North-Seeking MEMS IMU

ER-MIMU-051
1. Size:70*65*45(with shell)/43.2*43.2*35.5 (without shell and baseboard);
2. OEM, modular design, strong applicability;
3. Can find north independently.

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Introduction

ER-MIMU-051 North-Seeking MEMS IMU

Introduction

Inertial Measurement Unit, referred to as IMU, is a device to measure the angular velocity and acceleration of the three axis of the object. Gyroscope and accelerometer are the core devices of inertial navigation system (INS). With the built-in accelerometer sensor and gyroscope, the IMU can measure the linear acceleration and rotation angular velocity from three directions and can obtain the attitude, velocity and displacement information of the carrier through the resolving.

ER-MIMU-051 integrates a three-axis high-precision gyroscope and a three-axis high-resolution accelerometer, and also features independent north-finding capability, accurately outputting true north direction in signal-free scenarios such as underground drilling, enclosed mines, and shielded environments. It also offers three selectable measurement ranges, which can be flexibly switched according to the carrier's speed, balancing accuracy and measurement range to meet all working conditions.

Features

Size:70*65*45(with shell)/43.2*43.2*35.5 (without shell and baseboard)

Weight:220(with shell) /100(without shell and baseboard)

OEM, modular design, strong applicability

-40~80°C temperature compensation

Can find north independently

Gyroscopic alignment systems and hole orientation instruments used in mining

Infrastructure engineering

Application

High-precision north seeker

Direction pointing and tracking in satellite antenna, target tracking system

North seeking in logging tools/gyro tools

Pointing, steering and guiding in advanced mining/drilling equipment

Initial alignment in UAV launch systems

Precision platform attitude measuring and controls

Precision attitude, position measuring in navigation grade MEMS IMU/INS

North finding and positioning in land surveying/land mobile mapping system

Specifications

ER-MIMU-051
Item	Parameter	Unit
Gyro performance	ER-MIMU-051	/
Range	50	deg/s
Scale Factor at 25°C	160000	LSB/deg/s
Scale Factor Repeatability (1σ)	<50	ppm
Scale Factor VS Temperature (1σ)	300	ppm
Scale Factor Non-Linearity (1σ)	<200	ppm
Bias Instability (1σ 25℃)	<0.01	deg/hr
Bias stability (10s 1σ)	<0.05	deg/hr
Angular Random Walk	<0.0025	°/√h
Bias Repeatability (1σ 25℃)	<0.1	deg/hr
Accelerometer performance
Range	30	g
Bias Stability (10s 1σ)	<75	ug
Bias Month Repeatability(1σ)	100	ug
Bias Temp Coefficient	<20	ug/℃
Bias Temp Hysteresis	<1.5	mg
Scale Factor Non-linearity	<500	ppm
Scale Factor Month Repeatability	<30	ppm
Scale Factor Temp Coefficient	100	ppm/℃
Class II Non-linearity Coefficient	<100	ug/g²
Scale Factor	250000	Lsb/g
Environment and power
Operate temperature	-40~+80	℃
Storage temperature	-55~+105	℃
Power supply	6~12V DC	V
Power (power supply 6V)	2	W
Communication interface	RS-422
Physical characteristics
Size	706545(with shell)/43.243.235.5 (without shell and baseboard)	mm
Weight	≤220(withshell) ≤100(without shell and baseboard)	g

Dimension

Product composition and working principle

The product is mainly composed of three-axis MEMS accelerometer and gyroscope. The working principle is as follows: the gyroscope and accelerometer data are collected by ARM microcontroller, three high-precision gyroscopes are collected by 1-channel digital interface SPI, and three accelerometers are collected by another 1-channel digital interface SPI. All sensors are calibrated and compensated in software after acquisition.

Product technical characteristics

A)The product is designed for miniaturization and low power consumption;

B)Products with wide voltage design.

Electrical interface

The MIMU inertial measurement unit uses J30J-15ZKN-J output. Electrical pin definitions are shown in Table 1.

Table 1 Pin definition of MIMU high precision inertial measurement unit

Pin number	Electrical characteristic	Signal direction	Remark
1	VCC	Power +	6-12V
2	Retain, disable
3	GND	Power supply -
4	Retain, disable
5	Retain, disable
6	RS422,TX+
7	RS422,TX-
8	RS422,RXD+
9	RS422,RXD-
10	Retain, disable
11	Retain, disable
12	Retain, disable
13	Retain, disable
14	Retain, disable
15	Retain, disable

Communication protocol

RS-422 serial interface, default baud rate 921600bps, 8bit data bit, no check bit, 1bit stop bit, specific communication protocols are shown in Table; The default data refresh rate is 400Hz.

Data output protocol

Byte	Define	Note	Range	Units	Measuring scale
1~4	Protocol Head	EB8055AA
5~8	X axis angular rate	int	-100~+100	deg/s	500/(2^31-1)
9~12	Y axis angular rate	int	-100~+100	deg/s	500/(2^31-1)
13~16	Z axis angular rate	int	-100~+100	deg/s	500/(2^31-1)
17~20	X axis accelerated speed	int	-30~+30	m/s^2	300/(2^31-1)
21~24	Y axis accelerated speed	int	-30~+30	m/s^2	300/(2^31-1)
25~28	Z axis accelerated speed	int	-30~+30	m/s^2	300/(2^31-1)
29~32	IMU temperature	float
33	Frame count	unsigned char	1~255
34	Sum	unsigned char	Byte 3~60 summation

Test interface operation description

The user installs the test interface on the computer, open xInsConnect.exe, as shown below.

Click "COMCFG" to configure the baud rate of RS422 serial port, which is the COM port required; Click the "Open" button to open the RS422 communication interface and power on the IMU.

The Angle data of X,Y,Z gyro "GX,GY,GZ", the data of X,Y,Z accelerometer "ACCX,ACCY,ACCZ" will be displayed on the interface. The temperature data of IMU will be displayed in the "TX" box. Click "CAL" box to set the data update rate of the interface to 100. The "Counter" box displays the frame serial number for each frame of data.

051

Precautions for use

1)Installation error description

Internal orthogonal compensation has been carried out for the whole product. If the platform used by the product cannot guarantee the accuracy of the benchmark after installation, please compensate the installation error accordingly.

2) Installation and protection

When the product is installed, it should be tightly installed parallel to the base level of the carrier installation (the installation error with the base level should be less than 0.05°).

Because the product is a precision test instrument, although there is a shell protection, in order to protect the product damage, users should handle gently. The use and movement of the product should avoid falling, and be sure not to let the product and other components in the use of serious impact, to ensure the accuracy of the product datum requirements.

After sale

Please do not disassemble this product without our company's permission, if disassembled without permission, the warranty will be invalid.

If there is any technical problem or failure in the use of the product, you can contact the corresponding technical personnel of our company.