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Hsinchu
Please tell us a bit about your UAV interest
Interested in UAV related technology and its applications.
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Hsinchu
Activity Feed
"Performance of small antennas could vary greatly. It's best for the antenna vendors to show how good their small antennas are compared to survey antennas. SkyTraq could only work on the receiver side to bring state of art performance. It'll likely…"
With enough satellite signals, single frequency RTK receiver works well under open sky environment. Of available ones on the market, we have yet to see one that works well in environment with surrounding trees and buildings. The above video shows a…
"Any one doing interpolation from end points will get a straight line. Nope, it's walking the rounds collecting receiver result every second."
"There are some earlier discussions on how to trigger camera with Pixhawk:
http://diydrones.com/profiles/blogs/how-to-guide-pixhawk-auto-camer...
http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A1424...
The same Pixhawk trigger signal…"
http://diydrones.com/profiles/blogs/how-to-guide-pixhawk-auto-camer...
http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A1424...
The same Pixhawk trigger signal…"
"For aerial mapping, using time tag to derive position may be questionable. If UAV is flying at 50Km/hr, even at 10Hz raw measurement update rate, it’s 139cm between two 10Hz locations. Unless UAV is flying straight at constant velocity, otherwise…"
"The system claims that by storing measurements at time of camera trigger signal and post process to get the exact position, there is no need of radio link for sending base station data to the rover on the mapping UAV; it avoids potential RTK…"
"Raw measurement output is in SkyTraq binary format: http://navspark.mybigcommerce.com/content/AN0030_1.4.31.pdf"
"We don't see higher update rate any better than lower update rate. It should mainly be dictated by application requirement. Arducopter code default requires 5Hz GPS, thus using 1Hz RTK the behavior appears to be a bit strange, jerking sometimes. …"
"In the earlier two replies to Nikola, one can see after getting RTK fix, there should be no jump in position output to cause drone to fly away suddenly if the interval dropping to float is short 90 seconds for example. If loosing RTK fix for a very…"
"Below image shows static testing, initially in RTK fix state (point at of center scatter plot), intentionally stop sending base data for 90 seconds, it goes from fix to float to DGPS mode, then start sending base data again it gets RTK fix. The…"
"@Pedram Not sure if the question is about how RTK improves drone application in general. If that’s the question, knowing position of a drone in cm-level accuracy would allow consistent repeatable flight path or landing at a fixed location; might be…"
"@Nikola Rabchevsky When losing RTK becoming float, it still maintain good smooth track. In this blog with Dynamic Testing with 4.5Km Baseline on a very heavy rainy day in the lower section, the figure below is mostly float solution and few sporadic…"
"@ Pascal P. Unlike normal GPS that gets position fix in seconds that everyone is accustomed to, lower cost single-frequency RTK receiver takes minutes to get RTK fix, longer it takes with lesser number of satellites. Dual-frequency receiver takes…"
"Our drone pilot is not that familiar with ArduCopter code, so no modification done with firmware. Otherwise we would like to do better demo of stable hover using RTK altitude replacing barometric altitude, and tune PID for lesser horizontal drift.…"
"In our testing, a pair of 915MHz radio is used to send base station data to the rover NS-HP-5 on the quadcopter. Additional pair of 433MHz radio is used to send NMEA output in parallel to a laptop on the ground to monitor RTK float/fix behavior;…"
Holidays Greetings!There is much interest in seeing demo of our $50 pre-order NS-HP RTK receiver on a quadcopter, so we tested last week on a less windy day (with up to 4.5mph wind). A compass module and 5Hz version of NS-HP RTK receiver replaced…
