Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Drag-Tracking Guidance for Entry Vehicles Without Drag Rate Measurement   A robust entry guidance law without drag rate measurement is designed for
drag-tracking in this paper. The bank angle is regarded as the control
variable. First, a state feedback guidance law (bank angle magnitude) that
requires the drag and its rate as feedback information is designed to make the
drag-tracking error be input-to-state stable (ISS) with respect to
uncertainties. Then a high gain observer is utilized to estimate the drag rate
which is difficult for a vehicle to measure accurately in practice. Stability
analysis as well as simulation results show the efficiency of the presented
approach.

25
The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: math
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat