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Brian B. Luu, Rommie L. Hardy, and George T. Tran U.S. Army Research Laboratory Adelphi, MD

preprocessing technique for using and integrating TIREM into the MANE software system to improve the precision of the calculated radio propagation path loss.

In the next section, we provide background information on MANE and TIREM. Then, we describe the pre-computed technique and discuss the benefit of using the technique. In the conclusion, we mention an underway plan of using high performance computing systems and MANE with pre-processing technique to increase MANET emulation capability at ARL.

As mentioned above, MANE is a computer software system working along with some hardware to emulate a MANET system. Four main programs (modules) of the MANE software were used in the ARL test bed: Global Positioning System (GPS) Emulator, Forwarding Engine, Range Model, and Test Node (TN) Packet Treatment.

Originally developed by Naval Research Laboratory, the Mobile Ad hoc Network Emulator (MANE) [1] is a software and hardware test bed tool used to emulate a mobile ad hoc network (MANET) environment.

The GPS Emulator (GPSE) program reads in time-stamped GPS information and distributes it to test nodes using network multicast. For ARL implementation, a MANET scenario, which contains GPS information of test nodes at time steps, is generated by the ARL Topodef tool [2] (a

The U.S. Army Research Laboratory (ARL) has improved and used a version of MANE test bed to conduct research

on wireless mobile improvements is the

ad

hoc

networks.

One

of

the

integration of the Terrain-Integrated

Rough-Earth Model

(TIREM) into

MANE

to

provide

more

fidelity in calculating the radio propagation path More accuracy in determining the radio path loss in

loss. turn

visual system and method for designing specific mobile network topologies). At every time step, GPS positions (latitude, longitude, and altitude) are provided for each test node by their corresponding files as collective information called a network topology. All topologies make up a scenario of the entire movement of MANET

nodes (test nodes).

provides more accuracy in determining network links

nodes

in

MANET

environment.

The

integration

of of

TIREM in determining the radio the decision to forward network environment.

path loss also expedites packets in the MANET

A new interface was created to provide an option to use the pre-computed path losses in the MANE test bed. This paper describes the implementation of an efficient

The GPSE reads in the GPS information of test nodes from the files containing their positions at a particular time in the format of hours:minutes:seconds and position location in degree format for longitude, latitude, and in meter unit for altitude. This longitude and latitude format is converted into a compressed format using positive integers (instead of double precision floating point) and

scaled by a factor, 60000, to retain precisions (up to 1

U.S. Government work not protected by U.S. copyright.

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