摘要
针对GNSS抗干扰接收机前端放大器增益与接收功率失配造成的抗干扰能力下降的问题,将数字AGC系统引入射频前端,提出了一种基于采样值分布的快速数字AGC方法,通过目标增益检测灵敏度最大准则确定最优分布概率检测门限,实现信号功率的准确检测,通过差值过零检测计算增益调整步长,实现准确增益控制及AGC的快速收敛。数值实验表明,该方法可实现相同分布概率估计误差下最小的电平检测误差,且相比传统峰峰值检测、平均功率和采样值分布数字AGC方法具有更好的收敛性能,可显著提升GNSS抗干扰接收机的抗干扰处理能力。
Aiming at the problem of decreasing anti-interference ability caused by mismatch between the gain of the front-end amplifier and the received power of GNSS anti-interference receiver,this paper proposes a fast digital AGC method based on sampling value distribution.The detection threshold of optimal distributed value is determined by the maximum sensitivity criterion of target gain detection,so as to achieve accurate signal power detection.The gain adjustment step is calculated by difference zero-crossing detection to achieve accurate gain control and fast AGC convergence.Numerical experiments show that this method can achieve the minimum level detection error under the same distribution probability estimation error,and has better convergence performance than the traditional peak-to-peak detection,average power and sampling distribution digital AGC methods,which can significantly improve the anti-interference processing ability of GNSS anti-interference receiver.
作者
褚兴华
王娟
朱晨昊
侯鸿雁
武美成
CHU Xinghua;WANG Juan;ZHU Chenhao;HOU Hongyan;WU Meicheng(North Automatic Control Technology Institute,Taiyuan 030006,China;Shanxi Province Key Laboratory of Beidou Navigation Satellite System Information Service Technology,Taiyuan 030006,China)
出处
《兵器装备工程学报》
北大核心
2025年第9期314-321,332,共9页
Journal of Ordnance Equipment Engineering
基金
国防基础科研基金项目(JCKY2021110B)。
