![]() Not anymore! Run Cheetah! Run as fast as you can so you don’t miss a single moment of this “Natural Anthem”-a.k.a. What do you do? Traditionally you would try and gather the herd, round up the team and roll out of the beer garden together. Meanwhile the others don’t even realize that one of the best shows of the entire festival has just commenced. Two of them have to pee, one needs pizza, and another needs to borrow someone’s wrist band so they can go get their boyfriend in. Instead you’re in the beer garden with 20 of your besties who are all wasted. Just then a typical scenario arises: In your mind you want all hands on deck everyone you’re with should drop what they’re doing and run like cheetahs through the herd of cattle to get as close to the stage as possible. The one band you’ve been dying to see for over a decade is playing the main stage at COACHELLA! The time finally rolls around that this undeniably incredible band, ahem-The Postal Service-begins their set. ![]() The party beacon comes in especially handy when: We present these techniques to describe a new optical communication concept, and to encourage others to consider observing and analyzing our upcoming test flights.A beauty shot of the beacon… and Hamish of course… Worked examples with both simulated and experimental (long-range ground test) data illustrate the methods used. We describe the techniques of extreme background-rejection needed to achieve this, including spectral filtering and temporal filtering using a period- and phase-recovery algorithm, and discuss the requirements for an error-correcting code to encode the ID number. In this paper, we focus on the details of the encoding scheme and data analysis that allow a milliwatt optical signal to be read from orbit. The concept has been validated in ground tests, and orbital prototypes are scheduled for launch in 2018 and beyond. ELROI is smaller and lighter than a typical radio beacon, low-power enough to run on its own small solar cell, and can safely operate for the entire orbital lifetime of a satellite or debris object. ELROI uses short, omnidirectional flashes of laser light to encode a unique ID number that can be read by a small ground telescope using a photon-counting sensor and innovative extreme background-rejection techniques. The extremely low-resource optical identifier (ELROI) is a concept for an autonomous, low-power optical “license plate” that can be attached to anything that goes into space. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith. ![]()
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