Billy Koffler

aerospace & electrical engineer

[Billy Koffler @BillythekidKoff]

@RadishHarmers I heard they used Mithril

[Billy Koffler @BillythekidKoff]

@JohnDCook You probably know this and are being purposefully obtuse… but people were angry a no bid contract was awarded to a friend’s company that did a shit job at cleaning it. A nice tidy example for many other such cases of corruption that some people are also angry about.

[Billy Koffler @BillythekidKoff]

@stringlandscape @davidbessis

[Billy Koffler @BillythekidKoff]

@RadishHarmers Be careful of being under the influence of the Platonic realm while driving or operating heavy machinery.

[Billy Koffler @BillythekidKoff]

@gregeganSF Would be interesting to see if there is a solution for intersection distance between a pair of ants with any 2 “wander angle” offsets away from one of the principal directions. It seems here you are assuming same initial wander angle but slightly offset in initial ant position?

[Billy Koffler @BillythekidKoff]

@CalculusCanvas Why bring determinants into this if you’re just showing the matrix construction?

[Billy Koffler @BillythekidKoff]

@charliekirk11 Wait I thought the money was supposed to trickle down?

[Billy Koffler @BillythekidKoff]

@SandyofCthulhu https://t.co/PGhlbXN6bz

[Billy Koffler @BillythekidKoff]

@SandyofCthulhu Trade deficit = tariff? Please elaborate.

[Billy Koffler @BillythekidKoff]

@Anthony_Bonato Erlang distribution

[Billy Koffler @BillythekidKoff]

@HiroNishikawa This is going for $2k on Amazon. Would love to pick up a copy if they ever print more.

[Billy Koffler @BillythekidKoff]

@Jess_Riedel I agree but don’t like the premise. IMO you’d want to implement both methods for cross validation. Cost constraints would lead you to the design using GR since it doesn’t require the extra unspecified meas process. This may fall under OP’s qualifier to “correctly engineer” GPS.

[Billy Koffler @BillythekidKoff]

@Jess_Riedel Interesting, I see. In most unmodeled error estimation problems, wouldn’t the performance only approach that of the agorithm that has knowledge of the physical model? Looks like there is a more recent Galileo paper https://t.co/ISNZvN5jqW

[Billy Koffler @BillythekidKoff]

@Jess_Riedel @WKCosmo Recommend reading “principles of GNSS, inertial, and multisensor integrated navigation” by Paul Groves. He references Ashby and Spilker “introduction to relativistic effects on the Global Positioning System”. In appendix G, Groves asserts you need both SR and GR.

[Billy Koffler @BillythekidKoff]

@WKCosmo Didn’t mean to imply the description was wrong, just that it wouldn’t be overly specific to use RF in the description if we’re talking about GNSS on Earth. Thank you for clarifying.

[Billy Koffler @BillythekidKoff]

@WKCosmo Radio waves traveling at light speed is what you mean, no?

[Billy Koffler @BillythekidKoff]

@RBehiel @ThePhysicsMemes Rare Okapi content

[Billy Koffler @BillythekidKoff]

@HiroNishikawa I’m more of a “by inspection” guy myself. Maybe someday I’ll graduate to things being obvious.

[Billy Koffler @BillythekidKoff]

@FrnkNlsn Is Sahraee & Wriggers Tensor Calculus and Diff Geometry for engineers a good prerequisite? Seems very similar to the 3rd one pictured.

[Billy Koffler @BillythekidKoff]

@CalcInsights_ Should probably follow this one with a Gaussian Elimination post for a more efficient method