Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Reexamination Certificate
2003-12-23
2004-11-09
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
C342S361000
Reexamination Certificate
active
06816114
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an airship, and more particularly, to a system for tilting polarization and steering main beam of airship antenna and ground station antenna using GPS (Global Positioning System), which can maintain reliable telecommunication link by aligning polarization and main beam of airship antenna and ground station antenna each other from azimuth and elevation coordinates of airship.
PRIOR ART
Generally, an high altitude unmanned airship makes a long stay at an altitude of 10-20 Km to perform various functions of satellite such as telecommunication relay, remote exploration, weather forecast, scouting and monitoring and the like.
This airship can float by itself by buoyancy difference from air, so that it flies through the stratosphere, stable air layer, and performs these functions.
FIG. 1
represents the configuration of general airship ground station system. Wherein, airship and ground station system means airship
100
and ground station
150
, which communicates with the airship
100
, and it is applied over the whole specification.
As shown in
FIG. 1
, the 1
st
GPS receiver
120
having GPS antenna
121
is located in the airship
100
.
The airship
100
includes shelter
102
, which is equipped with telecommunication device, engine, equipment and the like, in the bottom part of it.
The shelter
102
includes airship antenna, which is the antenna for communicating with ground station
150
and is called “airship communication antenna” sometimes.
And, the ground station
150
makes wireless communication with the airship
100
and receives information from the airship
100
. The ground station
150
is divided into stationery station and moving station.
The ground station
150
includes ground station antenna
160
for communicating with the airship
100
and the 2
nd
GPS receiver
170
for receiving the position information of the ground station
150
.
In the meantime, the airship
100
should maintain reliable communication link to perform the functions mentioned above, and many techniques have been developed for it as below.
Firstly, according to S/W techniques, these methods lower the error rate of data by communication system using signal process and modulation to maintain reliable communication link between airship and ground station.
According to H/W techniques, many antennas are used. They include dual polarization antenna using vertical and horizontal polarization in the same time, high gain low lobe antenna and adaptive antenna.
However, conventional methods mentioned above have problems as below.
That is, the conventional methods need many test processes such as the test of database to reduce error rate that happens in communication link maintenance process. And consequently, cost gets higher for communication link maintenance.
According to one of conventional methods, an airship
100
is equipped with omni-directional antenna for communication link maintenance, but this method has low efficiency on electric power.
And, there is no method regarding to steering main beam direction and tilting polarization between an airship
100
and ground station
150
by using GPS
120
to maintain reliable communication link.
SUMMARY OF THE INVENTION
The present invention was devised to solve the problems mentioned above.
An object of the present invention is to provide a system for tilting polarization and steering main beam of airship antenna, which can maintain reliable communication link by aligning polarization between airship antenna and ground station antenna based on information of azimuth and elevation of airship using GPS.
Other object of the present invention is to provide a system for tilting polarization and steering main beam of airship antenna, which can maintain reliable communication link by aligning main beam between airship antenna and ground station antenna based on information of azimuth and elevation of airship using GPS.
Still another object of the present invention is to provide a system for tilting polarization and steering main beam of airship antenna, which can provide safe control for devices in airship by tilting polarization and steering main beam between airship antenna and ground station antenna to maintain reliable communication link.
In order to achieve the object, a system for tilting polarization and steering main beam of airship antenna according to the present invention comprises: a 1
st
GPS receiver, which is located in the airship; a 2
nd
GPS receiver, which is located in the ground station; an airship antenna database for extracting the radiation pattern information of airship antenna and polarization information according to the posture of the antenna based on the position information of the airship; a ground station antenna database for extracting the radiation pattern information of ground station antenna and polarization information according to the posture of the antenna based on the position information of the ground station; a polarization and main beam direction correction operating device for computing the correction value of polarization and main beam direction of the airship antenna and the ground station antenna based on the position information of the airship and the ground station received from the 1
st
GPS receiver and the 2
nd
GPS receiver; and an airship antenna controller for correcting the posture of the airship antenna by controlling the tilting polarization and the steering main beam direction of the airship antenna based on the corrected value received from the polarization and main beam direction correction operating device.
REFERENCES:
patent: 3030500 (1962-04-01), Katzin
patent: 5818385 (1998-10-01), Bartholomew
patent: 5917446 (1999-06-01), Greenspan
patent: 6512481 (2003-01-01), Velazquez et al.
N.N. Borisov et al., Alignment of antennas operating on tropospheric links, Telecommunications-and-Radio-Engineering-Part-1 vol. 28(2), p. 29-31, Feb. 1974 (Translation of: Elektrosvyaz (USSR), vol. 28(2), p. 40-42, Feb. 1974).*
J. Rogers, The global autotracker-an automatic antenna pointing mechanism, Microwaves and RF Conference Proceedings, p. 191, Oct. 1995.
Kim Hyounkyoung
Kim In-kyu
Kim Taesik
Lee Haechang
Lee Sangjong
Armstrong Kratz Quintos Hanson & Brooks, LLP
Gregory Bernarr E.
Korean Aerospace Research Institute
Mull Fred H
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