Gyrosens is a professional manufacturer and OEM/ODM provider of inertial sensors and navigation solutions since 2008.

GSGYR101F Single-Axis FOG

GSGYR101F is a digital closed-loop FOG delivering bias <0.5°/h, random walk <0.02°/√h, and scale nonlinearity <20ppm. The 60×35×31mm, 120g package achieves 3-second startup and ≥500Hz bandwidth via RS422 interface. Designed for gimbal cameras, flight control platforms, and INS/IMU systems requiring reliable single-axis angular rate sensing with quick deployment and stable performance.

Feature:

● High reliability
● Short startup time
● Wide operating temperature range
● Support RS422 or RS485 interface
● Low power consumption
● Small size and light weight

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Product Introduction

This product is an inertial angular rate sensor based on optical Sagnac effect, which is used to measure the rotation angular speed of the carrier along the direction of the sensitive axis. The digital closed-loop detection circuit is used to extract the optical path difference of the optical fiber loop sensitive by the external physical angular velocity. At the same time, the optical path difference signal is converted into the voltage signal for signal modulation and demodulation, and the closed-loop feedback and control are realized to achieve the purpose of real-time angular velocity signal detection.

This product is composed of optical angular velocity sensitive unit and signal detection, providing single-axis Angle increment information and internal temperature information.

Constituent part:

● Optical path unit (including SLD light source, fiber ring, integrated optical phase modulator, fiber coupler, photodetector).

● Circuit unit (light source driving circuit, signal detection and control circuit).

● Mechanical structure.

Interface Specification

Num	Define	Explain	Num	Define	Explain
1	+5V	Power input	6	+5V	Power input
2	GND	Power ground	7	GND	Power ground
3	Reserved Bits		8	RXD-	Receive Data-
4	RXD+	Receive Data+	9	TXD-	Transmit Data-
5	TXD+	Transmit Data+

Dimensions

3 (23)

Unit: mm

Case size(mm): 64±0.1×60±0.1×40±0.1(L*W*H )

Installation Dimension(mm): 57±0.1×53±0.1, mounting holeΦ3.5×4

Communication protocol

● Communication interface: RXD and TXD are RS422/485 differential communication interface, RXD is used to receive differential pulse (or square wave) synchronous communication signal selection, TXD is used for serial data signal output.

● Communication protocol: The gyro locks the internal Angle increment data after receiving the selected communication number drops, and starts to output the gyro data packet within 1μs through TXD. The transmission baud rate is 460.8kbps. The data packet contains 17 bytes, and each byte contains 1 start bit, 8 data bit, and 1 stop bit.

The Angle increment information is the Angle increment value of the gyroscope in the time between the two selection signals. The average angular velocity of the gyroscope is obtained by dividing the accumulated value of the Angle increment in a period of time by this interval.

The packet format is as follows:

Num	Explain
1	99 (hex)
2	66 (hex)
3	Status word, normal value is FF (hex)
4	Gyro Angle increment 1, LSB
5	Gyro Angle increment 2
6	Gyro Angle increment 3
7	Gyro Angle increment 4, MSB
8	Temperature data, LSB
9	Temperature data, MSB
10	Frame number, plus one for every send, cycle count
11	Checksum, the sum of bytes 3 to 16

Status word

Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0
Reserved Bits	Reserved Bits	Reserved Bits	Circuit control status	Reserved Bits	Reserved Bits	Reserved Bits	Optical path status

Note: The reserved bit is always 1;

When the "circuit control state" bit is 1, it means that the gyro circuit control state is normal, and when it is 0, it means that the control state is abnormal.

If the Optical path Status bit is 1, the gyro optical path is working normally. If the optical path status is 0, the gyro optical path is abnormal.

If any of the above two status bits is often 0 during the use of the gyroscope, and there are anomalies in the gyroscope data, the gyroscope should be repaired.

Product installation and disassembly

Requirements:

The user is responsible for the installation and disassembly of the product, in this process, the product can not be impacted, knocked and bumped, and the external surface of the product can not be machined.

Steps:

● The surface flatness required for fixing the product is better than 0.02mm;

● It is recommended to evenly coat the bottom of the product with a layer of 0.2 ~ 0.5mm thick thermal silicone during product installation;

● It is recommended to place an aluminum plate (larger than the product size) under the product mounting surface during product testing;

● The magnetic field strength of the product installation position is not greater than 1 Gauss.

Check:

Check whether the mounting screws conform to the dimensions of the mounting holes and are secure.

Standard operating procedures

Check before use:

Check the appearance of the product for physical damage such as collision.

Product usage instructions:

a) Install the product on the carrier, and connect the cable correctly according to the requirements in Table 3;

b) Data connection shall be made according to the communication protocol in 2.6.3.

Note:

● The gyroscope should not be operated frequently during use, so as not to damage the performance of the gyroscope and reduce the service life of the gyroscope;

● The power supply system should be checked before the gyroscope is powered on to ensure that there is no short circuit between the electrical points of the power supply and between the gyroscope shell and the electrical points;

● If the product works abnormally, the manufacturer should be consulted, and it is prohibited to disassemble and repair it without authorization;

● Fiber optic gyroscope is a precision instrument, and should be handled gently during use and transportation;

● Ensure that the product input and output signal lines and power supply power lines are correctly connected;

● Require anti-static measures to be taken during contact with the product;

● The magnetic field strength around the location of the product should be less than 10 gauss.

Maintenance

Before the product is loaded into the carrier, the product is required to be energized at least once every 6 months, and the power-on time is 3600s. The power-on time is not required to test the electrical parameters of the product.

After the product is loaded into the carrier, it is required to be energized at least once a year, and the power-on time is 3600s, and the electrical parameters of the product are not required to be tested when energized.

Common fault phenomena and troubleshooting methods

This product is in a sealed state, and can not be repaired on-site after any failure of the user, and needs to be returned to the production unit for maintenance.

The following can only list some possible fault phenomena other than the product itself, see Table 6. If the product has other technical problems during use, please contact the product manufacturer.

Common faults and troubleshooting methods:

Num	Fault	Reason	Troubleshooting methods
1	The product is powered +5V, and the ammeter indicates basically zero.	The product is not powered or the current is too small.	Check the power supply and power supply loop, and restore the power supply.
2	The product is powered +5V, the ammeter indicates normal, but the computer acquisition program does not work.	The test device collection system is abnormal.	Check the connection cables and the power supply of the device.
2		Software program conflict	Restart the computer

Transportation and storage requirements

Transportation precautions:

● Place the product in the direction indicated in the packing box;

● Transport by road, rail, air and water is permitted;

● Ensure that the packing box is fastened to the carrier and will not move during transportation.

Storage conditions, storage period and precautions:

● The products placed in the packing box should be stored in an air-conditioned warehouse under standard atmospheric pressure conditions, with an ambient temperature of 25 °C ±10 °C, relative humidity of 30% ~ 50%, and the surrounding magnetic field strength less than 10 Gauss;

● The product storage period is 15 years.

Precautions for unpacking:

● Check the appearance of the outer package for physical damage such as collision;

● Check whether the products and supporting accessories are complete.

● Electrostatic protection should be carried out when taking out the product.

Technical Specifications

Parameter	GSGYR101F
Number of Axles	1
Power Voltage	+5V DC
Power 25°C	<2.5W
Power -45°C～+70°C	<4W
Supply current	>1.5A
Output	RS422
Size	60×35×31mm
Run-up time	3s
Bias	<1°/h
Bias stability 25°C (Smoothing time: 10s default)	<0.5°/h
Bias temperature sensitivity 1°C/min (Smoothing time: 100s default)	<1°/h
Bias repeatability	<0.3°/h
Random walk	<0.02°/√h
Scale factor nonlinearity	<20ppm
Scale factor asymmetry	<10ppm
Scale factor repeatability	<20ppm
Threshold	<0.2°/h
Resolution	<0.2°/h
Bandwidth	≥500Hz
Weight	120g±10g
Dynamic range	±500°/s
Start-up Current	<1.5A
Operating temperature	-45°C～+70°C
Storage temperature	-55°C～+80°C
Supply voltage accuracy	<±5%
Power ripple	<50mV