Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A State Space Technique for Wildlife Position Estimation Using
  Non-Simultaneous Signal Strength Measurements   A novel state-space technique is presented to estimate the location and
airborne movements of VHF tagged wildlife individuals with fixed VHF arrays.
The approach combines a movement model (Ornstein- Uhlenbeck random process in
the transverse (horizontal) plane and a Cox- Ingersoll-Ross process in the
vertical direction) to ensure biologically-consistent trajectories in
three-dimensions, and an observation model to account for the effect of range,
altitude and bearing angle on the received signal strength. The observation
model of received signals accounts for low-end saturation from receiver noise,
high-end saturation from receiver non-linearities as well as a wireless
multipath phenomena, which modulates the received signal according to range,
the altitude and radiation characteristics of the Yagi array. A pattern
function for the Yagi array is synthesized that facilitates linearization of
the received signals and subsequent application of Kalman filtering.
  We first validate the model using a simulated trajectory and then estimate
the space-time trajectory of a migrating VHF-tagged shorebird, which was
tracked with a regional automated radio telemetry network. The algorithm
accurately predicted the average movement trajectory given the system
parameters and the initial conditions (average error $<$ 1 km). The modeled
shorebird track represents a first estimate in three-dimensional (3D) of a
radio tagged bird using a fixed telemetry array, and was qualitatively
reasonable, but exhibited some sensitivity in the vertical plane and to initial
conditions.

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The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org