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本文以工作频率对基本最高可用频率的比值作参数,分析了电离层信道时延散布和天波信号能量的变化规律。对测试数据所作的分析表明,时延散布近似服从正态分布。时廷散布的平均值与上述比值的关系近似为抛物曲线。据此,本文推荐了一个计算不同工作频率时延散布平均值的经验公式。天波信号能量随工作频率的变化规律与该电路的传播机理吻合得很好。并且,与其他地区中距离电路的测试结果十分一致。 分析表明,对电路信道参数变化规律的研究有助于开发频率资源,对实时频率预报技术也有实用价值。
In this paper, the ratio of operating frequency to the highest available frequency is used as parameter to analyze the variation of ionospheric channel delay spread and sky wave signal energy. The analysis of the test data shows that the spread of delay approximates the normal distribution. The relationship between the average of the tian ting distribution and the above ratio is approximately a parabolic curve. Accordingly, this paper proposes an empirical formula to calculate the average of the spread of different operating frequencies. The variation of sky wave signal energy with the operating frequency coincides well with the propagation mechanism of this circuit. And, and other regions in the distance circuit test results are very consistent. The analysis shows that the study of the variation of circuit channel parameters helps to develop frequency resources and has practical value for real-time frequency prediction techniques.