





scale factor non-linearity degree ppm





scale factor repeatability ppm





full temp scale factor repeatability ppm





dynamic range



Magnetic field sensitivity



Operating temperature



Storage temperature



Vibration condition

4.2 g,20 Hz2000 Hz


1.2.2 Mechanical test Random vibration for vehicle

Vibration frequency: 20 Hz~500 Hz.

Vibration time: 15 min per axial direction.

vibration direction: X, Y and Z directions.

Vibration spectrum: as shown in Figure 1.2.

                               Figure 1.2 random vibration spectrum for vehicles

Random vibration: the absolute value of zero drift value in vibration and the average value of zero drift before and after is required to be less than 0.05 º/h. Mechanical shock according to the requirements of Table 2.

Table 2 impact test conditions

Peak acceleration (g)


Duration (ms)


Number of shocks

3 times in each direction


Half sine wave


X, Y, Z


Note: The interval between two shocks is not less than 1.5 s


During the impact process, the product is in the energized state, complete mechanical impact products, should be able to work normally, the zero change value before and after the impact is less than 0.02 º / h.

2 Communication protocol

2.1 fiber optic gyroscope communication protocol

        2、 Communication protocol

2.1 RS-422 mode (bidirectional)

1) Bidirectional serial communication, conforming to RS-422 interface standard.

2) External trigger signal, 10 to 2000 HZ square wave.

3) gyroscope valid data of 32 bits.

4) temperature valid data of 14 bits.

5) Data transmission baud rate of 460.8 kbps.

6) Data format.

a) Data transmission format: 11 bits per frame, including: the first bit is the start bit (0), the second to the ninth bit is the data bit, the tenth bit is the even parity bit, and the eleventh bit is the stop bit.

b) calibration mode: even parity.

c) gyroscope valid data is 32 bits (the highest bit is the sign bit, 0 is "+", 1 is "-"), the temperature valid data bit 14 bits (the highest bit is the sign bit, 0 is "+", 1 is "-").

d) Packet format: each transmission includes 10 bytes, the first byte is the frame header (80 H); the second byte is the first byte of gyroscope data (low byte); the third byte is the second byte of gyroscope data; the fourth byte of gyroscope data; the fifth byte is the fourth byte of gyroscope data; the sixth byte is gyroscope fifth byte data (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 temperature data; the ninth byte is the high byte of temperature data; the tenth bit is the check bit, which is the XOR value of the first eight bytes (gyroscope data) in the data packet.

e) Data storage method.


                                                                                      Fig. 2 Dimensional drawing of F120H model

The fiber optic gyroscope instrument leads externally to the J30-15ZK socket, and the J30-15ZK socket contacts are defined in Table 1.

Table 1 gyroscope output socket electrical characteristics

Contact number

Contact Definition






PSU ground






Serial port R+



Serial R-



Serial T+



Serial T-