Design of a Fully Digital BPSK Demodulator Integrated into a TT&amp;C Satellite Transponder

Lucena, Antonio Macilio Pereira de; Silva, Adeildo Sombra da; Viot, Diego Dutra; Ambrosio, Ana María

doi:10.1109/tla.2020.9381792

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…In addition, considering the demand for constant envelope characteristics in TT&C as well as bandwidth limitations, MSK and GMSK are also recommended [47,48]. For spread-spectrum TT&C, typical direct sequence spread spectrum technology usually uses BPSK modulation [33,[49][50][51][52]. BPSK is also the foundation of other direct spread-spectrum modulation methods in the field of TT&C [53].…”

Section: Principle Of Single-station Emergency Icandt 21 Icandt Modul...mentioning

confidence: 99%

“…In the vertical direction, under the combined effects of air buoyancy and self-gravity, the motion of the radar chaff can regard as a uniform equilibrium motion state. The descending speed is related to the specific altitude [75]: (49) where µ m is the average molecular weight, g 0 = 9.8 m/s 2 is the gravitational acceleration, H is the height at which the radar chaff cloud is located, k B = 1.38 × 10 −23 J/K is the Boltzmann constant, J is the energy unit, and K is the thermodynamic temperature unit. T m is the temperature in degrees Celsius corresponding to the height, and its conversion relationship with the thermodynamic temperature is K 0 = T m + 273.15 • C, k B T m = 0.02852 eV (when T m = 300 K), which represents the relevant reduced unit.…”

Section: Modeling Of the Motion Characteristics Of Radar Chaff Cloudsmentioning

confidence: 99%

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Chaff Cloud Integrated Communication and TT&C: An Integrated Solution for Single-Station Emergency Communications and TT&C in a Denied Environment

Ye,

Yang,

Chen

et al. 2024

Drones

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In response to potential denial environments such as canyons, gullies, islands, and cities where users are located, traditional Telemetry, Tracking, and Command (TT&C) systems can still maintain core requirements such as availability, reliability, and sustainability in the face of complex electromagnetic environments and non-line-of-sight environments that may cause service degradation or even failure. This paper presents a single-station emergency solution that integrates communication and TT&C (IC&T) functions based on radar chaff cloud technology. Firstly, a suitable selection of frequency bands and modulation methods is provided for the emergency IC&T system to ensure compatibility with existing communication and TT&C systems while catering to the future needs of IC&T. Subsequently, theoretical analyses are conducted on the communication link transmission loss, data transmission, code tracking accuracy, and anti-multipath model of the emergency IC&T system based on the chosen frequency band and modulation mode. This paper proposes a dual-way asynchronous precision ranging and time synchronization (DWAPR&TS) system employing dual one-way ranging (DOWR) measurement, a dual-way asynchronous incoherent Doppler velocity measurement (DWAIDVM) system, and a single baseline angle measurement system. Next, we analyze the physical characteristics of the radar chaff and establish a dynamic model of spherical chaff cloud clusters based on free diffusion. Additionally, we provide the optimal strategy for deploying chaff cloud. Finally, the emergency IC&T application based on the radar chaff cloud relay is simulated, and the results show that for severe interference, taking drones as an example, under a measurement baseline of 100 km, the emergency IC&T solution proposed in this paper can achieve an accuracy range of approximately 100 m, a velocity accuracy of 0.1 m/s, and an angle accuracy of 0.1°. In comparison with existing TT&C system solutions, the proposed system possesses unique and potential advantages that the others do not have. It can serve as an emergency IC&T reference solution in denial environments, offering significant value for both civilian and military applications.

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Section: Principle Of Single-station Emergency Icandt 21 Icandt Modul...mentioning

confidence: 99%

Section: Modeling Of the Motion Characteristics Of Radar Chaff Cloudsmentioning

confidence: 99%

Chaff Cloud Integrated Communication and TT&C: An Integrated Solution for Single-Station Emergency Communications and TT&C in a Denied Environment

Ye,

Yang,

Chen

et al. 2024

Drones

View full text Add to dashboard Cite

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Four-channel all-optical wavelength conversion unit based on nonlinear effect of three-section monolithically integrated semiconductor lasers

Zheng

et al. 2023

Appl. Opt.

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A simple and highly efficient four-channel all-optical wavelength conversion based on four-wave mixing effect of the directly modulated three-section monolithically integrated semiconductor laser is proposed and experimentally investigated. For this wavelength conversion unit, the spacing of the wavelength can be adjusted by tuning the bias current of the lasers and setting it to be 0.4 nm (50 GHz) as a demonstration is this work. A 50 Mbps 16-QAM signal centers at 4–8 GHz is experimentally switched to a targeted path. Up- or downconversion depends on a wavelength-selective switch, and the conversion efficiency can reach up to −2 to 0 dB. This work provides a new technology for photonic radio-frequency switching matrix and contributes to the integrated implementation of satellite transponders.

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Design of a Fully Digital BPSK Demodulator Integrated into a TT&C Satellite Transponder

Cited by 2 publications

References 22 publications

Chaff Cloud Integrated Communication and TT&C: An Integrated Solution for Single-Station Emergency Communications and TT&C in a Denied Environment

Chaff Cloud Integrated Communication and TT&C: An Integrated Solution for Single-Station Emergency Communications and TT&C in a Denied Environment

Four-channel all-optical wavelength conversion unit based on nonlinear effect of three-section monolithically integrated semiconductor lasers

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