F3X90-IMU 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. Among them, F3X90-IMU type fiber optic gyroscope inertial group is designed for the needs of low and medium precision application background, using three-axis common technology, low cost and stable performance; the structure of the optical circuit, circuit integrated package, simple structure, easy installation, can be applied with small missiles, guided bombs in navigation guidance, attitude measurement and control systems.

1.1 Application Scope

   This manual is only applicable to F3X90-IMU type products, and contains 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.

fiber optic gyroscope instrument main performance indicators	Main parameters	Main indicators
		H type	M type
	Room temperature zero drift repeatability（period-by-period,day-by-day）（ º/ h)	≤0.1	≤0.2
	ZERO stability at fixed temperature（ º/ h)	≤0.1	≤0.2
	Room temperature scale factor repeatability （ ppm)	≤20	≤50
	Scale factor asymmetry at constant temperature (ppm)	≤20	≤50
	Scale factor non-linearity at constant temperature (ppm)	≤30	≤50
	Threshold (º/ h)	≤0.2 º/ h
	Angular rate range（ º/s)	-500～+500 º/s
	Bandwidth (Hz)	≥200
	Dimensions (mm)	90*90
	Weight (g)	980±20 (with accelerometer)
	Operating temperature (℃)	-45～+65

1.2 Main parameters

1.2.1 Main performance indicators of fiber optic gyroscope instrument.

Table 1 The main performance indicators of the product

fiber optic gyroscope instrument main performance indicators	Main parameters	Main indicators
		H type	M type
	Room temperature zero drift repeatability（period-by-period,day-by-day）（ º/ h)	≤0.1	≤0.2
	ZERO stability at fixed temperature（ º/ h)	≤0.1	≤0.2
	Room temperature scale factor repeatability （ ppm)	≤20	≤50
	Scale factor asymmetry at constant temperature (ppm)	≤20	≤50
	Scale factor non-linearity at constant temperature (ppm)	≤30	≤50
	Threshold (º/ h)	≤0.2 º/ h
	Angular rate range（ º/s)	-500～+500 º/s
	Bandwidth (Hz)	≥200
	Dimensions (mm)	90*90
	Weight (g)	980±20 (with accelerometer)
	Operating temperature (℃)	-45～+65

 

Quartz accelerometer parameters

 

1.2.2 Mechanical test

1.2.2.1 Sine scan vibration

The gyroscope is fixed on the shaking table by tooling according to the vibration direction. gyroscope performs sine scan in 3 directions, corresponding to 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 ≤ 1º /h, the absolute value of zero drift difference between before and after vibration ≤ 0.3 º / h.

1.2.2.2 Mechanical shock according to the requirements of Table 2.

Table 2 impact test conditions

During the impact, the product is in an energized state, complete mechanical impact products, should be able to work normally, the absolute value of the difference between zero drift before and after the impact ≤ 0.3 º / h.

2 Communication protocol

2.1 fiber optic gyroscope communication protocol

Baud rate: 460800 without parity bit, 1 stop bit

Transmission frequency: 200Hz

Transmit data protocol.

Byte	Name	Unit	Value	Conversion	Type
0	Frame header byte 1		0xAA		uchar
1	Frame header byte 2		0xAA		uchar
2	Data transmission count		1~200		uchar
3	Self-test byte		255		uchar
4~7	X-axis gyroscope		32bit low bit before high bit after		signed int32
8~11	Y-axis gyroscope		32bit low in front and high in back		signed int32
12~15	Z-axis gyroscope		32bit low in front and high in back		signed int32
16~19	X-axis accelerometer		32bit low in front and high in back		signed int32
20~23	Y-axis accelerometer		32bit low in front and high in back		signed int32
24~27	Z-axis accelerometer		32bit low in front and high in back		signed int32
28,29	X-axis gyroscope temperature		16bit low in front and high in back	1/16	signed int16
30,31	Y-axis gyroscope temperature		16bit low bit before high bit after	1/16	signed int16
32,33	Z-axis gyroscope temperature		16bit low bit before high bit after	1/16	signed int16
34,35	X-axis accelerometer temperature		16bit low bit before high bit after	1/16	signed int16
36,37	Y-axis accelerometer temperature		16bit low in front and high in back	1/16	signed int16
38,39	Z-axis accelerometer temperature		16bit low in front and high in back	1/16	signed int16
40	Checksum		4~39 byte iso-or sum		uchar
41	End of frame		0xBB		uchar

3、Wiring Definition

 

4、Product form factor

F3X90-IMU External Dimensions