NDLI: Combined GMSK Modulation and PN Ranging for Communications and Navigation

Content Provider	IEEE Xplore Digital Library
Author	Orr, R.S. Divsalar, D.
Copyright Year	2008
Description	Author affiliation: SATEL LLC, Rockville, MD (Orr, R.S.)
Abstract	Renewed interest in human exploration of space suggests a future need for high throughput earth-space links. Anticipating crowding within spectrum used for deep- space communications, particularly at X-band, NASA is investigating the use of bandwidth-efficient modulation (BEM). Requirements for trajectory/orbit determination and vehicle guidance will persist, however, implying that signals for radiometric tracking must coexist with communications within the available spectrum. Because navigation signals in current use may be insufficiently compatible with BEM, the question arises as to how to combine ranging and BEM communications. This paper presents one waveform approach potentially applicable to the space-to-earth return link problem. GMSK modulation is combined with a pseudonoise (PN) ranging signal on a subcarrier. Waveform parameters are adjusted to achieve: (1) a constant-envelope waveform; (2) adequate separation between the communications and ranging components; (3) high data rates (~ 6 Msps); and (4) conformance to international standards such as Space Frequency Coordination Group (SFCG). We define the waveform, present its power spectrum, exhibit receiver structures for simultaneous GMSK data demodulation and PN tracking for accurate time-of-arrival estimation, and show relationships among the waveform parameters that must hold to satisfy the demands of applicable standards.
Starting Page	1
Ending Page	18
File Size	5999619
Page Count	18
File Format	PDF
ISBN	9781424414871
ISSN	1095323X
DOI	10.1109/AERO.2008.4526351
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space exploration Humans Throughput NASA Trajectory Vehicles Radiometry Radio navigation Communication standards Frequency
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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