IS-GPS-800D (797938), страница 12
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Integrity properties of the URA arespecified with respect to the scaled (multiplied by either 4.42 or 5.73 as appropriate) upperbound value of the URA index or to the scaled composite of the upper bound values of allcomponent URA indexes.Note #1: URA applies over the curve fit interval that is applicable to the NAV data from whichthe URA is read, for the worst-case location within the satellite footprint.Note #2: The URA for a particular signal may be represented by a single index in the NAV dataor by a composite of more than one index representing components of the total URA.
SpecificURA indexes and formulae for calculating the total URA for each signal are defined in appendix20 for the LNAV message and appendix 30 for the CNAV message.Note #3: The above integrity assured probability values do not apply if: (a) an alert is issued tothe users before the instantaneous URE exceeds either of the scaled URA bounds, or (b) an alertis issued to the users no more than 5.2 seconds after the instantaneous URE exceeds the 4.42times URA bound, and (c) if the integrity status flag is 'on' and an alert is issued to the users nomore than 5.2 seconds after the instantaneous URE exceeds the 5.73 times URA bound.
In thiscontext, an "alert" is defined as any indication or characteristic of the conveying signal, asspecified elsewhere in this document, which signifies to users that the conveying signal may beinvalid or should not be used, such as the health bits not indicating operational-healthy,broadcasting non-standard code, parity error, etc.6.2.1.1 User Differential Range AccuracyUser Differential Range Accuracy (UDRA) is a statistical indicator of the GPS ranging accuracyobtainable with a specific signal and SV after the application of the associated differentialcorrections (DC parameters). UDRA provides a conservative RMS estimate of the differentialuser range errors in the navigation data for that satellite. It includes all errors for which theSpace and Control Segments are responsible.75IS-GPS-800D24 Sep 20136.2.2 GPS Week NumberThe GPS week numbering system is established with week number zero (0) being defined as thatweek which started with the X1 epoch occurring at midnight UTC(USNO) on the night ofJanuary 5, 1980/ morning of January 6, 1980.
The GPS week number continuously incrementsby one (1) at each end/start of week epoch without ever resetting to zero. Users must recognizethat the week number information contained in the navigation message may not necessarilyreflect the current full GPS week number (see paragraph 3.5.3.1).6.2.3 Legendre SequenceThe Legendre sequence L(t) of length 10223, defined in Section 3.2.2.1.1, is given in Table 6.21.6.2.4 LDPC SubmatricesThis section defines the coordinates of elements with value “1” in each of the submatricesspecified in Section 3.2.3.4. Tables 6.2-2, 6.2-3, 6.2-4, 6.2-5, 6.2-6, and 6.2-7 define thecoordinates of elements with value “1” in each of the submatrices A, B, C, D, E, and T,respectively, for Subframe 2.
Tables 6.2-8, 6.2-9, 6.2-10, 6.2-11, 6.2-12, and 6.2-13 define thecoordinates of elements with value “1” in each of the submatrices A, B, C, D, E, and T,respectively, for Subframe 3.Due to large amount of information provided in some of the submatrix tables, supplementalinformation is provided in Tables 6.2-14, 6.2-15, 6.2-16, and 6.2-17. The supplementalinformation tables provide the number of 1’s in each row and column of submatrices A and T forsubframes 2 and 3.76IS-GPS-800D24 Sep 2013Table 6.2-1.
Legendre Sequence (Octal)173625224716677443761771453225431227357067446011111676325702457304327166103060663165015360236326461605713021557517261023306623114310646326661362564064436766635324172144136334557200726502636356116015325570506036007055464414360774632266366266360133705612651312644611315155202121716265261523453340531472211323376333260110746350572431141430063760247314303140402617637577533743216215652657577110247315026671772406774776421200607460021445667057136720666112627147110766657456314474452331137623266203232211734360124544754706043130642163162366114357761521377412150775045452640414002034574212557024140577450405731332250767241214252232176043412311102527344131707746744036166532451140577564607741074534741742353436101041024277326143227725171622125477371036737726501707311672004335057534167154356366664554127505523447272654565162752741752404050304720203607531262010502033320762716366414125005323642253774244635633622143212310060653677744700527030732413124377743135465702312142567220524315022320076216132265415642576636465142153071135021711741370760274064073642661624734451503106535047431322707301772337646352533210534326336051442634060352627122163614576154021025171566327232733023063155340225335032257652747510306330172225736567731262417237372150365757524074124530650543121215452456412744551110304344670742405242357723066216016512002303660203452733000652013434712201353675656703424134074146541674077150400774665520510703754114016262754212536666367435700723325341275210105322262457565402574753604527340743737745575125455640164127400272470004346710330030735162635716124154552170342067323237331233002062325545546305425110166614613120711172102605611655473771417177273500140117520061113646275366600205125041307234062400403207137572636346215370031563474663520564354166771022300232267321422574225632471257306072777244646067155120265127016022770511310317323140150347551645617703716560452247706704303132512177244542302754720756243110103551750730271110315166306633116633671206404473606057071112303370247650671171636110612350205536012301066467715417604213223453225060070035401106113253020773002733624554412012635277031372007627165366373435417141106127631146544236721776616246247406731341247770664050175214170467345313624325657241060666330267273454207415233721726333012775401565472563220052244116253053560235754006046002330372707552132361473166523762624730076527024171745013674603346741710606760335767435653624375465456564102355013331423513673526361745427274364771157740342102404425741033403037511524620443366512454412044666024241521126525043117021046471156255307610146373013540564256322755042323535663170316515400334727562143134363507570252411344031655764502213167617472656003120750207453655073604677505203505462671650342727410161546365756051204026013021526462331512477627713737265704450314472767412114365061531456435256401117021645625417362172637745121407610627332550045023754267525360412430342614730412542377444506360651042432535644134305350554427620714767012245304641515673206635652512672415353711555727543526510215573152666403635423674053557536734374002660150341213454270312421026433422227644336750505451440313025043010042372117166014114237741027654060753612501762553130030510621410322724616120366337715757744043770425623306755305773230721450473440127622312072223247417345421231362311771675207052353066254211360747246765751100015274462117413315307140072103754514665012716674607443420310254613017700263601043127727544553022137620NOTE:The above sequence is read from left to right across a row and then moves down to the next row.Since 10224 bits are listed above, a single initial bit value of 0 should be ignored.
Thus the first 23 values in theabove sequence represented by octal 17362522 are the bit values, 0 1 1 1 1 0 1 1 1 1 0 0 1 0 1 0 1 0 1 0 0 1 0.77IS-GPS-800D24 Sep 2013Table 6.2-2. LDPC Submatrix A for Subframe 2 * (sheet 1 of 11)R115144013119755210537846183404501672275843334315631725042713731037311627952242184369218426491893064381692955934834150970142353126291453,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C111222333444555666777888999101010111111121212131313141414151515161616R9624562615438017842052940235397592854112733765982593265281202034341942133991147955793110575241379537592222189255540104518565133256409,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C171717181818191919202020212121222222232323242424252525262626272727282828292929303030313131323232R2122829936338749646762198735039319944258626632956823146553215233639445801253575605731134064681651873582328231441287569144462503180320582,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C333333343434353535363636373737383838393939404040414141424242434343444444454545464646474747484848R43244954920624859021247352513242445915734547035297564139175495137220273315401225238362328447588136293476427654438141342192452539407437507,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C494949505050515151525252535353545454555555565656575757585858595959606060616161626262636363646464R263366402123172441101389555237280429108413585271335410789753063372526182653827515816723445795482505551503018626151929318497114182243492,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C656565666666676767686868696969707070717171727272737373747475757576767677777778787879797980808081R53455920651052018621534825237448318529849924630746439254418561174812684214543374895241272834863188416817457852294316822535486927555315,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C818182828283838384848485858586868687878788888889898990909091919192929293939394949495959596969697R112196102233405109148312661552472883865431010754710312835519039058712938359761242351171216506981935915464220340367536124326030146448200,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C9797989898999999100100100101101101102102102103103103104104104105105105106106106107107107108108108109109109110110110111111111112112112113*Coordinates of elements with value “1” in submatrix A (599 rows, 600 columns).
The coordinates arerepresented as R, C where R=row and C=column.78IS-GPS-800D24 Sep 2013Table 6.2-2 LDPC Submatrix A for Subframe 2 * (sheet 2 of 11)R24047620963388415649327837041419533251416438144417022355071302321743085664942255426752357458903604304394662394354885343358015931135425,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C113113114114114115115115116116116117117117118118118119119119120120120121121121122122122123123123124124124125125125126126126127127127128128128129R371212905045621612305411351793593003275133642559518348558917722137847166450942574942740847927429244312424539816027053532439648091130368122,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C129129130130130131131131132132132133133133134134134135135135136136136137137137138138138139139139140140140141141141142142142143143143144144144145R277356349445531251344400249502527147296556226343458162438822430939532106428651452814364555173456758328576599168375533209500516210018114,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C145145146146146147147147148148148149149149150150150151151151152152152153153153154154154155155155156156156157157157158158158159159159160160160161R27251141246959239146357944134471286521551196045112074606833440379188303118536546314057122417561213774682582803478419832413841959757,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C161161162162162163163163164164164165165165166166166167167167168168168169169169170170170171171171172172172173173173174174174175175175176176176177R815966020432551153414262264303217284365126371423236321339274490570851633192113614677503843133315083014744752293173521151372016205364102,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C177177178178178179179179180180180181181181182182182183183183184184184185185185186186186187187187188188188189189189190190190191191191192192192193R1913302143205581762355871111434779599538782102261732503354322526387514919627830577905121102033853347485323421542223269444162184392119,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C193193194194194195195195196196196197197197198198198199199199200200200201201201202202202203203203204204204205205205206206206207207207208208208209R1972985910555912450755220128350186122227157242563932294271161614592003695494695155811242644530632655532843559325850957070256516151291547246,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,C209209210210210211211211212212212213213213214214214215215215216216216217217217218218218219219219220220220221221221222222222223223223224224224225*Coordinates of elements with value “1” in submatrix A (599 rows, 600 columns).
![](https://s.studizba.com/z.php?f=/templates/si/i/noavatar.png&w=100&h=100&t=1"){kind=avatar}
