1. Ground Station Design and Requirements for Scientific Data Acquisition of DSP Satellites July 5, 2002 Ma Zhongsong CSSAR

2. Contents Overview Ground Stations Interface Requirements to VILSPA2
Equipments Delivery
Test Instruments Required
Site requirement

3. Overview
Background
Technical Visit to ESOC & Villafranca Station (June 11, 2001)
Minutes of Meeting

4. DSP Satellites’ Orbits
Equator
Polar
Inclination
28.5 °
90 °
Perigee
550 Km
700 Km
Apogee Km
39000 Km
Period
20.9hrs
11.7hrs

5. Scientific Data Channel Specifications
RF Frequency
2287.5MHz
Power
7~9W
Modulation
DQPSK
BER
≤1×10-5
Data Rates
＜5000km
5000～15000km
15000～45000km
1024Kbps
128Kbps
16Kbps

6. Ground Stations CSSAR Ground Station(Beijing)
European Ground Stasion(VILSPA2, Spain)
Shanghai Astronomical Observatory (Upgrade Required)

7. CSSAR Ground Station(Beijing)
Location: 40°27′37″N,116 °51 ′06 ″E, 99m
Antenna: 11.28m
Frequency Range: 2200~2300MHz
Polarization: LHCP/RHCP/Combined
Gain: 45.6dBi
G/T: °
Pedestal: AZ/EL/Train(Overhead Pass Support)
Max. Velocity: EL10°/S ，AZ22°/S
Max. Acceleration: EL10°/S2 ，AZ10°/S2
Tracking Accuracy: 0.02 °rms

10. CSSAR Ground Station Block Diagram

11. CSSAR Ground Station Upgrades
Variable Bit Synchronizer
Additional IF Filters in Receivers for Three Bit Rates
Real-time Automatic Controller of Data Channel Equipments
Multiplexer &Deplexer for Microwave relay channel

12. European Ground Stasion(VILSPA2, Spain)
Location: 40°26.42' N,3 °57.07' W, m
Antenna: 15m
Frequency Range: 2200~2300MHz, 8000~8500MHz
Polarization: LHCP/RHCP
G/T: 28dB/K(S-Band), 36dB/K(X-Band)
Pedestal: AZ/EL
Max. Velocity: 15°/S

15. VILSPA2 Block Diagram

16. Shanghai Astronomical Observatory
Location: 311°05′57″N,121 °11 ′59 ″E, 5m
Antenna: 25m Cassegrain
Pedestal: AZ/EL(Railway)
Max. Velocity: EL0.28°/S ，AZ0.55°/S
Pointing Accuracy: 20 ″ rms

18. Shanghai Astronomical Observatory Upgrades
S-Band Feed (Tracking Channel)
Servo System (Auto Tracking)
Data Channel Equipments Supported by CSSAR
S-Band Receiver
QPSK Demodulater
Data Recorder
Test Equipments

19. Interface Requirements to VILSPA2

20. Equipments Interface to VILSPA2
70MHz
Switch
PCM
Switch IF
70MHz IF
70MHz
Data/
Clock
L-Band Down
Converter
IFMS
CDS
TMP IF
70MHz
Data/
Clock
Terminal Test Device IF
70MHz
Data Distribution Unit RF
2287.5MHz
Data/
Clock
Simulator
BER Tester
PC Data Recorder
Data/
Clock
Demodulater
PC Data Recorder
VILSPA2 Instruments
CSSAR Instruments

21. Interface Specifications
Base Band (Data/Clock)
Code: NRZ-L
Level: TTL
Bit Rate: 1024/128/16Kbps
Impedance: 50Ω
Connector: BNC
Clock Phase: 180°

22. Interface Specifications (Continued)
Intermediate Frequency (IF)
Frequency: 70MHz
Level: 0±1.5dBm
Impedance: 50Ω
Connector: N type

23. Data Distribution Unit
Equipments Delivery
Items
Quantity 1
Data Distribution Unit 2
Data Recorder 3
RF Simulator 4
Demodulator 5
Terminal Test Device

24. Test Instruments Required
Digital Transmission Analyzer/BER Tester (16K~1.024Mbps Binary Code Support)
Spectrum Analyzer (0.1M~3GHz)
Oscilloscope (100MHz)
Function Generator(0~10MHz)

25. Site Requirement One 19 Inch Rack for Five 2U Chassis
Desk for Two Recorders(PCs)
Power Supply(AC220V50Hz/500W)
UTC Source (TBC)

26. THANK YOU!