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Return-link-design-for-PSD-limited-mobile-satellite-communication-systems

Radio telecommunication terminal

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Return link design for PSD limited mobile satellite communication systems

Details

Inventors: de La Chapelle, Michael; O'Brien, Kevin M.;
Assignee: The Boeing Company (Chicago, IL)
Primary Examiner: Maung; Nay
Assistant Examiner: Perez; Angelica M.
Attorney, Agent or Firm: Harness Dickey & Pierce P.L.C.

A system and method for managing access to a satellite-based transponder by a plurality of aircraft each having a mobile radio frequency (RF) system. The system employs a ground-based, central control system for managing access to the satellite-based transponder so that the aggregate power spectral density (PSD) of the RF signals of all the mobile systems does not exceed, at any time, limits established by regulatory agencies to prevent interference between satellite systems. This is accomplished by a dual control loop arrangement for monitoring the signal-to-noise ratio (Eb/No) of the RF signal transmitted by the satellite-based transponder. A ground-based control loop is used whereby a ground-based central controller monitors the Eb/No and transmits commands to the aircraft (via the satellite transponder) to maintain the Eb/No of the transmitted signal within a predetermined range. A fast scan angle compensation is used by the mobile system of the aircraft to implement another control loop to further adjust the transmit power. This control loop maintains the Eb/No of the signal transmitted to the satellite-based transponder at the commanded level inbetween updates from the ground-based central controller.

DETAILED DESCRIPTION The above and other objects are provided by a method and apparatus for providing television and data services to mobile platforms.
More particularly, the invention relates to a method and apparatus for managing the aggregate PSD of a plurality of mobile terminals operating within a given coverage region and accessing a shared satellite-based transponder, such that the aggregate PSD does not exceed predetermined regulatory PSD limits for GSO and NGSO interference.
In one preferred embodiment, the system of the present invention makes use of a ground-based segment having a central controller.
Each mobile terminal sends a "request-for-authorization-to-transmit" signal to the satellite-based transponder, which is then relayed by the transponder to the ground station, which receives the request and forwards it to the central controller.
This signal includes a variety of information which enables the central controller to determine the PSD of the RF signal which will be transmitted by the particular mobile terminal if authorization to transmit is given.
This information typically includes the location of the mobile terminal (i.
e.
, the location in terms of latitude and longitude of the mobile platform associated with the mobile terminal), the location of the satellite-based transponder to which it is transmitting, the type and design of transmit antenna being used on the mobile terminal, the transmit power (P.
sub.
i) of the mobile terminal, and the pointing coordinates for the mobile transmit antenna (i.
e.
azimuth and elevation angles).
Optionally the mobile platform heading, pitch and roll angles may be sent instead of the antenna coordinates.
The central controller uses the above information to determine the PSD of the RF signal to be transmitted by the mobile terminal and adds it to the aggregate PSD of the other mobile platforms sharing the transponder channel.
The central controller then compares the new aggregate PSD to a predetermined regulatory PSD limit to ensure that the PSD limit will not be exceeded if the mobile terminal is allowed to transmit

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