{"id":2250,"date":"2017-10-31T20:45:28","date_gmt":"2017-10-31T18:45:28","guid":{"rendered":"http:\/\/www.itluxembourg.lu\/site\/?page_id=2250"},"modified":"2020-05-24T15:45:19","modified_gmt":"2020-05-24T13:45:19","slug":"ultimate-lrs","status":"publish","type":"page","link":"https:\/\/www.itluxembourg.lu\/site\/ultimate-lrs\/","title":{"rendered":"Ultimate LRS"},"content":{"rendered":"<p><a href=\"http:\/\/www.rcgroups.com\/forums\/showthread.php?t=2037442\">Discussion forum on RCgroups is here<\/a>.<\/p>\n<h1>Introduction<\/h1>\n<h2>Description<\/h2>\n<p>This projects provides\u00a0drone and FPV flyers\u00a0with\u00a0a long range 1 watt bidirectionnal link for remote control and telemetry. Use it to\u00a0replace your other telemetry or LRS systems\u00a0by a single system having many\u00a0advantages :<\/p>\n<h2>Performances<\/h2>\n<p>With 1W or power, the Ultimate LRS provides full telemetry and RC control for hobby flyers.<\/p>\n<h2>Speed<\/h2>\n<p>The speed of Ultimate LRS allows to make all mavlink operations in the air. For example connecting, modifying parameters in flight, uploading new waypoints, or any other mavlink command.<\/p>\n<p>It not only support the default Mission Planner telemetry speed, but can handle much more such as 10 refresh per second for the attitude and position, giving completely smooth artificial horizon movements.<\/p>\n<p><iframe loading=\"lazy\" title=\"Ultimate LRS 2.0 : Long range RC &amp; telemetry for Mission Planner and APM Planner\" src=\"https:\/\/player.vimeo.com\/video\/137746307?dnt=1&amp;app_id=122963\" width=\"530\" height=\"298\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<p><iframe loading=\"lazy\" title=\"Ultimate LRS and 3DR radio connection speed comparison\" src=\"https:\/\/player.vimeo.com\/video\/133086385?dnt=1&amp;app_id=122963\" width=\"530\" height=\"298\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<p>A more detailed features comparison with 3DR radios is provided <a href=\"https:\/\/www.itluxembourg.lu\/site\/ultimate-lrs-or-3dr-radio\/\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a>.<\/p>\n<div id=\"attachment_1051\" style=\"width: 434px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.itluxembourg.lu\/site\/ultimate-lrs\/\" rel=\"attachment wp-att-1051\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1051\" class=\"size-full wp-image-1051\" src=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/09\/2015-09-27-22_06_18-Program-Manager.png\" alt=\"Fast RC link &amp; Mavlink telemetry : 72 packets per second\" width=\"424\" height=\"196\" srcset=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/09\/2015-09-27-22_06_18-Program-Manager.png 424w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/09\/2015-09-27-22_06_18-Program-Manager-300x139.png 300w\" sizes=\"auto, (max-width: 424px) 100vw, 424px\" \/><\/a><p id=\"caption-attachment-1051\" class=\"wp-caption-text\">Fast RC link &amp; Mavlink telemetry : 72 packets per second<\/p><\/div>\n<h2>Complete documentation<\/h2>\n<p>The project provides a complete documentation\u00a0on this site, including clear installation instructions, links to user videos and content, complete spectrum analysis, proposed mods etc.<\/p>\n<h2>Active community<\/h2>\n<p>A very active user community has grown <a href=\"http:\/\/www.rcgroups.com\/forums\/showthread.php?t=2037442\" target=\"_blank\" rel=\"noopener noreferrer\">in this rcgroups forum<\/a>. Feel free to join the community\u00a0and propose your ideas and suggestions, or get answers to your questions.<\/p>\n<p>Users have made new 3D printed cases, new antennas designs and videos,click <a href=\"https:\/\/www.itluxembourg.lu\/site\/ultimate-lrs-user-provided-content\/\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a> to see some user provided videos and other ULRS related creations.<\/p>\n<h2>Simplicity<\/h2>\n<p>The Ultimate LRS is complex inside and simple outside : no technical settings to guess, it&#8217;s just plug and play.<\/p>\n<h2>Evolutive<\/h2>\n<p>Ultimate LRS is a part of a larger project, that includes a complete ground station with a 3D virtual cockpit. This is not the latest status, but gives an idea of the features :<\/p>\n<p><iframe loading=\"lazy\" title=\"OSD Cockpit for FPV : 3D cockpit + HUD + 3D radar + antenna tracker + google earth\" src=\"https:\/\/player.vimeo.com\/video\/23092643?dnt=1&amp;app_id=122963\" width=\"530\" height=\"298\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<h1>Features<\/h1>\n<h2>Ultimate LRS Control Center<\/h2>\n<p>The ULRS CC is a software running on Windows, which will allow to\u00a0burn \/ upgrade the firmware, check the live status, select channels, modify parameters etc.<\/p>\n<p>Its main features are described below :<\/p>\n<h3>Status overview<\/h3>\n<p>This page shows information about the ULRS, such as :<\/p>\n<ul>\n<li>Current servo values,<\/li>\n<li>Global RSSI,<\/li>\n<li>RSSI per channel<\/li>\n<li>Background noise per channel<\/li>\n<li>Chip temperature,<\/li>\n<li>Connection statistics.<\/li>\n<\/ul>\n<p>It&#8217;s a single-page overview of the system health. It&#8217;s possible to simultaneously display\u00a0this page, Mission Planner andr another ground control software.<\/p>\n<p>The status page shows also the firmware version,\u00a0failsafe status, and can detect other issues such as uninitialized parameters.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1451\" src=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_00_19-Ultimate-LRS-Control-Center-Version-2.29-beta.png\" alt=\"2016-07-15 07_00_19-Ultimate LRS Control Center - Version 2.29 beta\" width=\"1041\" height=\"820\" \/><\/p>\n<p>The Status\u00a0page shows the available COM ports, and will detect automatically ULRS modules connected, if they are RX or TX, and their baudrate (TX = 57600, RX = 19200).<\/p>\n<p>When an ULRS module is detected, its type appears in the selection box on top of the screen, along with the firmware version :<\/p>\n<p><a href=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_02_18-Ultimate-LRS-Control-Center-Version-2.29-beta.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1452\" src=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_02_18-Ultimate-LRS-Control-Center-Version-2.29-beta.png\" alt=\"2016-07-15 07_02_18-Ultimate LRS Control Center - Version 2.29 beta\" width=\"452\" height=\"37\" srcset=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_02_18-Ultimate-LRS-Control-Center-Version-2.29-beta.png 452w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_02_18-Ultimate-LRS-Control-Center-Version-2.29-beta-300x25.png 300w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/><\/a><\/p>\n<p>Select the correct serial port and click on connect.<\/p>\n<h3>Real-time spectrum analyzer<\/h3>\n<p>It&#8217;s on the screenshot above, the &#8220;Channels&#8221; box : this view shows the currently selected channels,\u00a0and interesting data about them. The light green bar represents the signal strength for a given channel, and the dark green bar is the noise level for the channels. What&#8217;s important is to have a low noise level, and a high signal level. The difference between the two is called the SNR (signal to noise ratio).\u00a0Currently no other LRS system provide this information, especially not in real time and per channel. The numerical values are expressed in dBm.<\/p>\n<p>To understand why this is useful, think about a sound signal : someone talks to you and there&#8217;s\u00a0almost no background noise, so you hear him or her very well. Then he\/she walks progressively farther, while keeping the same voice volume. You hear less and less and at a certain distance you only understand some words. When a car passes near you, you don&#8217;t understand anything because it&#8217;s too noisy, except if the speaker is really close to you. So what&#8217;s important is not the speaker&#8217;s perceived volume, but the volume in comparison to the background noise.<\/p>\n<p>It&#8217;s the same for the ULRS. Rather than just measuring the perceived volume (Signal Strength), we will also measure the background noise. The difference between the perceived volume and the background noise is the only interesting data, namely the signal-to-noise ratio or SNR. And in Decibels, it&#8217;s really simple, it&#8217;s the difference between the noise level measured in dBm, and the signal level measured in dBm. You know understand the different columns. In the screenshot above, we can see the signal level is between -68 dBm and -66 dBm for all channels. So we could think that all channels are good. But if we look at the SNR, the first and third\u00a0channels have a lower SNR (= are less prone to errors). So it could be a good idea to replace them by other channels. If we want to understand the cause, we have a look at the Noise column, and we see they both have a high noise level (-98 dBm and -101 dBm are greater noise than for example -113 dBm).<\/p>\n<p>So in practice, just look at the Channels, the values should be high and about the same for all channels. As the distance will grow, the value will lower, and at the limit\u00a0we will see the quality degrade, as progressively more packets will be lost. Your exact limit value is to be determined experimentally, as some users fly a lot in autopilot and are not afraid of loosing some packets, while others prefer to fly manually and\u00a0require a large security margin.<\/p>\n<p>You&#8217;ll see it&#8217;s really very useful. In a future release it will be possible to monitor this while at the same time having Mission Planner running. And in a more future release, to change the channels while in flight. And of course in future future release, the channels will be dynamically allocated during the flight.<\/p>\n<p>The last thing to know about this, is that the SNR value has a physical meaning : every time you double the distance, the SNR value will be diminished by 6 dB. And it&#8217;s quite precise. In a future release, the current distance will be calculated automatically (from mavlink data), and the maximum reachable distance will be calculated from the SNR. Simple calculation, but high practical value.<\/p>\n<h3>Firmware upgrade page<\/h3>\n<p>Well, it&#8217;s as simple as can be : After being connected, click on the Upgrade firmware button, and that&#8217;s it. And where do you select if it&#8217;s a TX or RX ? You don&#8217;t need to, because it&#8217;s the same firmware for TX and RX : if the firmware detects PPM it will act as a TX, else it will be a RX.<\/p>\n<p><a href=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1454\" src=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta.png\" alt=\"2016-07-15 07_13_07-Ultimate LRS Control Center - Version 2.29 beta\" width=\"1040\" height=\"816\" srcset=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta.png 1040w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta-510x400.png 510w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta-300x235.png 300w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta-768x603.png 768w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_13_07-Ultimate-LRS-Control-Center-Version-2.29-beta-1024x803.png 1024w\" sizes=\"auto, (max-width: 1040px) 100vw, 1040px\" \/><\/a><\/p>\n<h3>The Spectrum Analyzer page<\/h3>\n<p>This page shows a spectrum analyzer with\u00a0the average and maximum values for all frequencies. Additional features are coming to select the start and stop frequencies, and be able to show the channels.<\/p>\n<p>An interesting feature is that it provides a view over the full sensitivity of the RFM23BP, as shown below noise values down to -120 dBm are measured. The large peaks have their frequency and signal level displayed automatically:<a href=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/spectrum-analyzer.png\"><br \/>\n<\/a><\/p>\n<p><a href=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1455\" src=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta.png\" alt=\"2016-07-15 07_15_45-Ultimate LRS Control Center - Version 2.29 beta\" width=\"1037\" height=\"816\" srcset=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta.png 1037w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta-510x401.png 510w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta-300x236.png 300w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta-768x604.png 768w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-07-15-07_15_45-Ultimate-LRS-Control-Center-Version-2.29-beta-1024x806.png 1024w\" sizes=\"auto, (max-width: 1037px) 100vw, 1037px\" \/><\/a><\/p>\n<h3>Parameters<\/h3>\n<p>Click on the &#8216;Change parameters&#8217; and you&#8217;ll get a popup showing the current parameters. The rule is very simple : select the same channels and bindcode on the TX and on the RX.<\/p>\n<p>The bindcode can be seen as a simple signature. The TX and RX must have the same bindcode.\u00a0ULRS will reject any packet that has not the bindcode it&#8217;s waiting for. This is important because the number of channels is not infinite, and it&#8217;s possible that someone picks one of the same channels you&#8217;ve selected.<\/p>\n<p>Clicking on apply will save the parameters to the module.<\/p>\n<p><a href=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1722\" src=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters.png\" alt=\"2016-11-19-22_14_35-new-parameters\" width=\"688\" height=\"688\" srcset=\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters.png 688w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters-400x400.png 400w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters-100x100.png 100w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters-510x510.png 510w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters-150x150.png 150w, https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2015\/08\/2016-11-19-22_14_35-New-parameters-300x300.png 300w\" sizes=\"auto, (max-width: 688px) 100vw, 688px\" \/><\/a><\/p>\n<p>The goal of this beta version is to test ULRS on different computers, identify bugs and collect your ideas and suggestions to improve the next release. You can\u00a0bring any new idea or make comments on this page or by email.<\/p>\n<h1>Where\u00a0do I start ?<\/h1>\n<p>Start by <a href=\"https:\/\/www.itluxembourg.lu\/site\/material\/\">checking the material you&#8217;ll need<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Discussion forum on RCgroups is here. Introduction Description This projects provides\u00a0drone and FPV flyers\u00a0with\u00a0a long range 1 watt bidirectionnal link for remote control and telemetry. Use it to\u00a0replace your other<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":25,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-2250","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/pages\/2250","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/comments?post=2250"}],"version-history":[{"count":20,"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/pages\/2250\/revisions"}],"predecessor-version":[{"id":3089,"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/pages\/2250\/revisions\/3089"}],"wp:attachment":[{"href":"https:\/\/www.itluxembourg.lu\/site\/wp-json\/wp\/v2\/media?parent=2250"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}