So sánh phương pháp

	Hệ thống Tham chiếu Hướng và Thái độ (AHRS)	Dẫn đường Tỷ lệ	Thái độ Quaternion
Lĩnh vực	Hàng không vũ trụ	Hàng không vũ trụ	Hàng không vũ trụ
Họ	Process / pipeline	Process / pipeline	Process / pipeline
Năm ra đời	1940s	1957	1843
Người khởi xướng	Aviation heritage	Lin-Hsiung Chu	William Hamilton (quaternions), aerospace engineers
Loại	System	Guidance law	Mathematical framework
Công trình gốc	Savage, P. G. (2007). Strapdown Inertial Integration Technology (2nd ed.). Strapdown Associates.	Knox, W. P. (1971). On optimal proportional navigation. IEEE Transactions on Aerospace and Electronic Systems, AES-7(3), 417–426.	Shuster, M. D. (1993). A survey of attitude representations. Journal of the Astronautical Sciences, 41(4), 439–517.
Tên gọi khác	AHRS system, attitude reference, heading sensor	PN, PN law	quaternion representation, attitude kinematics, q-vector
Liên quan	3	3	3
Tóm tắt	An Attitude Heading Reference System (AHRS) is a complete inertial navigation subsystem that estimates and outputs the three-dimensional orientation (attitude) and heading of a vehicle or platform. AHRS combines measurements from accelerometers, gyroscopes, and often magnetometers through sensor fusion algorithms (typically Kalman filters or complementary filters) to provide a drift-free, fast attitude estimate. AHRS is standard in aviation, marine navigation, and modern autonomous systems.	Proportional Navigation (PN) is a guidance law that generates command accelerations proportional to the rate of change of the line-of-sight angle between a pursuer and target. Introduced by Lin-Hsiung Chu in the 1950s, it became the foundation of modern missile guidance systems. PN solves the pursuit-evasion problem by ensuring that the pursuer intercepts a moving target with minimal computational overhead.	Quaternion attitude representation is a mathematical framework for describing three-dimensional rotations using four-dimensional vectors (quaternions). Superior to Euler angles due to the absence of singularities (gimbal lock), quaternions are the standard representation in modern attitude estimation, spacecraft control, and 3D computer graphics. Quaternion kinematics elegantly expresses how attitude evolves under angular velocity measurements from gyroscopes.