KEYWORDS: Satellites, Optical communications, Laser communications, Monte Carlo methods, Target acquisition, Satellite communications, Analytical research, Probability theory
Beaconless spatial acquisition contribute a lot to designing a more integrated and smaller laser communication terminal for optical inter-satellite communication. In this paper, we present an analytical model of beaconless spatial acquisition on the influence of vibration. Two kinds of scan methods are analyzed, which are single scan and multi-scan. The analytical expressions of the acquisition probability of single scan and the mean acquisition time of multi-scan are derived. Numerical simulation and Monte Carlo experiment are adopted. The simulation results show that the acquisition probability of single scan asymptotically approaches a constant value with the increase of vibration levels and becomes higher if the beam divergence is increased, but the scan beam gain decrease at the same time. So, the overall acquisition link margin should be sufficient when increasing the beam divergence. What’s more, the accurate location of the target satellite has a great influence on the acquisition probability. When it comes to the multi-scan mode, the shortest mean acquisition time is got at the vibration level of 40μrad. And, the increase of multi-scan times can overcome the influence of vibration efficiently. The conclusions above can give some guides to the design of beaconless spatial acquisition system.
The space-borne HgCdTe infrared detector is widely used in missile warning and interception because of its ability to detect the active tail flame of the missile. The performance of the infrared detector on satellite directly affects the missile's identification and threat assessment. In order to study the effect of temperature on the performance of satellite infrared detector, Noise-Equivalent Temperature Difference(NETD) of the HgCdTe detector is used as the performance reference, and the SBIRS near-earth orbit small satellite's cosmic environment is the analysis background. Radiant energy of the target is analyzed with distance changes. The performance of HgCdTe detector with temperature and distance changes was simulated by mathematics software MATLAB. Which is been used to simulate the change of Noise-Equivalent Temperature Difference due to the increased operating temperature and distance change of HgCdTe infrared detector. which provided calculations reference for the performance analysis of HgCdTe detectors on the satellite.
The reconstruction of laser reflection tomography target reconstruction is an important part of the laser reflection tomography radar target detection technology.But currently the acquisition of imaging data for laser reflection tomography mainly stays in the laboratory test acquisition phase, for the complete slave laser pulse. There are still gaps in the comprehensive simulation of the complete process of launch propagation, laser and target effects, acceptance of echo data, and target reconstruction. In this paper, based on the above problems, studying the problem of large computational complexity firstly when the sub-rays and the bins are successively intersected. Proposed a fast intersection algorithm based on the boundary of the laser beam, which improves the computational efficiency. Secondly, based on the spatio-temporal distribution characteristics of the lidar signal, the response function of the detection target to the signal is deduced, and the action process model of the two is established. Based on the above key technologies, a target reconstruction simulation system based on laser reflection tomography was constructed. Finally, according to the effect of different sampling intervals and different detection angles on the reconstructed image quality, a contrast simulation experiment was conducted. The image back-propagation algorithm was used to complete the reconstruction of the target 2D contour under different conditions.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.