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Tonight's Sky — Change location
  1. Event Horizon Telescope releases first ever black hole image |
  2. How to perform Gyroscope calibration in Samsung Galaxy Note2(GT-N7100)?

I suppose I could have simply used my fingers to press the propellers down onto the shafts, but the multi-tool made it a bit easier to align the propeller, apply more consistent pressure, and get it into the correct position without breaking the delicate parts. Conversely, the opposite, forked end of the multi-tool is intended to aid in removing the propellers should the need arise to replace them, or if you are planning to place the drone onto the display base for storage.

First I carefully removed the dummy battery cover, then carefully placed the Li-polymer battery in its place on the top of the drone. The cockpit remained lit, while the LEDs began flashing. To power it down, you must remove the Li-polymer battery. To that end, installing the protective cage onto the drone seemed a prudent precaution. The cage is designed in such a way that it can be installed right over the propellers and clipped directly to the motor mounts without having to remove the propellers first. Once installed the drone can sit atop the cage, which prevents the propellers from touching the ground.

The cage is made from a semi-rigid, somewhat springy plastic that can help absorb unintended hard impacts, such as crash landings or crashes into other objects. Also, note that there is a metal neck strap attachment for a lanyard not included. The underside of the controller has several features. A somewhat oval-shaped, rubberized handgrip is mounted on each side. Also, there is a speaker grille from which the sound emanates Star Wars sound effects, audio clips from the Star Wars films, etc. Finally, there is a microphone jack that allows you to use headphones to hear the sounds rather than broadcasting them.

Along the side of the controller, a tiny Phillips head screwdriver has been cleverly hidden. The handle is shaped such that it blends into the contour of the side of the controller. The controller is powered by four 4 standard AA batteries. Accessing the battery compartment requires using the hidden mini-screwdriver to remove the cover, which is held in place by two tiny screws, as shown above.

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Once the batteries have been inserted, a 2-second press on the red Imperial cog button powers up the controller. As soon as the controller is powered on, sound clips from the movie begin playing. Wicked cool. The phone holder is accessed by pulling firmly on a small pull tab, the pulling the holder straight outward.

Event Horizon Telescope releases first ever black hole image |

The phone holder is spring-loaded so that it can stretch to accommodate the width of various phones. My iPhone 6 Plus was a snug fit. The four illuminated blue light surrounding the Imperial crest in the photo above indicates that T-Mode has been activated. After checking out all of the above features, there was only one thing left to do: actually fly the TIE Advanced X1 drone.

I consulted the instruction manual, but it was surprisingly not so obvious how to launch the drone. Considering that I had placed the drone in T-Mode see above , I was surprised at this outcome. Thankfully I had installed the training cage as see above, which I suspect helped prevent damage. I thought that I had likely done something incorrectly, so I re-consulted the instruction manual and determined that it might be useful to calibrate the drone and the controller, and I went through the steps to do this.

My next launch resulting in the same abrupt, odd-direction lift-off and subsequent crash into yet a different wall.

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Instead, it fell out of the sky like a rock, crashing into the ground. Thankfully, the drone was intact, with the exception of having lost each of its four propellers, which had shot off in all directions upon impact. After that incident, I ran the drone and controller through the calibration again, as I had done several times with my indoor flight attempts, and then attempted another Auto-Start in T-Mode. Same frustrating result.

Next, I contacted Propel and explained the situation. The customer service person that responded to me was polite and apologetic, but unfortunately, they suggested that I calibrate the drone and controller. Disappointing, since if you are following along at home, I had already performed the calibration per the instruction manual several times. But I wanted to give the drone a fair shake, so I dutifully ran the calibration again, attempted another Auto-Start launch, and… the same result.

This was very disappointing, because I had not even been able to attempt any of the many aerobatic maneuvers built into the drone, nor fire the weapons systems, not to mention try out an aerial dog-fight against an opponent using the IR Battling feature to be fair, I would have needed someone with another Propel Star Wars drone to attempt any of this. Thank you for the kind words.

Also, yes, the calibration issue was a big issue for me. Great review! Thank you! The geometric delays from the transmitter to each antenna are needed to determine the calibration delays between antennas. At lower frequencies, i. Gilliland et al. The index of refraction n is on average 1. Omitting the refractive index would therefore introduce a timing mismatch of 1.

This value is therefore significant at intermediate and longer baselines. This can be improved by combining results from multiple transmitters. However, in order to obtain the correct solution it is then required that the different transmitters have larger differences in period than the phase or timing noise. Moreover, in general the correct calibration phase depends on frequency, i. When using a custom beacon for calibration measurements as described here, it is preferred therefore to choose frequencies that are far apart.

How to perform Gyroscope calibration in Samsung Galaxy Note2(GT-N7100)?

Once antenna timings have been calibrated, the relative phases can be monitored over time without reference to the transmitter location and geometric delays. Crosses indicate channels with detected transmitters. Nevertheless, in all observations there are several signals present that come from narrowband transmitters.

Therefore, spectral cleaning methods are required to remove them from astronomical observation data. The phase variance is shown in the upper data points red. It consistently becomes lower whenever a narrowband transmitter is seen in the power spectrum. An example power spectrum is shown in Fig. However, this case is still not too extreme, and spectral cleaning is indeed necessary in similar instances. We treat each of the two instrumental polarizations separately as RFI signals may be detectable in only one of the two polarizations.

In what follows we focus only on the low-band spectra as these are best used for air shower measurements; the methods work identically for the high-band antenna data. The result is shown in Fig. The phase variance, taken as the median value of the 48 antennas, is shown as the upper signal. It has random noise due to the finite number of data blocks; at frequencies where a narrowband transmitter is present in the power spectrum lower curve , the variance is significantly lower. The random noise has a median value of 0.

This is a basic test of our randomness assumption for the phases. The phase variance threshold is then set to a value of nearly six sigma. The standard deviation is estimated by the 95th percentile value minus the median, which is about 1. Every frequency channel with lower phase variance is flagged.

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This is especially important when a large block size is taken, e. The number of adjacent channels to flag is currently set as a manually tunable parameter, scaling with frequency resolution. Flagged frequencies are shown as red dashed lines. The lower panel shows the phase variance, where the black horizontal line indicates the threshold for flagging. Although the RFI-quiet noise level would follow a smooth curve, fitting the curve and RFI flagging using the excess power are interdependent.

In Fig. For calibration of short time series, i. Moreover, the phase variance we measure in the spectral cleaning algorithm, and the corresponding timing precision, is found to be best for these frequencies. Therefore, we work with the high-frequency transmitters, especially the strongest one at The radio signals at frequencies For The timing calibration signal follows from the relative phases after accounting for the geometric delays between transmitter and antennas, according to Eq.


The relative phases are once again obtained from the FFT of 50 consecutive data blocks, taking average phases as from Eq. Monitoring of a cross-calibration over time would still be accurate see Sect. This is a cartesian coordinate system, allowing for an easy calculation of straight-line distance between two points. As a starting point we take an existing LOFAR timing calibration per antenna, which is performed using astronomical phase-calibration a few times a year van Haarlem et al.

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There are many more stations, but our air shower measurements are limited to this area. Red solid bars represent the median time delay per LOFAR station 48 antennas ; the stations are separated by the vertical grid lines. The phases correspond to a timing correction per antenna as shown in Fig.