Attachment Revised attachment B

This document pretains to SAT-MOD-20040728-00151 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2004072800151_391023

Attachment B Summary Information Related to DigitalGlobe NGSO Remote Sensing Satellite System DigitalGlobe, Inc. 1

Appendix 1, Mission Data Downlink Analysis 400 MHz DATA RATE DOWNLINK ANALYSIS Fo = 8.185 GHz DOWNLINK PARAMETERS: Frequency 8.185 GHz Orbit height in km 450 km Local elevation above hor. 5 degrees Data rate 400 Mbps Bandwidth (baseband) 200 MHz Spacecraft ant. EIRP at max scan 59.4 dBm Slant range 1944.46 km Ground ant. G/T 29.4 dB/K BER 1.00E-06 Required Eb/No (without coding) 10.8 dB Hardware imp. BER loss -2.5 dB LINK CALCULATION: TOTAL POWER TO GROUND: Satellite EIRP 59.4 dBm Path loss -176.5 dB Total loss (rain, polarization, etc.) -7.5 dB RECEIVER SENSITIVITY: Required Eb/No 10.8 dB Available Eb/No 14.9 dB DOWNLINK MARGIN 4.1 dB ANTENNA SIZES: Spacecraft Antenna Segment Spacecraft dish diameter 16 inches Approx. HPBW 6.4 degrees Gain of spacecraft antenna 28.0 dBic Loss between HPA out and ant. input -7.6 dB Transmitter Po 8.0 watts EIRP of satellite system 59.4 dBm Ground Antenna Segment Ground antenna G/T 29.4 dB/K System noise temperature 147.9 K (referenced at aperture) Directivity gain ground antenna 51.1 dBic Ground dish diameter 5.4 meters Approx. HPBW 0.5 degrees DigitalGlobe, Inc. 2

Appendix 2, Power Flux Density; Wideband Downlink DigitalGlobe, Inc. 3

Appendix 3, S-Band Command Uplink Link Analysis COMMAND UPLINK OMNI ANTENNA NOMINAL EarthWatch FREQUENCY 2.0856875 GHz UPLINK 45.0 dBW EIRP WAVELENGTH 0.14 METERS ALTITUDE 450.0 KM 5 DEG SLANT RANGE 1944.5 KM COMMAND DATA ON TONES DATA RATE KBPS CMD MOD INDEX 1.0 MARGIN dB CARRIER 8.4 CMD 3.4 ANTENNA: OMNI NOMINAL +/- 75 DEG PARAMETER UNIT VALUE UPLINK EIRP dBW 45.0 FREE SPACE DISPERSION LOSS dB -164.6 POINTING LOSS dB -0.5 ATMOSPHERIC LOSS 42 mm/hr dB -0.4 S/C ANTENNA GAIN < +/- 75 DEG dBi -16.0 POLARIZATION LOSS dB -3.0 S/C LINE LOSS dB -1.1 TOTAL S/C RECEIVED POWER dBm -110.6 CARRIER PERFORMANCE NET RECEIVED POWER dBm -110.6 MIN CARRIER ACQUIS POWER dBm -119.0 MARGIN CARRIER ACQUISITION dB 8.4 COMMAND CHANNEL PERFORMANCE (MI=1.0) NET RECEIVED POWER dBm -110.6 MINIMUMCMD CHANNEL POWER dBm -114.0 COMMAND DESIGN MARGIN dB 3.4 DigitalGlobe, Inc. 4

Appendix 4, Narrowband Downlink Link Analysis TELEMETRY DOWNLINK R/T, PBK /NADIR FREQUENCY 8.38 GHz WAVELENGTH 0.04 METERS POWER 5.0 WATTS 5 DEG SLANT RANGE 1944.5 KM ALTITUDE 450.0 KM REAL TIME DATA UQPSK I CHANNEL DATA RATE 16.384 KBPS PLAYBACK DATA UQPSK Q CHANNEL DATA RATE 524.288 KBPS MARGIN R/T 23.1 dB PBK 14.0 dB ANTENNA: NADIR PARAMETER UNITS VALUE TOTAL TRANSMIT POWER dBm 37.0 PASSIVE LOSS dB -7.0 S/C ANTENNA GAIN >+/-90 DEG dBic 0.0 FREE SPACE DISPERSION LOSS dB -176.7 ATMOSPHERIC LOSS dB -1.0 GROUND STATION G/T dB/K 29.4 TOTAL RECEIVED POWER/T dBm/K -118.3 BOLTZMANN CONSTANT dBm/Hz-K -198.6 TOTAL RECEIVED POWER/KT dB-Hz 80.3 DATA CHANNEL I (real time) DATA/TOTAL POWER dB -7.0 DATA POWER/KT dB-Hz 73.3 INFORMATION RATE 16 KBPS dB-Hz 42.1 AVAILABLE S/N dB 31.2 REQUIRED Eb/No 1.00E-6 BER dB 13.3 CODING GAIN dB 5.2 AVAILABLE SIGNAL MARGIN dB 23.1 DATA CHANNEL Q (playback) DATA/TOTAL POWER dB -1.0 DATA POWER/KT dB-Hz 79.3 INFORMATION RATE 512 KBPS dB-Hz 57.2 AVAILABLE S/N dB 22.1 REQUIRED Eb/No 1.00E-6 BER dB 13.3 CODING GAIN dB 5.2 AVAILABLE SIGNAL MARGIN dB 14.0 DigitalGlobe, Inc. 5

WV Narrowband PFD Performance as a function of Ground Elevation Angle with WV Patch Antenna —138 —140 i ———O———O———O———O———O———O———¥———¥———&———¥——4——s 442 144 / PFD, dBW/m*2—4kHz —146 / /././ 148 // —152 —154 1 1 m 1 1 m 1 m —156 ground elevation, deg —+— PFD spec —®—WV NB 450 km

Filtered WideBand PSD vs Out of Band Spec 7800 7900 8000 8100 8200 8300 8400 8500 freq, MHz ——— Output PSD, dB/Hz ®® DSN filter spec, dB == NTIA spec, dBsd

Filter Performance Filter Description Manufacturer: Aeroflex p/n FA4825 400 MSPS Transmit Filter Technology is a 10 pole cross-coupled cavity combline filter utilizing all aluminum construction. Input connector is SMA female. Output is WR112 waveguide Filter shape (amplitude vs. frequency) is raised cosine with x/sinx peaking (Shape is optimized for best bit error rate performance) Attenuation in stopband (deep-space) is 8400 MHz >45 dB increasing to >55 dB at 8450 MHz DigitalGlobe, Inc. 8


Document Created: 2004-07-08 07:29:01
Document Modified: 2004-07-08 07:29:01
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC