SNC500A High Precision Integrated Navigation System

Product overview
SNC500A fiber integrated navigation system is based on high-precision closed-loop fiber optic gyroscope, accelerometer and high-end GNSS receiving board, through multi-sensor fusion and rotation modulation navigation solution algorithm, to provide high-precision attitude, speed and position information, to meet the requirements of high-precision measurement and control.

1. Product features
▶ With swinging base/moving base alignment function
▶ High precision self-north finding without external movement requirements
▶ GNSS/ odometer /DVL and other multi-information integrated navigation
▶ Long time accuracy retention without external information assistance
▶ Self-detection ability

2. Main application areas
▶ Large UAV benchmark INERTIAL navigation
▶ Marine compass
▶ Positioning orientation
▶ Underwater platform (AUV, ROV, etc.)
▶ Intelligent mining machinery

Working principle
The inertial measurement unit in the INERTIAL navigation system uses three high-precision fiber optic gyroscopes with orthogonal configuration to detect the angular motion of the carrier and output digital signals proportional to the angular velocity of the carrier. Three orthogonal configuration of quartz flexible accelerometer sensitive carrier line acceleration, output proportional to its current signal, the current signal through the conversion circuit into digital signal. The INERTIAL Measurement unit outputs angular velocity and acceleration information.

The inertial measurement unit (IMU) is installed on the rotating mechanism and rotates with the rotating mechanism.
The GNSS board receives the satellite information, solves the navigation and positioning, and sends the navigation result to the navigation computer.

The navigation computer can receive the data of gyroscope, accelerometer and GNSS, calculate the system error compensation and solve the navigation, and send real-time navigation information such as speed, position and attitude through the interface circuit in a specified period.

The inertial navigation system has the function of self-north finding based on compass effect, which can measure the heading value marked by the inertial navigation system. In addition, the horizontal attitude Angle is calculated based on the static base state or reference velocity according to the measured values of the accelerometer and gyroscope.

4. Performance indicators

Project	Test conditions	A0 index		B0 index
Positioning accuracy	GNSS valid, single point	1.2m（RMS）		1.2m（RMS）
	GNSS valid, RTK	2cm+1ppm（RMS）		2cm+1ppm（RMS）
	Positioning hold (GNSS failure)	1.5nm/h（50%CEP）， 5nm/2h（50%CEP）		0.8nm/h（CEP）， 3.0nm/3h（CEP）
Heading accuracy	Pelf seeking north	0.1°×Sec (lati), lati is latitude (RMS), 10min		0.06°×Sec (lati), static base alignment for 5min;0.03°×Sec (lati), static base alignment for 10min;Where lati is latitude (RMS)
	Pourse hold (GNSS failure)	0.05°/h（RMS）， 0.1°/2h（RMS）		0.02°/h（RMS）， 0.05°/3h（RMS）
Attitude accuracy	GNSS valid	0.03°（RMS）		0.01°（RMS）
	Attitude hold (GNSS failure)	0.02°/h（RMS）， 0.06°/2h（RMS）		0.01°/h（RMS）， 0.03°/3h（RMS）
Speed accuracy	GNSS valid, single point L1 / L2	0.1m/s（RMS）		0.1m/s（RMS）
	Speed hold (GNSS failure)	2m/s/h（RMS）, 5m/s/2h（RMS）		0.8m/s/h（RMS）, 3m/s/3h（RMS）
Fiber optic gyroscope	Measuring range	±400°/s		±400°/s
	Zero bias stability	≤0.02°/h		≤0.01°/h
Quartz flexible accelerometer	Measuring range	±20g		±20g
	Zero bias stability	≤ 50 µ g (10s average)		≤ 20 µ g (10s average)
Communication interface	RS422	6The baud rate is 9.6kbps ~ 921.6kbps, the default is 115.2kbps, the maximum frequency is 1000Hz (original data), and the default is 200Hz
	RS232	1The baud rate is 9.6kbps ~ 921.6kbps, the default is 115.2kbps, the maximum frequency is 1000Hz (original data), and the default is 200Hz
Electrical characteristics	Voltage	24～36VDC
	Power waste	≤30W
Structural characteristics	Size	199mm×180mm×219.5mm
	Weight	6.5kg	≤ 7.5kg (non aviation) ≤ 6.5kg (aviation optional)
Use environment	Working temperature	-40℃~+60℃
	Storage temperature	-45℃~+65℃
	Vibration (with damping)	5~2000Hz，6.06g
	Impact (with damping)	30g，11ms
Reliability	life	>15 years
	Continuous working time	>24h