Survivability performance evaluation for satellite communication network based on Walker Constellation

Abstract

Satellite communication plays a more and more important role in civilian communication and military communication with the explosive growth of requirements on information. It also means that satellite communication network must have a high survivability in order to provide satisfying services to its users. Network survivability reflects the ability of a network to continue to function during and after failures. Now, many papers give an analysis to network survivability for terrestrial networks and the papers studying network survivability for satellite network is few. This paper discusses the network survivability for satellite network based on Walker Constellation. Firstly, we analyze the features of topology of Walker constellation and the analysis method based on time segments is introduced. And then, the new survivability measure for satellite network is defined based on topology structure and traffic capacity. At last, survivability function for satellite network is introduced and some quantities of interest are gotten from the survivability function. Example of survivability performance evaluation of Iridium satellite network is presented.

Empirical Validation of Design Principles for Survivable System Architecture

“…This research and related analyses [26] have concluded that the Iridium communications service is robust to node removal. For example, even with 36 of the 66 spacecraft removed, the system is still functional (i.e., packet delays do not exceed 178 milliseconds, well within an emergency value threshold of 400 ft) X sustains 9-g turns X X X two-tone grey camouflage (standard) X tail and wing proximity for enhanced maneuverability X X blended wing fuselage to reduce transonic drag X X X situational awareness data link X autonomous precision targeting (if necessary) X X X X bubble canopy for enhanced visibility X cockpit compatibility with night vision goggles X LANTIRN navigation pod for nighttime operations X modular avionics X X 30 degree seat back angle to increase g tolerance X ACES II ejection seat X buried fuel lines X X fuel inerting system X X X 29,000-pound engine thrust class X X thrust-to-weight ratio >1 X X fly-by-wire system for enhanced responsiveness X negative static stability for enhanced maneuverability X electronic-hydraulic stability augmentation system X fault tolerant control surfaces (aerodynamic redundancy) X X X X ground collision avoidance w/dissimilar-source validation X X X override feature of computer's alpha-limiter X redundant electrical generating and distribution equipment X four sealed-cell batteries for fly-by-wire system X two separate and independent hydraulic systems X X X M61 20-mm six-barrel rotary cannon X X X AIM-9 infrared, beyond-visual range a i r -t o -a i r m i s s i l e s X X X X rocket pods X X X anti-ship missiles X X X AGM-88 anti-radiation missiles X X X standoff precision strike weapo n s To test the baseline set of design principles, survivability features were gathered on the Iridium architecture from the literature [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. In tracing Iridium design features to the design principles, the unit of analysis is the overall communications network.…”

Interlink and coverage analysis for small satellite constellations

“…ISLs act as lines joining the satellites (forming a chain) but, in order to obtain a continuous and nondegraded signal transmission, specific constraints of distance and relative velocity must be satisfied. [12][13][14][15] The analysis of such constraints has made it possible to select particular constellations that have been evaluated in terms of performance and costs. The results have been obtained with the support of the Satellite Tool Kit (STK) software (www.agi.com).…”