NavCom LAND-PAK Rev.N - Manual (Page 116)

Technical Reference Manual Rev. N
Blk = All; Blu = IOP w/Internal Radio ; Red = IOP & LBM ; Grn = Engine only 114
0x83 - Ionosphere and UTC Data - 32 bytes
This message provides the ionosphere correction data and the Universal Coordinated Time
(UTC) information. Dual frequency users (L1 and L2) correct the time received from the SV by
utilizing the time delay differential between L1 and L2. Single frequency users (L1 only) may use
the ionosphere model.
Record
Usage Command - No
Response - Yes Input: Not used;
Output: reports network information by sub-ID; not supported my 0x20
Ref Message Field Description
Data
Type
Units Range Scale
Byte
Count
STX 02 (hex) U08 1
PRA1 99 (hex) U08 1
PRA2 66 (hex) U08 1
ID 83 (hex) U08 1
Length 0x0020 U16 2
W1 GPS week of collection, since Jan 6, 1980 U16 week 0 - 65535 2
W2 GPS time of week of collection U32 sec 0 - 604800 4
W3 alpha0 S08 1
W4 alpha1 S08 1
W5 alpha2 S08 1
W6 alpha3 S08 1
W7 beta0 S08 1
W8 beta1 S08 1
W9 beta2 S08 1
W10 beta3 S08 1
W11 A1 S32 4
W12 A0 S32 4
W13 UTC reference time (Tot) U08 sec
Notes
1 & 2
1
W14 UTC reference week (WNt) U08 week 1
W15 Time difference (dTLS) S08 sec 1
W16 Week of leap seconds (WNLSF) U08 week 1
W17 Day number of leap seconds (DN) U08 day 1
W18 Time difference (dTLSF) S08 sec 1
CKSM Checksum U08 1
ETX 03 (hex) U08 1
1: Data values are decoded from SV navigation message per GPS-ICD-200C,
but not scaled.
2: GPS Time – [W13] +604800 (reference sheet 123 of GPS-ICD-200 Rev. C)
3: Output cannot be ‘by rate’, ‘on trigger’, or ‘by SV’.