2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC)最新文献

Non-Coherent Receiver Design for MFSK Modulations in Deep Space Missions 深空MFSK调制的非相干接收机设计

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975783

J. Gómez-Vilardebó, X. Mestre, M. Navarro, J. F. Sevillano, R. Abello, Jorge Quintanilla

引用次数: 0

Application of List Viterbi Algorithms to Improve the Performance in Space Missions using Convolutional Codes 列表Viterbi算法在卷积码空间任务中的应用

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975785

Riccardo Schiavone, R. Garello, G. Liva

{"title":"Application of List Viterbi Algorithms to Improve the Performance in Space Missions using Convolutional Codes","authors":"Riccardo Schiavone, R. Garello, G. Liva","doi":"10.1109/TTC55771.2022.9975785","DOIUrl":"https://doi.org/10.1109/TTC55771.2022.9975785","url":null,"abstract":"Currently, several space missions are still using convolutional codes, which are among the available coding options of the CCSDS telemetry recommendation. When convolutional codes are employed, the CCSDS specification mandates the use of an outer CRC code to perform error detection over the transfer frame. Alternatively, the CRC code may be used, together with list Viterbi decoding of the inner convolutional code, to significantly improve the performance of the coding scheme. In this paper, we first compute the distance spectrum of the concatenation of the outer CRC code and the inner convolutional codes recommended by the CCSDS. By means of a union bound on the block error probability under maximum-likelihood decoding, we estimate the extra coding gain achievable by the concatenation with respect to the use of the Viterbi algorithm applied to the decoding of the inner convolutional code only. The extra coding gain is close to 3 dB. Then, we consider the application of the list Viterbi algorithm and we discuss some techniques useful to reduce its complexity in practical implementations. Results show that it is possible to approach the 3 dB extra coding gain with negligible increase in the decoding complexity with respect to Viterbi decoding of the inner convolutional code.","PeriodicalId":303926,"journal":{"name":"2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122506657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Non-coherent Receivers for Low Data Rate Transmissions under Weak Solar Scintillation 弱太阳闪烁下低数据速率传输的非相干接收机

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975789

X. Mestre, J. Gomez, M. Navarro, J. F. Sevillano, R. Abello, Jorge Quintanilla

引用次数: 1

CCSDS 131.2-B-1 Software Defined Radio receiver featuring GPU accelerators: up to 1000x with respect to CPU implementation. CCSDS 131.2-B-1软件定义无线电接收机，具有GPU加速器:相对于CPU实现高达1000倍。

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975788

Roberto Ciardi, Gianluca Giuffrida, Matteo Bertolucci, Emanuele Pagani, L. Fanucci

{"title":"CCSDS 131.2-B-1 Software Defined Radio receiver featuring GPU accelerators: up to 1000x with respect to CPU implementation.","authors":"Roberto Ciardi, Gianluca Giuffrida, Matteo Bertolucci, Emanuele Pagani, L. Fanucci","doi":"10.1109/TTC55771.2022.9975788","DOIUrl":"https://doi.org/10.1109/TTC55771.2022.9975788","url":null,"abstract":"Nowadays the number of Earth Observation missions are exponentially increasing. Each satellite may embark payloads which produce a big amount of data, that need to be transmitted on-ground. To address large data transmissions, proper of this kind of missions, CCSDS 131.2-B standard has been developed. A limiting factor in the adoption of this communication system is represented by the complexity of the hardware required for running a receiver in real time. Software Defined Radio (SDR) receivers represent a potential low-cost solution when dealing with scientific data or low-medium-data rate. In this perspective, we present in this paper the implementation of an SDR dedicated to CCSDS 131.2-B. In particular, this software was designed following the Single Instruction Multiple Data paradigm to speed up the reception and data processing, exploiting the so called General Purpose-Graphic Processing Unit (GP-GPU). The entire software has been designed to be completely modular, i.e., allowing to easily add/modify each block in the reception chain. The preliminary results of the adoption of this SDR as a CCSDS 131.2-B receiver, has shown excellent performance, maintaining a throughput up to 10 MBaud for ACM 1-7. This throughput can be easily increased exploiting parallelism at decoder level, hence linearly increasing the SDR performance, up to the GP-GPU memory filling. The proposed solution is designed to be a game changer and a potential flagship killer for such missions wich requirements are relaxed in term of throughput.","PeriodicalId":303926,"journal":{"name":"2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122882778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reference data and procedures for ground atmospheric radiometry for European Space Agency stations and campaigns 欧洲空间局站和活动地面大气辐射测量的参考数据和程序

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975786

S. Nilo, D. Cimini, S. Gentile, S. Larosa, A. Martellucci, M. Fetescu, J. Villalvilla, F. Romano

{"title":"Reference data and procedures for ground atmospheric radiometry for European Space Agency stations and campaigns","authors":"S. Nilo, D. Cimini, S. Gentile, S. Larosa, A. Martellucci, M. Fetescu, J. Villalvilla, F. Romano","doi":"10.1109/TTC55771.2022.9975786","DOIUrl":"https://doi.org/10.1109/TTC55771.2022.9975786","url":null,"abstract":"Reference data and procedures for ground atmospheric radiometry for European Space Agency stations and campaigns activities are designed and presented. The work aims to create a database of reference long-term simulations of atmospheric brightness temperature for monitoring radiometric accuracy and calibration and for developing retrieval algorithms to be used in the operations of European Space Agency ground-based microwave radiometers for atmospheric characterization. This network includes instruments at ESTRACK stations for space exploration missions, long-term monitoring measurements for radar altimetry and Earth Observation Ka band data downlink. All these campaigns are intended to collect long-term data of atmospheric propagation parameters which are needed for the design and operation of radio communication links at Ka, Q, V and W bands for both geostationary and non-geostationary missions. The work specifically concerned the definition of the input data and reference algorithms as well as the developing of the software procedures and the derivation of the reference dataset. Here, the theoretical framework, the designed procedures and results are presented.","PeriodicalId":303926,"journal":{"name":"2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122593450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time transfer and orbit determination for a Martian navigation system based on smallsats 基于小卫星的火星导航系统的时间传递和轨道确定

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975787

S. Molli, G. Boscagli, M. D. Benedetto, D. Durante, Luca Vigna, L. Iess

{"title":"Time transfer and orbit determination for a Martian navigation system based on smallsats","authors":"S. Molli, G. Boscagli, M. D. Benedetto, D. Durante, Luca Vigna, L. Iess","doi":"10.1109/TTC55771.2022.9975787","DOIUrl":"https://doi.org/10.1109/TTC55771.2022.9975787","url":null,"abstract":"We present a novel mission concept that can be used to support a near-autonomous navigation of different kind of users, such as rovers or landers in EDL (entry, descent and landing) phase, operating in the martian environment. We propose a constellation of 5 small satellites in polar orbits able to acquire their position in a Mars-fixed reference frame with minimal support from Earth thanks to a high accuracy Doppler system enabled by a novel inter-satellite link (ISL) communication architecture. The high quality of range rate measurements relies on radio link architectures able to suppress the adverse effects of on-board clock instabilities. Periodic synchronisation of the main spacecraft (mothercraft) with Earth UTC/TAI is enabled through a direct link to Earth, while the synchronization within the constellation is performed individually between each mothercraft-daughtercraft pair through the ISL, using a novel approach based on two-way coherent ranging measurements. The current orbital configuration provides mainly a regional coverage, but the navigation service could be easily expanded to cover the entire planet. In this work, we describe the overall system architecture and the time synchronization techniques, resulting from a tradeoff conducted both by analysis and numerical simulations, in terms of positional accuracy, reuse of the existing ground infrastructure, TRL of the onboard RF instrumentation and cost. We show that this navigation system, based on a simple and low-cost architecture, can autonomously reconstruct the trajectories of its nodes with $sim$10 meters accuracy (3a, worst case) and can achieve a time synchronization accuracy at ns level, being on target to provide meter-level positioning service to a variety of end users.","PeriodicalId":303926,"journal":{"name":"2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125513466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A CCSDS 131.2-B compliant telemetry downlink hardware-software emulation platform for next-generation Earth observation missions 一种符合CCSDS 131.2-B标准的下一代地球观测任务遥测下行硬件软件仿真平台

2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC) Pub Date : 2022-11-28 DOI: 10.1109/TTC55771.2022.9975784

Emanuele Pagani, Roberto Ciardi, Gionata Benelli, Matteo Bertolucci, Francesco Falaschi, Riccardo Cassettari, L. Fanucci, Andrea Modenini

{"title":"A CCSDS 131.2-B compliant telemetry downlink hardware-software emulation platform for next-generation Earth observation missions","authors":"Emanuele Pagani, Roberto Ciardi, Gionata Benelli, Matteo Bertolucci, Francesco Falaschi, Riccardo Cassettari, L. Fanucci, Andrea Modenini","doi":"10.1109/TTC55771.2022.9975784","DOIUrl":"https://doi.org/10.1109/TTC55771.2022.9975784","url":null,"abstract":"During the last few years, the throughput requirements of payload data telemetry (PDT) systems for Earth observation (EO) satellites have increased considerably. The CCSDS 131.2-B standard, issued in 2012, has already proven to be a sound solution for high-rate telemetry applications, especially when link adaptation techniques are required to cope with variable channel conditions. In particular, this standard and the adaptive coding and modulation (ACM) technique that it inherently supports could be adopted in the forthcoming Copernicus missions, which pose new challenges to PDT regarding throughput requirements. Since systems with comparable performance have never been deployed, a comprehensive test environment is needed to carry out a thorough validation phase.This paper presents a CCSDS 131.2-B ACM testbed that implements an end-to-end communication system for telemetry data downlink from a low Earth orbit (LEO) satellite, supporting symbol rates up to 500 MBaud. Including the emulation of a Sun-synchronous orbit (SSO) and the main channel impairments encountered in a Ka-band transmission, this testbed aims to accurately model the data flow of future EO missions. Furthermore, by allowing a comprehensive evaluation of the link performance, it turns out to be an effective tool for supporting system design and fine tuning of link adaptation strategies.","PeriodicalId":303926,"journal":{"name":"2022 9th International Workshop on Tracking, Telemetry and Command Systems for Space Applications (TTC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128740347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0