Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A geometric delay model for Space VLBI   A relativistic delay model for space very long baseline interferometry
(hereafter SVLBI) observation of sources at infinite distance is derived. In
SVLBI, where one station is on a spacecraft, the orbiting station's maximum
speed in an elliptical Earth orbit is much bigger than the ground VLBI (here
after GVLBI), leading to a higher delay rate . The delay models inside the VLBI
correlators are usually expressed as fifth-order polynomials in time that good
for a limited time interval, which are evaluated by the correlator firmware and
track the interferometer delays over a limited time interval. The higher SVLBI
delay rate requires more accurate polynomial fitting and evalution, more
frequent model updates.

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The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: cs
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg