L1C Signal Design Options

Betz, John W.; Cahn, C. R.; Dafesh, P. A.; Hegarty, Christopher; Hudnut, K. W.; Jones, Amanda J; Keegan, Richard; Kovach, Karl; Lenahan, L.S.; Howard, H. Craig

doi:10.21236/ada456355

Cited by 23 publications

(10 citation statements)

References 5 publications

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“…AltB oc or BOC (3, Z) (t) = VBOC2 (3,1,a=1) (t) 10. TM Bocfl z (t) = ( ml , mZ , n Z ) TM vBOC 1 ZPZ (t) , ( m l, mZ , n Z ,al =o,a z ={O,l}) 11. The same argument can be said about CBOC or MBOC.…”

Section: Althoughmentioning

confidence: 88%

See 1 more Smart Citation

On generalized multidimensional geolocation modulation waveforms

Progri

2012

Proceedings of the 2012 IEEE/ION Position, Location and Navigation Symposium

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Section: Althoughmentioning

confidence: 88%

“…Union (ITU) for a standardization of GNSS or geolocation waveforms in the S-band (2)(3)(4) [1), (27), C-band (4-8 GHz) [1), (26), and X-band (8)(9)(10)(11)(12) GHz) [1).…”

Section: International Telecommunicationsmentioning

confidence: 99%

On generalized multidimensional geolocation modulation waveforms

Progri

2012

Proceedings of the 2012 IEEE/ION Position, Location and Navigation Symposium

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“…we obtain (12). The proof of (13), (14), and (15) are pretty straight forward also. When we have for hence (13).…”

Section: Generalized Acf Definition and Discussionmentioning

confidence: 59%

VBOC1(a) Generalized Multidimensional Geolocation Modulation Waveforms

Progri¹

2015

J. Geolo. Geo-inf. Geo-int.

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, except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use of the publication of trade names, trademarks, service marks, or similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. This paper presents the complete original definition of first generation Variable Binary Offset Carrier VBOC1(α) generalized multidimensional geolocation modulation waveforms, to improve the standardization of the United States DoD GPS, European Galileo, Russian GLONASS, Chinese Compass, Indian IRNSS in the L-band (1-2 GHz), and the United Nations International Telecommunications Union (ITU) GNSS or geolocation waveforms in the S-band (2-4 GHz) and C-band (4-8 GHz). In the paper it is argued that the selection of BOC(1,1) on the GPS L1 civil data code and BOC(10,5) (or the military code or M-Code) on both GPS L1 and L2 frequencies is entirely arbitrary because BOC modulation is a special case of for or ; hence, all the current state-of-the-art GNSS waveforms exhibit sub-optimal signal design performance even at the end-user when generalized global objective functions are applied. pure signal design or broad definition of generalized autocorrelation function (ACF) and power spectral density (PSD) offers a unique signal design methodology and provides the necessary framework for ACF pure signal optimization to fill in substantial signal design gaps; hence, improving the GNSS signal design and standardization.

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“…It appears that VBOC(2,1,0.1) could be a better candidate than the currently suggested TMBOC(6,1,4/33) (see [3]) because it achieves similar main autocorrelation peak as the smaller out of phase autocorrelation peaks.…”

Section: Discussionmentioning

confidence: 91%

A Theoretical Survey of the Spreading Modulation of the New GPS Signals (L1C, L2C, and L5)

Progri¹,

Bromberg²,

Michalson

et al. 2017

J. Geolo. Geo-inf. Geo-int.

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In this paper a survey of the spreading modulation of the new GPS signals (L1C, L2C, and L5) is considered. The new signals seem to offer several improvements which range from higher power, better code selection, and improved modulation schemes which offer receiver designers the opportunity to obtain unmatched performance in many ways such as in the case of a maximum likelihood GPS receiver. For example the Multiplexed Binary Offset Carrier (MBOC) spreading modulation has been recommended by the GPS-GALILEO Working Group on interoperability and compatibility because the MBOC(6,1,1/11) power spectral density is a mixture of BOC(1,1) spectrum and BOC(6,1) spectrum, that would be used by GALILEO for its Open Service (OS) signal at L1 frequency, and also by GPS for its modernized L1 Civil (L1C) signal. It is suggested that a number of different time waveforms can produce the MBOC(6,1,1/11) spectrum, allowing flexibility in implementation and maintaining interoperable waveforms for GALILEO and GPS. On the other hand, the time-multiplexed BOC (TMBOC) implementation interlaces BOC(6,1) and BOC(1,1) spreading symbols in a regular pattern, whereas composite BOC (CBOC) uses multilevel spreading symbols formed from the weighted sum of BOC(1,1) and BOC(6,1) spreading symbols, interplexed to form a constant modulus composite signal. New L1C provides a number of advanced features, which includes 75% of the power in a pilot component for enhanced signal tracking, advanced Weil-based spreading codes, an overlay code on the pilot that provides data message synchronization, support for improved reading of clock and ephemeris by combining message symbols across messages, advanced forward error control coding, and data symbol interleaving to combat fading. The resulting design offers receiver designers the opportunity to obtain a greatly improved performance in many ways. In this paper we perform a theoretical survey of the new signals and suggest a new code spreading modulation scheme which could provide even further improvements to the new GPS III signals.

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L1C Signal Design Options

Cited by 23 publications

References 5 publications

On generalized multidimensional geolocation modulation waveforms

On generalized multidimensional geolocation modulation waveforms

VBOC1(a) Generalized Multidimensional Geolocation Modulation Waveforms

A Theoretical Survey of the Spreading Modulation of the New GPS Signals (L1C, L2C, and L5)

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