摘要
地面数字电视单频网重叠区干扰问题是理论热点及工程难点。本文以国标DTMB数字电视系统为例,给出了单频网重叠区正常解调的理论条件。然后以两个发射点为例,利用电子地图JavascriptAPI在浏览器中仿真出了在给定接收电平门限、PN序列及同频保护率三个参数下的覆盖区域,达到预期结果,实现了仿真分析。本文采用了"遍历矩形区域离散点拟合"的算法克服了电子地图无API直接画出双曲线的局限,并可推广绘制其他复杂的图形。该仿真系统基于HTML/Javascript/jQuery编写,兼容性较好,使用方便,但是必须经过不断地优化、修正才能更加精确地反映实际的覆盖情况。
Interference problem in overlapping area of terrestrial digital TV single frequency network is a theoretical hot spot and engineering difficulty. Taking national standard DTMB digital TV system as an example, the paper gives theoretical conditions for normal demodulation in overlapping area of single frequency network. Then, taking two transmission points as an example, coverage area under given three parameters of reception level threshold, PN sequence and co frequency protection rate is simulated in the browser by using electronic map JavaScript API, which achieves expected results and realizes simulation analysis. This paper adopts the algorithm of "traversing rectangular area discrete point fitting" to overcome the limitation of drawing hyperbola directly without API in electronic map, and it can be popularized to draw other complex graphs. The simulation system is written based on HTML/Javascript/jQuery, which has good compatibility and is easy to use, but it must be continuously optimized and revised to reflect actual coverage more accurately.
作者
徐玉辉
Xu Yuhui(Anhui Broadcasting&Television Corporation,Anhui 230071,China)
出处
《广播与电视技术》
2021年第10期92-97,共6页
Radio & TV Broadcast Engineering
关键词
地面数字电视
单频网
重叠区信号分析
电子地图
仿真
Terrestrial digital television
Single frequency network
Signal analysis in overlapping area
Electronic map
Simulation
