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Elevation Angle, α Table D-2. Peak Power Calculations (bold values are input data) Parameter Name Units Value Earth Radius km 6378.14 SC Altitude km 400 SC Ant Gain dBi 5 Symbol Rate bps 3.08E+06 RF Power W dBW 1 0.0 Peak PSD dBW/Hz dBW/4kHz -64.9 -28.9 Table D-3. Calculation of PFD at All Arrival Angles Spacecraft Look Angle, β(α) Earth Central Angle, φ(α) Spacecraft Range, R(α) Peak PFD on Earth PFD Limit PFD limit Exceedance degrees degrees degrees km dBW/m 2 / 4 kHz dBW/m 2 / 4 kHz dB 0 70.2 19.8 2294.0 -162.1 -154.0 -8.1 5 69.6 15.4 1804.5 -160.0 -154.0 -6.0 10 67.9 12.1 1439.8 -158.0 -151.5 -6.5 15 65.4 9.6 1175.5 -156.3 -149.0 -7.3 20 62.2 7.8 984.2 -154.7 -146.5 -8.2 25 58.5 6.5 844.0 -153.4 -144.0 -9.4 30 54.6 5.4 739.4 -152.2 -144.0 -8.2 35 50.4 4.6 659.8 -151.2 -144.0 -7.2 40 46.1 3.9 598.2 -150.4 -144.0 -6.4 45 41.7 3.3 549.9 -149.7 -144.0 -5.7 50 37.2 2.8 511.7 -149.0 -144.0 -5.0 55 32.7 2.3 481.4 -148.5 -144.0 -4.5 60 28.1 1.9 457.4 -148.1 -144.0 -4.1 65 23.4 1.6 438.6 -147.7 -144.0 -3.7 70 18.8 1.2 424.0 -147.4 -144.0 -3.4 75 14.1 0.9 413.2 -147.2 -144.0 -3.2 80 9.4 0.6 405.8 -147.0 -144.0 -3.0 85 4.7 0.3 401.4 -146.9 -144.0 -2.9 90 0.0 0.0 400.0 -146.9 -144.0 -2.9 Revision 10 D-10 450-<strong>SN</strong>UG
PFD (dBW/m^2/4kHz) -142 -144 -146 -148 -150 -152 -154 -156 -158 -160 -162 -164 0 10 20 30 40 50 60 70 80 90 Elevation Angle (degrees) Peak PFD on Earth PFD Limit Figure D-3. Plot of PFD Limit and Actual PFD for All Arrival Angles D.4 Unwanted Emissions This section describes the regulations and recommendations concerning unwanted emissions. The Radio Regulations define unwanted emissions as all emissions outside the necessary bandwidth and includes both emissions resulting from the modulation process and spurious emissions. The necessary bandwidth is a two-sided bandwidth and is defined as follows for a given class of emission: “the width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under specified conditions.” For space telecommunication links, GSFC missions generally record the necessary bandwidth as the bandwidth that is just sufficient to contain the mainlobe of the signal spectrum. For TDRSS links, the necessary bandwidth is twice the highest baud rate on either channel. Paragraph D.4.1 describes the unwanted emission regulations given in the NTIA manual. Paragraph D.4.2 provides examples for the calculation of NTIA emission masks. Paragraph D.4.3 describes the ITU-R recommendations on unwanted emissions. Revision 10 D-11 450-<strong>SN</strong>UG
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452 / Space Network Project 450-SNU
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Space Network Users’ Guide (SNUG)
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Preface The Space Network Users’
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Change Information Page List of Eff
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Table of Contents Section 1. Introd
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6.2.5 Real-Time Configuration Chang
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Appendix B. Functional Configuratio
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Appendix J. Customer Constraints fo
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Figure 10-5. NCCDS/NEST Scheduling
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Figure B-6. Customer Platform Funct
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NASA Standard Transponder .........
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Table B-3. Data Configuration Const
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1.1 Purpose and Scope Section 1. In
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Section/ Appendix Table 1-1. Docume
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S SN Future Services Describes futu
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Many of the links require access to
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Revision 10 1-9 450-SNUG https://co
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Section 2. SN Overview 2.1 General
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Revision 10 2-3 450-SNUG Customer P
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Multiple Access Antenna • 30 elem
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Table 2-1. Example of TDRS Constell
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services. The detailed TDRS spacecr
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Average Coverage (%) 100 95 90 85 8
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quality. For further information on
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3.1 General Section 3. Services Ava
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Revision 10 3-3 450-SNUG MA (note 1
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Table 3-2 provides an overview of t
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Revision 10 3-7 450-SNUG TDRS G/T (
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Data Group and Mode (note 4) Table
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platforms to have SA support on one
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a TDRS. Compatibility testing is pe
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NASA-unique 4800 bit block and then
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Revision 10 3-17 450-SNUG Table 3-4
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the Space Network's ability to supp
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4.1 Overview Section 4. Obtaining S
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5.1 General Section 5. MA Telecommu
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an appropriate forward service has
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Table 5-1. TDRSS MA Forward PSK Ser
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NOTE: Customers who operate in a SS
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Table 5-3. Salient Characteristics
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e. The customer platform receiving
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DG1 (note 1) Table 5-6. TDRSS MA Re
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Table 5-6. TDRSS MA Return Service
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platform transmit frequency for non
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configurations, the I-Q channel amb
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Acquisition (note 3) (cont’d): Ta
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d. After symbol/decoder and symbol/
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Section 3, paragraph 3.5 for guidel
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5.3.3.4 Reacquisition While in the
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5.3.5 Acquisition Scenarios The fol
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d. DG2 Mode Transitions. 1. DG2 non
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6.1 General Section 6. SSA Telecomm
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6.2.2 PSK Signal Parameters The TDR
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Table 6-1. TDRSS SSA Forward PSK Se
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6.2.2.2 BPSK Signal Parameters a. B
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unless the customer is utilizing th
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Table 6-2. TDRSS SSA Forward Phase
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Table 6-3. TDRSS SSA Forward Servic
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d. The customer platform receiving
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DG1 (note 1) Table 6-7. TDRSS SSA R
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Table 6-7. TDRSS SSA Return Service
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6.3.2.2 DG1 Signal Parameters DG1 s
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and signal characteristics specifie
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3. Balanced Power Single Data Sourc
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and an ephemeris uncertainty as def
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Table 6-11. SSA Return Service Real
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2. DG1 Mode 1 (or 3) to DG1 Mode 2
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Table 6-12. TDRSS SSA Return Servic
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service is supported through TDRS F
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Table 6-14. TDRS SSAR IF Service Sp
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7.1 General Section 7. KuSA Telecom
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c. Frequency Sweep on the Forward L
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Table 7-1. TDRSS KuSA Forward Servi
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7.2.5 Acquisition Scenarios The fol
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Table 7-4. KuSA Forward Service Rea
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Table 7-5. TDRSS KuSA Return Servic
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. SQPSK Modulation. SQPSK modulatio
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7.3.2.3 DG2 Signal Parameters DG2 s
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Revision 10 7-21 450-SNUG Dual Data
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code and carrier acquisition will b
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identical data) having unbalanced I
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acquisition, the process should tra
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Table 7-8. KuSA Return Service Real
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egins) or by its customer platform
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Reconfiguration and reacquisition b
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7.3.6 225 MHz IF Service This secti
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Table 7-11. TDRS KuSAR IF Service S
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7.3.6.3 Potential Signal Performanc
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8.1 General Section 8. KaSA Telecom
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8.2 KaSA Forward Services 8.2.1 Gen
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Table 8-1. TDRSS KaSA Forward Servi
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c. Asynchronous Data Modulation. Fo
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Table 8-2. TDRSS KaSA Forward Servi
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in Table 8-1. The EIRP directed tow
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Table 8-5. TDRSS KaSA Return 225 MH
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Single Data Source Dual Data Source
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Revision 10 8-21 450-SNUG Acquisiti
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8.3.3.2 Bit Error Rate (BER) Table
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d. Loss of Autotrack. Loss of autot
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Table 8-8. KaSA Return Service Real
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noncoherent transmissions are desir
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Table 8-9. TDRSS KaSA Return 225 MH
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Changes to the operating conditions
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Table 8-11. TDRS KaSAR 225 MHz and
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Section 9. Tracking and Clock Calib
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(sample-to-sample) range data as in
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NOTE: The definition of 240. MHz is
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time" refers to that portion (leadi
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e. TDRSS Delay Compensation. The WS
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Section 10. SN Operations for TDRSS
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Table 10-2. Overview of SN Message
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10.2.2.6 Schedule Distribution List
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Table 10-3. Schedule Request Descri
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Revision 10 10-9 450-SNUG Applicabl
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10.2.3.4 Forecast Scheduling Genera
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which have been committed to the SN
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10.2.4.2 Specific Schedule Request
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e. Each SSC represents a single ser
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NOTE: TUT reports are not transmitt
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Scheduling Data (SHO) Operations Me
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10.2.7.2 NISN Event Schedule (NES)
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System Element Table 10-7. Real-tim
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System Element Table 10-9. Real-tim
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System Element Table 10-10. Real-ti
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System Element Table 10-10. Real-ti
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Revision 10 10-33 450-SNUG Message
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10.4 Customer Platform Emergency Op
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operations. During a customer platf
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Appendix A. Example Link Calculatio
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A.3.2 Forward service link calculat
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User Spacecraft G/T (dB/K) 20 10 0
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. Required Eb /No is 9.9 dB (BER of
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Ideal Required Prec (dBWi) -150 -16
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Appendix B. Functional Configuratio
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Customer MOC SN Data Interface WDIS
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Page 391 and 392: Appendix C. Operational Aspects of
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Page 405 and 406: C.4 Reacquisition C.4.1 Introductio
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Page 413 and 414: Appendix D. Spectrum Considerations
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Page 433 and 434: potential interference to other sys
Page 435 and 436: Annex to Appendix D D.A.1 Special C
Page 437 and 438: Table D.A-1. Peak Power Calculation
Page 439 and 440: Appendix E. Customer Platform and T
Page 441 and 442: 1. Jitter = None (Coded or Uncoded
Page 443 and 444: Figure E-8. QPSK Phase Imbalance id
Page 445 and 446: R max R ideal Figure E-11. Residual
Page 447 and 448: For forward service: O/ OUT AM / PM
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Page 451 and 452: E.21 PN Chip Rate PN code chip rate
Page 453 and 454: Appendix F. Periodic Convolutional
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Page 457 and 458: Appendix G. Predicted Performance D
Page 459 and 460: G.3.3 If the RFI environment become
Page 461 and 462: G.6 SSA and MA Forward Service RFI
Page 463 and 464: Appendix H. Demand Access System (D
Page 465 and 466: H.1.4 DAS Service Modes There are t
Page 467 and 468: DAS provides service through each s
Page 469 and 470: modulation format. Acquisition by D
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Receiving service request responses
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Revision 10 H-13 450-SNUG Customer
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H.3.2 Communications Interface H.3.
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Upon determining that the request i
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Appendix I. NASA Integrated Service
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Figure I-1. NISN/SN Legacy Interfac
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I.2.2 Non-IP Routed Data Services P
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Network Control Header Customer Hea
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NOTE: A block with bit 82 set to bi
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Appendix J. Customer Constraints fo
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J.3 Acquisition For S-band DG2 nonc
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Appendix K. Use of Reed-Solomon Cod
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NOTE: Throughout this document, the
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Appendix L. McMurdo TDRSS Relay Sys
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Appendix M. Deleted This page inten
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N.3 Test Services Description Test
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TDRSS component may require the who
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N.6.2 Test Scheduling The use of al
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model also determined duty cycles f
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P.1 Major System Components P.1.1 C
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P.2 External Interfaces P.2.1 Netwo
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The user will be able to print eith
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SNAS MOC user will be able to speci
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The SNAS will allow a minimum durat
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the DAS Resource Allocation Request
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gateway and a proxy for the Closed
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Figure Q-1. WDISC Overview Q.2.1 IP
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database management, testing, troub
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In general, to obtain SN services,
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scheduling of SN Gateway services a
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Figure R-1. SN Gateway Overview Rev
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Figure R-3. WSC SN Gateway Interfac
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Table R-1. Comparison of Between WD
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Table S-1. TDRSS Forward Service Si
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Service Modulation Coding (2) Data
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Service Data Group DG2 (5) Phase Mo
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Service Data Group Mode Modulation
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Command Data Telemetry Data Ground
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And Data Handling (C&DH), referred
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Table U-1. TDRSS MAR Service Recomm
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Table U-2. TDRSS SSAR Service Recom
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BSR bit slippage rate BW bandwidth
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EET End-to-End Test EIF Engineering
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IRAC Interdepartmental Radio Adviso
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NASCOM NASA Communications Network
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R R range acceleration between a T
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SND Space Network Directive SNG SN
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T s receiving system noise temperat
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