In this study, a new spiral dual-band antenna integrated with an optical system for a small CubeSat spacecraft was proposed. It is challenging to design an antenna with a limited space on a CubeSat platform. To improve the space utilization, an antenna was designed based on the concept of not occupying the sides of the CubeSat. A feature of the proposed antenna system is its compactness, dual-band operation in the L- and S-bands, and possibility of integration with spacecraft cameras. As a result of the study, reflection coefficients of −18 dB and −23 dB and gain of 6.8 dBi and 7.4 dBi, respectively, were achieved at resonant frequencies of 1.7 GHz and 2.45 GHz. The conical shape of the spiral antenna allows the optical system to increase the coverage area, and a simple deployment system with feedback ensures the mission safety. These properties make the proposed antenna suitable for CubeSat systems.

This paper provides a comprehensive review of the existing approaches to ensuring high-precision and reliable GNSS positioning. The purpose of this review is to examine modern approaches to mitigating the main factors affecting GNSS receiver accuracy, including atmospheric delays, ephemeris and clock errors, multipath, and receiver noise, and to highlight the key open challenges in high-precision positioning and error correction. The article presents various error correction techniques and provides their analysis. It presents modern architectural solutions for GNSS receivers aimed at providing high-precision and reliable positioning (conventional, software-defined, multi-frequency and multi-constellation, cloud/edge, integrated GNSS/INS/LiDAR, and integrated GNSS/IoT) and their comparative analysis. The resulting overview will be useful for further research in the field of high-precision navigation.

This research explores advanced algorithms and sensor fusion techniques to enhance star sensor precision, optimizing Global Navigation Satellite System (GNSS) accuracy in navigation systems.

The integrated configuration provides the fastest response time and orientation of the camera with minimal amplitudes, and also results in the lowest power consumption.

CuO/porous silicon heterostructure enables a room-temperature methane sensor, offering high sensitivity and reliability for enhanced industrial safety