MTG300A MEMS Gyro

 

 

 

Satellite stabilization and attitude control

 

 

The MTG300A MEMS three-axis gyro assembly is a high-reliability, cost-effective 3-axis MEMS gyro assembly, applicable to navigation and control fields of low-to-medium Earth orbit satellites. Assembly integrates high-performance MEMS gyroscopes inside an independent mechanical housing. The built-in gyroscopes adopt domestically manufactured MEMS inertial sensor technology reaching advanced industry level.The three-axis MEMS gyroscope senses the angular motion of the carrier. Full-temperature compensation for Bias, scale factor and non-orthogonality error is implemented inside the system, enabling sustained high measurement accuracy during long-term operation.

 

 

Company is a high-tech enterprise with full closed-loop capabilities from fiber winding to FOGs, fiber/MEMS inertial products, IMU circuits, software, and test equipment. End-to-end process control improves quality and reduces costs. Operating under ISO9001, it ensures reliability and consistency. INS plays a critical role in intelligent coal mining, with FOG as the key component.The MTG300A MEMS three-axis gyro assembly adopts an aluminum alloy mechanical housing, featuring light weight, high structural strength, and outstanding vibration & shock resistance.

 

 

Parameter	Technical Index
Gyroscope
Measurement Range (°/s)	±100
Full-Temperature Bias (°/h)	≤5
Bias Stability (°/h, 10s averaging window)	≤0.1
Bias Stability (°/h, 100s averaging window)	≤0.05
Bias Instability (°/h, Allan variance method, typical)	≤0.02
Bias Repeatability (°/h)	≤0.1
Angular Random Walk (°/√h)	≤0.005
g-Dependent Drift (°/h/g)	≤0.5
Scale Factor Nonlinearity (ppm)	≤150
Bandwidth (Hz)	≥12
Electrical & Mechanical Interfaces
Supply Voltage (V)	5~12 (ripple ≤100 mV)
Power Consumption (W)	≤1.5
Startup Time (s)	≤2
Communication Interface	1 channel RS-422
Data Update Rate	Polling response output, max. 200 Hz
Overall Dimension (mm×mm×mm)	44.8×38.6×21.5
Weight (g)	≤60
Operating Environment
Operating Temperature (℃)	-40 ~ 85
Storage Temperature (℃)	-55 ~ 85
Vibration	7.72 g (RMS)
Shock	500 g / 1 ms pulse

 

 

 

 

Product Brief

The MTG300A MEMS three-axis gyro assembly is a high-reliability, cost-effective 3-axis MEMS gyro assembly, applicable to navigation and control fields of low-to-medium Earth orbit satellites. The MTG300A series MEMS three-axis gyro assembly integrates high-performance MEMS gyroscopes inside an independent mechanical housing. The built-in gyroscopes adopt domestically manufactured MEMS inertial sensor technology reaching advanced industry level. All electronic components inside the system are 100% domestically sourced. The three-axis MEMS gyroscope senses the angular motion of the carrier. Full-temperature compensation for Bias, scale factor and non-orthogonality error is implemented inside the system, enabling sustained high measurement accuracy during long-term operation.

 

Product Features

• 100% domestically sourced electronic components
• Compact outline, light weight and low power consumption
• Full-temperature calibration and compensation ranging from -40℃ to +80℃
• 2 kHz high-speed sampling
• Excellent resistance to severe mechanical environments
• Support for in-field software upgrade

 

Application Fields

• Satellite stabilization and attitude control

 

 

Table 1 Performance Parameters of MTG300A MEMS Three-Axis Gyro Assembly

Parameter	Technical Index
Gyroscope
Measurement Range (°/s)	±100
Full-Temperature Bias (°/h)	≤5
Bias Stability (°/h, 10s averaging window)	≤0.1
Bias Stability (°/h, 100s averaging window)	≤0.05
Bias Instability (°/h, Allan variance method, typical)	≤0.02
Bias Repeatability (°/h)	≤0.1
Angular Random Walk (°/√h)	≤0.005
g-Dependent Drift (°/h/g)	≤0.5
Scale Factor Nonlinearity (ppm)	≤150
Bandwidth (Hz)	≥12
Electrical & Mechanical Interfaces
Supply Voltage (V)	5~12 (ripple ≤100 mV)
Power Consumption (W)	≤1.5
Startup Time (s)	≤2
Communication Interface	1 channel RS-422
Data Update Rate	Polling response output, max. 200 Hz
Overall Dimension (mm×mm×mm)	44.8×38.6×21.5
Weight (g)	≤60
Operating Environment
Operating Temperature (℃)	-40 ~ 85
Storage Temperature (℃)	-55 ~ 85
Vibration	7.72 g (RMS)
Shock	500 g / 1 ms pulse

 

 

Structural Characteristics

The MTG300A MEMS three-axis gyro assembly adopts an aluminum alloy mechanical housing, featuring light weight, high structural strength, and outstanding vibration & shock resistance. The outline dimensions of the unit are shown in Figure 1, and the unit is fixed with 3 M4 screws.

Figure 1 Outline Dimensions

 

Product Marking and Coordinate Polarity

During installation, the carrier coordinate system of the product shall maintain a fixed geometric relationship with the carrier coordinate system of the host equipment. The carrier coordinate system definition of the MTG300A MEMS three-axis gyro assembly is specified as follows.

 

Figure 2 Product Coordinate System

 

Pin Assignment

The external output connector of the MTG300A MEMS three-axis gyro assembly is J30J-15ZK (mating connector: J30J-15TJL), which provides power supply and external communication for the unit. The pin definitions of the connector are listed in Table 2.

Table 2 External Pin Assignment of MTG300A MEMS Three-Axis Gyro Assembly Connector

Pin No.	Definition	Remarks
7, 8	POWER_IN	5±0.2 V power input
15	GND
10	RS422 R+	RS422 Interface
2	RS422 R-
9	RS422 T+
1	RS422 T-
3, 12, 13	GND

After the supply voltage drops below the device operating threshold, the power-off holding time t_OFF before re-powering shall not be less than 3 seconds. Insufficient power-off interval will lead to abnormal startup, latch-up or initialization failure of the device.

External Communication Interface

3.4.1 WXGYRO-EB90 Protocol

Data Link Layer

Transmission complies with UART Idle-Line mode, and the frame format of SCI bus is defined as below. The basic transmission unit is a character, with 11 bits per character.

Figure 3 Data Transmission Format

 

Under Idle-Line transmission mode, each frame occupies 1 byte and all frames are treated as data frames. One SCI data frame is 1 byte (8 bits). The bus remains logic high during idle state. All SCI frames start with a logic-low start bit, followed by frame data transmitted with Least Significant Bit First (LSB First). Detailed frame definition:

• Start bit: 1 bit
• Data bits: 8 bits (b0~b7)
• Stop bit: 1 bit
• Parity bit: Odd parity
• Baud rate: 115200 bps
• For multi-byte transmission, high byte is transmitted prior to low byte by default.

 

Application Layer

Single Unit Telemetry Data Format

Single unit telemetry data is the response data of each component/module after receiving telemetry request commands from the On-Board Computer (OBC). The detailed format is shown in the table below.

Table 4 Single Unit Telemetry Data Format

Byte Index	Definition	Description
B0, B1	Frame Header	Fixed value: 0xEB90
B2, B3	Payload Length	Note 1
B4	Telemetry Data Classification ID	Note 2
B5	Telemetry Request Command Counter	Note 3
B6	Valid Command Counter	Note 4
B7	Invalid Command Counter	Note 5
B8	Latest Executed Command Code	Note 6
B9 ~ B(N-1)	User-Defined Payload	Note 7
BN	Checksum	Note 8
Note: The gyro assembly only supports telemetry request commands without other control commands, so Bytes B6, B7, B8 shall be filled with 0xFF.

 

• Note 1: Payload Length. Total byte count ranging from Telemetry Data Classification ID (inclusive) to Checksum (inclusive).
• Note 2: Telemetry Data Classification ID. Shall be consistent with the corresponding field in the telemetry request command.
• Note 3: Telemetry Request Command Counter. 1 unsigned byte, increments by 1 upon receiving the matching telemetry request frame sent by the OBC.
• Note 4: Valid Command Counter. 1 unsigned byte, increments by 1 upon receiving a complete valid command excluding telemetry request frames (validated by checksum). Fill with 0xFF for units without remote control commands.
• Note 5: Invalid Command Counter. 1 unsigned byte, counts abnormal received data including wrong frame header, checksum error, unrecognized command code, etc. Fill with 0xFF for units without remote control commands.
• Note 6: Latest Executed Command Code. 1 unsigned byte, records the code of the latest control command (excluding telemetry request and broadcast messages). This field is updated immediately after command verification passes (not after command execution succeeds). If command verification fails, errors shall be indicated via Invalid Command Counter in user-defined payload; fill with 0xFF for units without remote control commands.
• Note 7: User-Defined Payload. Bytes B9 ~ B(N-1), customizable based on user requirements.
• Note 8: Checksum. Unsigned cumulative sum of all bytes (B0+B1+B2+…+B(N-1)), retain the lower 8 bits for this byte.

The telemetry response data shall be output within 2 ms after receiving a telemetry request command; otherwise, the communication shall be judged as timeout.

 

Single Unit Telecommand Format

Telemetry Request Command

The telemetry request command is a data frame sent by the OBC to acquire telemetry packets from each unit, transmitted once per second by default. Separate sampling frequencies are specified for telemetry packets requiring special acquisition rates. The telemetry request format is shown below.

Table 5 Telemetry Request Data Format

B0	B1	B2	B3	B4	B5	B6	B7
EB	90	TMT	00	00	00	00	SUM

Telemetry Data Classification ID (TMT): Identifies the type of returned telemetry data. Set to 0xFF if only one type of telemetry exists. For multiple telemetry types: Type 1 = 0xFF, Type 2 = 0xFE, Type 3 = 0xFD, and so on. This field in telemetry response frames must match the corresponding field in telemetry request frames for each telemetry type.

SUM: Checksum. Unsigned cumulative sum of B0~B6, retain the lower 8 bits for this byte.

Note: Byte B2 is fixed as 0xFF.

 

Single Unit Telemetry Response Data

Upon receiving a telemetry request command, telemetry data shall be transmitted in the format specified in the table below:

Table 6 Gyro Output Telemetry Data

Byte Index	Definition	Description
B0, B1	Frame Header	Fixed value: 0xEB90
B2, B3	Payload Length	0x0024
B4	Telemetry Data Classification ID	0xFF
B5	Telemetry Request Command Counter	Increments by 1 upon receiving a telemetry request command
B6	Valid Command Counter	Increments by 1 upon receiving a valid telecommand
B7	Invalid Command Counter	Increments by 1 upon receiving an erroneous telecommand
B8	Latest Executed Command Code	Command code of the latest executed telecommand
B9~B12	X-Axis Gyro Data	Unit: °/s, scale factor = 1×10⁻⁵, range: -500 ~ 500
B13~B16	Y-Axis Gyro Data
B17~B20	Z-Axis Gyro Data
B21~B22	X-Axis Gyro Temperature	Unit: ℃, scale factor = 1×10⁻², range: -128 ~ 128
B23~B24	Y-Axis Gyro Temperature
B25~B26	Z-Axis Gyro Temperature
B27~B30	Status Word	Data type: uint32
B31~B34	Reserved Field
B35~B38	Operation Time	Device power-on operating time, unit: ms
B39	Checksum	Lower 8 bits of the cumulative sum of bytes B0 to B38

 

Product Operation Precautions

• Strictly follow the electrical pin assignment of the product during wiring to avoid misconnection.
• This product is a precision inertial measurement device. Avoid shocks, collisions and mechanical loads exceeding its rated tolerance during handling.
• Mounting flatness imposes significant influence on angular rate measurement. A high-flatness mounting plane is required to eliminate installation misalignment errors.
• Mount the product firmly and reliably to prevent measurement errors induced by loose installation.
• Take anti-static protection during installation and operation; anti-static wrist strap is recommended.
• Operate strictly in accordance with the specifications of this manual and verify that the ambient conditions match the operating requirements. Do not disassemble the housing or modify internal structures if faults occur. Contact our technical support engineers promptly for troubleshooting.

 

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