Orbcomm space segment for mobile satellite system (MSS)

Retrieval of Subsurface Soil Moisture and Vegetation Water Content from Multi-frequency SoOp-Reflectometry: Sensitivity Analysis

“…We utilized up to four different microwave frequencies and two types of receiver antenna polarizations in our simulations. The specific frequencies were selected because they are currently in use by operational satellite systems providing frequent coverage to most of the Earth: Orbcomm (137 MHz) [11], the US Navy MUOS (255 MHz, 370 MHz) [13], and GNSS (1575.42 MHz) [14]. All of these systems use right-hand circular polarization (RHCP).…”

“…Satellite transmissions are known to exist in three frequency ranges below 500 MHz. Orbcomm is a commercial communication system transmitting in multiple narrow-band channels between 137-138 MHz from a low Earth orbit (LEO) constellation of ∼30 satellites in ∼800 km, 45°orbits [11], [12]. The US Navy's Mobile User Objective System (MUOS) transmits on several narrow-band channels in a legacy band (240-270 MHz) and five (5) wideband code division multiple access (WCDMA) channels between 360-380 MHz from five (5) geosynchronous satellites [13].…”

Retrieval of Subsurface Soil Moisture and Vegetation Water Content from Multi-frequency SoOp-Reflectometry: Sensitivity Analysis

“…We utilized up to four different microwave frequencies and two types of receiver antenna polarizations in our simulations. The specific frequencies were selected because they are currently in use by operational satellite systems providing frequent coverage to most of the Earth: Orbcomm (137 MHz) [11], the US Navy MUOS (255 MHz, 370 MHz) [13], and GNSS (1575.42 MHz) [14]. All of these systems use right-hand circular polarization (RHCP).…”

“…Satellite transmissions are known to exist in three frequency ranges below 500 MHz. Orbcomm is a commercial communication system transmitting in multiple narrow-band channels between 137-138 MHz from a low Earth orbit (LEO) constellation of ∼30 satellites in ∼800 km, 45°orbits [11], [12]. The US Navy's Mobile User Objective System (MUOS) transmits on several narrow-band channels in a legacy band (240-270 MHz) and five (5) wideband code division multiple access (WCDMA) channels between 360-380 MHz from five (5) geosynchronous satellites [13].…”