Aerospace and Electronic Systems Magazine June 2017 - 58

Early History of Polish Radars
result, with the additional advantage of
high antenna gain (40 dB), range performance of 240 km was achieved on
a fighter aircraft, with detection probability of 0.9. The accuracy of height
measurement was 500 m at the range
of 150 km. The radar equipment was
deployed on three TATRA vehicles;
the antenna system was connected
with a waveguide to the transmitter/
receiver vehicle. The third vehicle carried the operating shelter with dual
channel signal processing equipment
and an R-H indicator.
The signal processing circuits employed in the NIDA were a copy of that
of the JAWOR-M2 warning radar, with
their conceptually good level and poor
hardware based on obsolete components. Some new digital designs were
applied mainly in the R-H display.
Like the JAWOR-M2, the NIDA also
underwent a thorough upgrade for its
export version. Over 60 NIDA height
finders were manufactured at RAWAR
over the period 1975-83.

NAREW LOW LEVEL RADAR
Low level detection radars make a
special class of military surveillance
Figure 17.
radar, intended for specifically diffiTop left. NIDA height finder in operating position. Top right. R-H indicator of the NIDA height finder
cult missions. The development of this
showing its maintainability. Bottom. NIDA height finder in cruising trim.
class of radar started at the beginning
of the 1970s. Eventually, they because
telescoping construction made of three sections, deployable by
RAWAR's specialty. The NAREW,
means of hydraulic cylinders and a system of steel cables. After
with its prototype built in 1975, was the first radar of this kind.
attaching the antenna on its top, the mast would be erected to
The radar equipment of the NAREW (again named after a
its vertical position and extended to its maximum height, then
Polish river), operating in S-band, was in a maximum degree
its stability secured with four guy ropes fixed to the ends of the
adapted from the earlier developed NIDA height finder. Even
widely stretched support beams of the base trailer. The process of
the antenna was based on NIDA's antenna design, though the reextending the mast and assembling the dual channel waveguide
quirements for a height finder antenna and a search radar antenna
line was quite complicated and that is why the mast was fitted
are generally very different. The 10 m sized reflector remained
with a manually operated lift. Level sensors were arranged in the
unchanged. The vertical pattern was modified by changing the
antenna drive capsule, indicating remotely the need for a correcfeed; an additional horn was added to form an extra beam, thus
tion of the particular trailer leg, so the antenna turntable could be
extending the elevation coverage. The two horns were supplied
accurately levelled. The antenna could be remotely tilted in the
with transmitter power split in halves, whereas a dual channel
range of a few degrees, so as to precisely adjust the radar coverreceiver was used, making good use of the readymade receiver
age to the particular site conditions. In spite of the deployment
system of the NIDA height finder. By these means the elevation
complexity, a well trained crew could perform the task in less
coverage was extended to some 4°, which later proved not to be
than 90 minutes.
fully satisfactory and seriously limited the use of the NAREW in
The high mast gave perfect conditions for low level coverair defence. Radiating elements for IFF action were also added at
age; a detection range of 43 km on a MIG-17 fighter flying at the
the antenna feed.
height of 50 m was reported in the acceptance tests. The maximum
The NAREW was composed of three vehicles: a transmit/redetection range was about 150 km. The electronic equipment of
ceive/operation vehicle, an antenna mast trailer and an antenna
the NAREW was very diversified in terms of the technology used.
transport trailer (Figure 18). The 25 m high antenna mast was a
58

IEEE A&E SYSTEMS MAGAZINE

JUNE 2017



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