ALDAS ALDASThe problems of determining the performance of an antenna installed on a structure such as an aircraft or spacecraft are very great and are especially important when the structure is in the design phase. The use of a computer program to examine the installed performance can save a great deal of time and money in the design phase and later when antennas are to be added to an existing structure.
ALDAS uses the methods of diffraction theory (GTD and UTD) to compute the radiation pattern of a low gain antenna installed on a conducting structure. This may be in the near or far field. The coupling between antennas on the structure can also be computed. The structures which can be modelled include aircraft, spacecraft, ships, ground vehicles and antennas on masts.
ALDAS is used by a wide range of customers ranging from aircraft and spacecraft manufacturers to providers of cellular phone services.
A large number of facilities are provided.
Output data files are provided. Extensive graphics are included to help with visualisation of the input and output data.
Coupling and nearfield options are also included in the package.
Look at specimen screens from a worked example (originally presented at ESTEC in October 1997)
Look at the use of ALDAS in radar system modelling for arrays on aircraft, reflectors on helicopters, choosing an antenna site on a car.
ALDAS is available on various platforms.