This paper explores the pursuit-evasion game of two spacecrafts in low coplanar orbit under minute continuous
thrust. By using differential game theory, this study verifies terminal conditions confined by controlling, target set and
velocity and gives the linear game model of minimum error that is compared with nonlinear game model on sight
coordinate. The terminal conditions are fixed by constructing parameter equations set, which are obtained by the optimal
controlling strategy for both spacecraft. Within the linearized set of equations, there are variable parameters that are
associated with the linearization process. Using differential game of kind theory, this paper obtains the expression of the
barrier with the variable parameters to be established. According to extremum theory of the minimum error, the
parameters to be established are achieved. This paper gives the results of theoretical derivation and numerical simulation.
One of the most significant limitations of FBG sensors is their dual sensitivity to temperature and strain. Many
methods have reported to avoid this problem by using a tapered fiber grating for the strain measurement free from
temperature influence. But all of them are based on the measurement of the reflected power from the tapered fiber
grating (TFG). In fact, they have abandoned the major advantage that the measured information is encoded in light
wavelength instead of light intensity of FBG sensors, and the revolution of these sensors is begin to depend on the light
power fluctuation, connection loss and many other elements. All of these would enlarge the cost of the sensing system.
On the basis of the theory calculation and experiment, we demonstrate the feasibility to make a temperature-independent
strain sensor by measuring the bandwidth of the reflected light from the tapered fiber grating. In this paper, we also
present a novel demodulating method based on a scanning FBG. In the experiment, a PZT is used to make the reflected
wavelength of FBG scanned from short wavelength to long wavelength to measure the bandwidth of the reflected light
from TFG. From the experimental results, it could be seen that the influences of the light power fluctuation and
connection loss are eliminated thoroughly. This simple and low-cost sensor approach has a considerable potential,
particularly application for strain sensing in the smart structures.
KEYWORDS: Chemical elements, Process control, Telecommunications, Sun, Astronomical engineering, Mechanics, Systems modeling, Computer simulations, Rectum
The rendezvous problem was analyzed by the guidance method of qualitative differential game for space vehicle while the target is maneuvering, based upon the perturbation equation of orbital elements. By taking into account of fuel assumption for rendezvous control process under radial thrust, we introduced the performance index for quantitative differential game into Hamiltonian function to resolve the guidance problems for maneuvering space vehicle for orbit approaching, and gave a set of theoretical solution, barriers and an example for simulation. From mathematically simulation it is verified that there are the barriers in the method for the target maneuvering.
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