TDFG99IMU0 Fiber Optic Inertial Unit

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Introduction

Accesories

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Overview

Fiber optic inertial units have the advantages of small size, light weight, low power consumption, and high accuracy. They can be used to design pure strapdown systems, meet the needs of new unmanned platforms, water/torpedo weapons, as well as land, airborne, and missile weapon platforms for small size and high-precision inertial unit equipment, and have dynamic measurement functions for carrier angular and linear motion information.

Performance indicators

Project	Content	Index	Notes
Performance indicators of gyroscope
Zero bias indicator	Zero bias stability (100s)	0.005°/h
	Zero bias stability (10s)	0.01°/h
	Variable temperature zero bias stability	0.02°/h
Scale Factor	Full temperature scale factor	≤150ppm
Other indicators	Random walk coefficient	0.001°/√h
Other indicators	Input range	400°/s
Performance indicators of accelerometer
Deviation index	Deviation monthly comprehensive error	20μg
Zero bias indicator	Zero bias temperature sensitivity	20μg/℃
Scale Factor	Scale factor monthly comprehensive error	20ppm
Scale Factor	Scale factor temperature sensitivity	20ppm/℃
Range indicator	Input range	±20g
Whole machine characteristics
Environmental performance indicators	Operation temperature	-40℃～60℃
Environmental performance indicators	Storage temperature	-45℃～70℃
General requirements	Power supply	18～36V（DC）
General requirements	Stable power consumption	≤15W	Startup power consumption ≤ 25W

Communication protocols

This article is a communication protocol for recording data in the universal debugging interface of aerospace unified software. The baud rate of the debugging data output by the software is 460800, with 8 data bits and 1 stop bit, no checksum, and sent in low to high order. General debugging data includes IMU raw data, user command data, satellite navigation record data, navigation result data, etc. The specific agreement is as follows.

The output frequency of IMU raw data is 200Hz, and the protocol is as follows:

SN	Message content	Type	Notes
1~2	frame header	char	0x5A、0x54
3	frame length	char	0x1E
4	Frame ID	char	0x04
5~8	Frame Number	int	200Hz accumulation
9~11	X accelerometer output	char×3	Note 1
12~14	Y accelerometer output	char×3
15~17	Z accelerometer output	char×3
18~20	X gyroscope output	char×3	Note 2
21~23	Y gyroscope output	char×3
24~26	Z-gyroscope output	char×3
27	reserve	char
28~31	reserve	int
32~33	reserve	short	0x5A、0x54
34	checksum		Total of 4-33 bytes

Electrical interfaces

The external electrical interfaces of the inertial group equipment include power interface RS422 communication interface and 100Mbps Ethernet interface. The socket model for the external electrical interface is J30JM-37ZKP, and the matching plug model is J30J-37TJL.

Pin	Connectivity	Signal name	Signal characteristics
1、2	External power supply	PCS power supply positive	24V
3、4	External power supply	PCS power supply ground	Power Ground
5	200Hz signal output	IMU_TX1+	IMU data output positive
6	200Hz signal output	IMU_TX1-	IMU data output negative
9	Synchronization signal	IMU_SYN+	IMU synchronization signal positive
10	Synchronization signal	IMU_SYN-	IMU synchronization signal negative