FS40L1 Single-Axis Medium-Low Precision Silicon Photonic Gyroscope

 

 

 

• EO Pod
• Flight Control Platform
• Optical/Photography Platform
• Platform Stabilization Device
• SatCom-on-the-Move
• Inertial Measurement Unit
• Lightweight UAV

 

 

The FS40L1 silicon photonic gyroscope breaks through traditional FOG design with a silicon photonic integrated optical circuit. It is an ideal medium-low precision angular rate sensor for navigation and control, widely used in inertial measurement applications. Based on proven designs with engineering optimizations for mass production, it delivers exceptional cost performance. Featuring compact size, light weight, low power consumption, and a simple interface, it offers significant advantages across navigation and control fields.

 

 

Company is a high-tech enterprise that achieves full closed-loop integration from fiber winding equipment, fiber coil winding, fiber optic gyroscopes, fiber inertial products, MEMS inertial products, IMU circuits, software, to IMU test and calibration equipment. Through comprehensive control of upstream and downstream processes, product quality is effectively improved and system costs are reduced. Meanwhile, the company implements the ISO9001 quality system and adopts strict processes to ensure product performance reliability and consistency.

 

 

FS40L1 Single-Axis Silicon Photonic Gyroscope Performance Parameters

Parameter	A	B	C
Bias Stability (°/h ,1σ, 10s)	≤0.8	≤0.6	≤0.3
Bias Repeatability (°/h ,1σ)	≤0.8	≤0.6	≤0.3
Random Walk Coefficient (°/√h)	≤0.1	≤0.08	≤0.03
Scale Factor Non-linearity (ppm)	≤200	≤200	≤200
Scale Factor Repeatability (ppm)	≤200	≤200	≤200
Dynamic Range (°/s)	±500
Magnetic Field Sensitivity (°/hr/Gs)	≤0.05
Operating Temperature (℃)	-40 ～ +65
Storage Temperature (℃)	-50 ～ +70
Vibration Condition (g, Hz)	4.2, 20 ～ 2000
Weight (g)	65±5
Dimensions (mm)	40*40*17

 

 

 

 

As a new type of fully solid-state gyroscope, the fiber optic gyroscope features fast start-up, wide measurement range, and high reliability. The FS40L1 medium-to-low precision FOG is applicable to land positioning and orientation, vehicle-mounted north seekers, airborne attitude and heading reference systems (AHRS), marine gyrocompasses, and other medium-to-high precision inertial navigation system (INS) applications.

 

1.1 Scope of Application

This manual applies exclusively to the FS40L1 product and includes performance specifications, technical conditions, outline dimensions, and installation and usage instructions. The technical conditions cover the product's environmental range, electrical performance, and physical characteristics.

 

1.2 Main Parameters

1.2.1 Main FOG Performance Specifications:

Table 1 Main Product Performance Specifications

Parameter	A	B	C
Bias Stability (°/hr, 1σ, 10 s)	≤0.8	≤0.6	≤0.3	2 hr continuous test, 10 s smoothing result
Bias Repeatability (°/hr, 1σ)	≤0.8	≤0.6	≤0.3	Calculated from 6 test data sets
Random Walk Coefficient (°/√hr)	≤0.1	≤0.08	≤0.03
Scale Factor Nonlinearity (ppm)	≤200	≤200	≤200	Room temperature
Scale Factor Asymmetry (ppm)	≤200	≤200	≤200	Room temperature
Scale Factor Repeatability (ppm)	≤0.8	≤0.6	≤0.3	Room temperature
Dynamic Range (°/s)	±500
Magnetic Field Sensitivity (°/hr/Gs)	≤0.05
Bandwidth (Hz)	＞200
Power Consumption (W, Room temp.)	＜2
Operating Temperature (℃)	-40～+65
Storage Temperature (℃)	-50～+70
Vibration Conditions (g, Hz)	4.2,20～2000
Dimensions (mm)	ϕ40*17
Weight (g)	65±5

 

1.2.2 Mechanical Testing

1.2.2.1 Sine Sweep Vibration

The FOG is mounted on a vibration table via a fixture according to the vibration direction. Sine sweeps are performed in three directions, corresponding to the X, Y, and Z axes respectively. Vibration procedure: energize the vibration table, power on the FOG, and after a preheating period (FOG start-up time), measure the FOG output for approximately 5 min; then perform sine vibration. Vibration conditions: 20 Hz–2000 Hz, sweep duration 5 min, amplitude 4.2 g. Record the FOG output during the vibration process.

Figure 1 Vibration Spectrum

 

 

 

The FOG shall exhibit no resonance during sine sweep from 20 Hz to 2,000 Hz;

Random vibration: the absolute value of the difference between the bias during vibration and the average of pre- and post-vibration bias shall be less than 1 °/h.

 

1.2.2.2 Mechanical shock shall comply with the requirements of Table 2.

Table 2 Shock Test Conditions

Peak Acceleration (g)	30
Duration (ms)	10
Number of Shocks	3 shocks per direction
Waveform	Half-Sine Wave
Direction	X, Y, Z
Note: The interval between two consecutive shocks shall not be less than 1.5 s.

During the shock test, the product shall remain powered on. After completion of mechanical shock, the product shall operate normally, and the bias change before and after shock shall be less than 1 °/h.

 

2 Communication Protocol

2.1 RS-422 Mode (Bidirectional)

Bidirectional serial communication, compliant with the RS-422 interface standard;

External trigger signal: 1,000 Hz square wave;

Data transmission begins after the FOG detects the falling edge of the external trigger signal;

Gyro valid data: 32 bits;

Temperature valid data: 14 bits;

Data transmission baud rate: 460.8 kbps;

Data format:

Data transmission format: each data frame consists of 11 bits - Bit 1: Start bit (0); Bits 2–9: Data bits; Bit 10: Even parity bit; Bit 11: Stop bit;

Parity mode: Even parity;

Gyro valid data: 32 bits (MSB is the sign bit, 0 = "+", 1 = "-"); Temperature valid data: 14 bits (MSB is the sign bit, 0 = "+", 1 = "-");

Data packet format: each transmission consists of 10 bytes. Byte 1: Frame header (80H); Byte 2: Gyro data byte 1 (low byte); Byte 3: Gyro data byte 2; Byte 4: Gyro data byte 3; Byte 5: Gyro data byte 4; Byte 6: Gyro data byte 5 (high byte); Byte 7: Check byte, XOR value of the first 5 bytes (gyro data) in the packet; Byte 8: Temperature data low byte; Byte 9: Temperature data high byte; Byte 10: Check byte, XOR value of the first 8 bytes in the packet;

Data storage method.

Figure 2 FS40L1 Outline Dimension Drawing

 

The FOG is equipped with an external J63A-212-009-161JC connector. The pin definitions are provided in Table 1.

Table 1 Gyro Output Connector Electrical Characteristics

Pin No.	Pin Definition	Marking	Remarks
1	Serial Port T+	TX+
2	Serial Port T-	TX-
3	Serial Port R+	RX+	RS-422 RX+, Trigger Signal +
4	Serial Port R-	RX-	RS-422 RX-, Trigger Signal -
6, 7	Power +5 V	+5V
8, 9	Power Ground	GND

 

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