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Xplore Articles related to Space Communications

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Deep Space Communications

Deep Space Communications, None

Communications are required and critical to the success of space missions. This chapter summarizes the theoretical background for telecommunications link analysis and telecommunications design control. It defines the signal performance metrics, such as signal‐to‐noise‐spectral‐density ratios. In addition, the component link parameters that enhance or impair the performance are also defined. The chapter describes the statistical technique that has been used ...


Mars Exploration Rover Telecommunications

Deep Space Communications, None

This chapter describes and assesses telecommunications of the two rovers launched in 2003 and named Spirit and Opportunity. Generally, the term 'spacecraft' refers to the vehicle before landing, and the term 'rover' refers to the vehicle after landing. For each spacecraft, there were three phases of the Mars Exploration Rover (MER) primary flight mission. The chapter provides a description of ...


Synchronization challenges in deep space communications

IEEE Aerospace and Electronic Systems Magazine, 2019

Deep space missions keep pushing for new frontiers affecting a wide spectrum of disciplines. To support the scientific achievements expected from new missions, communication technology is being pushed towards its limits [1]. A need to increase communication links data rate as well as to lower the operative signal-to-noise ratio (SNR) are identified. The adoption of advanced coding schemes such as ...


Intelligent Space-Based Radio Telescope and Communication System

2019 Chinese Control And Decision Conference (CCDC), 2019

In order to improve the resolution and sensitivity of present radio telescopes, an advanced system based on the distributed cooperative control is proposed here. As a space-based communication station, the system deployed in GEO is consisted of a feed source satellite, a central satellite and 4450 unit satellites in the form of precise and independent assembling. The central satellite can ...


Frequency-Phase Decoupling Method for Carrier Synchronization in Space Communications

IEEE Wireless Communications Letters, 2019

In space communications, there exist two prominent issues: large Doppler spread and limited pilot resources, which will result in poor performance for a pilot-aided (PA) traditional carrier synchronization mode (TCSM) with serial processing. In view of this, we propose a frequency-phase decoupling method (FPDM) based on an unbiased auto-correlation (AC) operator with a variable correlation delay length. By using this ...


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Educational Resources on Space Communications

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IEEE-USA E-Books

  • Deep Space Communications

    Communications are required and critical to the success of space missions. This chapter summarizes the theoretical background for telecommunications link analysis and telecommunications design control. It defines the signal performance metrics, such as signal‐to‐noise‐spectral‐density ratios. In addition, the component link parameters that enhance or impair the performance are also defined. The chapter describes the statistical technique that has been used in the design of deep space telecommunications systems. The design procedure for deep space telecommunications systems design and the selection of a particular criterion for conservatism are both driven by weather conditions in the signal path between the ground station antenna and the spacecraft on telecommunications performance. The percentile technique for incorporating weather into telecommunications design control requires the preparations of two design control tables. There are two techniques for incorporating weather into telecommunications design control. The chapter explains the percentile weather technique in detail.

  • Mars Exploration Rover Telecommunications

    This chapter describes and assesses telecommunications of the two rovers launched in 2003 and named Spirit and Opportunity. Generally, the term 'spacecraft' refers to the vehicle before landing, and the term 'rover' refers to the vehicle after landing. For each spacecraft, there were three phases of the Mars Exploration Rover (MER) primary flight mission. The chapter provides a description of the MER X‐band and UHF telecommunication subsystems, with emphasis on both their development and operational challenges and lessons learned. The MER spacecraft were designed, built, and tested at the Jet Propulsion Laboratory (JPL) in Pasadena, California. The MER Flight Team is located at JPL.MER has been a fantastically successful mission, with both rovers reaching Mars’ surface and embarking on explorations lasting far longer than the full mission‐success criterion of 90 sols each. The chapter discusses the MER telecom operations and performance for the primary mission and the first extended mission.

  • Synchronization challenges in deep space communications

    Deep space missions keep pushing for new frontiers affecting a wide spectrum of disciplines. To support the scientific achievements expected from new missions, communication technology is being pushed towards its limits [1]. A need to increase communication links data rate as well as to lower the operative signal-to-noise ratio (SNR) are identified. The adoption of advanced coding schemes such as turbo codes and low-density parity-check (LDPC) codes (e.g., Consultative Committee for Space Data Systems (CC-SDS) standards) allows receivers to operate at lower SNRs. However, in order to exploit the full potential of the coding gain, the receiver must be able to acquire and track a signal with a SNR much lower than expected in nominal conditions of state-of-the-art systems. The target operating point is given by the candidate LDPC codes [2], where the codeword error rate is set to WER ≤ 10-5, achieved at the bit energy to noise density ratio Eb/N0 ≥ 5.2 dB, ≥ 3.6 dB for LDPC(128,64) and LDPC(256,128), respectively. In [3] the first receiver bottleneck related with frame synchronization, a functionality required previous to channel decoding, was identified. Even though frame synchronization enhancements were proposed beyond standard correlation techniques [3], [4], [1], it was recommended to increase the synchronization word length in order to achieve the target performance. The recommendation was recently adopted by the CCSDS. In this work, the focus lies on the receiver synchronization stages (i.e., acquisition and tracking). Not only from a research standpoint, but also for the design of next generation Telemetry Tracking & Command (TT&C;) transponders, it is of capital importance to understand the performance limitations of state-of-the-art deep space communications architectures, clearly identifying possible bottlenecks and the synchronization stages (i.e., acquisition and tracking) to be improved. Digital carrier and timing synchronization have been an active research field for the past three decades in applications such as satellite-based positioning or terrestrial wireless communications systems. In those scenarios, the limitations of standard delay, frequency, and phase-locked loop (delay-locked loop, frequency-locked loop (FLL), and phase-locked loop (PLL), respectively) architectures have been clearly overcome by Kalman filter (KF) based solutions [5], which provide an inherent adaptive bandwidth, robustness, flexibility, and an optimal design methodology. Despite the advances in the field, synchronization architectures for deep space communications links, implemented in current TT&C; transponders, still rely on well-known conventional architectures, which may be insufficient if limits are pushed to extremely low SNR or harsh propagation conditions. With the advent of powerful software defined radio receivers and new system design rules, it is now possible to adopt new robust architectures that may enable going beyond the performance and reliability provided by legacy solutions.

  • Intelligent Space-Based Radio Telescope and Communication System

    In order to improve the resolution and sensitivity of present radio telescopes, an advanced system based on the distributed cooperative control is proposed here. As a space-based communication station, the system deployed in GEO is consisted of a feed source satellite, a central satellite and 4450 unit satellites in the form of precise and independent assembling. The central satellite can manage the system and diagnose the dysfunctions automatically, therefore keep the entire satellite group running correctly. Without the interference from atmosphere, cloud and ground electromagnetic wave, the system proposed can raise the quality of resolution and sensitivity by 1-2 order and greatly improve the available distance of deep-space detection and the rate of data communication.

  • Frequency-Phase Decoupling Method for Carrier Synchronization in Space Communications

    In space communications, there exist two prominent issues: large Doppler spread and limited pilot resources, which will result in poor performance for a pilot-aided (PA) traditional carrier synchronization mode (TCSM) with serial processing. In view of this, we propose a frequency-phase decoupling method (FPDM) based on an unbiased auto-correlation (AC) operator with a variable correlation delay length. By using this method, a new carrier synchronization mode (NCSM) is developed with parallel processing. Taking the classical maximum likelihood (ML) estimation as an example, both theoretical analysis and simulation results show that considering a modified generalized frame format: 1) the resulting NCSM can implement decoupling of the frequency offset estimator (FOE) and the phase offset estimator (POE) and 2) the POE of the NCSM achieves stronger ability of anti-Doppler spread and requires less complex multiplication operations compared to that of the TCSM.

  • Advanced CubeSat Antennas for Deep Space and Earth Science Missions: A Review

    None

  • Adaptive Feedback Supported Communication for IoT and Space Applications

    In deep space communication or IoT applications it could be advantageous to minimize the energy expenditures for communication from a spacecraft or wireless sensor node. In some other wireless applications it is advantageous to hide the sources of wireless communication. In this paper an adaptive feedback supported communication technique is proposed which can achieve these goals. To explain the basic building components of it, first a block coding feedback supported technique example is presented for transmission of a random variable with binomial distribution.

  • User access of space communication networks: Challenges and system analysis

    As an important infrastructure, space information network is based on platforms such as satellite, balloon and airplanes, it acquires, transfers and processes real-time information and can support ocean going, emergent rescue, navigation and spacecraft tracking, deep space exploration and dynamic, high- rate data transmission. When ground users access the space information network, the channel will be more complicated than those of ordinary space communication or terrestrial wireless communication. In this paper, a system model of ground user accessing the space networks is described. Technical challenges are analyzed and possible approaches are proposed.

  • Solar Scintillation Effects on the Deep Space Communication Performance for Radio Wave Propagation Through Non-Kolmogorov Turbulence

    Solar scintillation refers to the rapid amplitude fluctuations of the radio signal passing through large-scale coronal irregularities. In this letter, the scintillation index model is first derived to characterize radio wave propagation in coronal turbulence during superior solar conjunction. The proposed model takes into account the non-Kolmogorov turbulence model with the Rytov approximation method. After that, the bit error rate (BER) performance is analyzed based on the proposed scintillation index model, which has instructional significance for deep space communication but still remains largely unexplored. Simulation results demonstrate that the coronal parameters have extensive effects on the scintillation index, and further affect the link BER performance. Our proposed scintillation index model also achieves better agreement with the observation data.

  • Design of Turbo Codes Based on QPP Interleavers for Deep-space Communication

    The basic principle of quadratic permutation polynomial (QPP) over finite field is firstly described. Then, it is applied to turbo codes interleavers. The searching metric satisfying the permutation on interleaver coefficients is presented to improve the performance of the corresponding turbo code. The performance comparison between QPP and other algebraic interleavers is also given. Finally, a detailed turbo coding scheme is designed for deep-space communication. The simulation results show that such a scheme satisfies the requirement and can be easily implemented.



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