Search - frequency tracking loop

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[Industry research] 1 DL : 0: 超紧耦合是 GPS/INS 组合导航系统的最新研究方向，它采用 INS 测得的载体动态信息辅助 GPS 接收机跟踪环路，消除卫星信号中由于载体与卫星之间相对运动所产生的频率偏移，提高接收机在高动态环境下载波跟踪性能，同时还可以压缩带宽，有效增强接收机抗干扰性能。介绍 GPS/INS 超紧耦合技术，给出 INS 辅助 GPS 载波跟踪环路结构图和相应的数学模型，分析 INS 辅助 GPS 跟踪环路在动态环境下的动态残留及其对环路相位误差的影响，并进行了模型仿真，最后对仿真结果进行了验证分析。仿真结果显示，辅助动态残留及其导致的环路相位误差的大小与加加速度、环路辅助时间间隔成正比。 -The ultra-tightly coupled GPS/INS integrated navigation system latest research direction, it adopted the INS measured the carrier dynamic information auxiliary GPS receiver tracking loop to eliminate the satellite signal frequency due to the relative motion between the carrier and the satellite offset improve the receiver in high dynamic environment download wave tracking performance, but also can compress bandwidth, effectively enhance the anti-jamming performance of the receiver. Introduced GPS/INS ultra-tight coupling technology gives INS assisted GPS carrier tracking loop diagram and the corresponding mathematical model to analyze the impact of the INS assisted GPS tracking loop dynamic residues in a dynamic environment and the loop phase error, and model simulation, and analysis of simulation results verified. Simulation results show that the the residual secondary dynamic its resulting size of the error loop phase and jerk loop secondary is proportional to the time interval.
Date : 2025-12-23 Size : 193kb User : LeeYJ
[Industry research] 5 DL : 0: 在GPS软件接收机和SINS辅助GPS跟踪技术的基础上,提出了一种SINS/GPS超紧致组合导航方案。该超紧致方案在GPS软件接收机的捕获环节中加入了基于相位估计的精细捕获算法,从而提高了频率捕获精度,省略了频率跟踪牵引过程在信号跟踪环节中,利用SINS位置、速度信息与卫星参数,求取接收机与卫星之间的径向距离和径向距离率,为码环、载波环提供辅助,从而降低了载体动态变化对跟踪环的影响,提高了跟踪环的动态跟踪性能同时,降低载波环噪声带宽,减小码环相关间隔,从而提高了载波环和码环的跟踪精度。-On the basis of the software GPS receiver and SINS assisted GPS tracking technology, ultra-compact combination of an SINS/GPS navigation scheme. The Super Compact program was added in the capture of the GPS receiver software link based the phase estimate Narrow capture algorithm, thereby improving the accuracy of frequency acquisition, frequency tracking traction process is omitted signal tracking link SINS position, speed information and satellite parameters, to strike a radial distance between the receiver and satellite and the radial distance rate, to provide auxiliary code loop, carrier loop and thereby reducing the influence of the carrier dynamic changes of the tracking loop, and to improve the dynamic tracking of the tracking loop performance while reducing the noise bandwidth of the carrier loop, to reduce the code ring associated interval, thereby improving the accuracy of the tracking of the carrier ring and the code ring.
Date : 2025-12-23 Size : 17kb User : LeeYJ
[Industry research] gardnertimingdetector DL : 0: This paper presents the simulation performance of the all-digital symbol timing recovery using the Gardner Timing Error Detector over π/4-DQPSK modulation. The open loop statistics, the S-curve and the normalized timing error variance, were investigated to show the stable tracking performance of the system. The symbol timing recovery has a second order loop transfer function, which was able to track down phase, and frequency offsets. Modulation was observed to have a performance of 2 dB lower from the theoretical BER curve.
Date : 2025-12-23 Size : 270kb User : joel vilca