Attachment Graphs on the Visibi

This document pretains to SAT-LOA-19941116-00088 for Application to Launch and Operate on a Satellite Space Stations filing.

IBFS_SATLOA1994111600088_973521

\ gilsovgsy ig:44 @soi 420 0932 NOAA/NESDIS/OSD ~~— FCC—SEB Goo1/023 UNITED STATES DEFARTMENT OF COMMERCE National Oceanic and Atmaspheric Administration NATIONAL ENVIRONMENTAL SATELLITE, DATA, AND INFORMATION $ERVICE Wishington, D.C. 20233 FAX TRANSMITTAL SHEET =— >* DATE: 30 January 98 24— Set ~4y~ 26 Satf~ 7yC 4954C FROM: David F. McGinnis TO:; Alex Roytblat (<]/—ia t 4 5 7 —y4{ ~ 4g5 Office of Systems Development FCC TELEPHONE NO: 301 457 §5125 TELEPHONE NO: FAX NO: 301 420 0932 FAX NO: 202 418 0765 Number of Pages Sent (Including This Cover Sheet) : 23 Comments: Alex, Attached is the summary and charts of the analysis performed by CSC regarding the FAT "old vs. "hybrid" systems. Please let me know if you (or Harry) have any questions. Regards, ave P.S. I tried to send an e—mail message, but it was returned. I sent it to araytblat@fco.gov. Have all the FCC e~—mail addresses changed, since Harry‘s message was also returned?

’ ‘o;;'ao/sss 18 :44 30L 420 0932 NOaAaA/NESDIS/OSD _»~— FCC—SEB Gooz2/023 T0O: Frank Eng FROM: Bill Daniels INFO TO: Dave McGinnis SUBJECT: Graphs on the Visibility of Final Analysis Satellites INTRODUCTION Final Analysis has proposed to share with NOAA weather data downliuks by shutting off their transmitters when their coverage area overlaps that of NOAA. They havi: proposed recently to change their constellation by incressing the number of sateilites and reducirg the inclination of all but two of them. The accompanying graphs display data generated by the SFCG programn and show the occurrence of coverage overiap of the NOAA and Final Analysis satellite coverage. They are intended as a means to evaluate the impact of the proposed changes in the Final Analysis constellation. A hybrid constellation was also simulated to observe the impact: of changing the inclination only. DATA ANALYZED The constellations are simulated to deterniine their overlapping coverage. The received interference power was not considered, therefore only orbital parameters are relevant. The table below shows the input orbital parameters of the three systems analyzed. Input Values for the Computer Analysis Item Old Constellation New Constellation Hyorid Constellation Number of Satellites 26 32 26 . Orbital Altitude (km) 1000 1000 1000 Number of Planes 4 2 6 2 4 2 Satellites per Plane 6 1 5 1 6 1 Inclination (degrees) 66 83 51 83 51 83 Right Ascension 0,45,90, 0,90 0,60,120, 0,90 0,43,90, 0,90 (degrees) 135 180,240, 135 300 Mean Anomaly 0,60,120, 0 0,72,144. 0 0,60,120, 0 (degrees) 180,240, 216,288 18G,240, 300 30G

\en/3o/98 ig:44 @soi 420 0932 NOAA/NESDIS/OSD ++ FCC—SEB Goos/023 The hybrid constellation has the same number of satellites as the old constellation but the inclination is changed from 66 degrees to 51 degrees. FIGURES The results are presented in two sets of figures with ten figures per set. One set shows the comparison of the new and old Final Analysis constellations. The second set shows the comparison of the old constellation with a "Hybrid" constellation. The graphs within each set differ by latitude from 0 degrees (the equator) to 90 degrees (the pole.) 'I,'he lanmdeis the location of an earth station. The figures represent the percent of time that zero, one or more Final Analysis satellites are visible to the earth station provided that the NOAA satellite is also visible. The simulation output provides the fraction of time that potentially interfering satellites are visible to the earth station when the desired satellite is visible plus the percentage of time that the—desired satellite is visible. The plotted values are normalized by dividing the Final Analysis satcihtc visibility by the NOAA satellite visibility. ‘ Each graph shows the number of simultaneous visible satellites on the X—axis and the normalized visibility percentage on the Y—axis. The values for each satellite should add to100. The graphs collectively provide a visual means to observe the shift of distribution of overlapping satellites for changes in the Final Analysis constellation. Observetions of the shift within a graph and between graphs both provide information on the effect of constellation changes.

aal Analysis Times Overlapping NOAA Satellite _.ge/og/to Comparison of Old & New Constellations for Final Analysis at 0 deg North sFi8T OO L Percent of Time FAI Satellites Visible Zg80o Oolf 1T0¢8§ [NOAA satellite available for 3.9% of the time O\ & p T dIS—304——« dS0/SIGISAN/YYON & b C | Number of Visible Satellites .' Old constellation New constellation] £20/400 P mMYFIH ES\NOAAUSS EES\FNL ANAL.wb3 01/29/98 10:41:05 AM

0 r1al Analysis Times Overlapping NOAA Satellite gs/zog/to Comparison of Old & New Constellations for Final Analysis at 10 deg North gFP‘8T O ~] Percent of Time FAI Satellites Visible ZP80 o¥ Tor$§ [NOAA satellite available for 3.98% of the time O\ & & Un GS0/S1GSAN/YYON 4495—>04 «+ Number of Visible Satellites - Old constellation % New constellation rZ0o/ 200 P 01/29/98 10:40:07 AM

‘inal Analysis Times Overlapping NOAA Satellite 38/0C410 _ Comparison of Old & New Constellations for Final Analysis at 20 deg North SP:8T O O Percent of Time FAI Satellites Visible OA A satellite available for 4.2% of the time IgBs0 OoIF TorS§ Un O «J O J > dso/s1ds4N/yYON & h C pw—k gI§—994++ & Number of Visible Satellites l- Old constellation New constellation ceo/900 P w__ e 22 \MYFILES\NOAAUSS_EES\FNL_ANAL.wb3 01/29/98 10:41:47 AM

Final Analysis Times Overlapping NOAA Satellite #8/0CfT0 _ Comparison of Old & New Constellations for Final Analysis at 30 deg North 9F‘8T & n Percent of Time FAI Satellites Visible NOAAA satellite available for 4.65% of the time _ TC60 OoZF 10¢§ dSso/SIdsIn/vyvoN @4S—D04 «+ Number of Visible Satellites . O1d constellation New constellation £eo/100 NE ANAL whi 01/29/88 10:42:46 AM

Final Analysis Times Overlapping NOAA Satellite s6/00/I0 _ Comparison of Old & New Constellations for Final Analysis at 40 deg North 9F °8T & n Percent of Time FAI Satellites Visible If6B0 OZlF Tor§ NOA A satellite available for 5.38% of the time J O «J I ; J C | $ ds0/s1dS3N/YYON & h | [aas! pusvuek l d4S—DD04 +« se ,_() ..Wiu. 1 “12 . M”3 5ol l 3 ,AS.,A El 2y Number of Visible Satellites _ ____ . Old constellation New constellation ber _ £20/800 P en mAravEIl ECWAIWYAAGC CF S\FNI ANA L.wh3 01/29/98 10:43:48 AM

Final An alysis Times Overlapping NOAA Satellite essz/oc/to _ Comparison of Old & New Constellations for Final Analysis at 50 deg North gri8t ‘Percent of Time FAI Satellites Visible Zf6O OZF TotS OAA satellite available for 6.8% of the USO/SIUSIN/¥YYON I1S—D0d e« Number of Vlslble Satellites '. O1ld constellation % New constellation £eo/ 800 P 01/29/98 10:44:42 AM

Final Analysis Times Overlapping NOAA Satellite @#6/00/t0 _ Comparison of Old & New Constellations for Final Analysis at 60 deg North LPi8T Percent of Time FA1I Satellites Visible I880 OoItF Tog§ dso/SsIds1N/YYON @1S—D3D04 «+ Number of V isible Satellites l - Old constellation New constellation ceo/010 P mAravEii EClaimaAUMSS CES\ENIL ANAL wha 01/29/988 10:45:51 AM

Final Analysis Times Overlapping NOAA Satellite > 88/0¢C/To Comparison of Old & New Constellations for Final Analysis at 70 deg North LPi8T Percent of Time FAlI Satellites Visible O Un [NOAA satellite available for 11.9% of the time IC60 OZF Tor§ daso/sIds IN/vyvYyON d1§5—001 ec+ Number of V isible Satellites . Old constellation % New constellation £20/110 P C:AMYFILES\NOAANUSS EES\FNLANAL.wb3 01/30/98 01:56:10 PM

Final Analysis Times Overlapping NOAA Satellite 8g8 /o0¢/to . Comparison of Old & New Constellations for Final Analysis at 80 deg North A Percent of Time FAI Satellites Visible ~[] C | If80 OZF Torg®§ NOA A satellite available for 13.1% of the time 1 O\ O pulcl Nam" fom»! i oo & wfa J dso/sIdsINn/yyON & J | & t# ' C Je | 41S—994 +« C Number of Visible Satellites . Old constellation New constellation £20/210 mAamivEi ECRNIMAAUSG EFSIENI ANAL Wwb3 01/30/98 01:56:41 PM

Final Analysis Times Overlapping NOAA Satellite s8/08/T0_ Comparison of Old & New Constellations 8F:8T for Final Analysis at 90 deg North Percent of Time FAI Satellites Visible oo & If60 OoZFH Toft§ | NOAAA satellite available for 15.0% of the time O\ au»] «J C dso/s1IdsIN/YYON & wl d4S—004c« — & Number of Visible Satellites ‘ . Old constellation New consteilation ~~cro/cto® mAAivCil COlANIMAAUSS EERSIENI ANAL wha 01/30/98 01:57:34 PM

Final Analysis Times Overiapping NOAA Sateliite §e/og/to _ Comparison of Constellations 8t 8T for Final Analysis at 0 deg North OO _ Percent of Time FAlI Satellites Visible <£B0 OZF TorS§ NOAAA satellite available for 3.9% of the time C Co —]s dSO/SIUGSIN/YYON & b @1S—D0D04 e _ w Number of Visible Satellites !. O1ld constellation Hybrid constellation cco/tF10 P massvon momrvaaice ECESIENI ANAl wh3 01/29/98 04:52:38 PM

Final Analysis Times Overlapping NOAA Satellite §8/0¢/1T0° Comparison of Constellations 8¢‘8T for Final Analysis at 10 deg North C —~] Percent of Time FAI Satellites Visible Ef6O0 OZF TOfS NOAAA satellite available for 3.9% of the time O\ O & Un dso/s1dsaN/vy¥YON 10 — 4IS—994 e p 1 5 s 1 ,4_ oo / 5 —| 6 & l _ Number of Visible Satellites . Old constellation _ % Hybrid constellation fceo/sto murain A kiAE ..4.% 1 toafran 04:52:08 PM

inal Analysis Times Overlapping NOAA Satelilite esvsoc/to Comparison of Constellations Bri8t for Final Analysis at 20 deg North T60 OZF TOfE NOA A satellite available for 4.2% of the time dso/sIdsIN/YYON 20 — 10 —p 11S—D504 ++« Number of Visible Satellites . Old constellation % Hybrid constellation sgzo/gto P A1l2?afaar 0451 :35 PM

Final Analysis Times Overlapping NOAA Satelilite s6/0¢/Te Comparison of Constellations 6F:8T for Final Analysis at 30 deg North €€60 OZF TOfS§ Percent of Time FA) Satellites Visible O i ; NOAA satellite available for 4.2% of the time T —} T & eJ | dso/sIdsIN/YYON & bo \ | prrsck & | IS—D04 «e Number of Visible Satellites . O1ld constellation Hybrid constellation cco/.t0 & 01/29/98 04:51:02 PM

"inal Analysis Times Overlapping NOAA Satellite 8s8/0¢/ro Comparison of Constellations for Final Analysis at 40 deg North B6F°RT Percent of Time FAI Satellites Visible 2G8B0 OZF ToCS NOAAA satellite available for 5.38% of the time dso/sIdsIn/y¥yoOoNn 15 — 10 + n | I1S—304 «er o 4 & Number of Visible Satellites [R 014 constetiation Hybrid constellation £20/810 CAMYEFII ESNOAAUSS EES\FNL ANAL wb3 01/29/98 04:49:00 PM

Final Analysis Times Overtapping NOAA Satellite $6/0¢ /16 Comparison of Constellations OS :§T for Final Analysis at 50 deg North Percent of Time FAI Satellites Visible ZCBO OZF 1T0¢§ NOAA satellite available _ |for 6.8% 6. % of the time USO/SIUGSIN/YYON @IS$—D304 «+ 3 Number of Visible Satellites ’ . O1ld constellation % Hybrid constellation l £20/610W ANAL w63 01/29/98 04:48:04 PM

Final Analysis Times Overlapping NOAA Satellite Coxnpz;rison of Constellations C1/30/988 for Final Analysis at 60 deg North 18:50 & NOAAA satellite available for 3.9% of the time w F301 420 09832 C 10 |— W NOAA/NESDIS/OSD M\ alqIstA sail[fores y4 aurt], Jo jua3194 & s FCC—SEB Number of Visible Satellites l [R 014 consteltation _Hybrid constetlation @o20/023 CAMYFIIESNOAAUSS EES\FNL ANAL wb3 01/29/98 04:47:27 PM

_ nal Analysis Times Overlapping NOAA Satellite se/oc/fte Compérison of Constellations for Final Analysis at 70 deg North ogist Percent of Time FAI Satellites Visible J Un OAAA satellite available for 11.9% of the time tso Oo%r TOG® To) & 1 | J Un hJ O peroak i dso/sIdsIN/vyYON O pourei n 1IS—Dd04 e« & Number of Visible Sateliites ] . Old constellation Hybrid constellation fro/tz0 P mmvaavCi| FOUNIMAAUCGCQ CEAENI ANAl wh3 61/30/98 02:05:54 PM

"inal Analysis Times Overlapping NOAA Satellite _ sge/og/to Comparison of Constellations IS©81 for Final Analysis at 80 deg North Percent of Time FA1I Satellites Visible If80 OlItF Tort§ [T\IOAA satellite available for 13.1% of the time GSO/SIGSIN/YYON J O hJ O 10 7 gus—901+« 2 3 4 4 D\ Number of Visible Satellites 1 . Old constellation Hybrid constellation cco/zzo M \MYFILES\INOAAUSS_EESWFNL_ANAL.wb3 01130788 02:10:36 PM

> C "inal Analysis Times Overlapping NOAA Satellite se/0¢/tg Comparison of Constellations IS°8T 1J for Final Analysis at 90 deg North ‘B 100 — It80o Ooit Toc§ NOA A satellite available for 14.4% of the time 9 > OO C M 2 o & 60 ) <L g1s—>04 ++ dSO/SIGSIN/YYON l «h C BJ .E E— 20 ~|— WR tpa O B D) O Jt 1O C L Un Number of Visible Satellites [. Old constellation Hybrid constellation cro/cio C:\MYFILES\NOAAUSS EES\FNL _ ANAL.wb3 01/30/88 02:13:15 PM

s Oiz1?298 X0M ugy:is FaX 202 soi 8189 NTIA/OSM/ SP&P coa C 00 1 57L / Z7 ) cg_;\r-\?“ct #. %m & 0 ’E 2y~ Se—f~ p Jua ~ 41 aIs 998 — ;flT\ A?’)’?C./\/b“} 3'- &~ W‘M wl s 20. : nmnia* flq' y §¥ J ~ \\ cb f“d/‘s 4) — 9 F . > > uy TL F PM (. $2, ‘MC;A’.D‘G( OfMfice of Spectru Management a T j'ifi"f“f‘);u\(;‘-,\01~f}7 MEMORANDUM December 29, 1997 TO: Harry Ng FROM: Jim Vorhieg"| A‘ SUBJECT: Review of Little Leo Amended Applications ‘ Review of the three amended applications to date point out the following: E—Sat ord calculation method (i.e. average over 130 KHz) needs to be checked Ref. E—sat amended application Reply Comments of E—Sat Systems December 12, 1997 Final Analysis Out—of—band emission in the 400 MHz band. The effect of raising the cartier power on adjacent sand operations needs to be anslyzed. Final Anaisis Reply Comments, December 15, 1997 Change % +i in number and inclination of satellites means more interference potential. See Attachment Ref. FAl Amended Application Petition to Deny of LEO One, page 10 Lco One Appears to meet the requirements in the Report and Order

tu & > A~/ 4o oX usycils FAX 202 501 8189 NTIA/OSM/ SP&P l2.7]00;3 AITACHMENT To: D. McGinnis —rom: F. Eng Subject: Comments on FALI Amended Filing CSC_ has reviewed Final Analysis Inc.‘s (FAI‘s) latest amended E llin dated October 30, 1997. We have some concern that the sproposed changes szqn*flcantly increase the probability of APT/LRPT interference in the more important, lower latitudes (e.g. below O 5 ) . We recognize that under the present time sharing agreement, O FAI is obligated to cease transmissions to avoid this lnterference, nowever we also recognize that this cessation of transmissions is dependent on the successful operation of a string of events including: 1) the transmission of appropriate commands to the FAT spacecraft, 2) the receipt and processing of the command, and 3) the successful execution of the command. In general, this string of events must be successfully completed for each "overlap" of NOAA and FAI satellite footprints. The number of overlaps is significantly increased at the lower latitudes by this latest FAI amendment, thereby increasing the probability of interference. If all FAI systems operated perfectly as planned there would be no grounds for concern, however, in the real world there is always a ite chance of faulty operations. The ovaerall risk of Cb om D p4 OO poeor t a rt 1J & terference is therefore expected to increase with this expansion pot ential interfering events (i.e., satellite footprint overlaps Lower latitudes). o 2. McGinnis 15 December 1997 +4 0 tj h H M 0 3 ectc: Additional Comments on FAI Amended Filing L2 4. t tn 5 Decenber concerns about the increased J‘Q e~ U i4 t M q. Dogt b— 210M 2o bposg ~) M W t—oct O 0 +< (t ® 6 J i { r3 m in 0 (D ; 1 ® ;; M , U 3 o O Lal s1 q from FAI‘s amended filing g H opp No oc 13 y A (D e o 6 LVJ M + rers OwWill always be some finite uo 9 c M Hort re ctort Bopmor 0 ty 2 (1 : Forf ° m a tcime sharing system, we strongly M ..J.i‘ P4+ P M i « p1o 13 M ore fLop— 0 Hoth HoGC M J or m Nort 0 ‘1 O >« M 0 HoGQ re es 1ort uy oD ce (Dort _(% M U i4, ‘U pt p— rf (wio) red to establish and operate a }...J t n oo M ® fu t t;nuously 1monitsor the EIRP of each (n . h h ocri— D 0 ’J C1 o} fy U ctrum. NOAAA should require that this p+— MoUl t r— t\ «1 hho J 4 identify any EIRP malfunction (1.e., f. eb] J a },0 p»—4 fetsat polar spacecraft) within two rf Pooud .9* r3 }.J 3 t % 5 ccurrence. NOAAA should further require that $y p—— U c ease —ransmissions from the nmalfunctioning +* 3 (D +

ifu.L’*/kL.‘/ 40 luM usil/ rakl 202 301 4139 NTIA/OSM/ SP&P 9 Ee > 003 satellite within two hours of its initial identification.


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Document Modified: 2012-10-24 15:19:08
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