Attachment Schedule S GXT

This document pretains to SAT-LOA-20060412-00043 for Application to Launch and Operate on a Satellite Space Stations filing.

IBFS_SATLOA2006041200043_494832

Beam Diagram and Service Area for Transmit and Receive Spot Beams The 54 spot beams will cover the U.S. without gaps. Each spot beam will have a peak gain of 49.4 dB and will provide service within the -4 dB contour. The uplink and downlink spot beams will be identical in size and co-axial. The contours for these beams will be as follows: Contour level (dB from peak) Beamwidth (in degrees) -2 0.48 -3 0.60 -4 0.70 -6 0.84 -8 0.94 -10 1.10 -15 1.34 -20 1.54 The name of each beam and its pointing direction are given by the following table: Transmit Receive Boresight Boresight Beam Beam Lat. Long. S01T S01R 39.7326 -73.4350 S02T S02R 39.3818 -79.3538 S03T S03R 44.4408 -73.2442 S04T S04R 39.1149 -84.7581 S05T S05R 34.9471 -83.7996 S06T S06R 44.0125 -79.7035 S07T S07R 43.6959 -85.5403 S08T S08R 35.1780 -78.6846 S09T S09R 43.4649 -90.9781 S10T S10R 34.7693 -88.5996 S11T S11R 38.9138 -89.8183 S12T S12R 30.7078 -95.9889 S13T S13R 27.4269 -81.5284 S14T S14R 38.7684 -94.6451 S15T S15R 45.0306 -65.7457 S16T S16R 31.0762 -82.7158 S17T S17R 34.5881 -119.205 S18T S18R 30.7968 -91.7365 S19T S19R 34.5426 -97.6093 S20T S20R 30.9181 -87.3330

S21T S21R 34.6364 -93.1796 S22T S22R 38.8428 -122.418 S23T S23R 48.5269 -119.877 S24T S24R 23.9452 -80.2460 S25T S25R 27.0337 -98.4368 S26T S26R 43.3045 -96.1570 S27T S27R 48.7613 -125.764 S28T S28R 30.6085 -108.296 S29T S29R 48.6133 -92.0421 S30T S30R 43.3871 -121.131 S31T S31R 34.5111 -114.815 S32T S32R 30.6749 -116.499 S33T S33R 30.6284 -112.374 S34T S34R 30.6475 -100.140 S35T S35R 38.6714 -99.3190 S36T S36R 38.6192 -103.903 S37T S37R 34.4689 -110.5040 S38T S38R 48.3834 -14.2470 S39T S39R 30.6149 -104.2300 S40T S40R 48.4336 -97.7496 S41T S41R 43.1820 -111.0390 S42T S42R 34.4601 -106.2270 S43T S43R 34.4844 -101.9430 S44T S44R 48.8897 -86.0240 S45T S45R 43.2547 -116.0200 S46T S46R 49.2850 -79.4966 S47T S47R 38.6424 -113.0190 S48T S48R 43.1663 -106.1140 S49T S49R 38.6094 -108.4530 S50T S50R 48.3382 -103.2830 S51T S51R 43.2064 -101.1760 S52T S52R 38.7189 -117.6540 S53T S53R 48.3221 -108.7490 S54T S54R 43.5870 -126.4620 Note that the spot beam pattern is described succinctly and efficiently by the spot beam pointing directions in latitude and longitude and spot beam roll-off in space coordinates because each beam, in space coordinates, is a circle and its contours are almost identical. If the spot beam pattern were described in ground coordinates, suitable for a “GXT.” file, each spot beam would be different and the spot beam coverage, generally, is not circular but must be described point by point. Each spot beam is further defined as seven contours, i.e., the -2, -4, -6, -8, -10, -15 & -20 dB contours.

Consequently, there would be 7 x 54 = 378 “GXT.” files. With an assumed 20 points per contour, then 20 x 378 = 7,560 points would have to be identified. Pegasus respectfully submits that its concise description of the spot beam pattern is precise and adequate for the Commissions’ purposes


Document Created: 2006-03-10 09:43:24
Document Modified: 2006-03-10 09:43:24
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