The ionosphere is an important component of near-Earth space that has a significant impact on communication and navigation. Furthermore, the total electron content (TEC) widely used parameter in plasma environment studies. A design digital beacon receiver system for automatically measuring TEC presented. Universal Software Radio Peripheral (USRP) hardware equipment with software-defined radio t...

India is planning to conduct its own Ka band propagation studies experiment in order to validate the existing ITU model and to develop a more accurate prediction model for its unique climate condition for guaranteed QoS. This experiment involves measurement of signal attenuation due to rain and development of appropriate mathematical propagation models. This requires a ground receiver to receiv...

OPS-SAT is the first publicly accessible Hardware/Software Innovation Lab in low Earth orbit. It was launched by European Space Agency on December 18, 2019, and open to academia industry, allowing new concepts be tested space with a range of interesting payloads. This article discusses implementation results an in-orbit demonstration (IOD) using software-defined radio payload together onboard R...

To reduce the sampling rate in global navigation satellite system (GNSS)-radio occultation receivers, it is essential to establish a suitable estimation of Doppler frequency from the received signal in the satellite onboard receiver. This receiver is usually located on low earth orbit satellite and receives GNSS satellites signal in the occultation situation. The occurred Doppler on the signal ...

Small-scale ionospheric plasma structures can cause scintillation in radio signals passing through the ionosphere. The relationship between scintillated signal and how structuring develops is complex. We model development of small-scale around an idealized polar cap patch observed by Resolute Bay Incoherent Scatter Radars (RISR) with Geospace Environment Model for Ion-Neutral Interactions (GEMI...

Satellite beacon is a signal which does not modulated and sent to ground in constant frequency with specific designed power. Beacon signals are used by station antenna users track the satellite easily. The operators generally choose at Ku Band band since this more resistant rain attenuation. system performance describe contribute of rainfall rate This paper includes comparison attenuation takin...

In this paper we present a user-centric position sensing system that is based on asynchronous, independent ultrasonic beacons. These stationary transmitter units are small, cheap to manufacture, and have power requirements low enough to run each from a small solar cell and a nearby light source. Each beacon is programmed to emit a short, 40 kHz ultrasonic signal with a unique transmission perio...

From January 2017 to December 2021, Office National d’Etudes et de Recherches Aérospatiales (ONERA) and Centre Spatiales (CNES) operated a beacon receiver able record the 20.1995 GHz signal of Amazonas-3 satellite at Guiana Space in Kourou, French Guiana. A rain gauge was also deployed on site collect rainfall rate measurements concurrently data. All years experiment, except 2019, had excellent...

In this article, a time-of-flight detection technique in the frequency domain is described for an ultrasonic local positioning system (LPS) based on encoded beacons. Beacon transmissions have been synchronized and become simultaneous by means of the DS-CDMA (direct-sequence code Division multiple access) technique. Every beacon has been associated to a 255-bit Kasami code. The detection of sign...