SN User's Guide - ESC Home - NASA

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User Spacecraft G/T (dB/K) 20 10 0 -10 -20 -30 KaSA Forward Service EIRP (Autotrack) 63.0 dBW EIRP (LEO Program Track) 59.5 dBW EIRP (Program Track) 56.2 dBW Data/Total Power Loss -0.4 dB (UQPSK assumed for data rates < 300 kbps) BER 10 -5 FOR EXAMPLE ONLY Customer Performance Margin 3.0 dB Program Space Loss -212.9 dB Track Polarization Loss -0.5 dB Pointing Loss 0 dB Other Losses () -2.5 dB LEO Program Track Required Eb/No 9.9 dB 300 kbps -40 1000 10000 100000 1000000 10000000 100000000 Achievable Data Rate (bps) Autotrack Max Data Rate 25 Mbps Note: Data/Total Power Loss assumes UQPSK for data rates ≤ 300 kbps Figure A-7. KaSA Forward ADR versus G/T (F8-F10) Revision 10 A-10 450-<strong>SN</strong>UG
. Required Eb /No is 9.9 dB (BER of 10 -5 ). The SSA and KuSA forward services are provided both with normal mode and high mode EIRP. Customer platform/TDRSS incompatibility and RFI degradation (see paragraph A.3.3 below) is 0 dB. A.3.3 CLASS is used to determine if any incompatibility or RFI degradation exists between the customer platform's receiving system terminal and the TDRSS. Detailed characteristics of the customer platform receiving system and the salient characteristics of the TDRSS forward services determine the magnitude of any compatibility loss. When applicable, these degradation factors, as determined by CLASS, must be included as loss terms on the right side of Equation A-1. A.4 Return Service Link Calculations A.4.1 Return service performance is expressed in terms of having sufficient received power (Prec) at the TDRS to achieve a specific data rate (referred to as ADR) for a return service data channel BER of 10 -5 . The received power (Prec) at the TDRS is defined as the "Unity" Power Received at the Input to TDRS (i.e., with a TDRS gain of 0 dBi). Customers do not need to understand the details of the TDRS, TDRS-to-ground terminal link, and the ground terminal specifics for link margin performance. Return service performance is determined by calculating the predicted required Prec at a TDRS (accounting for all system losses), and comparing it to the ideal required Prec at the TDRS for a given data rate. A.4.2 The ideal required Prec is determined as follows: Equation A-4 Ideal required Prec = 10 log10 Rd + K where: K is a constant depending on the service, type of tracking and/or field of view, coding, data rate, and mode. These relationships are as shown in Tables 5-8 (MA), 6-9 (SSA), 7-7 (KuSA), and 8-7 (KaSA). A.4.3 The predicted required P rec is determined by the following equation: Revision 10 A-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 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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