1、QUESTION ITU-R 234/1*Alternative techniques for radiolocation determination(2007)The ITU Radiocommunication Assembly,consideringa) that the current 2002 edition of the Spectrum Monitoring Handbook describes direction-finding as the only terrestrial technique to locate transmitters and harmful interf
2、erence;b) the trends in wireless communications towards higher frequencies, wider bandwidths, morecomplex modulation schemes and lower power levels are making radiolocation determination moreproblematic;c) that new alternative techniques and solutions for radiolocating transmitters (such as timediff
3、erence of arrival (TDOA) are now becoming available;d) that said techniques may offer advantages in accuracy and capability over direction findingin some situations,recognizinga) that the Radio Regulations provides definitions for radiodetermination, radiolocation andradio direction-finding;b) that
4、the current 2002 edition of the Spectrum Monitoring Handbook describes radiolocationof transmitters on Earth using time and frequency difference measurements from two GSO satellitesto locate interference to communication satellites;c) that Recommendation ITU-R SM.1598 describes alternative technique
5、s fordirection-finding and location specifically for time division multiple access and code divisionmultiple access signals;d) that Recommendation ITU-R SM.854-1 describes an alternative direction-finding andlocation determination technique of signals below 30 MHz using single site location (SSL),no
6、tinga) that Question ITU-R 28-3/1 proposed that methods to improve the accuracy ofdirection-finding and related digital signal processing be studied, but did not specifically addressusing TDOA or frequency difference of arrival (FDOA) methods for radiolocation,* In the year 2009, Radiocommunication
7、Study Group 1 extended the completion date of studies for thisQuestion.- 2 -decides that the following Question should be studied1 What alternative radiolocation technologies, such as TDOA and FDOA, are available andhow do they compare to DF in different scenarios for a broad range of emission types
8、?2 What are the considerations and requirements for the specification, deployment andoperation of such systems that effect geographical coverage, signal detection ability and locationdetermination accuracy?further decides1 that the results of the above studies should be included in an Addendum for the SpectrumMonitoring Handbook and/or Report(s);2 that the above study should be completed by 2011.Category: S2
