ER-MNS-04 Fast Alignment MEMS North Seeker for Heading Machine 

Introduction

ER-MNS-04 fast north seeker adopts the latest MEMS gyro technology, breaking through the volume and performance limitations of traditional directional equipment, compressing the volume to the extreme, meeting the integrated operation requirements, and can be easily embedded in various small devices or complex systems. Mainly used in scenarios that require fast alignment.

By sensing the horizontal component of the earth's rotational angular velocity, the true north direction is measured without relying on an external reference benchmark, providing a high-precision azimuth benchmark for complex environments. The fastest fast alignment is 30s, and the user can choose 30s and 90s for the fast alignment time. The fast alignment accuracy can reach 1° or 0.5°.

It adopts three-axis MEMS gyroscope and three-axis MEMS accelerometer strapdown inertial measurement technology, embedded with the original "Chinese Tripod" structure inner platform, through the all-solid-state design without moving parts and high-density packaging, it has strong stability, can withstand strong impact and vibration, and stably output reliable north-seeking data in complex environments.

Modular design, support flexible OEM customization, compatible with mainstream communication interfaces, and meet the needs of fast embedding in different scenarios.

 Technical Features

1. Adopt the latest MEMS gyro technology, with the ultimate volume compression, the size is 40×40×42 (with shell)/27×26×34 (inner table);
2. Adopt the latest three-axis MEMS gyro, three-axis MEMS accelerometerstrapdown inertial measurement technology;
3. Full solid-state design, built-in inner table, excellent impact and vibration resistance, and resistant to harsh environment;
4. Modular design, OEM is available, the inner table adopts China Ding design, high reliability;
5. It has the function of self-seeking north, not affected by magnetic field;
6. It can realize fast alignment/seeking north, and the fast alignment time can be selected by users: 30s, 90s;
7. 30s fast alignment, alignment accuracy 1°, 90s precise alignment, alignment accuracy 0.5°;

Applications
Fast alignment
Directional pointing and tracking in satellite antenna and target tracking systems
Orientation and axis calibration in tunneling
Direction and trajectory control in underground engineering pipeline tracking and mapping
Track control and azimuth calibration of underground drilling equipment
North finding in land surveying/geological instrument exploration
Precision platform attitude measurement and control

Specifications

Model No.	ER-MNS-04AD	ER-MNS-04BD
Azimuth accuracy (1σ,°secψ)	1	0.5
Attitude accuracy(1σ,°)	≤0.3
Azimuth accuracy retaining time	20min
Attitude accuracy retaining time	20min
Azimuth measurement range(°)	0~360
Inclination angle measurement range(°)	-85~85
North seeking time	30s (90s optional)
North seeking method	Stationary
Update Rate (Hz)	100
Environment and power
Operating temperature (℃)	5~+55
Storage temperature (℃)	0~+65
Power supply (V)	6~12 DC
Power (W, power supply 6V)	2
Communication interface	RS-422
Physical characteristics
Size (mm×mm×mm)	40*40*42( with shell)/27*26*34(without shell and baseboard)
Weight (g)	80g(with shell)/ 40g(without shell and baseboard)

 Wiring Definition

Connect Type	Pin	Definition
J30J-15ZKP	1	+6~12V
	3	GND
	6	Tx+
	7	Tx-
	8	Rx+
	9	Rx-
	10	GND

 Dimension

Data protocols

Upper computer receiving protocol

The data update rate is 100Hz, the baud rate is 230400bps, and each frame contains 61 bytes of data, each byte contains 1 start bit (0), 8 data bits, 1 stop bit (1), and no parity. The specific data format is shown in the table below:

Table 1 Receive data frame format

Bytes (60 bytes total)	Data content	supplementary note
1~4	header	EB8055AA
5~8	X Gyro Data	Low then high, dimensionless digital FLOAT
9~12	Y gyro data	Low then high, dimensionless digital FLOAT
13~16	Z Gyro Data	Low then high, dimensionless digital FLOAT
17~20	X ACCL data	Low then high, dimensionless digital FLOAT
21~24	Y ACCL data	Low then high, dimensionless digital FLOAT
25~28	Z ACCL data	Low then high, dimensionless digital FLOAT
29~32	Lon	Low then high, 0.000001°.
33~36	Lat	Low then high, 0.000001°.
37~40	Alt	First low, then high, 0.000001m
41~44	count	Low then high, 10ms
45~46	pit	Low then high, 0.01°
47~48	rol	Low then high, 0.01°
49~50	yaw	Low then high, 0.01°
51~52	North speed	First low then high, 0.01m/s
53~54	up speed	First low then high, 0.01m/s
55~56	east speed	First low then high, 0.01m/s
57	state	0xA1 alignment, 0xB1 hold
58	end of frame	0x00
59	end of frame	0xFF
60	end of frame	0x34
61	matching test	EB 80 and the sum of all bytes other than itself

Host computer sending protocol

Total number of bytes sent down in a single transmission: 21 bytes, baud rate 230400bps, no parity, each byte includes: start bit (0), data bit (8 bits), stop bit (1).

1. Priming

byte symbol	define	note
1	0xEB
2	0x80
3	0x00
4	0xCC
5-8	0x00
9-12	0x00
13-16	0x00
17-21	0x00

2. Send warp and woof height

byte symbol	define	note
1	0xEB
2	0x80
3	0x00
4	0xAA
5-8	lon
9-12	lat
13-16	alt
17	0xAA
18	0xBB
19	0xCC
20	0xDD
21	5~20 heterodyne calibration

Determine the definition of the data sent based on byte 4:

1. if control_flag==0xCC: restart work
2. if control_flag==0xAA: send latitude/longitude altitude

Send order: 5-8 bytes: latitude (*1e6 in °)

9-12 bytes: longitude (*1e6 in °)

13-16 bytes: height (*1 in m)

For example, the C code that sends the latitude/longitude instruction (the rest of the bytes are configured arbitrarily), Latitude is "latitude * 1e6", longitude is similar, and altitude scale is 1.

bytSend[0] = 0xeb;

bytSend[1] = 0x80;

bytSend[2] = 0x00;

bytSend[3] = 0xaa;

bytSend[4] = (Latitude>>24) & 0xff;

bytSend[5] = (Latitude>>16) & 0xff;

bytSend[6] = (Latitude>>8) & 0xff;

bytSend[7] = (Latitude) & 0xff.

bytSend[8] = (Longitude>>24) & 0xff;

bytSend[9] = (Longitude>>16) & 0xff;

bytSend[10] = (Longitude>>8) & 0xff;

bytSend[11] = (Longitude) & 0xff.

bytSend[12] = (Altitude>>24) & 0xff;

bytSend[13] = (Altitude>>16) & 0xff;

bytSend[14] = (Altitude>>8) & 0xff;

bytSend[15] = (Altitude) & 0xff;

bytSend[16] = 0xaa;

bytSend[17] = 0xbb;

bytSend[18] = 0xcc;

bytSend[19] = 0xdd;

bytSend[20] = b[4]^b[5]^... .b[19];

Introduction to the software

Click the COMCFG button to set the serial port, baud rate and frequency. The baud rate is 230400 and the frequency CAL is 100HZ.

Click Open to start the test.

Click Initial Align to start the north search, the search time is 300s.The result is displayed at PIT;YAW;ROL.

If you want to change the latitude and longitude, please change them at Lon0 and Lat0, then click Load, and then click Initial Align to re-navigate.

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.

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Application Techniques

1.Why can MEMS north finders become the revolutionary orienteering in the era of miniaturization?

2.How important is the North Seeker in the field of oil、mining and drilling?

3.ER-MNS-09 MEMS directional module: a precise tool for revolutionizing drilling technology

4.Precision without boundaries! ER-MNS-05 MEMS North Finder defines new mining standards

5.OEM customization, easy integration! The North Seeker helps operations in multiple fields to be more accurate and efficient!

6.Efficient mining, north seeker assists mining drilling operations

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