Презентация на тему Brief on spectrum management issues

FCC
(Independent Agency)

- Business
- State &

Local
- Entertainment
- Commercial
- Private

PNT solution using signals from different GNSS systems
No additional

receiver cost or complexity
No degradation in performance

Interoperable = Better Together Than Separate

MHz
1598.0625-
1605.375 MHz
GLONASS
GALILEO
L5
1176.45 MHz
L2
1227.6 MHz
LEX
1278.75 MHz
L1
1575.42 MHz
QZSS
GNSS Frequency Bands &

Signals

Possible future
signal

Possible future
signal

SBAS

SBAS

IRNSS

Beidou/Compass & IRNSS
In S-band

the ability of space-based positioning, navigation, and timing services

to be used separately or together without interfering with each individual service or signal.
Radiofrequency compatibility should involve thorough consideration of detailed technical factors, including effects on receiver noise floor and cross-correlation between interfering and desired signals. The International Telecommunications Union (ITU) provides the framework for discussions on radiofrequency compatibility.
Compatibility should also involve spectral separation between each system’s authorized service signals and other systems’ signals.
Any additional solutions to improve compatibility are encouraged

interfere with use of other signals
Requires thorough consideration of

detailed technical factors, including
Effects on receiver noise floor
Crosscorrelation between interfering and desired signals
International Telecommunication Union (ITU) provides framework
Details are best worked bilaterally between providers

the ability of open global and regional satellite navigation

and timing services to be used together to provide better capabilities at the user level than would be achieved by relying solely on one service or signal.
• Ideal interoperability allows navigation with signals from at least four different systems with no additional receiver cost or complexity.
• Common center frequencies are essential to interoperability, and commonality of other signal characteristics is desirable.
• Multiple constellations broadcasting interoperable open signals will result in improved observed geometry, increasing end user accuracy everywhere and improving service availability in environments where satellite visibility is often obscured.
• Geodetic reference frames and system time standards should also be considered.
• Any additional solutions to improve interoperability are encouraged.

Web Site
http://www.ntia.doc.gov
NTIA Manual of Regulations & Procedures for Federal

Radio Frequency Management available for download in Adobe Acrobat Portable Document Format (PDF) http://www.ntia.doc.gov/osmhome/redbook/redbook.html
Chapter 4. Allocations, Allotments and Plans
Chapter 5. Spectrum Standards
Chapter 10. Procedures for the Review of Telecommunication Systems for Frequency Availability and Electromagnetic Compatibility (EMC)
ITU Web Site
http://www.itu.int
Overview of the ITU Radio Regulations http://www.itu.int/sns/radreg.html
FCC Web Site
http://www.fcc.gov/
FCC's Table of Frequency Allocations http://www.fcc.gov/oet/spectrum/table/fcctable.pdf

? Improves:
Satellite coverage ? navigate where could not before
Dilution

of Precision ? accuracy is better everywhere
Eliminates DOP holes (with open sky)‏
RAIM* ? integrity checked everywhere, all the time
Eliminates RAIM holes (with open sky)‏
Phase ambiguity resolution for survey and machine control applications

Geometry

* Receiver Autonomous Integrity Monitoring

Antenna Polarization
Common Signal Spectrum
Identical receiver time delay with common

spectrum
Same coherent integration period for acquisition
Usually related to symbol rate
Different symbol rates may require separate search correlators for acquiring signals

Essential (cost driver)

Desirable (ASIC gate count)

Important (no time bias or filter issues)