1<!doctype html> 2<html lang="en"> 3<head> 4 <meta charset="utf-8" /> 5 <meta name="viewport" content="width=device-width, initial-scale=1" /> 6 <title>Notices & licenses â How Radar Sees</title> 7 <meta name="robots" content="noindex" /> 8 <link rel="icon" type="image/svg+xml" href="./favicon.svg" /> 9 <style> 10 :root { color-scheme: light dark; } 11 body { 12 max-width: 42rem; margin: 0 auto; padding: 2rem 1.25rem 4rem; 13 font: 16px/1.6 ui-sans-serif, system-ui, "IBM Plex Sans", sans-serif; 14 color: #1a1a1a; background: #ffffff; 15 } 16 @media (prefers-color-scheme: dark) { body { color: #e2e5ea; background: #0e1116; } } 17 h1 { font-size: 1.5rem; } h2 { font-size: 1.15rem; margin-top: 2rem; } 18 a { color: inherit; } 19 pre { 20 white-space: pre-wrap; font: 12px/1.5 ui-monospace, monospace; 21 padding: 0.75rem 1rem; border: 1px solid rgba(128,128,128,0.35); border-radius: 6px; 22 overflow-x: auto; 23 } 24 p.back { margin-bottom: 2rem; } 25 </style> 26</head> 27<body> 28 <p class="back"><a href="./">← Back to the essay</a></p> 29 <h1>Notices & attribution</h1> 30 31 <p><strong>How Radar Sees</strong> is an educational, interactive retelling of the physics and 32 engineering described in three YouTube videos by the channel <strong>Noise In Space</strong>. 33 All credit for the original analysis belongs to the creator â please watch the originals:</p> 34 <ul> 35 <li><a href="https://www.youtube.com/watch?v=jbp3kdJZ1_A">âIs Starlink A Secret Radar Constellation?â</a></li> 36 <li><a href="https://www.youtube.com/watch?v=-GTpBMPjjFc">âHow The U.S. Will Track EVERY Vehicle from Space: SAR GMTI/AMTIâ</a></li> 37 <li><a href="https://www.youtube.com/watch?v=U6veU66z2TQ">âThe Insane Engineering of Starlink V3â</a></li> 38 </ul> 39 40 <h2>Ported simulation engine â Noise In Space (MIT)</h2> 41 <p>The radar physics on this site (range equation, SNR budget, resolution, Doppler, DPCA, NESZ, 42 atmospheric loss) is ported from the creatorâs open-source simulations at 43 <a href="https://github.com/noiseinspacechannel">github.com/noiseinspacechannel</a> 44 (NIS-Starlink-Radar-Video, NIS-SAR-AMTIGMTI-Video, NIS-Starlink-Video), released under the 45 MIT License:</p> 46 <pre>MIT License 47 48Copyright (c) 2026 noiseinspacechannel 49 50Permission is hereby granted, free of charge, to any person obtaining a copy 51of this software and associated documentation files (the "Software"), to deal 52in the Software without restriction, including without limitation the rights 53to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 54copies of the Software, and to permit persons to whom the Software is 55furnished to do so, subject to the following conditions: 56 57The above copyright notice and this permission notice shall be included in all 58copies or substantial portions of the Software. 59 60THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 61IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 62FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 63AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 64LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 65OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 66SOFTWARE.</pre> 67 68 <h2>three.js (MIT)</h2> 69 <p>3-D rendering by <a href="https://threejs.org">three.js</a>:</p> 70 <pre>The MIT License 71 72Copyright © 2010âpresent three.js authors 73 74Permission is hereby granted, free of charge, to any person obtaining a copy 75of this software and associated documentation files (the "Software"), to deal 76in the Software without restriction, including without limitation the rights 77to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 78copies of the Software, and to permit persons to whom the Software is 79furnished to do so, subject to the following conditions: 80 81The above copyright notice and this permission notice shall be included in 82all copies or substantial portions of the Software. 83 84THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 85IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 86FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 87AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 88LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 89OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 90THE SOFTWARE.</pre> 91 92 <h2>
92satellite.js (MIT)</h2> 93 <p>SGP4 orbit propagation for the live constellation figure by 94 <a href="https://github.com/shashwatak/satellite-js">satellite.js</a>:</p> 95 <pre>MIT License 96 97Copyright (C) 2013 Shashwat Kandadai, UCSC Jack Baskin School of Engineering 98 99Permission is hereby granted, free of charge, to any person obtaining a copy 100of this software and associated documentation files (the "Software"), to deal 101in the Software without restriction, including without limitation the rights 102to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 103copies of the Software, and to permit persons to whom the Software is 104furnished to do so, subject to the following conditions: 105 106The above copyright notice and this permission notice shall be included in all 107copies or substantial portions of the Software. 108 109THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 110IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 111FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 112AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 113LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 114OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 115SOFTWARE.</pre> 116 117 <h2>Data</h2> 118 <ul> 119 <li><strong>Starlink orbital elements (TLEs)</strong> â courtesy of 120 <a href="https://celestrak.org">CelesTrak</a>, Dr. T.S. Kelso. Fetched live and 121 edge-cached for two hours to respect CelesTrakâs update cadence; a bundled snapshot 122 serves as offline fallback.</li> 123 <li><strong>Coastlines</strong> â <a href="https://www.naturalearthdata.com/">Natural Earth</a> 124 (ne_110m_coastline), public domain.</li> 125 </ul> 126 127 <h2>Assets & fonts</h2> 128 <ul> 129 <li><strong>Starlink satellite 3-D models</strong> â built procedurally for this site (no 130 third-party assets). Dimensions follow SpaceX-published material: the Oct 2022 FCC filing, 131 the âBrightness Mitigation Best Practicesâ paper (2022), and the 132 <a href="https://starlink.com/updates/starlink-version-3-satellites">Starlink V3 update</a>.</li> 133 <li><strong>IBM Plex Sans</strong> â © IBM Corp., licensed under the 134 <a href="https://openfontlicense.org">SIL Open Font License 1.1</a>, served via Google Fonts.</li> 135 </ul> 136</body> 137</html>
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