The FAA airport radar

        The FAA airport radar is located east of san juan (at pico del este). It is used for traffic control around Puerto Rico (it is not the radar used for landing the planes).
    Prior to Aug13  the radar used 1330,1350 Mhz with  5 usecs  pulses at each frequency

      A new CARSR (Common Air Route Surveillance Radar) replaced the 1330/1350 radar in the summer of 2013. It started broadcasting on 08Aug13. It is a Westinghouse ARSR-4 radar. A similar radar is located at punta borinquen (more info)

Links to the new CARSR radar.

FAA carsr radar specs
09may14: faa  blanking. sidelobe height.
07may14: FAA and punta borinquen blanking.
14jan14: FAA radar increases center of blanking region by 1 degree.
01nov13: FAA radar blanking in ao direction.
Information on some "other" radars.
History


Links to the old FAA RADAR page (pre carsr). (top)

Old Faa radar specs.
Modeling the FAA radar total power spectrum (for pulsar observations).

08Aug13: FAA carsr radar starts broadcasting
may12: radar ipps jump by .3 %. Dip switches for timing probably set incorrectly.
may08: When the radar transmits at 1330 and 1350 MHz.
10apr07: FAA radar ipps jump by .3%.
30nov05: compression in the alfa receiver with the 100 MHz filter installed.
17oct05: location of 1350 FAA radar aliases in alfa.
01Aug05: compression, baseline variation with long recovery in alfa (from FAA radar).
27mar05: FAA 1350 MHz radar appears at 1380 MHz in alfa survey data.
08may05: aerostat compresses alfa when oh filter bank amps installed.
06oct04: Looking at the detected radar total power vs time
28sep04: az dependence of FAA radar compression in alfa receiver.
01Aug04: alfa signal compression by the FAA radar.
29apr03. detect 1290,1350MHz radars at 1 ms with lbw.  Show rotation drift and compression.
29apr03. IFLO (using lbw,lbn) compression by the 1330/1350 FAA radar .
13apr03. azimuth, za dependence of 1350,1290, and aerostat radars.
04apr03. Radar power levels in the downstairs IF (1290,1330/1350,punta salinas.
04oct01. Radar harmonics created at the 2nd IF.
Information on some "other" radars.
1997/1999 measured lband radar ipps (report)

history:


FAA  carsr-4  radar specs: (top)

The radar specs listed below were measured on 24apr13
 
 
transmitter Westinghouse arsr-4
rf frequencies
pulseName
F1
F1n
F2
F2n
freq[Mhz]
1257.59
1252.41
1349.59 1344.41
Pulse duration/sequence:

F1
off
F2
off
F2n
off
F1n
duration [usecs]
117
2
117
2
19
2
19
  
Total pulse length: 279usecs
ipp pulse sequence used
ipp seqNum
usecs
usecs usecs usecs usecs
1-5
2755.4 2755.4 2755.4 2755.4 2755.4
6-10
3150.7 3150.7 3150.7 3150.7 3150.7
11-15
3627.5 3627.5 3627.5 3627.5 3627.5

Period of 15 ipps: 47,620.9 usecs
bandwidth about 1 MHz
Rotation period 12 seconds
Sidelobes
Location pico del este (east of san juan).
distance to ao 57 Nmiles
Misc az beam width : probably about 1.4 degrees.

blanking wedge
az 272. to 276.4 (this looks like it is about 1.4 deg early).
the radar has .1 deg blanking accuracy.


Notes on the radar (top)



09may14: FAA  blanking

    Test data was taken on 14may14 to check the FAA radar blanking. The data looks at the blanking region as well as the sidelobe height over the 12 second rotation period. The data taking 07may14 only has  two 12 second rotations, so it couldn't differentiate between sidelobes and echoes from planes. The 09may14 data took 3 sets of 25 second data (2 rotations per set). The data sets were spaced by many minutes so plane echoes would not be stationary.

    Note: the engineers had been working on the antenna focus for the previous week or two. During this work, they shortened the blanking period for some tests. They promised that before they left, they would put the blanking back to 4.25 degrees.

The setup:

Processing:

The plots show the radar power vs rotation phase

Summary:

processing: x101/140509/faardr.pro

07may14: FAA,Punta borinquen blanking

    The FAA engineers were working on the punta del este radar (FAA radar) in early may14. They asked for us to check what the radar looked like now at AO.

The setup was:

   Processing:

The plots show the total power vs time for a 12 second rotation (.ps) (.pdf)

The 2nd set of plots shows the spectrum of the radar pulse (.ps) (.pdf)

Summary:

processing: x101/140507/faardr.pro

14jan14: FAA moves blanking sector by 1 degree

    The FAA carsr radar was blanking in the AO direction for radar azimuths 272. to 276.4. Data taken at AO showed that this was not centered on the AO direction.
Sometime in early jan14, the radar blanking sector was advanced by 1 degree to 273 to 277.4 degrees.
    On 14jan14 data was taken to measure if the new blanking sector was centered on the Arecibo direction.

The setup was:

   Processing:

The plots show the total power vs time for a 12 second rotation (.ps) (.pdf)
processing: x101/140114/faablanking.pro


01nov13: FAA blanks in ao direction.    (top)

Plots:

the total power vs time for a 12 second rotation (.ps) (.pdf)
show the spectra over the 3 Mhz (.ps) (.pdf)
the average daily spectrum for 25oct13 through 30oct13. (.ps) (.pdf)

    The new carsr FAA radar started blanking in the ao direction on 28oct13. The memo from the FAA said they were blanking azimuths 272.0 to 276.4.
Data was taken on 01nov13 to see how the blanking was performing.
    The setup was:
   Processing:
The first plots show the total power vs time for a 12 second rotation (.ps) (.pdf)
The second plots show the spectra over the 3 Mhz (.ps) (.pdf)
The hilltop monitor rfi system (spectrum analyzer with filters,amplifiers) shows how the blanking modifed the strength of the signal.
The plots show the average daily spectrum for 25oct13 through 30oct13. (.ps) (.pdf)

Summary:

processing:x101/131101/faardr.pro




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