Receiver-level robustness concepts for EGNSS timing services

Martti Kirkko-Jaakkola, Sarang Thombre, Salomon Honkala, Stefan Söderholm, Sanna Kaasalainen, Heidi Kuusniemi, Hein Zelle, Henk Veerman, Anders Wallin, Kjell Arne Aarmo, Juan Pablo Boyero

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

GNSS-based time transfer is utilized in various critical infrastructures as it provides important advantages which are being increasingly exploited. In this paper, we present the various implementation options for robust timing service concepts based on European GNSS (EGNSS), i.e., Galileo and EGNOS, that are expected to further foster the use of EGNSS timing; this concept can make use of the redundancy of measurements and of available GNSS constellations. The stability properties of the local oscillator, which are known to the designer, are also exploited. The algorithms are developed to account for cases where several measurement faults occur simultaneously, which is a possible scenario in land-based reception conditions. Furthermore, we derive time protection level equations to quantify the integrity of the GNSS time solution as a function of the false alarm and missed detection probabilities as well as the maximum number of simultaneous outliers to be accounted for. Some of the considered fault scenarios can only be detected but not rectified by the algorithms: in such case, holdover, i.e. processing based on the local oscillator alone, is triggered. Thus, the performance in these scenarios is dependent on the stability of the local oscillator; in this paper, the analysis is based on a low-cost temperature-compensated crystal oscillator. The effect of the robustness concepts is illustrated with a set of experiments which show that when implemented in a timing GNSS receiver, the algorithms presented can deal with failures that affect individual satellites or even an entire constellation. Local disturbances affecting the receiver can also be effectively detected. Specifying EGNSS timing as proper services along with well-defined procedures for testing receiver compliance paves the road for standardizing and certifying robust EGNSS timing receivers, which would be beneficial for many applications and in particular in safety or liability critical use cases.
Original languageEnglish
Title of host publication30th International Technical Meeting of the Satellite Division of the Institute of Navigation
Subtitle of host publicationION GNSS 2017
PublisherInstitute of Navigation ION
Pages3353-3367
Number of pages15
Volume5
ISBN (Electronic)978-151-08533-1-7
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
Event30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2017 - Portland, United States
Duration: 25 Sep 201729 Sep 2017
Conference number: 30

Conference

Conference30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2017
Abbreviated titleION GNSS 2017
CountryUnited States
CityPortland
Period25/09/1729/09/17

Fingerprint

Crystal oscillators
Critical infrastructures
Redundancy
Satellites
Testing
Processing
Costs
Experiments
Temperature
Compliance

Cite this

Kirkko-Jaakkola, M., Thombre, S., Honkala, S., Söderholm, S., Kaasalainen, S., Kuusniemi, H., ... Boyero, J. P. (2017). Receiver-level robustness concepts for EGNSS timing services. In 30th International Technical Meeting of the Satellite Division of the Institute of Navigation: ION GNSS 2017 (Vol. 5, pp. 3353-3367). Institute of Navigation ION.
Kirkko-Jaakkola, Martti ; Thombre, Sarang ; Honkala, Salomon ; Söderholm, Stefan ; Kaasalainen, Sanna ; Kuusniemi, Heidi ; Zelle, Hein ; Veerman, Henk ; Wallin, Anders ; Aarmo, Kjell Arne ; Boyero, Juan Pablo. / Receiver-level robustness concepts for EGNSS timing services. 30th International Technical Meeting of the Satellite Division of the Institute of Navigation: ION GNSS 2017. Vol. 5 Institute of Navigation ION, 2017. pp. 3353-3367
@inproceedings{668e9afbf1f747aab01e040a420e458b,
title = "Receiver-level robustness concepts for EGNSS timing services",
abstract = "GNSS-based time transfer is utilized in various critical infrastructures as it provides important advantages which are being increasingly exploited. In this paper, we present the various implementation options for robust timing service concepts based on European GNSS (EGNSS), i.e., Galileo and EGNOS, that are expected to further foster the use of EGNSS timing; this concept can make use of the redundancy of measurements and of available GNSS constellations. The stability properties of the local oscillator, which are known to the designer, are also exploited. The algorithms are developed to account for cases where several measurement faults occur simultaneously, which is a possible scenario in land-based reception conditions. Furthermore, we derive time protection level equations to quantify the integrity of the GNSS time solution as a function of the false alarm and missed detection probabilities as well as the maximum number of simultaneous outliers to be accounted for. Some of the considered fault scenarios can only be detected but not rectified by the algorithms: in such case, holdover, i.e. processing based on the local oscillator alone, is triggered. Thus, the performance in these scenarios is dependent on the stability of the local oscillator; in this paper, the analysis is based on a low-cost temperature-compensated crystal oscillator. The effect of the robustness concepts is illustrated with a set of experiments which show that when implemented in a timing GNSS receiver, the algorithms presented can deal with failures that affect individual satellites or even an entire constellation. Local disturbances affecting the receiver can also be effectively detected. Specifying EGNSS timing as proper services along with well-defined procedures for testing receiver compliance paves the road for standardizing and certifying robust EGNSS timing receivers, which would be beneficial for many applications and in particular in safety or liability critical use cases.",
author = "Martti Kirkko-Jaakkola and Sarang Thombre and Salomon Honkala and Stefan S{\"o}derholm and Sanna Kaasalainen and Heidi Kuusniemi and Hein Zelle and Henk Veerman and Anders Wallin and Aarmo, {Kjell Arne} and Boyero, {Juan Pablo}",
year = "2017",
language = "English",
volume = "5",
pages = "3353--3367",
booktitle = "30th International Technical Meeting of the Satellite Division of the Institute of Navigation",
publisher = "Institute of Navigation ION",
address = "United States",

}

Kirkko-Jaakkola, M, Thombre, S, Honkala, S, Söderholm, S, Kaasalainen, S, Kuusniemi, H, Zelle, H, Veerman, H, Wallin, A, Aarmo, KA & Boyero, JP 2017, Receiver-level robustness concepts for EGNSS timing services. in 30th International Technical Meeting of the Satellite Division of the Institute of Navigation: ION GNSS 2017. vol. 5, Institute of Navigation ION, pp. 3353-3367, 30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2017, Portland, United States, 25/09/17.

Receiver-level robustness concepts for EGNSS timing services. / Kirkko-Jaakkola, Martti; Thombre, Sarang; Honkala, Salomon; Söderholm, Stefan; Kaasalainen, Sanna; Kuusniemi, Heidi; Zelle, Hein; Veerman, Henk; Wallin, Anders; Aarmo, Kjell Arne; Boyero, Juan Pablo.

30th International Technical Meeting of the Satellite Division of the Institute of Navigation: ION GNSS 2017. Vol. 5 Institute of Navigation ION, 2017. p. 3353-3367.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Receiver-level robustness concepts for EGNSS timing services

AU - Kirkko-Jaakkola, Martti

AU - Thombre, Sarang

AU - Honkala, Salomon

AU - Söderholm, Stefan

AU - Kaasalainen, Sanna

AU - Kuusniemi, Heidi

AU - Zelle, Hein

AU - Veerman, Henk

AU - Wallin, Anders

AU - Aarmo, Kjell Arne

AU - Boyero, Juan Pablo

PY - 2017

Y1 - 2017

N2 - GNSS-based time transfer is utilized in various critical infrastructures as it provides important advantages which are being increasingly exploited. In this paper, we present the various implementation options for robust timing service concepts based on European GNSS (EGNSS), i.e., Galileo and EGNOS, that are expected to further foster the use of EGNSS timing; this concept can make use of the redundancy of measurements and of available GNSS constellations. The stability properties of the local oscillator, which are known to the designer, are also exploited. The algorithms are developed to account for cases where several measurement faults occur simultaneously, which is a possible scenario in land-based reception conditions. Furthermore, we derive time protection level equations to quantify the integrity of the GNSS time solution as a function of the false alarm and missed detection probabilities as well as the maximum number of simultaneous outliers to be accounted for. Some of the considered fault scenarios can only be detected but not rectified by the algorithms: in such case, holdover, i.e. processing based on the local oscillator alone, is triggered. Thus, the performance in these scenarios is dependent on the stability of the local oscillator; in this paper, the analysis is based on a low-cost temperature-compensated crystal oscillator. The effect of the robustness concepts is illustrated with a set of experiments which show that when implemented in a timing GNSS receiver, the algorithms presented can deal with failures that affect individual satellites or even an entire constellation. Local disturbances affecting the receiver can also be effectively detected. Specifying EGNSS timing as proper services along with well-defined procedures for testing receiver compliance paves the road for standardizing and certifying robust EGNSS timing receivers, which would be beneficial for many applications and in particular in safety or liability critical use cases.

AB - GNSS-based time transfer is utilized in various critical infrastructures as it provides important advantages which are being increasingly exploited. In this paper, we present the various implementation options for robust timing service concepts based on European GNSS (EGNSS), i.e., Galileo and EGNOS, that are expected to further foster the use of EGNSS timing; this concept can make use of the redundancy of measurements and of available GNSS constellations. The stability properties of the local oscillator, which are known to the designer, are also exploited. The algorithms are developed to account for cases where several measurement faults occur simultaneously, which is a possible scenario in land-based reception conditions. Furthermore, we derive time protection level equations to quantify the integrity of the GNSS time solution as a function of the false alarm and missed detection probabilities as well as the maximum number of simultaneous outliers to be accounted for. Some of the considered fault scenarios can only be detected but not rectified by the algorithms: in such case, holdover, i.e. processing based on the local oscillator alone, is triggered. Thus, the performance in these scenarios is dependent on the stability of the local oscillator; in this paper, the analysis is based on a low-cost temperature-compensated crystal oscillator. The effect of the robustness concepts is illustrated with a set of experiments which show that when implemented in a timing GNSS receiver, the algorithms presented can deal with failures that affect individual satellites or even an entire constellation. Local disturbances affecting the receiver can also be effectively detected. Specifying EGNSS timing as proper services along with well-defined procedures for testing receiver compliance paves the road for standardizing and certifying robust EGNSS timing receivers, which would be beneficial for many applications and in particular in safety or liability critical use cases.

UR - http://www.scopus.com/inward/record.url?scp=85047846079&partnerID=8YFLogxK

M3 - Conference article in proceedings

VL - 5

SP - 3353

EP - 3367

BT - 30th International Technical Meeting of the Satellite Division of the Institute of Navigation

PB - Institute of Navigation ION

ER -

Kirkko-Jaakkola M, Thombre S, Honkala S, Söderholm S, Kaasalainen S, Kuusniemi H et al. Receiver-level robustness concepts for EGNSS timing services. In 30th International Technical Meeting of the Satellite Division of the Institute of Navigation: ION GNSS 2017. Vol. 5. Institute of Navigation ION. 2017. p. 3353-3367