CAJ | 학술논문

针对传统线性相位有限长单位冲击响应滤波器在机抖激光陀螺位置姿态测量系统(Position and Orientation System,POS)降噪解调中存在着运算量大和时延大的问题,提出一种基于线性相位无限长单位冲击响应滤波器的降噪解调方法.在时域内通过卡尔曼滤波参数估计使无限长单位冲击响应低通滤波器逼近线性相位有限长单位冲击响应低通滤波器,获得线性相位;在频域内建立无限长单位冲击响应低通滤波器目标函数,采用拟牛顿法对其进行优化求解,以降低其时延;再设计低阶线性相位无限长单位冲击响应带阻滤波器,降低滤波器运算量.实验结果表明,与传统的有限长单位冲击响应低通滤波方法相比,采用该方法设计的线性相位无限长单位冲击响应滤波器进行机抖激光陀螺POS降噪解调,在保证降噪解调效果的情况下,运算量减少超过40%,时延平均从10.125 ms减小到4.83 ms.
침대전통선성상위유한장단위충격향응려파기재궤두격광타라위치자태측량계통(Position and Orientation System,POS)강조해조중존재착운산량대화시연대적문제,제출일충기우선성상위무한장단위충격향응려파기적강조해조방법.재시역내통과잡이만려파삼수고계사무한장단위충격향응저통려파기핍근선성상위유한장단위충격향응저통려파기,획득선성상위;재빈역내건립무한장단위충격향응저통려파기목표함수,채용의우돈법대기진행우화구해,이강저기시연;재설계저계선성상위무한장단위충격향응대조려파기,강저려파기운산량.실험결과표명,여전통적유한장단위충격향응저통려파방법상비,채용해방법설계적선성상위무한장단위충격향응려파기진행궤두격광타라POS강조해조,재보증강조해조효과적정황하,운산량감소초과40%,시연평균종10.125 ms감소도4.83 ms.
The traditional linear phase Finite Impulse Response (FIR) filter had the disadvantages of large computation complexity and long time delay in mechanically dithered Ring Laser Gyro (RLG) Position and Orientation System(POS) noise attenuation. In this paper, a noise attenuation method based on linear phase Infinite Impulse Response (IIR) filter was proposed. In time-domain, a linear phase IIR lowpass filter was obtained by approaching a linear phase FIR lowpass filter through Kalman filter parameter estimating. In frequency-domain, the target function of the IIR lowpass filter was established and it was optimized by Quasi-Newton method. The time delay of the IIR filter was decreased. To further reduce computation complexity, a new low order IIR bandstop filter was designed. The experimental results show that the linear phase IIR filter designed by this method decreases the computation complexity by more than 40% and reduces the time delay from 10.125 ms to 4.83 ms with guaranteeing the noise attenuation performance, compared with the traditional FIR lowpass filter.