Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

20010023138 Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA USA
Mars Communication Protocols
Kazz, G. J., Jet Propulsion Lab., California Inst. of Tech., USA; Greenberg, E., Jet Propulsion Lab., California Inst. of Tech., USA;
Concepts and Approaches for Mars Exploration; July 2000, Part 1, pp. 172-173; In English; See also 20010023036; No Copyright;
Avail: CASI; A01, Hardcopy; A03, Microfiche
Over the next decade, international plans and commitments are underway to develop an infrastructure at Mars to support
future exploration of the red planet. The purpose of this infrastructure is to provide reliable global communication and navigation
coverage for on-approach, landed, roving, and in-flight assets at Mars. The claim is that this infrastructure will: 1) eliminate the
need of these assets to carry Direct to Earth (DTE) communications equipment, 2) significantly increase data return and connectivity,
3) enable small mission exploration of Mars without DTE equipment, 4) provide precision navigation i.e., 10 to 100m position
resolution, 5) supply timing reference accurate to 10ms. This paper in particular focuses on two CCSDS recommendations for
that infrastructure: CCSDS Proximity-1 Space Link Protocol and CCSDS File Delivery Protocol (CFDP). A key aspect of Mars
exploration will be the ability of future missions to interoperate. These protocols establish a framework for interoperability by
providing standard communication, navigation, and timing services. In addition, these services include strategies to recover gracefully
from communication interruptions and interference while ensuring backward compatibility with previous missions from previous
phases of exploration.
Derived from text
Mars Exploration; Communication Networks; Protocol (Computers); Interplanetary Communication
20010023277 Lembaga Penerbangan dan Antariksa Nasional, HF Communications, Jakarta, Indonesia
Empirical Relations Between f(0)F2 Frequencies and Sunspot Numbers (R) and Degrees of Longitude (Lambda) at Certain
Latitudes Above Indonesia Hubungan Empiris Antara Frekuensi f(0)F2 Dengan Bilangan Sunspot (R) Dan Derajat
Bujur (Lambda) Pada Lintang Tertentu Di Atas Indonesia
Budiyanto, Lembaga Penerbangan dan Antariksa Nasional, Indonesia; Muslim, Buldan, Lembaga Penerbangan dan Antariksa
Nasional, Indonesia; Habirun, Lembaga Penerbangan dan Antariksa Nasional, Indonesia; Suparman, Lembaga Penerbangan dan
Antariksa Nasional, Indonesia; Warta LAPAN; October 2000; ISSN 0126-9754; Volume 2, No. 4, pp. 159-164; In Malay-Indonesian;
Copyright; Avail: Issuing Activity
Determination of frequency f0F2 of the ionosphere over regions that can not be covered by vertical ionosonde monitoring
is carried out through the empirical relationship between frequency f0F2 and sunspot number R with longitude lambda at a certain
altitude. Especially on equator psi = 0 over Indonesian region the empirical relation is f0F2 = (14.6261 - 0.0441 * lambda) - (0.0357
- 0.0004 * lambda) * R with (14.6261 - 0.0441 * lambda) and (0.0357 - 0.0004 * lambda) is empirical relationship between regression
parameter with lambda (longitude) in Indonesian region. This empirical relationship have mean error 3.39%. by the empirical
relation, on the position of (0,lambda) with certain lambda and R known by prediction, we get prediction frequency f0F2 on that
position. Finally it can be determine frequency HF communication through that region.
Author
F 2 Region; Critical Frequencies; Indonesia
20010023428 General Accounting Office, Office of the Controller General, Washington, DC USA
Decision: Federal Communications Commission; Installation of Integrated Services Digital Network Lines
Jan. 12, 1999; 10p; In English
Report No.(s): PB2001-102232; No Copyright; Avail: CASI; A01, Microfiche; A02, Hardcopy
Section 1348(a)(1) of title 31, USA Code, prohibits the use of appropriated funds for the installation of telephones and for
charges for telephone and for charges for telephone service from private residences. The authors have not applied 31 U.S.C. section
1348 where the telephone services is one of restricted use or involves adequate safeguards and the separate service is essential.
Accordingly, the authors would not object to the Federal Communications Commission’s (FCC) installation of dedicated Integrated
Services Digital Network (ISDN) lines to transmit data from computers in the private residences of the FCC Commissioners
to the agency’s local area network. The FCC has imposed adequate safeguards to prevent private use of separate ISDN lines and
to protect communications to and from the FCC Commissioners.
NTIS
Communication Networks; Digital Systems; Installing; Telecommunication; Telephones
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