F70HA type

1 Introduction

    The 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. F70HA single-axis medium-high precision fiber optic gyroscope can be applied to the application requirements of medium-high precision inertial guidance systems such as land-based positioning and orientation, vehicle-mounted north finder, airborne heading and marine gyroscope compass.

1.1 Application scope

   This manual is only applicable to F70HA 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

zero stability	≤0.05°/hr(1σ,10 s)	2 h continuous test, 10 s smoothing results
Stability time	＜100 s
zero drift repeatability	≤0.05°/hr(1σ)	Calculated results from 6 tests
random walk coefficient	≤0.005°/
scale factor non-linearity degree	≤20 ppm(1σ)	room temperature
scale factor repeatability	≤20 ppm(1σ)	room temperature
full temp scale factor repeatability	≤300 ppm(1σ)	-40℃～+60℃
dynamic range	±400°/s
Magnetic field sensitivity	≤0.02°/hr/Gs
Operating temperature	-40℃～+70℃
Storage temperature	-50℃～+70℃
Vibration condition	4.2 g,20 Hz～2000 Hz	Sweeping frequency vibration without resonance

 

 

1.2.2 Mechanical test

1.2.2.1 Sine sweep vibration

The gyroscope is fixed on the shaking table by the tooling according to the vibration direction. The gyroscope is subjected to sinusoidal scanning in 3 directions, corresponding to the X-axis, Y-axis and Z-axis directions. Vibration steps; shaking table with excitation, powering up the gyroscope, after warming up for a certain time (gyroscope start-up time), testing the gyroscope output value, about 5 min; sine vibration. Vibration conditions: 20 Hz-2000 Hz , scan time 5 min, amplitude 4.2 g. During vibration, gyroscope output is recorded.

Random vibration

Vibration frequency: 20 Hz~2000 Hz

Vibration time: 5 min for each axis respectively

Vibration direction: X, Y, Z axis

Vibration spectrum: see the attached Figure 1

       Attachment Figure 1 vibration spectrum

Requirements

fiber optic gyroscope in the range of 20 HZ ~ 2000 Hz sine sweep scan without resonance.

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 0.1 º/h.

1.2.2.2 Mechanical shock according to the requirements of Table 2.

                                          Table 2 impact test conditions

 

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 0.05 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, adaptive from 10 HZ to 4000 HZ.

3) starting to send data outward after the gyroscope detects the falling edge of the external trigger signal.

4) gyroscope valid data is 32 bits.

5) the valid data of temperature is 14 bits.

6) data transmission baud rate of 460.8 kbps.

7) 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 (80H); 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 F70HA type

The fiber optic gyroscope instrument leads externally to the J30-15ZK socket, and the definition of the contact points is shown in Table 1.

Table 1 gyroscope output socket electrical characteristics