Mobile millimeter wave communication link
A point-to-point, wireless, millimeter wave communications link between two stations at least one of which is a mobile station. A millimeter wave transmitter system operating at frequencies higher than 57 GHz with a tracking antenna producing a beam having a half-power beam width of about 2 degrees or less and a millimeter wave receiver also with a tracking antenna having a half-power beam width of about 2 degrees or less. In preferred embodiments each mobile station has a global position system (GPS) and a radio transmitter and both tracking antennas are pointed utilizing GPS information from the mobile station or stations. The GPS information preferably is transmitted via a low frequency, low data rate radio. Each millimeter wave unit is capable of transmitting and/or receiving, through the atmosphere, digital information to/from the other station at rates in excess of 155 million bits per second during normal weather conditions. In preferred embodiments actually built and tested by Applicants digital information has been transmitted at rates of 1.25 gigabits per second. Preferred communication links described here are millimeter wave links operating at frequencies of 71-73 GHz and 74-76 GHz mounted on simple two-axis gimbals. Pointing information of the required accuracy is provided by GPS receivers and standard radio links which send the GPS calculated positions to the millimeter wave systems at the opposite end of the link. In these embodiments there is no need for any complicated closed loop pointing information derived from received signal intensity or phase. On moving platforms locally generated inertial attitude information is combined with the GPS positions to control pointing of the gimbaled transceivers.
1. A high-data-rate, line-of-sight millimeter wave communications system appropriate for transmitting information between a first platform and a second platform, at least said first platform being a mobile platform, said high-data-rate, line of sight millimeter wave communications system comprising:
A) a first pointing radio system mounted in or on said first platform, said first pointing radio system comprising:
1) a first GPS receiver for monitoring GPS positions of said mobile platform,
2) a radio transmitter mounted on said moving platform, for transmitting GPS positions of said mobile platform to said second platform;
3) a millimeter wave radio transmitter comprising a first millimeter wave antenna for transmitting information at frequencies in excess of 57 GHz and at data rates in excess of 100 Mbps within a half-power beamwidth of less than 4 degrees to said second platform;
4) a first pointing apparatus with pointing controls programmed to point said first millimeter wave antenna toward said second platform based at least in part on position information provided by said first GPS receiver;
B) a second pointing radio system mounted in or on said second platform, said second pointing radio system comprising:
1) a radio receiver mounted on said second platform, for receiving GPS positions of said mobile platform from said mobile platform;
2) a millimeter wave radio receiver comprising a second millimeter wave antenna for receiving information at frequencies in excess of 57 GHz and at data rates in excess of 100 Mbps from said mobile platform
3) a second pointing apparatus with pointing controls programmed to point said second millimeter wave antenna toward said first platform based at least in part on position information provided by said first GPS receiver.
2. The communications system as in claim 1 wherein said first pointing radio system further comprises an inertial measurement system and said pointing controls of said first pointing apparatus are programmed to point said first antenna utilizing data provided by said inertial measurement system as well as GPS data.
3. A high-data-rate, line-of-sight millimeter wave communications system appropriate for transmitting information between a first platform and a second platform, at least said first platform being a mobile platform, said high-data-rate millimeter wave communications system comprising:
A) a first pointing radio system mounted in or on said first platform, said first pointing radio system comprising:
1) a first GPS receiver for monitoring GPS positions of said mobile platform,
2) a radio transmitter mounted on said moving platform, for transmitting GPS positions of said mobile platform to said second platform;
3) a millimeter wave radio receiver comprising a first millimeter wave antenna for receiving information at frequencies in excess of 57 GHz and at data rates in excess of 100 Mbps from said second platform;
4) a first pointing apparatus with pointing controls programmed to point said first millimeter wave antenna toward said second platform based at least in part on position information provided by said first GPS receiver;
B) a second pointing radio system mounted in or on said second platform, said second pointing radio system comprising:
1) a radio receiver mounted on said second platform, for receiving GPS positions of said mobile platform from said mobile platform;
2) a millimeter wave radio transmitter comprising a second millimeter wave antenna for transmitting information at frequencies in excess of 57 GHz within a half-power beamwidth of less than 2 degrees and at data rates in excess of 100 Mbps to said mobile platform
3) a second pointing apparatus with pointing controls programmed to point said second millimeter wave antenna toward said first platform based at least in part on position information provided by said first GPS receiver.
4. The communications system as in claim 3 wherein said first pointing radio system further comprises an inertial measurement system and said pointing controls of said first pointing apparatus are programmed to point said first antenna utilizing data provided by said inertial measurement system as well as GPS data.