Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surveillance of Space using Passive Radar and the Murchison Widefield
  Array   In this paper we build upon recent work in the radio astronomy community to
experimentally demonstrate the viability of passive radar for Space Situational
Awareness. Furthermore, we show that the six state parameters of objects in
orbit may be measured and used to perform orbit characterisation/estimation.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph