![File:Astro-Inertial Navigation System, 1962 - Lockheed SR-71A Blackbird, 1966 - Evergreen Aviation & Space Museum - McMinnville, Oregon - DSC01058.jpg - Wikimedia Commons File:Astro-Inertial Navigation System, 1962 - Lockheed SR-71A Blackbird, 1966 - Evergreen Aviation & Space Museum - McMinnville, Oregon - DSC01058.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Astro-Inertial_Navigation_System%2C_1962_-_Lockheed_SR-71A_Blackbird%2C_1966_-_Evergreen_Aviation_%26_Space_Museum_-_McMinnville%2C_Oregon_-_DSC01058.jpg/1610px-Astro-Inertial_Navigation_System%2C_1962_-_Lockheed_SR-71A_Blackbird%2C_1966_-_Evergreen_Aviation_%26_Space_Museum_-_McMinnville%2C_Oregon_-_DSC01058.jpg)
File:Astro-Inertial Navigation System, 1962 - Lockheed SR-71A Blackbird, 1966 - Evergreen Aviation & Space Museum - McMinnville, Oregon - DSC01058.jpg - Wikimedia Commons
![TIL that the astro-inertial navigation system of the SR-71 worked by tracking the stars through a circular quartz glass window on the upper fuselage. Its "blue light" source star tracker, which could TIL that the astro-inertial navigation system of the SR-71 worked by tracking the stars through a circular quartz glass window on the upper fuselage. Its "blue light" source star tracker, which could](https://external-preview.redd.it/BTeu5xurqNDialzu0BRn7ZAaKgsa42k71CTFDrGmW9g.jpg?auto=webp&s=8d647e93344885e62c90771d1e2a5137cf3e725e)
TIL that the astro-inertial navigation system of the SR-71 worked by tracking the stars through a circular quartz glass window on the upper fuselage. Its "blue light" source star tracker, which could
![Figure 5 from Realization of an autonomous integrated suite of strapdown astro-inertial navigation systems using unscented particle filtering | Semantic Scholar Figure 5 from Realization of an autonomous integrated suite of strapdown astro-inertial navigation systems using unscented particle filtering | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/3a5cf220aa5ebe5c5c569b5ca564e4af9398c879/11-Figure5-1.png)
Figure 5 from Realization of an autonomous integrated suite of strapdown astro-inertial navigation systems using unscented particle filtering | Semantic Scholar
![A view of the control panels aboard a C-5A Galaxy aircraft with the triple inertial navigation system (INS) installed during the VOLANT GALAXY program Stock Photo - Alamy A view of the control panels aboard a C-5A Galaxy aircraft with the triple inertial navigation system (INS) installed during the VOLANT GALAXY program Stock Photo - Alamy](https://c8.alamy.com/comp/W2FMPH/a-view-of-the-control-panels-aboard-a-c-5a-galaxy-aircraft-with-the-triple-inertial-navigation-system-ins-installed-during-the-volant-galaxy-program-W2FMPH.jpg)