F2X64 type

1 Introduction

    fiber optic gyroscope as a new type of all-solid-state gyroscope, has the advantages of fast start-up, wide measurement range and high reliability. F2X64 model is a two-axis low precision fiber optic gyroscope instrument can be applied to vehicle stabilization platform, guide head, crane bin and other fields.

1.1 Application scope

   This manual is only applicable to F2X64 type product, which contains the performance index, 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	≤0.5°/hr(1σ,10s)	≤1.0°/hr(1σ,10s)	2h continuous test, 10ssmoothing results
Stability time	＜10s	＜10s
zero drift repeatability	≤0.5°/hr(1σ)	≤1.0°/hr(1σ)	Calculated results from 3 tests
full temp zero drift repeatability	≤0.5°/hr	≤1.0°/hr
scale factor non-linearity degree	≤30 ppm(1σ)	≤50 ppm(1σ)	room temperature
scale factor repeatability	≤50 ppm(1σ)	≤100 ppm(1σ)	ambient temperature
dynamic range	±400°/s
Bandwidth	≥100 Hz
Operating temperature	-40℃～+65℃
Storage temperature	-50℃～+70℃
Vibration condition	4.2g,20Hz～2000Hz

 

1.2.2 Mechanical test

1.2.2.1 Sine scan 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 5min; sine vibration. Vibration conditions: 20Hz-2000Hz , scan time 5min, amplitude 4.2g. During vibration, gyroscope output is recorded.

Random vibration                                                       

Vibration frequency: 20Hz~2000Hz

Vibration time: 5min 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 20HZ ~ 2000Hz 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 1º/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 the mechanical impact product, should be able to work normally, the zero change value before and after the impact is less than 1º / h.

2 Communication protocol

2.1 fiber optic gyroscope communication protocol

2.1 RS-422 mode

a) Baud rate: 921600bps.

b) Data refresh rate: 500Hz

c) Communication frame format

Each frame contains 8 bytes, the first byte is A5, the second, third and fourth bytes are the high and low octet data of gyroscope in horizontal direction, the fifth, sixth and seventh bytes are the high and low octet data in vertical direction, and the eighth byte is the result of the second to seventh bytes corresponding to each bit of heterodyne.

The format is shown in Table 2, with 11 bits per byte, in the following order Start bit 1 bit

Data bit 8 bits (send low first, then high), odd parity bit 1 bit, stop bit 1 bit

d) Communication rules

The gyroscope uses the broadcast type to send the numbers

Table 3 Format of the output data frame bytes

Number of bytes	Meaning	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
1	Frame header	1	0	1	0	0	1	0	1
2	Flat gyroscope high 8 bits	PD23	PD22	PD21	PD20	PD19	PD18	PD17	PD16
3	8 bits in flat gyroscope	PD15	PD14	PD13	PD12	PD11	PD10	PD9	PD8
4	Flat gyroscope lower 8 bits	PD7	PD6	PD5	PD4	PD3	PD2	PD1	PD0
5	Pendant gyroscope high 8 bits	CD23	CD22	CD21	CD20	CD19	CD18	CD17	CD16
6	8 bits in pendant gyroscope	CD15	CD14	CD13	CD12	CD11	CD10	CD9	CD8
7	Pendant gyroscope lower 8 bits	CD7	CD6	CD5	CD4	CD3	CD2	CD1	CD0
8	Frame checksum	Byte 2 to 7 isochronous by bit

 

3 Wiring Definition

The gyroscope electrical interface uses the J30-15ZK connector, see Table 4 for node definitions.

 

4 External dimension drawing

Horizontal dual-axis fiber optic gyroscope instrument form factor: 64mm × 60mm × 42mm, mounting size: four holes 53mm × 57 mm, mounting screws: four M3 screws, the shape and mounting dimensions are shown in Figure 2.

                                                                              Figure 2 F2X64 external dimensions