各向同性電離層低頻一跳天波時(shí)延特性研究
doi: 10.11999/JEIT190528 cstr: 32379.14.JEIT190528
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1.
陜西科技大學(xué)電子信息與人工智能學(xué)院 西安 710021
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2.
陜西科技大學(xué)電氣與控制工程學(xué)院 西安 710021
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3.
空軍工程大學(xué)航空工程學(xué)院 西安 710038
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4.
西安理工大學(xué)自動(dòng)化與信息工程學(xué)院 西安 710048
Study on Time Delay Characteristics of Low Frequency One-hop Sky Waves in the Isotropic Ionosphere
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1.
School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an 710021, China
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2.
School of Electrical and Control Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
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3.
College of Aeronautics Engineering, Air Force Engineering University, Xi’an 710038, China
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4.
School of Automation and Information Engineering, Xi’an University of Technology, Xi’an 710048, China
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摘要:
低頻天波的準(zhǔn)確預(yù)測(cè)對(duì)于低電離層探測(cè)、遠(yuǎn)程導(dǎo)航授時(shí)具有重要意義。該文基于傳統(tǒng)“波跳”理論和FDTD方法對(duì)地-電離層波導(dǎo)中天波傳播時(shí)延特性進(jìn)行研究。結(jié)合天地波時(shí)域分離技術(shù)，給出了100 kHz載頻羅蘭-C信號(hào)在均勻/指數(shù)漸變各向同性電離層條件下，距發(fā)射臺(tái)200 km范圍內(nèi)采用兩種方法計(jì)算的一跳天波時(shí)延隨收發(fā)距離的變化規(guī)律。與“波跳”理論相比，該方法可同時(shí)考慮地面不規(guī)則、電離層晝夜參數(shù)分布不均勻的影響，計(jì)算精度更高。
Abstract:Accurate prediction of low-frequency sky-wave has significance for the lower ionosphere detection and remote navigation timing. The characteristics of sky-wave propagation time delay in the Earth-ionosphere waveguide are studied in this paper based on the traditional wave-hop theory and FDTD method. Time delay variations of 100 kHz one-hop sky waves are given under homogeneous/exponentially graded isotropic ionosphere waveguide models. The great-circle distance between the transmitter and the receiver is within 200 km. Together with a sky- and ground-wave separation technique in the time domain, the narrow-band Loran-C signals are employed in two methods. Compared to the results of wave-hop theory, the method in this paper has higher calculation accuracy by considering the influence of irregular earth and inhomogeneous distribution of ionospheric day-night parameters at the same time.
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Key words:
- Low-frequency wave /
- Wave-hop theory /
- One-hop sky wave /
- Time delay
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