egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly…
<queqiao->
⟨dundun92⟩ bro you didnt see the solar lander contract???
<queqiao->
⟨test_account9540⟩ it's gated behind moon impact (crewed), so he may have missed it
<queqiao->
⟨sichelgaita⟩ The class "Geopotential" computes both the potential and the acceleration (the former is needed to draw the equipotentials). The benchmark only looks at the acceleration, because that's the part for which performance matters.
<queqiao->
⟨sichelgaita⟩ This is Switzerland. Cars stop to let frogs cross the road. That cat is safe.
<queqiao->
⟨egg⟩ The cat is on the edge of a parking spot anyway.
<queqiao->
⟨lpg4999⟩ so cat not safe because people can't park?
<queqiao->
⟨egg⟩ Kirk (He/Him) where are you configuring that encoding for the σκοπός ground stations ?
<queqiao->
⟨Kirk (He/Him)⟩ I should have said modulation, not encoding. I believe the encoding is just global based on tech level, but modulation is set in telecom.cfg
<queqiao->
⟨Kirk (He/Him)⟩ This is what I expect to happen (connection vs a normal RA ground station). The vessel antenna has 8PSK modulation, but the ground station only has BPSK modulation and therefore the connection speed is limited to BPSK
<queqiao->
⟨egg⟩ In those UPGRADE things within the Antenna node ?
<queqiao->
⟨Kirk (He/Him)⟩ Yes
<queqiao->
⟨Kirk (He/Him)⟩ Actually most of the antennas don't have modulation defined at all (because RA just defaults to QPSK), but there's no difference in behavior between an antenna with undefined modulation and an antenna with modulation defined to QPSK
<queqiao->
⟨egg⟩ So if I am reading the RA code right, these UPGRADEs should take effect depending on the ground station tech level (RACommNetScenario.GroundStationTechLevel). Is that the case?
<queqiao->
⟨Kirk (He/Him)⟩ Yes, the upgrades do take effect as expected
<queqiao->
⟨Kirk (He/Him)⟩ If I increase ground station tech level in the planner, the stations gain 8PSK modulation as expected
<queqiao->
⟨Kirk (He/Him)⟩ Wait, 5.37 Gbps is not the number I would expect to be there...
<queqiao->
⟨Kirk (He/Him)⟩ If I increase ground station tech level in the planner, the stations gain 8PSK modulation as defined
<queqiao->
⟨egg⟩ Re
<queqiao->
> (you shouldn't be able to send 2.69 Gbps duplex through a 3.07 Gbps channel)The duplex consumption thing operates at a higher level. RA provides the graph, I do the routing and the consumption.
<queqiao->
⟨Kirk (He/Him)⟩ Ok I have no idea what is going on actually
<queqiao->
⟨Kirk (He/Him)⟩ In conclusion, it is actually the encoder's fault and I don't know what to do about it
<queqiao->
⟨Kirk (He/Him)⟩ RA chooses the encoder based on the best achievable Eb/N0, which is reasonable, except the convolutional rate of those encoders varies a lot, which means achievable bitrates vary wildly based on the TL of the transmitter and receiver (a link between a TL5 and TL7 antenna will achieve a rate of 0.87, while every other combination will only achieve a rate of 0.5)
<queqiao->
⟨Kirk (He/Him)⟩ Ok time to test 7! edge cases to see if a bug actually exists
<queqiao->
⟨egg⟩ I know some of these words
<raptop>
7! as in 5040?
<queqiao->
⟨Kirk (He/Him)⟩ Not actually, there's only 7^2 cases
<queqiao->
⟨drveyl⟩ RA chooses the encoder based on the lowest pair tech level.
<queqiao->
⟨drveyl⟩ Vessel modulation rate increases every 2 TL I think.
<queqiao->
Stations have a max modulation rate
<queqiao->
⟨drveyl⟩ Declared in config and can respond to upgrades
<queqiao->
⟨Kirk (He/Him)⟩ No bugs are found when establishing a link to normal RA ground stations. I'm unsure if this is due to some inherent property of RA vs Skopos stations, or because the default RA stations don't mess with modulation settings as much as Skopos stations.
<queqiao->
Speaking of Skopos stations,
<queqiao->
bugs found:
<queqiao->
Kashima (TL7, 8PSK) to Vessel (TL4, 8PSK)
<queqiao->
⟨Kirk (He/Him)⟩ No bugs are found when establishing a link to normal RA ground stations. I'm unsure if this is due to some inherent property of RA vs Skopos stations, or because the default RA stations don't mess with modulation settings as much as Skopos stations.
<queqiao->
Speaking of Skopos stations,
<queqiao->
bugs found:
<queqiao->
Kashima (TL7, 8PSK) to Vessel (TL4, 8PSK)
<queqiao->
⟨Kirk (He/Him)⟩ There's a few more exceptions but I got tired of listing them
<queqiao->
⟨Kirk (He/Him)⟩ drveyl As you can see, there are a few combinations here in which the achieved bitrate exceeds what I would expect to be achieved ("worst bitrate * encoder rate"). Every DSN + antenna combination matches what you would expect with "worst bitrate * encoder rate" (within a few percent, I assume there's 1000 vs 1024 math going on there)
<queqiao->
⟨Kirk (He/Him)⟩ So either I am wildly misunderstanding how encoders work, the planner is lying to me about the encoders, or there's something going on that's causing RA to select the wrong connection speed with some encoder combinations
<queqiao->
⟨drveyl⟩ Though my reading on the phone is less than desirable
<queqiao->
⟨drveyl⟩ Vessel to vessel at high TL also lets you experiment with different modulation selections
<queqiao->
⟨Kirk (He/Him)⟩ Vessel to vessel also exhibits discrepancies from what the planner implies should be the achieved rate. Which makes sense why Skopos stations also trigger it, RA seems to think Skopos ground stations are vessel antennas and not proper ground stations