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doc:lps:toda3 [2018-06-15 08:42]
kristoffer 		doc:lps:toda3 [2018-11-06 14:10]
arnaud
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 ====== TDoA 3 set up ====== ====== TDoA 3 set up ======
  
-<WRAP center round tip 80%> +TDoA 3 is part of the official Crazyflie and LPS Node firmware releases since 2018.10.
-**NOTE** +
-The TDoA3 mode is experimental. The protocol and implementation might change but is fairly stable. +
-</WRAP>+
  
-===== Compile and flash =====+The Crazyflie will automatically detect that the positioning system is using TDoA3 and switch to the correct mode. 
 +If you want to force the Crazyflie to use TDoA3 on startup, use the LPS_TDOA3_ENABLE=1 compile option
  
-To try it out you will have to do the following:+==== The LPS Nodes ====
  
-==== The Crazyflie ====+  * Configure the Nodes as anchors, and set the mode to TDoA 3 
 +  * Set anchor positions, see below.
  
-  * Get the latest source code for the firmware from [[https://github.com/bitcraze/crazyflie-firmware]]. Make sure the git submodules are updated +===== Setting anchor positions =====
-  * Compile for TDoA3 and force the TDoA mode with ''make "EXTRA_CFLAGS=-DLPS_TDOA_USE_V3 -DLPS_TDOA_ENABLE"'' +
-  * Flash the Crazyflie with ''make cload'' script.+
  
-==== The LPS Nodes ====+Anchor positions can be set by the python client or the tool in the lps-node-firmware repo. 
 +You might have to move the Crazyflie close to all anchors to transfer the positions from the Crazyflie. 
  
-  * Get the latests source code for the firmware from [[https://github.com/bitcraze/lps-node-firmware]]. Make sure the git submodules are updated +All the anchors work in the same coordinate system, so you need to choose a common origin for your system. Try to expand your system step by step, testing it at each step to catch problem when they start to happen.
-  * Compile +
-  * Flash the nodes using ''make dfu'' +
-  * Configure the Nodes as anchors, and set the mode to TDoA 3 +
-  * Anchor positions can be set using the python client (0 - 7) but if you have more anchors you will have toools/lpp/set_positions.py script.py+
  
 ===== 2D positioning ===== ===== 2D positioning =====
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 Recompile the Crazyflie firmware using the LPS_2D_POSITION_HEIGHT compile flag set to the desired Z. Recompile the Crazyflie firmware using the LPS_2D_POSITION_HEIGHT compile flag set to the desired Z.
-For instance ''make "EXTRA_CFLAGS=-DLPS_TDOA_USE_V3 -DLPS_TDOA_ENABLE -DLPS_2D_POSITION_HEIGHT=1.2"'' if the tag will be located at 1.2 meters height.+For instance ''make "EXTRA_CFLAGS=-DLPS_2D_POSITION_HEIGHT=1.2"'' if the tag will be located at 1.2 meters height.
  
 ===== Longer range and lower bitrate ===== ===== Longer range and lower bitrate =====
 +
 +Note: this is experimental functionality that is not fully tested or might not work as expected.
  
 In this mode the UWB bitrate is lower and the data of messages can be read at a longer distance. The packet rate will be reduced though. In this mode the UWB bitrate is lower and the data of messages can be read at a longer distance. The packet rate will be reduced though.
  
-Recompile both Crazyflie and anchors with the LPS_LONGER_RANGE compile flag.+Recompile the Crazyflie firmware with the LPS_LONGER_RANGE compile flag.
  
-Example: ''make "EXTRA_CFLAGS=-DLPS_TDOA_USE_V3 -DLPS_TDOA_ENABLE -DLPS_LONGER_RANGE"''+Example: ''make "EXTRA_CFLAGS=-DLPS_LONGER_RANGE"'' 
 + 
 +There is a setting for the bitrate in the Anchor configuration when connecting using USB.
  
 ===== Longer preamble ===== ===== Longer preamble =====
 +
 +Note: this is experimental functionality that is not fully tested or might not work as expected.
  
 It is possible to use a longer preamble, this will also reduce packet rate. There is no compile flag for this setting, it requires some code modifications in the Crazyflie and the anchors. It is possible to use a longer preamble, this will also reduce packet rate. There is no compile flag for this setting, it requires some code modifications in the Crazyflie and the anchors.
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 ==== The LPS Nodes ==== ==== The LPS Nodes ====
  
-  * Find the src/uwb.c file +  * There is a configuration setting for the preamble length
-  * Locate the call to dwEnableMode() +
-  * Change the second argument to MODE_LONGDATA_MID_ACCURACY +
-  * Find the src/uwb_tdoa_anchor3.c file +
-  * Locate the line where PREAMBLE_LENGTH_S is defined +
-  * Change it to 1024 bits: #define PREAMBLE_LENGTH_S ( 1024 * 1017.63e-9 ) +
-  * Compile and flash+
  
 ===== Sniffing ===== ===== Sniffing =====
  
-If an anchor is configured to act as a sniffer, it can be used to listen to the UWB messages in the system. To set an anchor to sniffer mode, connect via USB.+Sniffing the system is useful when you want to start digging into the radio messages exchanged between the anchor. It is a debug functionality. 
 + 
 +If an anchor is configured to act as a sniffer, it can be used to listen to the UWB messages in the system. To set an anchor to sniffer mode, connect via USB and configure it to sniffer mode.
  
 ==== Basic sniffing ==== ==== Basic sniffing ====
doc/lps/toda3.txt · Last modified: 2020-05-12 14:08 by kimberly

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