Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3436

b) the cycling of 25 pages of subframes 4 and 5 shall restart with page 1 of each of the subframes, regardless of which page was transmitted prior to the end/start of week. All upload and page cutovers shall occur on frame boundaries (i.e. Modulo 30 seconds relative to the end/start of week). Note New data in subframes and may start to be transmitted with any of the pages of these subframes 3.1.1.2.3 Data parity Words 1 through 10 of subframes 1 through 5 shall each contain 6 parity bits as their least significant bits (LSBs). In addition, two non-information bearing bits shall be provided as bits 23 and 24 of words 2 and 10 for parity computation purposes. 3.1.1.2.4 Telemetry (T M) word. Each TLM word shall be 30 bits long, occur every 6 seconds in the data frame and be the first word in each subframe. The TLM format shall be as shown in Figure B-3. Each TLM word shall begin with a preamble, followed by 16 reserved bits and 6 parity bits. 3.1.1.2.5 andover word ( ) The HOW shall be 30 bits long and shall be the second word in each subframe/page, immediately following the TLM word. A HOW shall occur every 6 seconds in the data frame. The HOW format and content shall be as shown in Figure B-4. The full time-of-week (TOW) count shall consist of the 19 LSBs of the 29-bit -count (3.1.1.2.6). The HOW shall begin with the 17 MSBs of the TOW count. These 17 bits shall correspond to the TOW count at the 1.5-second epoch that occurs at the start (leading edge) of the next following subframe. 3.1.1.2.5.1 it . On satellites designed by configuration code 001, bit 18 shall be an “alert” flag. When this flag is raised (bit 18 is a “1”), it shall indicate to the user that the satellite user range accuracy (URA) may be worse than indicated in subframe 1 and that use of the satellite is at the user s risk. *All figures are located at the end of the appendix. 23/11/06 A 2007/70/II. szám A endix Annex 10 — Aeronautical Communications able Code p ase assignments Satellite ID number GPS PRN signal G2 delay (chips) First 10 chips octal* *** *** 34** *** *** *** 37** * In the octal notation for the first 10 chips of the C/A code as shown in this column, the first digit represents a “1” for the first chip and the last three digits are the conventional octal representation of the remaining 9 chips (e.g. the first 10 chips of the C/A code for pseudo-random noise (PRN) signal assembly 1 are: 1100100000). ** C/A codes 34 and 37 are common. *** PRN signal assemblies 33 through 37 are reserved for other uses (e.g. ground transmitters). A 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 3.1.1.2.5.2 it Bit 19 shall be reserved. 3.1.1.2.5.3 its and . Bits 20, 21 and 22 of the HOW shall provide the identification (ID) of the subframe in which that particular HOW is the second word. The ID code shall be as defined below: ID Code 3.1.1.2.6 Satellite count Each satellite shall internally derive a 1.5-second epoch that shall contain a convenient unit for precisely counting and communicating time. Time stated in this manner shall be referred to as a -count. The -count shall be provided to the user as a 29-bit binary number consisting of two parts as follows. 3.1.1.2.6.1 Time of wee (T ) count The binary number represented by the 19 LSBs of the -count shall be referred to as the TOW count and is defined as being equal to the number of 1.5-second epochs that have occurred since the transition from the previous week. The count shall be short-cycled such that the range of the TOW count is from 0 to 403 199 1.5-second epochs (equalling one week) and shall be reset to zero at the end of each week. The TOW count s zero state shall be the 1.5-second epoch that is coincident with the start of the present week. A truncated version of the TOW count, consisting of its 17 MSBs, shall be contained in the HOW of the L1 downlink data stream. The relationship between the actual TOW count and its truncated HOW version shall be as indicated in Figure B-5. Note The above mentioned epoch occurs at (approximately) midnight Saturday night Sunday morning where midnight is defined as hours on the UTC scale which is nominally referenced to the reenwich Meridian 3.1.1.2.6.2 ee count. The 10 MSBs of the -count shall be a binary representation of the sequential number assigned to the present GPS week (Modulo 1024). The range of this count shall be from 0 to 1 023. Its zero state shall be that week which starts with the 1.5-second epoch occurring at (approximately) the UTC zero time point (3.1.4). At the expiration of GPS week number 1 023, the GPS week number shall roll over to zero. The previous 1 024 weeks in conversions from GPS time to a calendar date shall be accounted for by the user. 3.1.1.3 DATA C NTENT 3.1.1.3.1 Subframe satellite cloc and health data. The content of words 3 through 10 of subframe 1 shall contain the clock parameters and other data as indicated in Table B-2. The parameters in a data set shall be valid during the interval of time in which they are transmitted and shall remain valid for an additional period of time after transmission of the next data set has started. 3.1.1.3.1.1 ee number The 10 MSBs of word 3 shall contain the 10 MSBs of the 29-bit -count and shall represent the number of the current GPS week at the start of the data set transmission interval with all zeros indicating week “zero.” The GPS week number shall increment at each end/start of week epoch. 3.1.1.3.1.2 User range accuracy (URA) Bits 13 through 16 of word 3 shall provide the predicted satellite URA as shown in Table B-3. Note The URA does not include error estimates due to inaccuracies of the single fre uency ionospheric delay model Note The URA is a statistical indicator of the contribution of the apparent cloc and ephemeris prediction accuracies to the ranging accuracies obtainable with a specific satellite based on historical data 23/11/06 A 2007/70/II. szám A endix Annex 10 — Aeronautical Communications able Subframe 1 parameters Parameter Number of bits** Scale factor (LSB) Effective range*** Units Week number weeks Satellite accuracy Satellite health discretes TGD 8* 2 31 seconds IODC toc 604 784 seconds af2 8* 2 55 seconds/second2 af1 16* 2 43 seconds/second af0 22* 2 31 seconds * Parameters so indicated are two s complement, with the sign bit ( or ) occupying the MSB. ** See Figure B-6 for complete bit allocation. *** Unless otherwise indicated in this column, effective range is the maximum range. able ser range accuracy URA Accuracy 2 m 2.8 m 4 m 5.7 m 8 m 11.3 m 16 m 32 m 64 m 128 m 256 m 512 m 1 024 m 2 048 m 4 096 m Do not use 3.1.1.3.1.3 ealth The transmitting satellite 6-bit health indication shall be provided by bits 17 through 22 of word 3. The MSB shall indicate a summary of the health of the navigation data, where:

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