MQ-5 Hunter is an unmanned aerial aircraft, which was manufactured by the Israel aerospace industry. In the United States, Northrop Grumman also produced, and supplied to the US military. RQ-5 Hunter is a reconnaissance aircraft. MQ-5 Hunter is an

attack version, which can carry the GBU-44/B laser-guided bomb that weighs about 20 kg.

Israeli Aviation Company developed the unmanned aircraft called Scout. It was being put into combat in 1982. To propel the Scout, a piston engine that mounts 13-foot propeller blade made of glass fiber is used. This UAV is very small in size, which emits a small radar cross section. It is nearly impossible to shoot down. Furthermore, it can transmit the real-time, 360-degree monitoring data via the central television camera. During the 1970s, the Israeli military was becoming increasingly interested in battlefield UAVs. The Scout had a similar configuration as the Mastiff, with a pusher propeller and a twin-boom tail. Table 1 illustrates the characteristics of both Hunter and Scout.

Searcher-II is produced by IAI-Malat, back in 1996. This aircraft has been deployed in the Indian Army and Air Force. More than 100 Searcher IIs are being operated by the Indian Air Force and the Indian Navy.

Israel, which has a state-of-the-art technology of the unmanned aircraft, has embarked aggressively on overseas sales of the above-mentioned drones. Recently, it is known for the focus on Indian market sales. Israeli Defense Ministry requests that the drone’s flight performance should be important than the speed. It is also conjectured that the drones can substitute the conventional manned fighters. Currently, Israel leads the combat deployment of the Hermes 450 unmanned aircraft for long-term flight infor-

mation collection. This is a large drone equipped with various sensors. Table 2 illustrates the characteristics of both Searcher and Hermes 450.

Predator is a model that was developed by the General Atomics, Inc. It is considered as one of the most successful unmanned machines in the US Military. It is manufactured for reconnaissance, and called by the name RQ-1. It is also equipped with weapons. This variant is called MQ-1. Predator is a huge drone, and its large scale system requires the full-time personnel of about 55 people to operate. Predator can conduct an automatic flight along a path that has been programmed in advance. By using the satellite communication and the encrypted data link, it can fly anywhere in the world remotely.

Avenger is the combat drone that has been developed by the General Atomics Aeronautical System Company. It is one of the latest unmanned aircrafts of the US Army. In 2012, the company improved the ground control station. Avenger uses the same ground support infrastructure as the MQ-1 and MQ-9, including the ground control station and existing communications networks. Table 3 illustrates the characteristics of both Predator and Avenger.

Global Hawk is the product of the Northrop Grumman Corporation of United States. It is equipped with an all-weather synthetic aperture radar (SAR), electro-optical/infrared sensor (EO/IR), the moving target indicator, high-resolution electro-optical sensors, digital camera, and the third-generation infrared sensor. Its integrated sensor devices operate via a common signal processor that is comparable to the diameter of 1.2 m antenna and the supercomputer. Once it takes off, it can be flying up to 32 hours. It flies at a height that is not affected by the bad weather and the prevailing wind. Its flight altitude is out of anti-aircraft guns and most missiles intercept range. It is controlled via a dedicated radio channel and the satellite communication network. Table 4 illustrates the characteristics of Global Hawk.

Most GCS design has been found that it provides enough level of battlefield information as well as the UAV flight information. It also emphasizes the minimization of the cognitive load. Operator reaction speed and accuracy are also very important. Improved visibility of battlefield situations has been realized using advanced graphical techniques, while enables the fast identification of threats. This early detection and identification of the magnitude of the threat allows the rapid decision making. The human interface is evolved into touch-screen and multi-screen system for fast reaction and vast presentation of necessary information. The individual convenience of the operator in terms of the configuration of a display screen has been implemented by the customization. A large screen is also being used to maximize the display size for information presentation.

Analysis of the unmanned system GCS, depending on the changing battlefield environment, has confirmed that the GCS is in the direction of maximizing quick judgment. The size of the screen tends to increase, as well as the number of screens. There is a tendency to place the screen up and down in order to reduce the fatigue of the operator. In addition, it uses a three-dimensional tactical map to express the battlefield situation in detail. The symbol for differing information has been classified by the colors. In order to reduce the work load of the pilots, additional operational personnel is present to work the system. Table 5 summarizes the findings.