ITU-R P.434计算F2层基本最高可用频率与实测值的比较
Comparison between basic MUF calculated by ITU-R P.434 and measurements
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摘要: 利用我国2011年1月和7月10条斜测电路的F2层基本最高可用频率(MUF)月中值数据,与ITU-R P.434方法计算的F2层基本MUF进行了比较,分析了该方法在中国地区的适用性。结果表明:ITU-R P.434方法在中国地区具有较好的适用性,但在某些电路的个别时段偏差较大。其中,1月份在中纬地区日出时段,该方法给出的基本MUF与月中值相比偏低20%~30%,在日落时段则偏高20%~30%;低纬地区夜间时段两者的相对偏差较大,最大值达到40%.7月份,该方法的结果与各条电路的实测结果基本一致,相对偏差在-10%~20%之间。上述结果对短波通信的选频等具有一定的指导意义。Abstract: The F2 layer basic maximum usable frequency(MUF)value calculated by the ITU-R P.434 method is compared with the median of measurement for 10 oblique circuits in China during January and July,2011,and then the applicability of ITU-R P.434 in China area is analyzed.It is shown that the method has good applicability in China,except that sometimes there are certain error in some circuits.In January,MUF value calculated by ITU-R P.434 is less than the median of measurement by 20%~30% in mid-latitude during sunrise,while it is larger by 20%~30% during sunset.The relative difference between these two values at low-latitude is larger during mid-night,reaching about 40%.In July,the two values agree with each other quite well in all circuits,and the relative differences are among about-10%~20%.This result is valuable to HF applications such as the frequency selection.
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