Headquarters Address: Building 3, Science and Technology Innovation Park, No. 311 Yanxin Road, Huishan District, Wuxi City
Email: sales@witlink.cn
Phone: 0510-83880511
Website: www.witlink.cn
Main characteristics：The NF200 small volume fiber optic gyroscope north finder is mainly composed of fiber optic gyroscope, accelerometer, mechanical rotating device, and signal solving circuit. By utilizing high-precision fiber optic gyroscopes to sense the Earth's rotational angular velocity and accelerometers to sense the gravity acceleration component with tilt compensation, the true north azimuth of the carrier can be quickly and autonomously determined. The north finder has the characteristics of compact structure, light weight, high measurement accuracy, strong environmental adaptability, high reliability, fast directional speed, and high degree of automation.
1. Introduction
The NF200 small volume fiber optic gyroscope north finder is mainly composed of fiber optic gyroscope, accelerometer, mechanical rotating device, and signal solving circuit. By utilizing high-precision fiber optic gyroscopes to sense the Earth's rotational angular velocity and accelerometers to sense the gravity acceleration component with tilt compensation, the true north azimuth of the carrier can be quickly and autonomously determined.
The north finder has the characteristics of compact structure, light weight, high measurement accuracy, strong environmental adaptability, high reliability, fast directional speed, and high degree of automation.
2. Performance parameters
Parameter | index | |
Power supply | working voltage | 12V (default), 9-28V |
consumption | <6W (instantaneous peak<15W) | |
Performance index | Way of working | static state | |
Digital output mode | RS232 (default), RS422 optional | ||
North search time | <3min | ||
Pitch and roll | measuring range | ±8° | |
measurement accuracy | ±0.1°(RMS) | ||
Azimuth | measuring range | 0~360° | |
measurement accuracy | 0.2 °, 0.3 °, 0.5 °, 1 ° optional (RMS) | ||
| operation temperature | -40~+65℃ | |
storage temperature | -45~+85℃ | ||
vibrate | 5~5.5Hz，25.4mm 5.5Hz~200Hz | ||
1.5g (RMS)； Direction: Installation direction | |||
Time: 12 minutes; Cycle times: 3 times. | |||
impact | 10g, 11ms, half sine wave, direction: installation direction, frequency: 3 times | ||
Physical property | external dimensions | Length * Width * Height: 115mm * 90mm * 110mm | |
weight | <2.5Kg | ||
3. Communication Protocol
Data rate: 9600bit/s. 1 start bit, 8 data bits, no checksum, 1 stop bit, a total of 10 data bits.
3.1 Input Data Format:
Explanation: The input data includes: frame header, latitude, confirmation instruction, a total of 10 bytes, specifically:
4. Installation method and size
Facing the north finder arrow, the left and right sides of the installation base plate are the installation reference surfaces. Align the reference surface with the installation head and tail lines of the carrier, and use three
The M4 screw can fix the gyroscope north finder on the carrier.
5. Use and maintenance
If the startup current of the gyroscope north finder is found to be greater than 1A during use, the power supply voltage should be checked to ensure it meets the requirements. If the inspection is correct, professional personnel should be hired for maintenance.
5.2 If no serial data output is found during the use of the gyroscope north finder, the wiring should be checked for correctness, and the serial port settings and data reception format should be checked for correctness. If the inspection is correct, professional personnel should be hired for maintenance.
6. Precautions
6.1 The gyroscope north finder should be handled gently during transportation and installation, and impact is strictly prohibited.
6.2 During the process of searching north, the carrier should be kept absolutely stationary (without vibration), otherwise it will affect the accuracy of searching north.
6.3 The longitudinal and transverse inclination angles of the carrier should not exceed ± 8 °, otherwise it will affect the accuracy of north finding.
7. General Quality Characteristics Requirements
a) Use the platform to fix and install equipment.
b) The specific environmental adaptability is as follows:
a) Working temperature: -40 ℃~+55 ℃
High temperature operation: According to GJB 150.3A-2009; Program II” Execution, working temperature is+55 ℃; Low temperature operation: According to GJB 150.4A-2009; Program II” Execution, working temperature is -40 ℃;
b) Storage temperature: -45 ℃ to+60 ℃
High temperature storage: According to GJB 150.3A-2009; Program I” Execution, storage temperature is+60 ℃; Low temperature storage: According to GJB 150.4A-2009; Program I” Execution, storage temperature is -45 ℃;
c) Low pressure: In accordance with GJB150.2A-2009 "Environmental Test Methods for Military Equipment Laboratories Part 2: Low pressure (Altitude) Test", the pressure is 57kpa and will be evaluated along with the system;
d) Rain exposure: in accordance with the procedure of GJB150.8A-2009 "Environmental Test Methods for Military Equipment Laboratories Part 8: Rain exposure Test"
1. According to the system assessment;
e) Damp heat: in accordance with the provisions of GJB150.9A-2009 "Environmental Test Methods for Military Equipment Laboratories Part 9: Damp heat Test", and evaluated with the system;
f) Mold: Complies with the provisions of GJB150.10A-2009 "Environmental Test Methods for Military Equipment Laboratories Part 10: Mold Test" and is assessed with the system;
g) Salt spray: in accordance with GJB150.11A-2009 "Environmental Test Methods for Military Equipment Laboratories Part 11: Salt Spray Test"
Regulations, assessed with the system;
h) Vibration: Complies with the provisions of ground equipment in GJB150.16A-2009 "Environmental Test Methods for Military Equipment Laboratories - Vibration Test";
i) Impact: According to GJB 150.18A-2009; Program I” The relevant requirements are that the shock pulse wave is a half sine wave, the peak acceleration is 30g, the pulse duration is 25ms, and each axis (choose one axis of symmetry) is continuous for 3 times;
j) Sand and dust: comply with procedures I and II of GJB150.12-2009 "Environmental Test Methods for Military Equipment Laboratories - Sand and Dust Test"
regulations.
c) Electromagnetic compatibility
The electromagnetic compatibility of the system should meet the requirements of test items CE102, CS101, CS106, CS112, CS114, CS115, CS116, RE102, and RS103 in GJB151B-2013 "Requirements and Measurement of Electromagnetic Emission and Sensitivity of Military Equipment and Subsystems"
Meet the system usage requirements.
d) Reliability requirements
Mean time between failures (MTBF): ≥ 10000h.
e) Maintainability
Mean Time to Repair (MTTR): ≤ 0.4 hours.
f) Security
a) The selected parts, materials, and production processes should not pose potential hazards;
b) Parts that may come close during operation, adjustment, and maintenance should not carry high pressure, burrs, toxic gases, chemical combustion, or other hazards.
g) Interchangeability
When designing, interchangeability should be considered, and the same unit should be interchangeable. Continuous working hours
Continuous working time: ≥ 24 hours.
