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misc:investigations:lps-max-range [2017-03-21 16:15]
kristoffer 		misc:investigations:lps-max-range [2021-06-24 16:39] (current)
kimberly
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 +<WRAP center round important 60%>
 +This page has deprecated and will be archived. Please go to [[https://www.bitcraze.io/]].
 +</WRAP>
 +
 ====== Measurements of maximum ranges for the Loco Positioning system ====== ====== Measurements of maximum ranges for the Loco Positioning system ======
  
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 The LEDs on the deck and anchor indicates when the module is in transmit and receive mode as well as when a ranging operation is completed. Our measurement method was simply to walk away from the anchor with the Crazyflie and watch the LEDs and observe when we stared to loose packets. The LEDs on the deck and anchor indicates when the module is in transmit and receive mode as well as when a ranging operation is completed. Our measurement method was simply to walk away from the anchor with the Crazyflie and watch the LEDs and observe when we stared to loose packets.
 +
 +The radios are setup on //channel 2// with preamble rate of //64MHz//, preamble lenght of 128 and datarate of //6.8Mbps//. Higher range can be expected with different settings like longer preamble and slower datarate, though this would also reduce the ranging speed of the system and it has not been tested in this experiment.
  
 === Power settings === === Power settings ===
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 Indoors there are walls, the floor and other objects that bounces and echoes the radio waves sent out by the system. Outside there are usually fewer obstacles and typically only the ground that effects the transmitted energy. Obviously this makes a difference and we wanted to see if we could measure it.  Indoors there are walls, the floor and other objects that bounces and echoes the radio waves sent out by the system. Outside there are usually fewer obstacles and typically only the ground that effects the transmitted energy. Obviously this makes a difference and we wanted to see if we could measure it. 
  
-Note that echoes might actually be something good that increases the signal strength.+Note that for an ultra-wideband system echo and multipath can actually help decoding the packet: the receiver will be able to use the energy from the first direct path and from the echoes to decode the packet.
  
 The "longest" space that was available to us is a corridor in our office building. It is not optimal since it is very narrow and probably enhances the signal strength, we expect it to show better results than in an big open room. The corridor is 16 meters long why this is the maximum distance we could measure inside. The "longest" space that was available to us is a corridor in our office building. It is not optimal since it is very narrow and probably enhances the signal strength, we expect it to show better results than in an big open room. The corridor is 16 meters long why this is the maximum distance we could measure inside.
  
-For outdoors measurements we used the street outside the office. It is fairly open but the buildings on the sides are probably affecting the results somewhat. +For outdoors measurements we used the street outside the office. It is fairly open but the buildings on the sides are probably affecting the results somewhat.
  
 === Antenna orientation === === Antenna orientation ===
misc/investigations/lps-max-range.1490109300.txt.gz · Last modified: 2017-03-21 16:15 by kristoffer

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