摘要
针对直接序列扩频信号的捕获,笔者提出一种收敛函数改进的Tong检测判决方法,旨在通过设置计数变量对应的正、负计数步进来控制搜索速度。该方法首先根据具体任务预设置计数的初值和上限,以及正步进A_(+)、负步进A_(-)与计数变量K之间的函数关系;然后在时频单元搜索过程中,如果检验统计量大于门限,则K值加上对应的A_(+),否则K值减去对应的A_(-);最后将计数变量K与零和计数上限进行比较,决定是否继续搜索同一单元。本方法的主要特点在于根据具体条件分别设计正、负计数步进和计数变量之间的函数关系,协调有信号单元和无信号单元的搜索速度,进而改善平均驻留时间,提高捕获性能。
For the acquisition of direct sequence spread spectrum(DSSS)signals,A new Tong multiple trial algorithm with improved convergence function is proposed,which aims to control the search speed by setting the positive and negative counting steps corresponding to the counting variable.Firstly,the initial value and upper limit of counting variable are preset according to the specific tasks,as well as the relationship between positive and negative steps and counting variable.Then in the search process of time-frequency unit,if the test statistic is greater than the threshold,the corresponding positive step is added with the count variable;otherwise the corresponding negative step is subtracted from the count variable.Finally,compare the count variable with zero and the upper limit to decide whether to continue searching for the same unit.The main feature of this method is to design the function relationship between positive and negative steps and counting variables in line accordance with specific conditions,and make suitable search speed for the signal unit and signal-free unit,thus cutting down the mean number of dwell times and improving acquisition performance.
作者
唐平
赵哲
高原
李博骁
郭继光
TANG Ping;ZHAO Zhe;GAO Yuan;LI Boxiao;GUO Jiguang(China Academic of Electronics and Information Technology,Beijing 100041,China)
出处
《信息与电脑》
2021年第5期65-67,共3页
Information & Computer
关键词
收敛函数
Tong检测
计数步进
驻留时间
convergence function
Tong multiple trial
counting steps
dwell time
作者简介
唐平(1989-),女,湖北襄阳人,博士研究生,工程师。研究方向:预警体系总体设计、通信信号处理。
