Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correction of IQ mismatch for a particle tracking radar   For a better understanding of granular flow problems such as silo blockage,
avalanche triggering, mixing and segregation, it is essential to have a
`microscopic' view of individual particles. In order to cope with the
difficulty arising from the opacity of granular materials, such as sands,
powders and grains, a small scale bi-static radar system operating at $10$\,GHz
(X-band) was recently introduced to trace a sub-centimeter particle in three
dimensions. Similar to a moving target indicator radar, the relative movement
of the tracer with respect to each of the three receiving antennae is obtained
via comparing the phase shift of the electromagnetic wave traveling through the
target area with an IQ-Mixer. From the azimuth and tilt angles of the receiving
antennae obtained in the calibration, the target trajectory in a
three-dimensional Cartesian system is reconstructed. Using a free-falling
sphere as a test case, we discuss the accuracy of this radar system and
possible ways to enhance it by IQ mismatch corrections.

19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an