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The procurement of TDRS-K, L, M spacecraft was initiated in August 2006 by letter from the Deputy Associate Administrator, Space Communications and Navigation Office, Office of Space Operations, to NASA GSFC. The TDRS K, L, M spacecraft (third generation TDRS) are to be the functional, performance, and operational equivalent of TDRS HIJ (F8-F10) for Single Access Services (S, Ku and Ka-bands) and better than first generation (TDRS 1-TDRS 7) for ground based beam-formed MA Return Services. The third generation TDRS MA Return antenna element specifications and MA ensemble return channel specifications are such that the MA Return formed beam G/T should be degraded by no more than 1 dB from second generation TDRS (TDRS HIJ) performance allowing for fewer return elements and ground beam-forming. The dual frequency TT&C for collocation of spacecraft is also retained. The SN ground terminal upgrades for the TDRS K, L, M spacecraft include installation of Ka-band End-to-End Test (EET) terminals, new MA return service ground-based beamformers and retention of a compatible digital element interface to the DAS. TDRS-K is scheduled to be launched in 2012, TDRS L is scheduled to be launched in 2013, and TDRS M is scheduled to be launched in 2016. Ground terminal upgrades are to be completed prior to TDRS K, L, M launch. NOTE: The SNUG reflects performance characteristics that may differ from those specified in TDRS Spacecraft and Ground Terminal Specifications. As TDRS K, L, M on-orbit performance data becomes available, the SNUG will be updated, if necessary, to reflect performance across the entire fleet. 2.3.1 Space Segment The space segment of the SN consists of up to six operational TDRSs in geosynchronous orbit at allocated longitudes for relaying forward and return service signals to and from customers for data transfer and tracking. Additional spare TDRSs may be in geosynchronous orbit. All active first generation TDRSs (F3-F7) carry functionally identical payloads, all second generation TDRSs (F8-F10) carry functionally identical payloads, and all third generation TDRS (K, L, M) carry functionally identical payloads. Figure 2-3 and Figure 2-4 identify the pertinent communications components and associated parameters of the first generation (F1-F7) and second generation (F8-F10) TDRSs, respectively. Revision 10 2-4 450-SNUG
Multiple Access Antenna • 30 elements: 12 diplexed for transmit/30 for receive • S-band communications: - 2.1064 GHz (Forward) - 2.2875 GHz (Return) • Circular polarization (LHC only) • +13 +13 conical Field-of-View Single Access Antenna Space-to-Ground Link Antenna • 2.0 m Ku-band antenna: - 14.6-15.25 GHz (Uplink) - 13.4-14.05 GHz (Downlink) • WSC/GRGT-TDRS uplink/downlink • Orthogonal, linear polarization Omni Antenna • S-band TT&C • LHC polarization Single Access Antenna • Dual-frequency communications: - S-band: 2.025-2.120 GHz (Forward) 2.200-2.300 GHz (Return) - Ku-band: 13.775 GHz (Forward) 15.0034 GHz (Return) • Circular polarization (LHC or RHC) • +22 +22 E-W, +28 +28 N-S rectangular Field-of-View Figure 2-3. First Generation Tracking and Data Relay Satellite (F3-F7) Revision 10 2-5 450-SNUG
Page 1 and 2: 452 / Space Network Project 450-SNU
Page 3 and 4: Space Network Users’ Guide (SNUG)
Page 5 and 6: Preface The Space Network Users’
Page 7 and 8: Change Information Page List of Eff
Page 9 and 10: Table of Contents Section 1. Introd
Page 11 and 12: 6.2.5 Real-Time Configuration Chang
Page 13 and 14: Appendix B. Functional Configuratio
Page 15 and 16: Appendix J. Customer Constraints fo
Page 17 and 18: Figure 10-5. NCCDS/NEST Scheduling
Page 19 and 20: Figure B-6. Customer Platform Funct
Page 21 and 22: NASA Standard Transponder .........
Page 23 and 24: Table B-3. Data Configuration Const
Page 25 and 26: 1.1 Purpose and Scope Section 1. In
Page 27 and 28: Section/ Appendix Table 1-1. Docume
Page 29 and 30: S SN Future Services Describes futu
Page 31 and 32: Many of the links require access to
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Page 35 and 36: Section 2. SN Overview 2.1 General
Page 37: Revision 10 2-3 450-SNUG Customer P
Page 41 and 42: Table 2-1. Example of TDRS Constell
Page 43 and 44: services. The detailed TDRS spacecr
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Page 47 and 48: quality. For further information on
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Page 53 and 54: Table 3-2 provides an overview of t
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Page 57 and 58: Data Group and Mode (note 4) Table
Page 59 and 60: platforms to have SA support on one
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Page 69 and 70: the Space Network's ability to supp
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Revision 10 5-17 450-SNUG Table 5-7
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platform transmit frequency for non
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configurations, the I-Q channel amb
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Table 5-8. TDRSS MA Return Service
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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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Table 6-4. Salient Characteristics
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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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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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Table B-5. Data Configuration Const
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Table B-7. Data Configuration Const
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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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