960-1215

May be Possible. Needs consultation with aeronautical interests.

This 255 MHz bandwidth is allocated on a worldwide basis to Aeronautical Radionavigation services. A wide number of civil and military aeronautical systems employ this band including DME, TACAN, JTIDS, TCAS, Mode-S, IFF, etc. However, the use of some of these systems may become obsolete because of widespread employment of GPS. Thus, bandwidth may become available in the future. Moreover, since a C/A code GPS-L₄ would only need a few MHz of bandwidth, it would seem in the self-interest of the aeronautical community to make such a small amount of spectrum available.

1215-1240

Good Possibility. Needs further study, including GPS interaction and interference effects of radar

Worldwide allocation to Radiolocation and Radionavigation-Satellite services The GPS-L₂ signal is located in this band at 1227.6 MHz. Since the P-code occupies ±10 MHz, the bands 1215-1217.6 MHz or 1237.6-1240 MHz may be available for the GPS-L₄ signal. If 1 or 2 MHz of additional spectrum is needed, it may be available in one of the adjacent bands. However, the transmission and reception of two adjacent frequency signals (L₂ and L₄) often gives rise to intermodulation interference problems. Further study is obviously needed.

In addition, it may be possible to operate a C/A-code signal and a P-code signal co-frequency at 1227.6 MHz (L₂), as it is done at 1575.42 MHz (GPS-L₁).

In the U.S., the Radiolocation services are for U.S. government long-range air surveillance radars. Worldwide usage needs investigation.

Use of this band has the advantage of not requiring an allocation change via the ITU.

1240-1260

Good Possibility. Needs detailed study including effect of radar on GPS signal.

Worldwide allocations to Radiolocation and Radionavigation-Satellite. The latter covers the L₂ channel for Glonass. agreed to move Glonass frequencies down from their current band over the next several years. Thus, it is probable that several MHz at the high end of this band will be cleared out and could be used for GPS L₄. However, the use of the co-frequency Radiolocation allocation needs further study to verify sharing potential. In the U.S. this band is assigned to DOD for radars and use may be extensive. However, it is encouraging to note that the band has been acceptable for Glonass L₂. An advantage of this band for GPS L₄ is that no new ITU allocation would be necessary. NASA uses this band on a secondary basis for earth-exploration satellites.

However, the Russian gov't has

1260-1300

Possible. Needs study, including radar effects.

Worldwide allocation to Radiolocation (radar). In the U.S., this band is assigned to DOD. Secondary amateur satellite service operates Earth-space in this band and could cause localized interference that would be difficult to uncover.

1300-1350

Low Possibility. Needs study, including radar effects.

This band is allocated worldwide to Aeronautical Radionavigation and is used for surveillance radars in air traffic control (ATC) in the U.S. Transponders on the aircraft are used for identification. It is believed this same use is worldwide. In U.S. and elsewhere, ATC surveillance radars may be partially replaced by Mode S systems in the future. Thus, in the long term it may be possible that several MHz of this band could be set aside for GPS L₄.

There is a footnote asking administrations to protect the band 1330-1400 MHz for Radioastronomy. Space station emissions are noted to be particularly harmful to these observations.

1350-1400

Questionable. Would need much study.

The band has a worldwide allocation for Radiolocation. The band is used for long range surveillance radars by the DOD and for air traffic control. There is also a Radioastronomy footnote, noted above (RR 718), and the fact that passive space research is conducted in 13701400 MHz (RR 720) would make this a difficult band for NAS to endorse. The U.S.G. is turning control of 13901400 MHz over to non-government use but notes problem of Radioastronomy. Also, the fixed and mobile allocations in Region 1 are potential sources of harmful interference to GPS-L₄. Note that GPS L₃ at 1381 MHz is in this band but its use is subject to restrictions.

1400-1427

Not Feasible

Primary allocations to Radioastronomy and Space Research (passive) make this band not feasible.

1427-1429

1429-1452

Probably not feasible Needs study.

Mobile and Fixed services are allocated worldwide in these bands. One of the ground rules established in this study is to not attempt to place a GPS receiver on a mobile vehicle where a co-frequency transmitter was possible. However, the U.S.G. will turn over control of 1427-1432 MHz to non-government use in about five years, although some government use will be grandfathered! Note that the adjacent band is allocated on a Primary basis to Radioastronomy.

1452-1492

Not Feasible

The current application of this band to the Broadcasting, Broadcasting-Satellite and Mobile services make this band not feasible for GPS-L₄.

1492-1525

Not Feasible

The band is allocated to Mobile services worldwide and to Mobile Satellite (space-Earth) in Region 2. Either allocation would rule out its use for GPS-L₄.

1525-1530 1530-1533

1533-1535

1535-1544

1544-1545

Not Feasible

Worldwide allocation to Mobile Satellite (space-Earth). These satellite transmissions would cause unacceptable interference to an L₄ GPS receiver in the band.

1545-1555

1555-1559

1559-1610

Not Feasible

Band used for GPS and Glonass L₁ signals. Band edge use would not be acceptable.

1610-1610.6

Not Feasible

Worldwide allocation to Mobile Satellite (Earth-space). Uplink transmissions from vehicle to satellite would cause unacceptable interference to GPS receiver on same or nearby vehicle.

1610.6-1613.8

1613.8-1626.5

1626.5-1631.5

1631.5-1634.5

1634.5-1645.5

1645.5-1646.5

1646.5-1656.5

1656.5-1660

1660-1660.5

1660.5-1668.4

Not Feasible

Worldwide allocations to Radioastronomy.

1668.4-1670

1670-1675

Not Feasible

Worldwide allocations to Metaids, Mobile, etc. would cause unacceptable interference to GPS-L₄. In addition, a new air passenger telephone service (ground-to-air) is planned for this band. The U.S.G. is turning over control of 1670-1675 MHz to non-government use and thereby not allowing radiosonde operations in the band. However, the U.S.G. points out the sensitivity of Radioastronomy in the adjacent band.

1675-1690 1690-1700

Not Feasible

Worldwide allocation to Metaids (radiosondes), Metsats (space-Earth) and. Mobile services make use of this band not feasible in the near term. Moreover, the band is allocated to mobile satellite (Earth-space) in Region 2 and there are indications the allocation will be extended worldwide.

1700-1710

Not Feasible

Same as above, except for omission of Metaid allocation.

1710-1930

Good possibility. Study needed.

This 220 MHz band has worldwide allocations for Fixed and Mobile services. However, band usage is in a state of flux. The band 1800-1805 MHz is set aside for air-to-ground link of a new air passenger telephone service. The band 1885-2025 is set aside for a next generation worldwide public land mobile telephone system and the FCC has extended the band down to 1850 MHz for such use in the U.S. The band 1761-1842 MHz is used for a number of USG space services. The U.S. government has announced that it intends to turn over primary use of 1710-1755 MHz to non-government service in 2004, although some U.S.G. use will be grandfathered. 1718.8-1722.2 MHz is allocated to radio astronomy on a secondary basis. The lower end of this band looks promising for GPS L4, although out-of-band emissions of LEO weather satellites need investigation.

890 - 942

890 - 902

890 - 942

FIXED

FIXED

FIXED

MOBILE except

MOBILE except

MOBILE

aeronautical mobile

aeronautical mobile

BROADCASTING

BROADCASTING 703

Radiolocation

Radiolocation

Radiolocation

700A 704A 705

902 - 928

FIXED

Amateur

Mobile except

aeronautical mobile

Radiolocation

705 707 707A

928 - 942

FIXED

MOBILE except

aeronautical mobile

Radiolocation

704

705

706

942 - 960

942 - 960

942 - 960

FIXED

FIXED

FIXED

MOBILE except

MOBILE

MOBILE

aeronautical mobile

BROADCASTING

BROADCASTING 703

704

701

960 - 1 215

AERONAUTICAL RADIONAVIGATION

709

1 215 - 1240

RADIOLOCATION

RADIONAVIGATION-SATELLITE

(space-to-Earth) 710

711 712 712A 713

1240 - 126

1260 - 1300

1300 - 1350

1350 - 1400

FIXED

MOBILE

RADIOLOCATION

718 719 720

1400 - 1427

1427 - 1429

1429 - 1452

FIXED

MOBILE except aeronautical mobile

722 723B

1452 - 1492

1452 - 1492

FIXED

FIXED

MOBILE except

MOBILE 723

aeronautical mobile

BROADCASTING 722A 722B

BROADCASTING 722A

BROADCASTING-SATELLITE 722A 722B

722B

BROADCASTING-

SATELLITE 722A 722B

722 723B

722 722C

1492 - 1525

1492 - 1525

1492 - 1525

FIXED

FIXED

FIXED

MOBILE except

MOBILE 723

MOBILE 723

aeronautical mobile

MOBILE-SATELLITE

(space-to-Earth)

722 723B

722 722C 723C

722

1525 - 1530

1525 - 1530

1525 - 1530

SPACE OPERATION

SPACE OPERATION

SPACE OPERATION

(space-to-Earth)

(space-to-Earth)

(space-to-Earth)

FIXED

MOBILE-SATELLITE

FIXED

MARITIME

(space-to-Earth)

MOBILE-SATELLITE

MOBILE-SATELLITE

Earth Exploration-Satellite

(space-to-Earth)

(space-to-Earth)

Fixed

Earth Exploration-Satellite

Earth Exploration-Satellite

Mobile 723

Mobile 723 724

Land Mobile-Satellite

(space-to-Earth) 726B

Mobile except aeronautical

mobile 724

22 723B 725 726A

26D

722 723A 726A 726D

722 726A 726D

1530 - 1533

1530 - 1533

SPACE OPERATION

SPACE OPERATION (space-to-Earth)

(space-to-Earth)

MARITIME MOBILE-SATELLITE (space-to-Earth)

MARITIME MOBILE- SATELLITE

LAND MOBILE-SATELLITE

(space-to-Earth)

(space-to-Earth)

LAND MOBILE-

Earth Exploration-Satellite

SATELLITE

Fixed

(space-to-Earth)

Mobile 723

Earth Exploration-Satellite

Fixed

Mobile except

aeronautical mobile

722 723B 726A 726D

722 726A 726C 726D

1533 - 1535

1533- 1535

SPACE OPERATION

(space-to-Earth)

SPACE OPERATION (space-to-Earth)

MARITIME MOBILE-SATELLITE

MARITIME MOBILE- SATELLITE

(space-to-Earth)

(space-to-Earth)

Earth Exploration-Satellite

Earth Exploration-Satellite

Fixed

Fixed

Mobile except

Mobile 723

aeronautical mobile

Land Mobile-Satellite (space-to-Earth) 726B

Land Mobile-Satellite

(space-to-Earth) 726B

722 723B 726A 726D

722 726A 726C 726D

1535 - 1544

MARITIME MOBILE-SATELLITE (space-to-Earth)

Land Mobile-Satellite (space-to-Earth) 726B

722 726A 726C 726D 727

1544 - 1545

MOBILE-SATELLITE (space-to-Earth)

722 726D 727 727A

1545 - 1555

AERONAUTICAL MOBILE-SATELLITE (R)

(space-to-Earth)

722 726A 726D 727 729 729A 730

1555 - 1559

LAND MOBILE-SATELLITE (space-to-Earth)

722 726A 726D 727 730 730A 730B 730C

1559- 1610

AERONAUTICAL RADIONAVIGATION

RADIONAVIGATION-SATELLITE (space-to-Earth)

722 727 730 731

1610 - 1610.6

1610 - 1610.6

1610 - 1610.6

MOBILE-SATELLITE

MOBILE-SATELLITE

MOBILE-SATELLITE

(Earth-to-space)

(Earth-to-space)

(Earth-to-space)

AERONAUTICAL

AERONAUTICAL

AERONAUTICAL

RADIONAVIGATION

RADIONAVIGATION

RADIONAVIGATION

RADIODETERMINATION-

Radiodetermination-Satellite

SATELLITE

(Earth-to-space)

(Earth-to-space)

722 727 730 731

731E 732 733 733A

733B 733E 733F

722 731E 732 733

733A 733C 733D 733E

722 727 730 731E

732 733 733A 733B

733E

1610.6 - 1613.8

1610.6 - 1613.8

1610.6 - 1613.8

MOBILE-SATELLITE

MOBILE-SATELLITE

MOBILE-SATELLITE

(Earth-to-space)

(Earth-to-space)

(Earth-to-space)

RADIO ASTRONOMY

RADIO ASTRONOMY

RADIO ASTRONOMY

AERONAUTICAL

AERONAUTICAL

AERONAUTICAL

RADIONAVIGATION

RADIONAVIGATION

RADIONAVIGATION

RADIODETERMINATION-

Radiodetermination-Satellite

SATELLITE

(Earth-to-space)

(Earth-to-space)

722 727 730 731

731E 732 733 733A

733B 733E 733F 734

722 731E 732

733 733A 733C

733D 733E 734

722 727 730 731E

732 733 733A 733B

733E 734

1613.8 - 1626.5

1613.8 - 1626.5

1613.8 - 1626.5

MOBILE-SATELLITE

MOBILE-SATELLITE

MOBILE-SATELLITE

(Earth-to-space)

(Earth-to-space)

(Earth-to-space)

AERONAUTICAL

AERONAUTICAL

AERONAUTICAL

RADIONAVIGATION

RADIONAVIGATION

RADIONAVIGATION

Mobile-Satellite

RADIODETERMINATION-

Radiodetermination-Satellite

(space-to-Earth)

SATELLITE

(Earth-to-space)

(Earth-to-space)

Mobile-Satellite

Mobile-Satellite

(space-to-Earth)

(space-to-Earth)

722 727 722 722 727

731E 731F 733 731F

732 733A 733B

730 731E 730 732 733A

733 733E 733F 733B 733E

731 731F 732 731E 733

733C 733D 733A 733E

1626.5 - 1631.5

1626.5 - 1631.5

MARITIME MOBILE-

MOBILE-SATELLITE (Earth-to-space)

SATELLITE

(Earth-to-space)

Land Mobile-Satellite

(Earth-to-space) 726B

722 726A 726D 727 730

722 726A 726C 726D 727 730

1631.5 - 1634.5

MARITIME MOBILE-SATELLITE (Earth-to-space)

LAND MOBILE-SATELLITE (Earth-to-space)

722 726A 726C 726D 727 730 734A

1634.5 - 1645.5

MARITIME MOBILE-SATELLITE (Earth-to-space)

Land Mobile-Satellite (Earth-to-space) 726B

722 726A 726C 726D 727 730

1645.5 - 1646.5

MOBILE-SATELLITE (Earth-to-space)

722 726D 734B

1646.5 - 1656.5

AERONAUTICAL MOBILE-SATELLITE (R)

(Earth-to-space)

722 726A 726D 727 729A 730 735

1656.5 - 1660

LAND MOBILE-SATELLITE (Earth-to-space)

722 726A 726D 727 730 730A 730B 730C 734A

1660 - 1660.5

LAND MOBILE-SATELLITE (Earth-to-space)

RADIO ASTRONOMY

722 726A 726D 730A 730B 730C 736

1660.5- 1668.4

RADIO ASTRONOMY

SPACE RESEARCH (passive)

Fixed

Mobile except aeronautical mobile

722 736 737 738 739

1668.4 - 1670

METEOROLOGICAL AIDS

FIXED

MOBILE except aeronautical mobile

RADIO ASTRONOMY

722 736

1670 - 1675

METEOROLOGICAL AIDS

FIXED

METEOROLOGICAL-SATELLITE (space-to-Earth)

MOBILE 740A

722

1675 - 1690

1675 - 1690

1675 - 1690

METEOROLOGICAL

METEOROLOGICAL

METEOROLOGICAL

AIDS

AIDS

AIDS

FIXED

FIXED

FIXED

METEOROLOGICAL-

METEOROLOGICAL-

METEOROLOGICAL-

SATELLITE

SATELLITE

SATELLITE

(space-to-Earth)

(space-to-Earth)

(space-to-Earth)

MOBILE except

MOBILE except

MOBILE except

aeronautical mobile

aeronautical mobile

aeronautical mobile

MOBILE-SATELLITE

(Earth-to-space)

722

722 735A

722

1690 - 1700

1690 - 1700

1690 - 1700

METEOROLOGICAL

METEOROLOGICAL

METEOROLOGICAL

AIDS

AIDS

AIDS

METEOROLOGICAL-

METEOROLOGICAL-

METEOROLOGICAL-

SATELLITE

SATELLITE

SATELLITE

(space-to-Earth)

(space-to-Earth)

(space-to-Earth)

Fixed

MOBILE-SATELLITE

Mobile except

(Earth-to-space)

aeronautical mobile

671 722 741

671 722 735A 740

671 722 740 742

1700 - 1710

1700 - 1710

1700 - 1710

FIXED

FIXED

FIXED

METEOROLOGICAL-

METEOROLOGICAL-

METEOROLOGICAL-

SATELLITE

SATELLITE

SATELLITE

(space-to-Earth)

(space-to-Earth)

(space-to-Earth)

MOBILE except

MOBILE except

MOBILE except

aeronautical mobile

aeronautical mobile

aeronautical mobile

MOBILE-SATELLITE

(Earth-to-space)

671 722

671 722 735A

671 722 743

1710 - 1930

FIXED

MOBILE 740A

722 744 745 746 746A

714

Additional allocation: in Canada and the United States. the bands 1240 - 1300 MHz and 1350 - 1370 MHz are also allocated to the aeronautical radionavigation service on a primary basis.

715

Additional allocation: in Indonesia. the band 1300 - 1350 MHz is also allocated to the fixed and mobile services on a primary basis.

716

Alternative allocation: in Ireland and the United Kingdom, the band 1300 - 1350 MHz is allocated to the radiolocation service on a primary basis.

717

The use of the bands 1300 - 1350 MHz. 2700 - 2900 MHz and 9000 -9200 MHz by the aeronautical radionavigation service is restricted to ground-based radars and to associated airborne transponders which transmit only on frequencies in these bands and only when actuated by radars operating in the same band.

718

In making assignments to stations of other services, administrations are urged to take all practicable steps to protect the spectral line observations of the radio astronomy service from harmful interference in the band 1330-1400 MHz. Emissions from space or airborne stations can be particularly serious sources of interference to the radio astronomy service (see Nos. 343 and 344 and Article 36).

719

WARC.92

In Bulgaria. Mongolia. Poland. the German Democratic Republic. Romania. Czechoslovakia and the U.S.S.R., the existing installations of the radionavigation service may continue to operate in the band 1350 -1400 MHz.

720

The bands 1370 - 1400 MHz. 2640 - 2655 MHz. 4950 - 4990 MHz and 15.20 - 15.35 GHz are also allocated to the space research (passive) and earth exploration-satellite (passive) services on a secondary basis.

721

All emissions in the band 1400 - 1427 MHz are prohibited.

722

In the bands 1400- 1727 MHz. 101 - 120 GHz and 197 - 220 GHz. passive research is being conducted by some countries in a programme for the search for intentional emissions of extra-terrestrial origin.

722A

WARC-92

Use of the band 1452 - 1492 MHz by the broadcasting-satellite service. and by the broadcasting service. is limited to digital audio broadcasting and is subject to the provisions of Resolution 528 (WARC-92).