|
|
|
|
|
1.4 GHz Band
|
The unpaired 1390-1392 MHz band and the paired 1392-1395/1432-1435 MHz bands comprise the FCC's "1.4 GHz band."
TerreStar acquired the 1.4 GHz band licenses, but after several years of challenges, it declared bankruptcy and emerged as MidWave, which plans to use the 1.4 GHz band for a nationwide 5G deployment in the U.S. and its territories.
The bands have incumbent operations which will continue. According to the FCC:
There are several government operations that will continue to operate in these bands:
1390-1392 MHz
-Radio astronomy observations may be assigned in the 1350-1400 MHz band on an unprotected basis at the 16 radio astronomy observatories identified in the table of Footnote US311 set forth in 47 C.F.R. § 2.106.
-In the 1390-1400 MHz band, government operations authorized as of March 22, 1995, at the 17 sites identified in the table of Footnote US351 set forth in 47 C.F.R. § 2.106 will continue to operate on a fully protected basis until January 1, 2009. All other government operations, except for medical telemetry (1395-1400 MHz), will operate on a non-interference basis to authorized non-Government operations and shall not hinder implementation of any non-Government operations.
1392-1395 MHz and 1432-1435 MHz
-Radio astronomy observations may be assigned in the 1350-1400 MHz band on an unprotected basis at the 16 radio astronomy observatories identified in the table of Footnote US311 set forth in 47 C.F.R. § 2.106.
-In the 1390-1400 MHz band, government operations authorized as of March 22, 1995, at the 17 sites identified in the table of Footnote US351 set forth in 47 C.F.R. § 2.106 will continue to operate on a fully protected basis until January 1, 2009. All other government operations, except for medical telemetry (1395-1400 MHz), will operate on a non-interference basis to authorized non-Government operations and shall not hinder implementation of any non-Government operations.
-In the 1432-1435 MHz band, government stations in the fixed and mobile services may operate indefinitely on a primary basis at the 23 sites listed in the table of Footnote US361 set forth in 47 C.F.R. § 2.106. All other Government stations in the fixed and mobile services shall operate on a primary basis until re-accommodated in accordance with the National Defense Authorization Act of 1999.
|
Frequency Bands |
Band | Use | Service | Table |
1390 - 1392 MHz | Unpaired component of the 1.4 GHz band | Mobile | N |
Paired Frequency Bands |
Paired Bands | Use | Service | Table |
1392 - 1395 MHz | Paired component of the 1.4 GHz band | Mobile | N |
1432 - 1435 MHz | Paired component of the 1.4 GHz band | Mobile | N |
Display this entry in a page by itself
Edit
|
|
|
|
Soil Moisture Active Passive (SMAP) Satellite
|
The Soil Moisture Active Passive (SMAP) satellite is a planned NASA satellite mission to monitor soil moisture around the globe. It is planned for launch in 2014.
As its name implies, the Soil Moisture Active Passive (SMAP) satellite uses active and passive radio systems to measure soil moisture around the globe. The spacecraft is in a sun-syncronous orbit that passes overhead of its target areas around 6 AM and 6 PM, approximately every 3 days at the equator and every 2 days at high latitudes.
SMAP's sensors can determine soil moisture down to a depth of approximately 5-10 cm. The active radar provides approximately 3 km resolution on the ground, using a 6 m antenna and measuring reflections in HH, VV, and HV polarization modes. The radar works in frequency hopping mode to avoid interference to and from aviation radars that operate in the same band. The instantaneous signal from the radar consists of two separate signals each of ~1.4 MHz bandwidth, separated by 5 MHz. It pulses every ~354 microseconds, for a duration of ~10-20 microseconds per pulse. The radar transmit power (not EIRP) is a few hundred watts.
SMAP will operate in a circular orbit of 670 km altitude. The ground footprint of the radar is approximately 1000 km. Resolution of the radar in low-resolution mode is approximately 40 km, and in high-resolution mode the resolution is approximately 3 km.
Soil moisture data can be used for improving numerical weather prediction, including seasonal climate prediction and rainfall prediction.
Like the European SMOS satellite, it is anticipated that SMAP's passive sensor will be subject to illegal RFI in the passive-only 1400-1427 MHz band.
|
Frequency Bands |
Band | Use | Service | Table |
1200 - 1300 MHz | SMAP active radar | Earth Exploration-satellite | F |
1400 - 1427 MHz | SMAP passive radiometer | Earth Exploration-satellite | F |
External Links:
Display this entry in a page by itself
Edit
|
|
|
|
|