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Table 6-9. TDRSS SSA Return Service Parameter (Note 7) Description (Note 7) Field of View (FOV) (each TDRS) (note 9) Customer Ephemeris Uncertainty (along the customer orbital track) (note 10) Primary +22 degrees east-west +28 degrees north-south < + 9 sec < + 7.8 sec TDRS antenna polarization (note 4) RHC or LHC selectable TDRS antenna axial ratio (maximum) 1.5 dB over 3 dB beamwidth Receive frequency band (see paragraph 6.3.3.5.b) RF bandwidth (3dB, minimum) 10 MHz 10 -5 Bit Error Rate (notes 1, 2, 3, 8): 2200 MHz to 2300 MHz Extended Elliptical (F8-F10 and K, L, M) 24.0 degrees inboard east-west 76.8 degrees outboard east-west +30.5 degrees north-south Orbital Dynamics Powered and non-powered flight dynamics (defined in Table 6-10) Minimum Required P rec for Rate 1/2 convolutional coding: All P rec values are in dBW DG1 modes 1 and 2 -231.6 + 10log 10 (data rate in bps) DG1 mode 3 DG2 I channel -231.6 + 10log 10 (data rate in bps) Q channel Data rate < 1 Mbps -232.1 + 10log 10 (data rate in bps) Data rate > 1 Mbps -231.2 + 10log 10 (data rate in bps) Data rate < 1 Mbps -232.1 + 10log 10 (data rate in bps) Data rate > 1 Mbps -231.2 + 10log 10 (data rate in bps) Minimum Required P rec for Rate 1/3 convolutional coding: DG1 mode 3, Q channel All P rec values are in dBW Data rate < 1 Mbps -232.4 + 10log 10 (data rate in bps) Data rate > 1 Mbps -231.6 + 10log 10 (data rate in bps) Revision 10 6-28 450-SNUG
Table 6-9. TDRSS SSA Return Service (cont’d) Parameter (Note 7) Description (Note 7) 10 -5 Bit Error Rate (notes 1, 2, 3, 8) (cont’d): Minimum Required P rec for Rate 1/3 convolutional coding (cont’d): DG2 Acquisition (notes 3, 8): Data rate < 1 Mbps -232.4 + 10log 10 (data rate in bps) Data rate > 1 Mbps -231.6 + 10log 10 (data rate in bps) Orbital dynamics Free-flight dynamics only (defined in Table 6-10) Total Channel Acquisition Time (assumes the customer return service signal is present at the SN ground terminal at the start time of the return service support period) PN Code (if applicable) and Carrier Acquisition: Sum of the following: 1. PN (DG1 only) and carrier acquisition time 2. Symbol/Decoder synchronization time or Symbol/Deinterleaver/Decoder synchronization time (if deinterleaving is applicable) Prec > -202.9 dBW or consistent with the Prec for BER, whichever is greater Acquisition Time (Pacq > 90%): Coherent operations < 1 sec Noncoherent operations with frequency uncertainty (note 5): < + 700 Hz < 1 sec < + 3 kHz < 3 sec < + 35 kHz < 3 sec Channel Decoder/Symbol Synchronization Acquisition (note 6): Minimum data bit transition density > 64 randomly distributed data bit transitions within any sequence of 512 data bits Number of consecutive data bits without a transition < 64 Prec (dBW) consistent with the Prec for BER Revision 10 6-29 450-SNUG
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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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Page 91 and 92: platform transmit frequency for non
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Page 117 and 118: 6.2.2 PSK Signal Parameters The TDR
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Page 131 and 132: d. The customer platform receiving
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Page 135 and 136: Table 6-7. TDRSS SSA Return Service
Page 137 and 138: 6.3.2.2 DG1 Signal Parameters DG1 s
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Page 141: and signal characteristics specifie
Page 145 and 146: Table 6-9. TDRSS SSA Return Service
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Page 153 and 154: 2. DG1 Mode 1 (or 3) to DG1 Mode 2
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Page 163 and 164: Table 6-14. TDRS SSAR IF Service Sp
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Page 167 and 168: c. Frequency Sweep on the Forward L
Page 169 and 170: Table 7-1. TDRSS KuSA Forward Servi
Page 173 and 174: 7.2.5 Acquisition Scenarios The fol
Page 177 and 178: Table 7-4. KuSA Forward Service Rea
Page 179 and 180: Table 7-5. TDRSS KuSA Return Servic
Page 181 and 182: . SQPSK Modulation. SQPSK modulatio
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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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Table 7-9. TDRSS KuSA Return Servic
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Table 7-9. TDRSS KuSA Return Servic
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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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This page intentionally left blank.
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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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