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Revision 10 3-10 450-SNUG 19m Second TDRSS Ground Terminal 19m 19m 4.5m 4.5m 4.5m SGLT-1 SGLT-2 SGLT-1 and SGLT-2each provide: • Same services as SGLT-3, plus • 2 KaSA, FWD & RTN (notes 3 and 5) • 1 MA FWD, 5 MA RTN (note 6) White Sands Complex SGLT-3 SGLT-3: • 2 SSA, FWD & RTN (note 5) • 2 KuSA, FWD & RTN (notes 3 and 5) • Customer Tracking •End-to-End Testing SGL Antennas S/Ku-Band (note 1) EET Antennas S/Ku-Band (note 2) IFL White Sands Ground Terminal 18.3m 18.3m 4.5m 4.5m SGLT-4 SGLT-5 SGLT-4 and SGLT-5each provide: • Same services as SGLT-3, plus • 2 KaSA, FWD & RTN (notes 3 and 5) • 1 MA FWD, 5 MA RTN (note 6) 4.5m SGLT-6 (note 4): • 2 SSA, FWD & RTN (note 5) • 2 KuSA, FWD & RTN (note 5) • 1 MA FWD, 2 MA RTN (note 6) • Customer Tracking •End-to-End Testing Figure 3-1. Telecommunications Services for each SGLT Guam Remote Ground Terminal Notes: 1. The WSGT SGL antennas support Ku-band operations only. 2. The TDRS K, L, M WSC upgrades will implement two Ka-band End-to-End (EET) terminals. The TDRS K, L, M WSC upgrades are expected to be completed by 2012. 3. Each TDRS F8-F10 and K, L, M supports either KuSA or KaSA services through each SA at a time. 4. There is no requirement to support TDRS F8-F10 or K, L, M through GRGT SGLT-6. The 5.0m EET antenna is provided for redundancy. 5. The SN can simultaneously support S-band and K-band (either Ku or Ka for F8-F10 and K, L, M) forward and/or return services through one SA antenna to the same ephemeris. 6. The SN DAS allows expansion of the TDRSS F3-F7 and K, L, M MAR DG1 mode 2 services well beyond the standard number of return services per TDRS/SGLT. 7. There is no requirement to support TDRS F3-F7 through GRGT SGLT-7. GRGT SGLT-7 is not available for SN Customer services (dedicated set of Customers only). 8. The 16.5m SGL antenna is provided for redundancy for both GRGT SGLT-6 and GRGT SGLT-7. GDIS Guam Remote Station 5.0m 11m 16.5m (note 8) 16.5m SGLT-7 (note 7): • 2 SSA, FWD & RTN (note 5) • 2 KuSA, FWD & RTN (note 5) •1 SMA FWD, 5 SMA RTN SGL Antennas S/Ku-Band EET Antenna S/Ku-Band
platforms to have SA support on one of a TDRS's SA antennas while leaving the other SA antenna available for other users. Use of this approach is encouraged whenever feasible. For the virtual customer platform concept to be viable, the differences between the vectors for the two real platforms should be small. Either the customer MOC or the FDF must provide the NCCDS with improved interrange vectors (IIRVs) for the virtual platforms. The IIRVs for the virtual platforms can be copies of the IIRVs for either of the two real platforms. Considering the differences in antenna beamwidth between S-band and Ku- or Ka-band, it is recommended that the IIRVs be provided based upon the Kuor Ka-band real platform. Two virtual customer platforms can be defined for a pair of real platforms. One of the virtual customer platforms is defined to have the S-band characteristics of the first real platform and the K-band characteristics of the second real platform. The other virtual customer platform complements the first, and is defined to have the K-band characteristics of the first real platform and the S-band characteristics of the second real platform. 3.2.3 Cross-Support Service Overview Any customer platform that is compatible with MA service can use forward or return support from either the TDRSS MA or the TDRSS SSA services. When the forward and return services are supplied by different TDRSS telecommunications services (e.g., MA forward and SSA return), the configuration is called a cross-support service. 3.3 Tracking and Clock Calibration Services The SN provides tracking and clock calibration measurements for MA, SSA, and KuSA customers, as well as SSA/MA cross-support customers. Note that the SN does not provide these services for KaSA customers. Table 3-3 describes the tracking and clock calibration services available for each return link data group and mode. a. Range. Range measurements may be provided when the customer is configured to transmit a PN code on the return link with the epoch synchronized to the epoch of the PN code received on the forward link range channel. b. Doppler. Two-way Doppler measurements may be provided when the customer is configured such that the return link carrier is coherently related to the received forward link carrier. One-way return Doppler measurements may be provided when the return link carrier is not coherently related to a forward link carrier. c. Customer Time Transfer. The time transfer function requires that the customer transponder coherently turns around the PN code epoch received in the forward service range channel. The time transfer function provides a method to acquire the data necessary to update a customer platform clock. It gives the customer MOC the ability to determine the time difference between the on-board platform clock and Universal Time Coordinated (UTC). To facilitate the time transfer measurement, the customer must cause the platform to note and store the Revision 10 3-11 450-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’
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
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Page 83 and 84: e. The customer platform receiving
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Table 5-11. TDRSS MA Return Service
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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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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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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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