关于导弹飞行目标导航跟踪精度研究
张盟;王兆瑞;张杰
【期刊名称】《计算机仿真》 【年(卷),期】2017(034)004
【摘要】The missile's velocity,acceleration and jerk are quite high,and the linear and quadratic variation rates of Doppler frequency shift are great.Conventional carrier tracking loop can lose lock,and stable carrier tracking is a key factor for the GNSS receiver to work under high dynamic environment.Based on the conventional FLL-assisted PLL tracking loop,a weighting factor carrier tracking method is proposed,which
is
assisted
by
Four-Quadrant
Frequency
Discriminator.Firstly,frequency offset of the received signal was drawn to the lower range by using the nonlinear characteristic of the FQFD.Then,the weights of FLL and PLL were adjusted by weighting factors,and the relevant parameters were determined.This weight adjustment can perform a better integration of FLL and PLL in the tracking process.The thermal noise error,the dynamic adaptability and the appropriate bandwidth were analyzed.The capability of the new carrier tracking was simulated and the result proves that whatever the time function of the Doppler frequency is,the carrier can be tracked by using the new carrier tracking loop.It can be concluded that the new carrier tracking is valid.%由于导弹的速度、加速度和加加速度都较高,多普勒
关于导弹飞行目标导航跟踪精度研究
