Exhibit 3 Link Budget

0864-EX-CN-2017 Text Documents

BlackSky Global, LLC

2017-11-13ELS_201075

BlackSky Global LLC Exhibit 3 FCC Form 442 Link budgets The table below shows the link budgets for transmissions from Global-1. The UHF downlink utilizes a whip antenna on the satellite. It is intended to be an omnidirectional system, and the average antenna gain value over the entire spacecraft body frame is used as the antenna gain in this budget (whereas the peak gain is reported elsewhere in the application). The UHF ground system utilizes a yagi antenna. The X-band downlink uses a patch antenna on the spacecraft and a parabolic antenna on the ground. The link budget for both downlinks include an estimate of line-loss on the satellite, whereas the peak signal reported elsewhere in the application does not include line loss (line loss has not yet been measured, and thus including no line loss is conservative from a peak-gain standpoint). This link budget assumes 550 km mean orbit altitude and a 5 degree elevation above the horizon. Note that Global-1 was designed to operate in orbits up to 600 km altitude, hence the high margins. UHF X-band Parameter downlink downlink Unit Circular Altitude 550 550 km Elevation from Ground Station 5 5 deg Resulting slant range 2,205.9 2,205.9 km Center Frequency 401.5 8125 MHz Spacecraft Transmitter Power 3.0 6.0 dBW Spacecraft Antenna Gain -5 15 dBi Expected Line Loss 0.9 2.0 dB Spacecraft EIRP -2.9 19.0 dBW Isotropic Signal received at Ground Station -156.9 -161.2 dBW Ground Station Antenna Gain 13 45.9 dBi Ground Station Antenna Expected Losses 1.1 1.2 dB Ground Station G/T -12.7 22.7 dB/K Effective data rate (post-FEC) 9.6 kbps 93.7 Mbps Resulting Eb/No 19.2 10.2 dB Specified bit error rate 1.0E-06 1.0E-12 - Required Eb/No 5.8 5 dB Resulting Link Margin 13.4 5.2 dB


Document Created: 2017-11-13 15:38:48
Document Modified: 2017-11-13 15:38:48
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