Abstract Standby mode is the in which space advanced technology demonstration satellite (SATech) stays for a long time when all payloads are not working. This ensures energy supply of on one hand and long-term effectiveness satellite’s star tracker quaternion other hand. Firstly, target guidance law standby designed. Secondly, installation position designed according to characteristics law. Thi...

Recently, orthogonal time frequency space modulation with index (OTFS-IM) has been proposed to improve the bit-error-rate (BER) performance of OTFS system. However, only some grids in OTFS-IM system are activated, resulting low spectral efficiency (SE). In order solve this problem, a new scheme called multiple-mode (MM-OTFS-IM) is paper. scheme, all activated transmit bits. Each grid subblock a...

Recently, the number of space objects around Earth has increased rapidly, necessitating systematic risk management. This paper proposes a dual-mode framework for assessing collision between objects. The proposed consists microscopic and macroscopic modes. former focuses on one-to-one events, latter assesses overall inside cell located in space. Two assessment case studies using two modes demons...

While negativity in phase space is a well-known signature of nonclassicality, wide variety nonclassical states require their characterization beyond negativity. We establish framework nonclassicality that addresses comprehensively with direct experimental evidence. This includes the phase-space distribution as special case and further analyzes quantum positive distributions effectively. prove i...