HFU HF Underground
Loggings => DGPS => Topic started by: ChrisSmolinski on July 06, 2017, 1706 UTC
-
Fake DX:
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
2 643 686 687 309.0 200 Ken Saki Japan 35.142 139.685 10,883 330
2 894 288 289 292.0 100 Cape Hinchinbrook, AK Alaska 60.242 -146.656 5,181 320
13 706 006 006 313.0 200 Gladstone, QD Australia -24.039 151.365 15,196 276
Cape Hinchinbrook, AK:
Thursday, July 6, 2017 05:45:48
Thursday, July 6, 2017 13:26:59
It's really Kensington, SC with a bit error of 96 decimal, 0x60 hex. Nice try.
Real DX:
Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
18 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 579 12
38 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 2,046 241
62 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 901 320
67 927 316 317 309.0 200 Lauzon, QC Canada 46.821 -71.165 920 29
84 934 336 337 307.0 200 Fox Island, NS Canada 45.361 -61.097 1,442 59
107 944 342 343 310.0 200 Cape Norman, NL Canada 51.509 -55.831 2,091 44
115 936 332 333 319.0 200 Point Escuminac, NB Canada 47.075 -64.8 1,278 46
140 925 320 321 313.0 200 Moise, QC Canada 50.202 -66.119 1,443 32
199 940 338 339 315.0 200 Cape Race, NL Canada 46.661 -53.075 2,076 60
213 814 028 029 293.0 200 English Turn, LA United States 29.886 -89.947 1,608 231
218 809 018 019 289.0 100 Cape Canaveral, FL United States 28.467 -80.554 1,292 196
499 816 032 033 304.0 100 Aransas Pass, TX United States 27.842 -97.065 2,269 241
876 937 330 331 298.0 200 Hartlen Point, NS Canada 44.583 -63.45 1,238 60
1154 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 1,444 308
3548 935 334 335 312.0 200 Western Head, NS Canada 43.993 -64.67 1,124 61
3908 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 1,257 316
4715 939 326 327 295.0 200 Partridge Island, NB Canada 45.239 -66.056 1,085 52
6834 942 340 341 288.0 200 Cape Ray, NL Canada 47.636 -59.241 1,671 52
7015 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 1,414 203
7829 926 318 319 300.0 200 Riviere du Loop, QC Canada 47.762 -69.606 1,073 31
11274 808 016 017 314.0 200 Card Sound, FL United States 25.442 -80.452 1,619 193
13649 929 312 313 296.0 200 St Jean Richelieu, QC Canada 45.324 -73.317 693 24
15846 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 427 338
19995 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 1,002 296
20118 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 723 198
27213 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 590 301
28362 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 858 49
30679 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 503 181
33306 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 307 173
35014 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,367 247
36924 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 378 70
52960 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 489 35
53981 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 561 64
57597 870 170 171 309.0 200 Reedy Point, DE United States 39.569 -75.572 121 97
58940 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 266 70
59625 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 82 158
-
How did you know it had a bit error of 0x60?
-
How did you know it had a bit error of 0x60?
I compared the transmitted IDs of 288 and 192, the difference is 96, which is 0x60 in hex. Maybe I should add an option to display station IDs in hex, that might make it easier to figure out what the real station is in cases like this. Of course that only works when a real DGPS station's message is being corrupted, you could have cases where all the bits of a fake message are generated by static. Maybe it's really Quantum Vacuum Noise ;D
-
It it still puzzles me, how can the bits have errors like this, yet the checksum passes. The noise has to be _just_ right in the current message and the previous message.
-
It it still puzzles me, how can the bits have errors like this, yet the checksum passes. The noise has to be _just_ right in the current message and the previous message.
Given an infinite number of monkeys generating static...