SeaStreak NJ

The ferry passed in front of the SILD site at 13:25 GMT.  Erick could see it in range cell 6 of SILD

Low Range at SEAB

The Bragg at SEAB dropped off after range cell 12.   I turned off the enhanced blanking at 12:45 GMT.  That improved the range a little.  Bragg now out to range cell 20.  The spectra has less noise and clutter.

Second Possible Target

http://www.vesseltracker.com/en/Ships/Barcarolle-9116383.html

First possible target

The Thomas Jefferson

http://www.vesseltracker.com/en/Ships/Thomasjefferson-8892033.html

The signal is more in loop 2 and monopole which makes sense that the ship is to the left of the radar when looking to sea.

DHS Experiment Day 01

We’re conducting the first exercise today of the NY Observatory for the CSR grant.   The SILD, SEAB, HOSR, HOOK HF Radar sites are operational.  The BRZY site is not working.  It was sent back to Codar for repairs.  The SILD Tx and Rx were also sent back to Codar for repairs.  We are using the multi frequency system at SILD in its place.

The current map for the harbor looks decent without BRZY.

SILD     25.1 MHz    -100.7 kHz    2 Hz SWR   Blank 486.6 us (43 km)

HOSR    24.65 MHz  -100.7 KHz  2Hz SWR   Blank 486.6 us (43 km)

SEAB     13.46 MHz  -49 KHz  2Hz SWR   Blank 668.8 us (60 km)  enhanced blanking is turned on.

The range on the SEAB site is low.

Target All match

The following figures are taken from the file created by plot_all_matches. The file (trg_match_all.dat) is an output with the specified FFT length and Threshold. It is a very useful output because gives important information about the detection of the ship. In addition, this output is important because we can gather information that allows us to produce a graph on the map, showing the detection rate.

Potential Test Case

Here is a potential test case to run the detection algorithm on.  I looked on the AIS stream and saw that there were 3 vessels in the area.  The Andre Jacob could be one of the vessels.

LOVE and BRIG

WE follow the track of the MAAS TRADER down the south shore of New Jersey. And use the range files from LOVE and BRIG site to see if it was possible to detect it with the 5 mHz.

The results using the IIR method and Median Method are as follow For LOVE

These are the results for the BRIG site

Both sites detect ships but not the MAAS trader. It seems that the 5 mHz does detect ship but not the ship that we are looking for. I am doing more test and see if we can identify which ship the data is detecting.

Oleander and MAAS Trader

This is the path of the MAAS trader and the Oleander for February 26 2009. The ships have different time track. The MAAS trader is traveling from 00:00 to 01:00 South heading to Brigantine. We lost the track between 01:00 – 03:00 and pick it up from 04:00 to 06:30.

The track of the Oleander is from 22:00 to 24:00. In this case the ship is moving away from the Radar, heading south-east, from Seabright.

In the next Figure is a comparison between the detection rate in SeaBright for the MAAS Trader and Oleander

The following is for the Oleander in SeaBright.

Take into consideration that is different time we do see different ships during that period of time. I need to identify which ships are and their characteristics.

Tidal Analysis 3

Tidal Analysis 3 compares NOAA current velocity predictions at Punta Ostiones with CODAR V component current velocity readings at 5 points oriented 343º from the station. Figure 1 shows five red placemarks labeled Point A through E, each one 3km or a range cell apart. Point A is located on range cell 6 while Point E is located on range cell 2. Yellow placemarks indicate the three points selected for Tidal Analysis 2.

 Root mean square (RMS) speed differences between CODAR observations and NOAA predictions range from 28.7–8.4 cm/s. They improve significantly as we evaluate points closer to the CDDO station (e.g. At Point C an RMS speed difference of 21.1cm/s is found, at Point D the difference is 13.2 cm/s, and at Point E 8.4 cm/s). It is possible that bathymetry might be contributing substantially to this contrast. Correlation coefficients are highest at point A with a value of 0.8890. Other correlation coefficients range between 0.5385 and 0.6138.

 Figure 2 compares the graphical output of NOAA current velocity predictions at Punta Ostiones with CODAR observed current velocity at selected points.

Figure 1

Figure 2