Differences

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--- exploring_lora [2018/10/13 09:40] – [4.1. Time on Air] samer
+++ exploring_lora [2018/10/21 16:02] – [5. Coverage Challenge] samer
@@ Line 137: / Line 137: @@
   * An explanatory video: https://www.youtube.com/watch?v=C_Rh5GSENA4
   * Various calculation tools available online: https://www.loratools.nl/#/airtime, [[https://docs.google.com/spreadsheets/d/1voGAtQAjC1qBmaVuP1ApNKs1ekgUjavHuVQIXyYSvNc/edit?usp=sharing |Spreadsheet]]
+Note that all messages sent and received by the [[https://www.airspayce.com/mikem/arduino/RadioHead/classRH__RF95.html| RH_RF95 RadioHead]] driver we are using conform to this packet format:
+  * 8 symbol PREAMBLE
+  * Explicit header with header CRC (handled internally by the radio)
+  * 4 octets HEADER: (TO, FROM, ID, FLAGS)
+  * 0 to 251 octets DATA
+  * CRC (handled internally by the radio)
 <WRAP center round help 100%>
@@ Line 174: / Line 182: @@
   * Direct transmission between the two devices is only considered.
-  * 3D distance is computed between devices.
+  * 3D distance is computed between devices. You can use for example [[https://support.google.com/earth/answer/148134?hl=en |  Google Earth pro]] or get the elevation from this [[ http://www.geocontext.org/publ/2010/04/profiler/en/ | site]].
   * PDR must be higher than 10% as computed for 100 packets.
+  * Supporting live video and screen capture should be used to authenticate the record.
 <WRAP center round help 100%>
   * Compute the Fresnel zone for your transmission.
-  * Provide the expression of the link budget and compute the received power using two different pathloss models.
+  * Provide the expression of the link budget and compute the received power using two different pathloss models. You can use the following online services [[https://cloudrf.com/ | Cloud RF]], [[https://www.xirio-online.com/ | Xirio]], or [[
+http://www.ve2dbe.com/rmonline.html | VE2DBE]].
   * Compare the received power obtained experimentally with the theoretical results.
-  * Prepare a short presentation to describe your experiment.
+  * Prepare a short presentation (5 minutes pitch) to describe your experiment.
 </WRAP>