Guidance Filter Design Based on Strapdown Seeker and MEMS Sensors

Abstract

Precision guidance filter design for a tactical missile with a strapdown seeker aided by low-cost strapdown sensors has been addressed in this paper. The low-cost strapdown sensors consist of an IMU with 3-axis accelerometers and gyroscopes, 3-axis magnetometers, and a barometer. Missile's position, velocity, attitude, and bias error of the barometer are considered as state variables. Since the state and measurement equations are highly nonlinear, we adopt UKF(Unscented Kalman Filter). The proposed guidance filter has a function of a navigation filter if target position error is not considered. In the case that the target position error is introduced, the proposed filter can effectively estimate the relative states of the missile to the true target. For specific engagement scenarios, we can observe that observability problems occur.

Look-Angle-Control Homing Loop Design with a Strapdown Seeker and Single Gyroscope

“…Parasite loop를 이용하여 구 한 시선각속도를 이용하지 않는 유도방식에는 유 도필터를 이용하는 방식이 있다. 이 방식은 칼만 필터 기반의 상태추정필터를 설계하여 유도탄과 표적 사이의 상대운동을 추정하고, 이를 이용하 여 시선각속도를 계산하거나 [5], 상대운동정보를 이용하여 새로운 유도법칙을 적용하는 방식이다 [6]. …”

Study on Parasite Effect with Strapdown Seeker in Consideration of Time Delay

“…With this approach, the stability regions of the parasite loop, involving the strapdown homing seeker, were analyzed in several studies [5][6][7][8]. As the second research direction, some efforts have also been made to devise new homing guidance laws, corresponding terminal homing guidance loops [9][10][11], and guidance filters for the strapdown seeker [12][13][14].…”