With the explosive growth of network communication technologies, nowadays global positioning system (GPS) successfully provides the worldwide navigation service for militaries and civilians. Sailors, aviators, and car drivers rely heavily on the accuracy of navigation and position estimation provided by GPS. Instead of using conventional radio frequency (RF) crosslinks, the reliability and efficiency of information transmissions can be significantly enhanced with the aid of optical crosslinks between satellites. In this paper, we develop a toolchain-based hybrid implementation (TBHI) by designing and integrating multiple platforms and software to evaluate the performance of the next-generation global position system (GPS) with potential configuration of optical transmission crosslinks between satellites. A distributed, multi-simulation tool chain is developed in both the front-end and back-end to conduct a real-time evaluation of optical crosslinks. A comprehensive assessment is provided for the receiving or transmission chain, along with traffic loading evaluation of satellite crosslinks from both physical layer and network layer emulation. To further evaluate the effectiveness of our developed TBHI, we investigate five base-line traffic models which can cover most applications in the satellite communication, including single-time transmission, periodical transmission, regular data transmission with randomness, and small data transmission. For each model, we specify a group of parameters that can determine the statistical distribution used to generate the traffic loading. Experiments using real-world traffic traces are used to evaluate the effectiveness of our proposed TBHI framework. Our simulation validates that it can effectively and accurately visualize the GPS satellite communications.
In the current global positioning system (GPS), the reliability of information transmissions can be enhanced with the aid of inter-satellite links (ISLs) or crosslinks between satellites. Instead of only using conventional radio frequency (RF) crosslinks, the laser crosslinks provide an option to significantly increase the data throughput. The connectivity and robustness of ISL are needed for analysis, especially for GPS constellations with laser crosslinks. In this paper, we first propose a hybrid GPS communication architecture in which uplinks and downlinks are established via RF signals and crosslinks are established via laser links. Then, we design an optical crosslink assignment criteria considering the practical optical communication factors such as optical line- of-sight (LOS) range, link distance, and angular velocity, etc. After that, to further improve the rationality of establishing crosslinks, a topology control algorithm is formulated to optimize GPS crosslink networks at both physical and network layers. The RF transmission features for uplink and downlink and optical transmission features for crosslinks are taken into account as constraints for the optimization problem. Finally, the proposed link establishment criteria are implemented for GPS communication with optical crosslinks. The designs of this paper provide a potential crosslink establishment and topology control algorithm for the next generation GPS.
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.