Time-Delay-Based Multi-Target Detection and Power Delivering

Zhong, Xin; Liao, Cheng; Lin, Wenbin

doi:10.2528/pierm11042502

Cited by 1 publication

(1 citation statement)

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“…The amplitude of the multi-path time delay spread of the ionospheric channel is related to the signal energy distribution of different propagation modes, and to the relative time delay of the multi-mode propagation and its space distribution [31]. Both the signal energy distribution and the relative time delay are closely associated with the ratio K which is the operating frequency of the basic maximum usable frequency (MUF).…”

Section: Experimental Analysismentioning

confidence: 99%

Statistical Characteristics of the Multi-Path Time Delay and Doppler Shift of a Radar Wave Propagating Through the Ionosphere

Ma¹,

Guo²,

Su³

2013

PIER

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Abstract-Multi-path time delay spread is a very important factor in the bit error rate of high-frequency ionospheric communication channels and in the target detection performance of over-the-horizon radars. In this study, the probability density distribution of multi-path time delay and Doppler shift of ionospheric radio signal are derived using Rayleigh fading. Moreover, the probability density distribution of time delay, average power of the received signal, and received signal variance are discussed in detail. Using a designed experimental circuit, the measured value of the multi-path time delay spread is obtained from three given radio paths by the sweep-frequency pulse sounding technique. The average value of the multi-path time delay spread that changes with the ratio K, which is the operating frequency of the basic maximum usable frequency, is also analyzed and fitted using the least-squares fitting method. Theoretical and statistical research shows that for a given radio path and specific frequency, the multi-path time delay spread approximately follows a normal distribution. The average time delay spread decreases with the increase in the ratio K; however, it eventually approaches a steady value. The results of this research provide an empirical reference for further prediction and estimation of the time delay spread of a radar wave propagating through the ionosphere.

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Section: Experimental Analysismentioning

confidence: 99%