Influence of Time-Varying Plasma Sheath on the Lock Condition of Phase-Locked Loop for TT&amp;C Carrier Tracking System

Zhu, Congying; Li, Xiaoping; Shi, Lei; Liu, Yanming; Yao, Bo

doi:10.1109/tps.2017.2676242

Cited by 20 publications

(10 citation statements)

References 20 publications

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“…However, when an electromagnetic wave that is much shorter than the variation time of its electron density passes through plasma, the electron density does not change from the time that the electromagnetic wave enters plasma until it passes through the plasma. Therefore, when the distribution of the plasma sheath electron density is known, a uniform stratified analytical solution can be used to calculate the amplitude attenuation and phase noise of the signal passing through the plasma [12].…”

Section: Amplitude Attenuation and Phase Fluctuation Characteristicsmentioning

confidence: 99%

“…With regard to the receiver of a telemetry system and considering signal distortion (amplitude attenuation and phase shift), the received signal is expressed as [12]:…”

Section: The Impact Of Time-varying Amplitude Attenuation On Traditiomentioning

confidence: 99%

“…To address these problems and improve the performance of carrier phase tracking, in 2017, Zhu began to study the influence of phase noise on carrier synchronization under the plasma sheath channel [12]. This revealed the impact of the phase noise on carrier tracking for three typical TT&C signals at the Ka band, and a tracking loop based on traditional PLL was proposed [13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unconventionally Designed Tracking Loop Adaptable to Plasma Sheath Channel for Hypersonic Vehicles

Shi

Yuan

Yao

2020

Sensors

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An aircraft that moves through the atmosphere at hypersonic speed is covered by plasma sheath, which causes random and fast time-varying amplitude attenuation and phase fluctuation in received signals. This paper comprehensively analyzes the mechanism of the amplitude attenuation effects on a traditional phase-locked loop (PLL), which is always ignored in traditional scenarios (such as satellite telemetry and vehicle communication). Simulation results and theoretical analysis showed that traditional PLL does not work reliably for signal carrier tracking with the severe time-varying amplitude attenuation of the plasma sheath channel. In this paper, an unconventionally designed Kalman filter (KF) tracking loop that is aware of phase dynamics and amplitude attenuation fluctuation for hypersonic vehicles is proposed. To introduce time-varying amplitude attenuation into the proposed KF-based tracking loop, the amplitude attenuation is first modeled with an autoregressive model. The statistical characteristics of the amplitude and phase fluctuation are then incorporated into the state equation and observation equation. Simulation results indicate that the proposed tracking loop is stable when the signal-to-noise ratio is −10 dB with the Ka band, even in the most severe flight environment for hypersonic vehicles.

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Section: Amplitude Attenuation and Phase Fluctuation Characteristicsmentioning

confidence: 99%

“…With regard to the receiver of a telemetry system and considering signal distortion (amplitude attenuation and phase shift), the received signal is expressed as [12]:…”

Section: The Impact Of Time-varying Amplitude Attenuation On Traditiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unconventionally Designed Tracking Loop Adaptable to Plasma Sheath Channel for Hypersonic Vehicles

Shi

Yuan

Yao

2020

Sensors

Self Cite

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“…Frequency estimation of a sinusoid in additive white Gaussian noise (AWGN) is a classical problem in many fields, such as radar communication, satellite navigation and aerospace tracking, telemetry and command (TT&C) [1][2][3]. Fast and accurate frequency estimation algorithms are required to ensure reliable communications.…”

Section: Introductionmentioning

confidence: 99%

A fine frequency estimation algorithm based on DFT samples and fuzzy logic for a real sinusoid

Shi

Wang

et al. 2022

IET Radar Sonar & Navi

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The study on the frequency estimation of a real sinusoid has been addressed in this article. Discrete‐Fourier‐transform (DFT)‐based frequency estimation always uses the maximum bin of DFT as a coarse estimation followed by a fine estimation algorithm, which computes a correction term to compensate for the initial frequency offset caused by the coarse estimation. To enhance the frequency estimation accuracy, a fine estimation algorithm based on DFT samples and fuzzy logic (FL) is proposed in this study. Firstly, a modified phase‐based algorithm is presented to estimate the sign of the correction term. Then, a main‐lobe coefficient and a side‐lobe coefficient are constructed using the amplitude of three spectral lines to calculate the correction term. A FL controller is utilised to generate a weighted factor to adjust the weight of the main‐lobe coefficient and the side‐lobe coefficient in the formula of the correction term. Compared with other existing fine algorithms, the proposed algorithm improves the correct probability of sign estimation by 10%–20%, and improves the estimation accuracy by 5%–8% at lower carrier‐to‐noise ratios (CNRs). In addition, the performance of the proposed algorithm is less affected by the initial frequency offset than other algorithms.

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“…Hypersonic vehicles that fly in near‐space at speeds of 5‐20 Mach have attracted substantial attention over the past few years [1–3]. The corresponding exploration of the tracking, telemetry, and command (TT&C) technology has become increasingly active [4–6]. Under the hypersonic vehicle communication scenarios, large challenges emerge different from conventional wireless communications.…”

Section: Introductionmentioning

confidence: 99%

Fast Doppler shift acquisition method for hypersonic vehicle communications

et al. 2020

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Influence of Time-Varying Plasma Sheath on the Lock Condition of Phase-Locked Loop for TT&C Carrier Tracking System

Cited by 20 publications

References 20 publications

Unconventionally Designed Tracking Loop Adaptable to Plasma Sheath Channel for Hypersonic Vehicles

Unconventionally Designed Tracking Loop Adaptable to Plasma Sheath Channel for Hypersonic Vehicles

A fine frequency estimation algorithm based on DFT samples and fuzzy logic for a real sinusoid

Fast Doppler shift acquisition method for hypersonic vehicle communications

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