The dual-population differential evolution (DDE) algorithm is an optimization technique that simultaneously maintains two populations to balance global and local search. It has been demonstrated outperform single-population algorithms. However, existing improvements algorithms often overlook the importance of selecting appropriate mutation selection operators enhance performance. In this paper, we propose a (DPDE) based on hierarchical strategy. We divided population into elite normal...

We conducted research into the visible light detection of conical space targets and proposed a method to determine caliber space-based system. constructed three-dimensional target radiation transfer model analyzed effect phase angle between solar incident direction, detector’s bore sight inclination on intensity received by detector. Finally, we obtained threshold which can meet requirements system with signal-to-noise ratio as evaluation standard, took SBV sensor an example verify that...

In this study, we developed a numerical model of the coupled modulation transfer function (coupled-MTF) based on discrete sampling system from perspective optical imaging quality evaluation for two-dimensional characteristics hexagonally aligned fiber-optic bundles and CCD image elements. The results show that when spatial frequency input target signal deviates Nyquist by 1%, an increase in number fibers leads to faster convergence oscillation coupled-MTF, coupled-MTF converges stable value...

A systematic study of global properties superheavy nuclei in the framework Liquid Drop Model and Strutinsky shell correction method is performed. The evolution equilibrium deformations, TRS graphs α-decay energies are calculated using model. analysis covers a wide range even-even from Z = 102 to 122. Magic numbers their observable influence occurring this region have been investigated. Shell closures appear at proton number 114 neutron N 184.

Freeform off-axis reflective systems are significantly more difficult to align and assemble owing their asymmetric surface shapes system structures. In this study, a freeform design method with low coupling position error sensitivity (FCPESM) was proposed. First, we established mathematical model of when it perturbed by errors used the clustering-microelement establish evaluation function. The function then applied process three-mirror optical system. results showed that FCPESM can relax...

The monocentric camera based on fiber relay imaging offers benefits of light weight, compact size envelope, vast field view, and high resolution, which can fully fulfill the index requirements space-based surveillance systems. However, optic plate's (FOP) defects will result in loss data, FOP's discrete structural features exacerbate imaging's non-uniformity. A global defect detection approach manual threshold segmentation saturated frames is suggested to detect FOP features. method's...

We propose a method for obtaining the centroid locating accuracy (CLA) of monocentric imager with fiber optic plate (FOP) as relay image transmission element in order to reduce loss CLA due addition FOP. constructed two-stage coupling model spherical focal surface sensor. By analyzing influences FOP parameters, including fill factor and diameter, in-plane displacements, rotation translation on CLA, lowest that can withstand caused by was reduced 20%.

We report a method for determining the field of view (FOV) dawn–dusk sun-synchronous orbit satellite based on an improved observation mode. The target trajectory distribution model in geosynchronous (GEO) is established, natural rendezvous mode improved, and determined. A scheme thresholds cross-orbit (COFOV) along-orbit (AOFOV) was developed. result shows that coverage can reach more than 95% when used to observe GEO target. When revisit period one day, threshold COFOV 15°, AOFOV 12°.