Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
1998-06-29
2001-03-13
Jung, Min (Department: 2739)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C370S318000, C455S013400, C455S069000
Reexamination Certificate
active
06201786
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Related Applications
The present invention relates to my co-pending U.S. application Ser. No. 09/107,209 filed Jun. 29, 1998 for A Method for Optimum Dissemination of Multi-Sensor Products.
2. Field of the Invention
The present invention relates to communication data links of the type employed between airborne platforms and ground stations. More particularly, the present invention relates to a novel rulti-channel data link where each channel is independently and adaptably controllable for data rate and power.
3. Description of the Prior Art
It is known that airborne surveillance platforms are used to capture optical images, infrared images and/or radar images and to process thre sensed information into a digital format for communication to a ground station or stations over a data link. Daal mode radar images have been captured and down loaded in real time over single channel data link.
In my U.S. Pat. No. 5,559,788 which is incorporated by reference herein, there is shown and described a multi-channel communications data link in which one input channel contains control information and the other quadrature input channel contains picture product information. In this patent, the two different types of information are combined and the combined data is transmitted over two different types of antennas. Then two different types of receivers are employed in ground stations in which only one of the receivers is capable of utilizing the picture product information.
It would be desirable to provide a dual channel data link capable of transmitting simultaneously two diverse picture products to all ground stations, however, only some of the ground stations can utilize both diverse picture products. It is further desirable to be able to control data throughput and transmission energy of the two diverse picture products in a manner which optimizes the use of available transmitter power and enhances picture quality at a plurality of the receivers.
SUMMARY OF THE INVENTION
It is a principal object of the present invention to optimize the reception of two diverse picture products at a plurality of ground station receivers.
It is a principal object of the present invention to transmit power representative of two diverse picture products over a multi-channel data link at controlled power levels.
It is a principal object of the present invention to determine at the transmitter the data integrity of the picture product being received at a ground station receiver to permit allocation of the percentage of total power between two diverse picture product signals transmitted to a plurality of ground station receivers.
It is a principal object of the present invention to provide a method and means for apportioning power between two diverse picture product channels that guarantees that at least one of the diverse picture products can be received by all ground station receivers.
It is a principal object of the present invention to provide a novel data link controller for proportioning power and setting data rates between two diverse picture product channels to guarantee that receivers in a maximum jamming hostile environment are supplied with a signal of sufficient signal to noise ratio strength so that the receiver can receive and display at least one of the desired diverse picture products without degradation.
It is a principal object of the present invention to control the power and data rate of transmission of one of said diverse picture product channels in a manner that all receiver users receive a useful picture product signal and any remaining power can be diverted to the other diverse picture product channel.
It is another principal object of the present invention to prioritize energy available at the transmitter to one of two diverse picture products channels and energy left over after supplying the higher priority picture product channel and to apportion the remaining power to the other picture product channel.
It is a general object of the present invention to be able to utilize and transmit the maximum amount of information available from a sensor in one of two diverse picture product channels and allocate all remaining energy to the remaining picture product channel.
It is another general object of the present invention to provide a continuously adaptive feedback loop signal which measures the data integrity of both diverse picture product channels and to continuously and adaptively control the data rate and power in the two diverse picture product channels independent of each other.
It is a general object of the present invention to provide a multi-channel data link apparatus and system for combining two orthogonal signals (in quadrature) and transmitting the two signals at the same frequency over a multi-mode data link communications channel.
According to these and other objects of the present invention, there is provided an apparatus and method for transmitting two picture products in the form of an in-phase and quadrature data component signal from an airborne platform which is received by ground station receivers capable of determining the inherent quality of the data component signals so that they are capable of transmitting back to the airborne platform signals indicative of the maximum data rate at which no picture quality errors or at which a standard of quality will occur at the present signal power level being received. The multi-mode data link processor continuously receives the signals from the plurally of ground station receivers and simultaneously adjusts the data rate and power level of the data component signals to obtain a predetermined optimum picture quality.
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Weber Bruce John
Zscheile, Jr. John Walter
Anderson Terry J.
Hoch, Jr. Karl J.
Jung Min
Northrop Grumman Corporation
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