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muccc / iridium-toolkit

A set of tools to parse Iridium frames
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Is there some way to get the position of the ISU(iridium terminal)? #87

Closed tianyasy closed 2 years ago

tianyasy commented 2 years ago

In SBD, 0x070500 can show the position information, but it seems not like the position of the ISU

tianyasy commented 2 years ago

and in LCW, the contents of geo-loc is all 0s.

tianyasy commented 2 years ago

there is a alogrithm tdoa chan. but I don't kown the meaning of dtoa from lcw type maint[2]

tianyasy commented 2 years ago

thre is some datas from lcw maint[2]: lcw, dir_1, f_228, ch_178, sn_2804, maint[2], dtoa_2, dfoa_0. lcw, dir_1, f_453, ch_178, sn_4985, maint[2], dtoa_1, dfoa_0. lcw, dir_1, f_586, ch_178, sn_6768, maint[2], dtoa_0, dfoa_5. lcw, dir_1, f_590, ch_178, sn_6867, maint[2], dtoa_0, dfoa_4. lcw, dir_1, f_594, ch_178, sn_7024, maint[2], dtoa_0, dfoa_4. lcw, dir_1, f_598, ch_178, sn_7101, maint[2], dtoa_0, dfoa_2. lcw, dir_1, f_602, ch_178, sn_7150, maint[2], dtoa_127, dfoa_3. lcw, dir_1, f_606, ch_178, sn_7191, maint[2], dtoa_0, dfoa_2. lcw, dir_1, f_610, ch_178, sn_7299, maint[2], dtoa_1, dfoa_7. lcw, dir_1, f_614, ch_178, sn_7359, maint[2], dtoa_0, dfoa_6. lcw, dir_1, f_622, ch_178, sn_7505, maint[2], dtoa_0, dfoa_6. lcw, dir_1, f_626, ch_178, sn_7575, maint[2], dtoa_127, dfoa_1. lcw, dir_1, f_630, ch_178, sn_7637, maint[2], dtoa_1, dfoa_3. lcw, dir_1, f_634, ch_178, sn_7798, maint[2], dtoa_0, dfoa_2. lcw, dir_1, f_638, ch_178, sn_7942, maint[2], dtoa_127, dfoa_2. lcw, dir_1, f_642, ch_178, sn_8068, maint[2], dtoa_1, dfoa_2. lcw, dir_1, f_646, ch_178, sn_8143, maint[2], dtoa_127, dfoa_0. lcw, dir_1, f_650, ch_178, sn_8247, maint[2], dtoa_1, dfoa_0. lcw, dir_1, f_654, ch_178, sn_8301, maint[2], dtoa_127, dfoa_0. lcw, dir_1, f_658, ch_178, sn_8358, maint[2], dtoa_1, dfoa_1. lcw, dir_1, f_662, ch_178, sn_8409, maint[2], dtoa_0, dfoa_0. lcw, dir_1, f_670, ch_178, sn_8520, maint[2], dtoa_0, dfoa_1. lcw, dir_1, f_674, ch_178, sn_8637, maint[2], dtoa_0, dfoa_0. lcw, dir_1, f_678, ch_178, sn_8745, maint[2], dtoa_0, dfoa_127. lcw, dir_1, f_686, ch_178, sn_9035, maint[2], dtoa_127, dfoa_126.

tianyasy commented 2 years ago

so, in the data showed above, what mean 2 in dtoa or 1....127?

Sec42 commented 2 years ago

Github issues are not intended for questions. Additionally you put two different questions in this thread.

To answer the original question: I am not aware of any Iridium phone or SBD receiver sending their position. This would require them to have a GPS which (to my knowledge) they do not have.

All positions that the toolkit decodes are sent from the satellite and refer to either the satellite position, or the estimated center point of a spot-beam (which is approx 400km in diameter).