摘要
弹载接收机需同时应对高动态和低信噪比的压力,文中结合北斗二代导航系统特殊的电文体制,提出基于扩展卡尔曼滤波的载波跟踪算法,使弹载北斗二代接收机同时满足高动态和高灵敏度双重要求。仿真表明,该跟踪方案在加速度25g,加加速度100g/s的高动态环境下,相较于传统的FLL辅助PLL方案,相位跟踪误差缩小到约50%,频率跟踪误差缩小到约75%。另外,在信噪比低至36dB-Hz的弱信号环境,该方案仍能保持稳定跟踪。
The missile-borne receivers have to deal with the pressure of the high dynamic and low signal-to-noise ratio, article combined with special navigation message format of the BD-2 navigation system, proposed BD-2 signal carrier tracking algorithm based on extended Kalman filter（ EKF）, made the missile-borne receivers meet the dual requirements of high dynamic and high sensitivity. Simulation show that compared to traditional FLL assisted PLL program, the EKF tracking program＇ s phase tracking error is reduced to about 50% and fre- quency tracking error is reduced to about 75% in the high dynamic environment with acceleration of 25g and jerk of 100g/s. In addition, in weak signal environment with C/N0 as low as 36dB-Hz. the nro^ram keens stahle tracking,
出处
《弹箭与制导学报》
CSCD
北大核心
2013年第6期179-181,185,共4页
Journal of Projectiles,Rockets,Missiles and Guidance
