NDLI: Direct-Y and it's impact on user equipment technology

Content Provider	IEEE Xplore Digital Library
Author	Vittorini, L.D.
Copyright Year	1998
Description	Author affiliation: Rockwell Collins, Cedar Rapids, IA, USA (Vittorini, L.D.)
Abstract	It has become evident that GPS must undergo evolutionary changes in order to fully satisfy both civil and military requirements in the next century. Currently, the military must improve the antijam performance of the system to ensure its availability for precision delivery of weapons and general navigation functions in the battlefield. A key component to this strategy is reducing the military's reliance on C/A code to acquire the GPS signal via a direct acquisition of the encrypted Y code. Currently fielded UE/sup 2/ have notable deficiencies which must be remedied before robust D-Y acquisition performance in the face of jamming can be achieved. Since the Y-code is essentially infinite in length (vice 1 msec C/A code), the frequency and code phase error must either be reduced considerably or the resultant uncertainties searched quicker. It turns out the most practical solution involves components in both domains (frequency and code phase) and both involve application of improved UE technologies to effect a quick D-Y acquisition in a jammed environment. The terminology proposed by the JPO and generally adopted to describe this process has come to be known as D-Y which stands for "Direct-Y Acquisition". This paper will highlight two key technologies in the areas of VLSI technology and low power timekeeping and formulate some credible simulation models to describe D-Y performance for the next generation of advanced user equipment. Some discussion of improved signal structures will also be included.
Starting Page	218
Ending Page	227
File Size	1098862
Page Count	10
File Format	PDF
ISBN	0780343301
DOI	10.1109/PLANS.1998.670045
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-04-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Jamming Availability Weapons Navigation Cryptography Robustness Frequency Uncertainty Terminology
Content Type	Text
Resource Type	Article

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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