684
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 03 Apr 2024
684 points (99.3% liked)
World News
39032 readers
2263 users here now
A community for discussing events around the World
Rules:
-
Rule 1: posts have the following requirements:
- Post news articles only
- Video links are NOT articles and will be removed.
- Title must match the article headline
- Not United States Internal News
- Recent (Past 30 Days)
- Screenshots/links to other social media sites (Twitter/X/Facebook/Youtube/reddit, etc.) are explicitly forbidden, as are link shorteners.
-
Rule 2: Do not copy the entire article into your post. The key points in 1-2 paragraphs is allowed (even encouraged!), but large segments of articles posted in the body will result in the post being removed. If you have to stop and think "Is this fair use?", it probably isn't. Archive links, especially the ones created on link submission, are absolutely allowed but those that avoid paywalls are not.
-
Rule 3: Opinions articles, or Articles based on misinformation/propaganda may be removed. Sources that have a Low or Very Low factual reporting rating or MBFC Credibility Rating may be removed.
-
Rule 4: Posts or comments that are homophobic, transphobic, racist, sexist, anti-religious, or ableist will be removed. “Ironic” prejudice is just prejudiced.
-
Posts and comments must abide by the lemmy.world terms of service UPDATED AS OF 10/19
-
Rule 5: Keep it civil. It's OK to say the subject of an article is behaving like a (pejorative, pejorative). It's NOT OK to say another USER is (pejorative). Strong language is fine, just not directed at other members. Engage in good-faith and with respect! This includes accusing another user of being a bot or paid actor. Trolling is uncivil and is grounds for removal and/or a community ban.
Similarly, if you see posts along these lines, do not engage. Report them, block them, and live a happier life than they do. We see too many slapfights that boil down to "Mom! He's bugging me!" and "I'm not touching you!" Going forward, slapfights will result in removed comments and temp bans to cool off.
-
Rule 6: Memes, spam, other low effort posting, reposts, misinformation, advocating violence, off-topic, trolling, offensive, regarding the moderators or meta in content may be removed at any time.
-
Rule 7: We didn't USED to need a rule about how many posts one could make in a day, then someone posted NINETEEN articles in a single day. Not comments, FULL ARTICLES. If you're posting more than say, 10 or so, consider going outside and touching grass. We reserve the right to limit over-posting so a single user does not dominate the front page.
We ask that the users report any comment or post that violate the rules, to use critical thinking when reading, posting or commenting. Users that post off-topic spam, advocate violence, have multiple comments or posts removed, weaponize reports or violate the code of conduct will be banned.
All posts and comments will be reviewed on a case-by-case basis. This means that some content that violates the rules may be allowed, while other content that does not violate the rules may be removed. The moderators retain the right to remove any content and ban users.
Lemmy World Partners
News !news@lemmy.world
Politics !politics@lemmy.world
World Politics !globalpolitics@lemmy.world
Recommendations
For Firefox users, there is media bias / propaganda / fact check plugin.
https://addons.mozilla.org/en-US/firefox/addon/media-bias-fact-check/
- Consider including the article’s mediabiasfactcheck.com/ link
founded 1 year ago
MODERATORS
"dead reckoning" is the technical term for precalculated navigation, adjusting the path only from sensors like IMUs
(unless they used stuff like cameras and POI based navigation, but that seems unlikely)
I don't think it's correct to say normal planes use IMU more than GPS, they're all complementary. GPS tells the general direction and the IMU helps keeping the plane stable (no sudden jerks to turn when the GPS drifts). And ground radar tells the plane when it's too far off the path.
“Dead reckoning” as in “dead reckoning” as in “deduced reckoning”. It’s the same kind of navigating people have done on boats for millennia. You start from a known point and move in a specific direction at a known speed for a specific amount of time. Then you change your speed and/or direction for another specific amount of time. And so on. If you have the ability to do so then you update your known position along the way via known landmarks you might pass.
Yeah but the errors creep up, so if you don't see the islands of hope after sailing for 18 days at speed x, you're fucked :-)
That's why you have several systems, like gps to periodically try to get a good signal, or manual override.
An alternative is terrain mapping. You look at the terrain bellow you and compare in a database. Tomahawks navigate that way.
That navigation system was originally designed for the US nuclear powered doomsday cruise missile which would have zoomed across the USSR at supersonic speeds, low altitude, spewing radiation as it goes and dropping the occasional nuke. It could have done this for days.
Given what they've done elsewhere I wouldn't be surprised if it was 100% remote-piloted via satellite internet (most of their sea drones are controlled via Starlink, for instance) but in the case of fixed infrastructure, a smart fusion of GPS, IMU, and potentially video image matching for terminal guidance (these aren't big bombs in the grand scheme of things and it's important to hit the right part of a sprawling refinery or factory complex in order to knock it out for an appreciable amount of time) could overcome GPS jamming, and be well within the technical capabilities of the Ukrainian arms industry. TERCOM as implemented in the Tomahawk runs on early-80's computing power, and it's only gotten easier. Machine vision frameworks are widely available and well-understood software these days, and can run on fairly modest hobby hardware to boot.