English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper presents a unique approach to the problem of calculating revisittime metrics for different satellite orbits, sensor geometries, andconstellation configurations with application to early lifecycle design andoptimisation processes for Earth observation missions. The developedsemi-analytical approach uses an elliptical projected footprint geometry toprovide an accuracy similar to that of industry standard numerical orbitsimulation software but with an efficiency of published analytical methods.Using the developed method, extensive plots of maximum revisit time arepresented for varying altitude, inclination, target latitudes, sensorcapabilities, and constellation configuration, providing valuable reference forEarth observation system design.

A Semi-Analytical Method for Calculating Revisit Time for Satellite Constellations with Discontinuous Coverage