Radio Detection Basics – Software – JAnalyzer

 

JAnalyzer

 

This software was also written by Esko Lyytinen and his son Öllie. It too is freeware.This written in Java so it can be run on any system that has Java installed on it. I have run this on Windows XP, Linux, Unix, and on an Apple iMac (Pentium).

Janalyzer is a lot more flexible than it’s ancestor, mAnalyzer. The user can control fft bin sizes, timing, rates of image scans, and data output.

Like mAnlayzer, JAnalyzer has a small footprint, the executable .jar file is only 118 kb in size.

I usually run JAnalyzer so it produces 3 FFT spectrograms. The first is a time compressed image that contains a full 24 hours in a single line. The image can store a week’s with of data in one image. I do this so I can see aurora, Es, lightening, and other sources of interference. Having a weekly time compressed image also aids in seeing weekly trends. The image below original size is 1043 x 680.

24 hours a line

All echoes seen in the time compression are over dense echoes. Normal duration echos are not seen at this compression rate. A careful look shoes the long duration echoes in the first row which is August 9, 2010, start off rather spotty. As we approach the peak of the Perseids on the 13th we see more and more over dense echoes.  The light gray blocks are created by man made noise, washer and dryers, microwave ovens, and arching AC lines during high winds.

The second FFT image is an image of the past 24 hours as seen below. This helps me easily spot overdense echoes that I might be able to correlate with the all-sky video camera. Original image size is 964×2750.

Daily August 13th Perseid peak

 

The  image above shows many overdense, long duration echoes. It also shows the noisy periods as well. if you look carefully you’ll see an occasional carrier streaking across the pass band. Hint the last line of the image at 1200 UT. Hash marks are at 1 minute intervals. There are two lines per hour – the shorter line is the end of each hour.

The third FFT image is a fast scan. It usually scans at a rate of an image every three minutes. It can run faster so head echoes can be seen.

(Reminder add fast scan image here).

A cursor over the start of an echo will show the frequency of the echo as well as it’s start time. Moving the cursor to the end of the echo shows the end time.

I have JAnalyzer set to generate 3 text files. One is a 10 minute file which is similar but not the same as the mdata file mentioned in the mAnalyzer section. It records four sets of power bins and the counts and duration of each bin. It also produces an hourly report much like it’s mAnalyzer counter part, mhdata. If my research problem requires it, I have the program write a line for every echo heard.

The individual raw echo file format is:

2010-03-03 14:20:37.487, 00003, 02.29745, 03.03210
2010-03-03 14:21:13.626, 00013, 02.61173, 03.79104
2010-03-03 14:22:17.924, 00042, 03.09038, 04.30555
2010-03-03 14:22:42.468, 00002, 01.22930, 01.31838

YYYY-MM-DD HH:MM:SS.sss Time stamp beginning of echo

Duration of echo (timing depends on fft buffer size) To determine duration count you divide buffer size by sample rate. I run several buffer sizes at 8000 samples per second. Buffers can be 256, 512, 1024, and so on. For example a one unit of duration recorded with a 1024 at 8000 samples per second = 0.128 of a second or 128 ms. And unit for a bin of 256 at 8000 samples/sec =  0.032 sec or 32 ms

Mean Audio power in log(2)  (That is, the mean of the logarithmic values)

Maximum power in log(2)

Radio Detection Basics – Software – mAnalyzer

 

mAnalyzer

This software was written by Esko Lyytinen and his son Ölle. It is freeware. It is not used by many observers any more as it is getting a bit dated. It does however,  have several features going for it.

  1. It can be used on old, less capable computers running Windows95 and up.
  2. It has a very small foot print memory and hard drive wise
  3. It is not a cpu hog.
  4. It automatically records four amplitude ranges and records the duration of echoes for each amplitude category.
  5. It prints files every 10 minutes and hourly
  6. The file output format is supported by Colorgramme/Color Lab so can be used for automatic ftp to the RMOB live site.
  7. A 24 hour spectrogram image is saved at the end of the day.
  8. It has the ability to notch out a carrier in the echo count pass band if needed.
  9. Compares a 100 Hz pass band for echo signals and compares it to a nearby noise band.
  10. No scripts or programming needed, it’s plug and play.
  11. Runs for months without attention.

For the reasons listed above I run mAnalyzer in parallel with Spectrum Lab as cheap insurance.  It has saved critical data several times over the year when others have failed for various reasons.

Here is a sample of the 24 hour image produced by mAnalyzer (size has been reduced):

mANalyzer 24 hr

Blue hash marks are minute marks, light blue are ten minute markers, and red are the hourly markers. It takes two line per hour. This compressed time scale is an aide in seeing Es, sporadic E interference, aurora, and broadband noise that often affect the counts. This image was produced on 2010-01-03, the day of the Quadrantids peak. As can be seen there are two bands of clustered echo returns. Between the two is a few hours with less echoes than either side. This is a somewhat common occurrence caused by the radiant of the shower moving through the 45 degree elevations of the station’s site (maximum echoes at the two 45 degree points).

The format of the hourly result file (mhdata.txt) looks like this:

201001031000    10    0.043271    206
201001031100    11    0.043342    221
201001031200    12    0.052527    274
201001031300    13    0.051171    272
201001031400    14    0.052452    288

YYYYMMDDHHMM  UT hour  duration (percentage of period) and echo count for the hour.

The 10 minute file (mdata.txt) has this format:

201001031400,0.956661,0.015585,0.016652,0.010675,0.000427,0.000000,0.000000,27.817250,   11,   19,   15,    1,    0
201001031410,0.945536,0.018368,0.022426,0.013669,0.000000,0.000000,0.000000,28.487399,   15,   17,   20,    0,    0
201001031420,0.950897,0.015585,0.024125,0.009394,0.000000,0.000000,0.000000,27.483348,   12,   20,   14,    0,    0
201001031430,0.942357,0.022630,0.025833,0.008540,0.000213,0.000000,0.000427,27.523708,   17,   19,   12,    1,    0
201001031440,0.952818,0.020068,0.020709,0.005978,0.000000,0.000000,0.000427,27.587142,   19,   16,   12,    0,    0
201001031450,0.936166,0.021136,0.023271,0.019214,0.000213,0.000000,0.000000,28.522844,   12,   16,   19,    1,    0
201001031500,0.963691,0.016446,0.013242,0.006621,0.000000,0.000000,0.000000,27.663178,   20,   19,   10,    0,    0

Left to right:

  1. YYYYMMDDHHMM
  2. Percentage of time with no signal
  3. Percentage of time with Level 1 echoes 1-10 dB
  4. Percentage of time with Level 2 echoes 11-20 dB
  5. Percentage of time with Level 3 echoes 21-30 dB
  6. Percentage of time with Level 4 echoes 31-40 dB
  7. Percentage of time with Level 5 echoes > 40 dB Not used
  8. Percentage of time with with possible noise or interference
  9. Audio Index shows jumps if receiver volume control or sound card sound input changes.
  10. Level 1 echo counts 1-10 dB
  11. Level 2 echo counts 11-20 dB
  12. Level 3 echo counts  21-30 dB
  13. Level 4 echo counts 31-40 dB
  14. Level 5 echo counts > 40 dB Not used

2015-11-13 : WT1190F – Play by Play BLOG

015-11-13 : 10:21 PST. Splashdown was last night at 22:19  PST in SRI LANKA off coast of Matara. Was late evening on USA Westcoast Thursday. Please enjoy my Blog. This is a conversation between young post-grad scientist Subath Amaradasa of the “Near Earth Objects” Team at the University of Ruhuna, who is on ground with French scientists from European Space Agency and William Smith who is the Hoyle-Shield coordinator at Cattle Point DARK SKY Urban Star Park, Victoria, Canada.

PS There will be a post script to the Snoopy event. Snoopy is almost certainly the Apollo 10 lunar lander – aka Snoopy. Its orbit which reaches way past the moon, makes this almost certain. No wonder it burned out. Very high speed entering the upper atmosphere. Ten times the speed of the fastest bullet on earth. Being small and with no shielding, no wonder it quickly burned out. Thanks to Rick Nowell for inspiring Subath Amaradasa and his “Near Earth Object” team at the University of Ruhuna in Matara, Sri Lanka.

The AllSky Meteor Cam at the College of the Rockies in Cranbrook BC

AllSky Geminids Stack 11 Frames

 

 

 

 

 

 

 

 

 

This is the College All-sky meteor cam showing the eleven brightest Dec 15 meteors stacked on one frame, from 7pm until 2am when it clouded over. North at top of photo and East to the left. Two bright fireballs on the horizon! That trail of dots there is Jupiter rising. Some clumps of dots are just aircraft strobes.

AllSky Geminids Stack 11 Frames

 

 

 

 

 

 

 

 

 

And here’s the 11 meteor stack for Dec 14 from 9pm until 1:15am, when it clouded over. About the same each evening.

Geminid Meteor StreakAnd just for fun, here’s all the photos stacked from the camera watching Ursa Minor over a 43 minute period, taken with 30 second exposures, 28mm f/2.5 lens, 1000 ISO.

Geminids from Invermere By Robert Ede

Geminids from Invermere

This photo was taken facing South, showing Orion before the Moon rose, from Invermere by Robert Ede. He says: I saw some beauties. A few with smoke trails.

WT1190F – Play by Play BLOG

2015-11-13 : 10:21 PST. Splashdown was last night at 22:19  PST in SRI LANKA off coast of Matara. Was late evening on USA Westcoast Thursday. Please enjoy my Blog. This is a conversation between young post-grad scientist Subath Amaradasa of the “Near Earth Objects” Team at the University of Ruhuna, who is on ground with French scientists from European Space Agency and William Smith who is the Hoyle-Shield coordinator at Cattle Point DARK SKY Urban Star Park, Victoria, Canada.

 

PS There will be a post script to the Snoopy event. Snoopy is almost certainly the Apollo 10 lunar lander – aka Snoopy. Its orbit which reaches way past the moon, makes this almost certain. No wonder it burned out. Very high speed entering the upper atmosphere. Ten times the speed of the fastest bullet on earth. Being small and with no shielding, no wonder it quickly burned out. Thanks to Rick Nowell for inspiring Subath Amaradasa and his “Near Earth Object” team at the University of Ruhuna in Matara, Sri Lanka.