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Table 5-2. TDRSS MA Forward Service Parameter Description Field of view (each TDRS) PFOV +13 degrees conical Customer Ephemeris Uncertainty (note 3) < + 9 sec < + 9 sec TDRS antenna polarization Left-hand Circular (LHC) TDRS antenna axial ratio (maximum) 1.5 dB over 3-dB formed beamwidth LEOFOV +10.5 degrees conical TDRS signal EIRP (minimum) PFOV LEOFOV SMAF via TDRS F8-F10 and K, L, M (note 2) +40 dBW +42 dBW MAF via TDRS F3-F7 +34 dBW +34 dBW Transmit frequency (nominal) (refer to note 1) RF bandwidth (3 dB minimum) 6 MHz Duty factor 100 percent 2287.5 0.1MHz Notes: 1. The customer MOC must include the best estimate of the customer platform receiver center frequency at the start time of each scheduled service support period in its service specification code (refer to Section 10, paragraph 10.2.2). The TDRSS MA forward service carrier frequency is then implemented by the SN ground terminal to the accuracy of the SN ground terminal frequency standard except during Doppler compensation. 2. F8 is unavailable for normal customer scheduling. 3. User ephemeris uncertainty allowance is based upon the assumption of a low eccentricity LEO user orbit. User orbits with high eccentricity and large variations in velocity may need to comply with a more stringent user ephemeris uncertainty. Revision 10 5-8 450-SNUG 221 240
Table 5-3. Salient Characteristics for TDRSS MA Forward Services Parameter (Note 1) Description (Note 1) Command channel radiated power Range channel radiated power only) (SS-UQPSK +10 + 0.5 dB Modulator phase imbalance (peak) +3 degrees (for each BPSK channel) Modulator gain imbalance (peak) +0.25 dB Relative phase between command and range channels (SS-UQPSK only) 90 +3 degrees Data asymmetry (peak) (Note 2) +3 percent Phase nonlinearity (peak) (Note 3) +0.12 radian over +2.1 MHz Gain flatness (peak) (Note 3) +1.2 dB over +2.1 MHz Gain slope (peak) (Note 3) +0.1 dB/MHz over +2.1 MHz AM/PM
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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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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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Revision 10 6-25 450-SNUG Table 6-8
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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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Table 8-3. Salient Characteristics
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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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Revision 10 B-5 450-SNUG SN Ground
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Revision 10 B-7 450-SNUG SN Ground
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The SN return services are divided
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Revision 10 B-11 450-SNUG From chan
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Revision 10 B-13 450-SNUG From sing
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Revision 10 B-15 450-SNUG NRZ Only
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Revision 10 B-17 450-SNUG Table B-3
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The signal is transmitted using unb
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Appendix C. Operational Aspects of
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service PN codes (command and range
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Revision 10 C-5 450-SNUG Table C-1.
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Revision 10 C-11 450-SNUG Table C-3
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Revision 10 C-13 450-SNUG Table C-3
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C.4 Reacquisition C.4.1 Introductio
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Table C-4. Parameters Which Impact
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Customer MOC/NCCDS changes operatin
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. Initial acquisition not achieved
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Appendix D. Spectrum Considerations
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For most Space Network users, the a
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PFD (α) = maximum power flux densi
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Equation D-5: sin 4 ( x) P T , / 2
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For signals with two channels, the
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PFD (dBW/m^2/4kHz) -142 -144 -146 -
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Figure D-4. NTIA Out-of-Band (OOB)
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Table D-5. Spectrum Points of Filte
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criteria for deep space operations
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PSD (dBW/Hz) -170 -180 -190 -200 -2
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potential interference to other sys
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Annex to Appendix D D.A.1 Special C
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Table D.A-1. Peak Power Calculation
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Appendix E. Customer Platform and T
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1. Jitter = None (Coded or Uncoded
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Figure E-8. QPSK Phase Imbalance id
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R max R ideal Figure E-11. Residual
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For forward service: O/ OUT AM / PM
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E.16 Out-of-Band Emissions Out-of-b
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E.21 PN Chip Rate PN code chip rate
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Appendix F. Periodic Convolutional
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Revision 10 F-3 450-SNUG ENCODER SY
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Appendix G. Predicted Performance D
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G.3.3 If the RFI environment become
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G.6 SSA and MA Forward Service RFI
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Appendix H. Demand Access System (D
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H.1.4 DAS Service Modes There are t
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DAS provides service through each s
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modulation format. Acquisition by D
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H.1.5.3 Transmission Delays The ove
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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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