scholarly journals Protection of fixed service receivers from the interference produced by the non-geostationary satellites in a fixed satellite service network: a statistical interference analysis

2001 ◽  
Vol 20 (1) ◽  
pp. 15-27 ◽  
Author(s):  
Jos� Mauro P. Fortes ◽  
Jorge E. Amores Maldonado
Keyword(s):  
Service Network ◽  
Interference Analysis ◽  
Geostationary Satellites ◽  
Satellite Service

scholarly journals How Geostar Radiodetermination Technology Minimizes Interference to Radioastronomy

1991 ◽  
Vol 112 ◽  
pp. 201-204
Author(s):  
Martin A. Rothblatt
Keyword(s):  
Radio Astronomy ◽  
Federal Communications Commission ◽  
Time Difference ◽  
Frequency Allocation ◽  
Sharing Rule ◽  
Frequency Bands ◽  
Geostationary Satellites ◽  
The Earth ◽  
Satellite Service

Geostar Radiodetermination Satellite Service (RDSS) measures the position of vehicles on the earth using geostationary satellites and time-difference ranging techniques. One of the RDSS frequency bands overlaps with a radio astronomy frequency allocation. The Federal Communications Commission (FCC) mandated a unique spacetime frequency sharing rule to minimize interference.

scholarly journals Origin of Major L-Band Interference Received by the HALCA Space Radio Telescope

2001 ◽  
Vol 196 ◽  
pp. 335-340
Author(s):  
S. Yu. Lioubtchenko ◽  
M. V. Popov ◽  
H. Hirabayashi ◽  
H. Kobayashi
Keyword(s):  
Atlantic Ocean ◽  
Radio Telescope ◽  
Frequency Resolution ◽  
Frequency Range ◽  
Simple Criterion ◽  
Space Radio Telescope ◽  
Geostationary Satellites ◽  
L Band ◽  
Satellite Service ◽  
Tolerable Level

About 40 hours of observing data received by the space radio telescope HALCA at L-band (1.6 GHz) were analyzed in order to investigate interference received by the space radio telescope. Autocorrelation spectra for this study were specially prepared at the DRAO S2-correlator with a 7.8125 kHz frequency resolution in each 16 MHz channel. It was found that during 20% of the observing time the interfering signal was above the tolerable level of 1% of total receiver noise in a 16 MHz channel. The major source of interference is identified with uplink communication from ships to geostationary satellites in the International Maritime Satellite service (INMARSAT). The frequency range allocated for INMARSAT is 1636.5–1645.0 MHz. INMARSAT uses four geostationary satellites, two of which are located above the Atlantic Ocean where the strongest interference was observed. To avoid this interference it is recommended to move the HALCA observing frequency range from the currently used 1634–1666 MHz to 1645–1677 MHz. A simple criterion is proposed to predict harmful interference from INMARSAT. This criterion may be used in scheduling of future HALCA observations at L-band.

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