31–40 of 191 posts
Down to 30cm - good! Now all we need is a GPS-enabled app for urban pedestrians that reminds them to look left or right just before they step off a curb into oncoming traffic.
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You could probably trade accuracy of route position for accuracy of distance by averaging samples.
You can see how off the trace can be here: https://i.imgur.com/eHJI8FH.jpg . You could probably do some smoothing to help fit some of this to a street but I've been on runs where I zig zag down streets just to add distance or to do hills.
Maybe try telling it that you're biking instead, my guess is they do more smoothing the higher speed they expect.
RTK is commonly used in survey drones, and kits are available for about $1K.
As an avid hiker and runner I'm more excited to see what this will do for things like Garmin smart watches. I run through downtown Boston a few times a week and the accuracy is very bad at times making you look like you run much farther than you do.
What makes anyone confident in the accuracy of wearable tracking devices? I haven't seen it verified and I wouldn't assume it: Accuracy is expensive, generally speaking, and few consumers will pay for it or even question it - how often have you heard someone mention it?
Or, for example, have you wondered how accurate your simple bathroom scale is? I looked into it a little, wanting to collect accurate health data: IIRC +/- 0.1 kg (~0.2 lbs) is available in Here are a couple articles that found the accuracy of activity trackers wanting. I've seen other articles in places like ZDnet that found the same problems, though based on less rigorous research.
Accuracy of Smartphone Applications and Wearable Devices for Tracking Physical Activity Data in JAMA " rel="nofollow">https://jamanetwork.com/journals/jama/fullarticle/2108876>
Accuracy Of Fitbit Data Seriously Questioned By New Study " rel="nofollow">https://www.sporttechie.com/accuracy-of-fitbit-data-seriousl...
(Sorry if this disrupts your confidence in your data!)
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Apple is also an advertising company - they have unique IDs with your personal information pinned to them, and they sell ads based on your location, too.
You can change your advertising ID any time you want -- and almost none of their revenue comes from ad sales. In 2016, $190B of their $215B in sales was definitively not from ad sales, and the $25B services category that would include ad sales also includes the percentage of sales from the App Store, Apple Pay, Apple Care, iCloud.. etc. Ad sales are immaterial to their business model.
They're the lesser of two evils. Still an evil, though.
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Nothing at all: http://www.aholme.co.uk/GPS/Main.htm
Boy do I miss those types of sites. I need to find more of them.
http://lea.hamradio.si/~s53mv/navsats/theory.html
No FPGAs, RPis, or SDRs --- it's mostly done in discrete logic with a 68000 doing the back-end processing. As a bonus, he also implemented GLONASS. Furthermore, the software takes up less than 32KB of ROM.
As an avid hiker and runner I'm more excited to see what this will do for things like Garmin smart watches. I run through downtown Boston a few times a week and the accuracy is very bad at times making you look like you run much farther than you do.
There are some foot pods that will outperform GPS.
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But that's client side right? What's preventing someone from implementing a GPS receiver using a SDR that doesn't have those restrictions?
Nothing at all: http://www.aholme.co.uk/GPS/Main.htm
But practically speaking, almost all GPSes are made outside of the US and then imported...
Down to 30cm - good! Now all we need is a GPS-enabled app for urban pedestrians that reminds them to look left or right just before they step off a curb into oncoming traffic.