一种新的磁传感器辅助弹载接收机跟踪环路的方法

针对弹载接收机高速旋转的特性,提出一种利用磁传感器测量弹体姿态,补偿旋转引起的载波多普勒频移和相位偏移的方法。首先,根据弹丸弹道学特征,推导弹体高速旋转引起的载波频移和相位偏移与弹体姿态的表达式;其次,研究了接收机载波跟踪环路的跟踪门限与弹体动态应力的关系;然后,给出弹体坐标系中,磁传感器测量弹体姿态的算法——极值比值法和积分比值法。仿真试验结果表明,磁传感器弹体姿态估计的方法能够有效降低弹载接收机跟踪环路的跟踪门限,其载噪比降低了3 dB·Hz,环路带宽减小了100 Hz以上,提高了弹载接收机GNSS信号跟踪能力。

Novel assisted carrier tracking loop based on magnetic sensors for the projectile receiver

Concerning on the characteristics of high-spin projectile receiver,a method of projectile attitude measurement by magnetic sensors is proposed to compensate the Doppler shift and phase shift caused by the projectile's spin.Firstly,according to the characteristics of projectile trajectory,the expression of the frequency shift and the phase shift caused by the projectile's spin and the expression of the projectile attitude are derived.Secondly,the relationship between the tracking threshold of the projectile receiver's tracking loop and the dynamic stress is studied.Then,the algorithms of the measurements of projectile attitude by magnetic sensors in the system of projectile body coordinate are given,which are the extreme value ratio method and the integral ratio method.The simulation results show that estimating the projectile attitude by magnetic sensors can effectively reduce the tracking threshold of the tracking loop of the projectile receiver,and the cartier to noise ratio and the loop bandwidth are reduced by 3 dB·Hz and more than 100 Hz,respectively.The GNSS signal tracking capability of the projectile receiver can be improved effectively.