WWVB Atomic Clock GU(I[Y]) Part 3

14 0 data[40] 24 0 data[31] 34 0 data[22] 44 0 data[13] 54 0 data[4]
15 hour_8 data[39] 25 day_80 data[30] 35 0 data[21] 45 year_80
data[12] 55 LYI data[3] 16 hour_4 data[38] 26 day_40 data[29] 36
UT1_S[2] data[20] 46 year_40 data[11] 56 LSW data[2] 17 hour_2
data[37] 27 day_20 data[28] 37 UT1_S[1] data[19] 47 year_20 data[10]
57 DST[1] data[1] 18 hour_1 data[36] 28 day_10 data[27] 38 UT1_S[0]
data[18] 48 year_10 data[9] 58 DST[0] data[0] 19 Marker time[0] 29
Marker R 39 Marker R 49 Marker notice 59 Marker 0
Second 40 41 42 43 Legacy AM/PWM UT1_C_0.8 UT1_C_0.4 UT1_C_0.2
UT1_C_0.1 Phase data[17] data[16] data[15] data[14] Second Legacy
AM/PWM Phase 50 year_8 data[8] 51 year_4data[7] 52 year_2 data[6] 53
year_1 data[5]
11
6. Example for Transmitted Time Frame
Table 10 clarifies the use of the different fields in the PM protocol
through an example, which is explained here. For binary words shown in
this example in ※{ }§, the most-significant bit (MSB) appears to the
left and is broadcast first. The date and time encoded in this example
correspond to July 4, 2012at 17:30 UTC, and would have beenbroadcast
between the instances 17:30:00 and 17:31:00. In other words, the
minute being encoded in the broadcast is the one that has already
started, as has always beenthe case with the legacy protocol. The
encoded time is referenced to minute 0, which started at the instance
of the turn of the century (00:00:00 UTC on January 1st in the year
2000). Therefore, this example date and time correspond to the
6,578,970th minute of the century, when considering 60 minutes per
hour and 24 hours per day. Hence, the 26-bit field time[25:0],
corresponding to this instance, holds the binary representation
equivalent to the decimal value 6,578,970. Bit time[25], in location
18, representsthe MSB and is zero in this example (will not be set to
one until after the middle of the century), and bit time[0], in
location 46, represents the LSB and is zero in this example since this
minute count is an even number. Note that time[0] also appears in
location 19, which is a marker in the legacy protocol. Usingthe parity
equations provided in section 4.3, the parity bits for the time-word
are found to be {1 0 0 1 0}, placed in time_par[4:0], where
time_par[4] is the MSB. The sync word bits are represented by the
13-bit word sync_T[12:0] (since this is a time information frame
rather than a message). These 13 bits are independent of the time
andhave the fixed values of {0 0 1 1 1 0 1 1 0 1 0 0 0}, as specified
in Table .3 Since July 4th falls while daylight-saving-time (DST) has
been in effect for over one day, the dst_ls[4:0] bits are set to {1 1
0 1 1 } indicating, as shown in Table 4, that the DST state bits
dst_on[1:0]are both set to 1, and leap_sec is set to 0. The
dst_ls[1:0] bits, being set to { 1 1 }, signify that DST has been in
effect for more than one day, and that the next DSTtransition would be
the end of the DST period. The leap_sec notification bit being 0
indicates, as shown in Table 4, that there will be no leap second
added to the last minute of this month (July). It is to be noted that
the previous month, June 2012, had a leap second added at its end (the
minute starting at 23:59:00 UTC on June 30th had 61 seconds),
following which the leap second notification bit was to be reset from
1 to 0 untilanother leap second is decided uponand is to be announced.
The dst_next[5:0] field is set to {0 1 1 0 1 1} which, as shown in
Table 8, indicates, along with dst_on[1] being set to 1, that the
transition out of DST is to occur on the first Sunday of November at
02:00AM local time (at the local time zone, ifDST is observed, the
time is to be moved back to 01:00AM). The notice bit in location 49,
which is a marker, is set to 1, indicating the NIST has a notice
posted at http://www.nist.gov/pml/div688/grp40/wwvb.cfm, notifying of
changes to the WWVB broadcast signal, anticipated downtime, etc. In
this example, the bits at locations 29 and 39, which are markers, are
arbitrarily set to 0 and1, respectively, carrying no information at
this time, as these are reserved for future used. The bit in location
59, which is a marker, is always set to 0. The assignment of the AM
bits adheres to the legacy protocol, which may be found at this link:
http://tf.nist.gov/general/pdf/1383.pdf.
12
Table 10 - Example of one-minute time frame (legacy protocol in black,
PM in red)
Second 0 1 2 3 Legacy AM/PWM Marker min_40 min_20 min_10 bit value 0 1
1 Phase sync_T[12] sync_T[11] sync_T[10] sync_T[9] bit value 0 0 1 1
Second 10 LegacyAM/PWM 0 bit value 0 Phase sync_T[2] bit value 0
Second 20 Legacy AM/PWM 0 bit value 0 Phase time[24] bit value 0
Second 30 Legacy AM/PWM day_8 bit value0 Phase time[15] bit value 0
SecondLegacy AM/PWM bit value Phase bitvalue 40 UT1_0.8 0 time[6] 0 11
00 sync_T[1] 0 21 0 0 time[23] 0 31 day_4 1 time[14] 1 41 UT1_0.41
time[5] 0 51 year_4 0 dst_ls[1] 14 0 0 sync_T[8] 1 5 min_8 0 sync_T[7]
0 6 min_4 0 sync_T[6] 1 7 min_2 0 sync_T[5] 1 8 min_1 0 sync_T[4] 0 9
Marker sync_T[3] 1 19 Marker time[0] 0 29 Marker R 0 39 Marker R 1 49
Marker notice 1 59 Marker 0 0
12 13 14 15 16 17 18 hour_20 hour_10 0 hour_8 hour_4 hour_2 hour_1 0 1
0 0 1 1 1 sync_T[0] time_par[4] time_par[3] time_par[2]time_par[1]
time_par[0] time[25] 0 1 0 0 1 0 0 22 day_200 0 time[22]1 32 day_2 1
time[13] 1 42 UT1_0.2 0 time[4] 1 23 day_100 1time[21] 1 33 day_1 0
time[12] 0 43 UT1_0.1 0 time[3] 1 24 0 0 time[20] 0 34 0 0 time[11] 0
44 0 0 time[2] 0 25 day_80 1 time[19] 035 0 0 time[10] 0 45 year_80 0
time[1] 1 26 day_40 0 time[18] 1 36 UT1_S[2] 1 time[9] 1 46 year_40 0
time[0] 0 27 day_20 0 time[17] 0 37 UT1_S[1] 0 time[8] 147 year_20 0
dst_ls[4] 1 28 day_10 0 time[16] 0 38 UT1_S[0] 1 time[7] 0 48 year_10
1 dst_ls[3] 1
Second 50 Legacy AM/PWM year_8 bit value 0 Phase dst_ls[2] bit value0
52 53 54 55 56 57 58 year_2 year_1 0 LYI LSW DST[1] DST[0] 1 0 0 1 0 1
1 dst_ls[0] dst_next[5] dst_next[4] dst_next[3] dst_next[2]
dst_next[1] dst_next[0] 1 0 1 1 0 1 1
13 S$GUY PEREA

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