Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intermediate frequency Upgrade design features of NASA D3R Weather Radar
  System   The NASA dual-frequency, dual-polarization, Doppler radar (D3R) is an
important ground validation tool for the global precipitation measurement (GPM)
mission dual-frequency precipitation radar (DPR). The D3R has undergone
extensive field trials starting in 2011 and continues to provide observations
that enhance our scientific knowledge. To further enhance its capabilities, the
Intermediate frequency (IF) electronics, digital receiver and waveform
generation subsystems have been upgraded. Due to the new, more flexible
architecture, this upgrade enables more research frontiers to be explored with
better performance. One of the primary motivations for this upgrade is to
enable enhanced radar sensitivity and increase range resolution to 30 meters.
In this work, the D3R system upgrade will be discussed with a focus on the key
upgrade design features to obtain better sensitivity and a flexible waveform
capability.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics