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Want GPS-independent navigation systems "

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Want GPS-independent navigation systems "
The TAMM plant develops and produces three navigation families - a mechanical, fiber-optic and laser-based system. "We are part of a very small country club that can develop, manufacture and integrate sea, dry and air navigation systems," the factory says

Ami Rohx Dumba | 30/04/2020 Contact author
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Courtesy of TAMM - Air Industry

The TAMM plant employs about 400 people and is responsible for developing most of the IDF's navigation systems. The plant was established sometime in the 1960s, according to publications in France, after the transfer of technology from France around a joint missile project between the countries. In Israel, independence in navigation systems. The plant produces three navigation families - a mechanical, fiber-optic and laser-based system.

"The goal was to establish an inertial navigation center in Israel for self-development," explains Ariel, head of navigation engineering at Tamam, Israel's aerospace industry. The plant has two lines of business - optronics and navigation systems. Like other aerospace industries, it is divided into engineering and business executives. "The Navigation Manager produces encryption systems (find the north) and navigation. If you want to encrypt your cannon or any other launcher that needs to find the north, you need a dedicated system that knows how to do it. Navigation systems allow you to get from one point to the other exactly," Uriel.



The NMR develops two types of gauges. Accelerometer and gyroscope or gyro in short. The accelerometer tests the speed in wired motion and the gyro measures the angle of rotation. "Many years ago we developed a mechanical gyro," says Ariel. Was the factory's first gyro. In the 1980s we developed a fiber optic gyro (FOG). Such a product has a winding optical fiber with two light rays in opposite directions that need to reach the same point, at the same time. As the gyro moves, measure the time difference between the horns and know the direction of rotation. Such measurement is done in three axes in parallel and know the direction of movement of the platform. The accelerometer measures how much distance it has made in each axis. "



Three gyroscopes together, each with an accelerometer, make up a navigation unit called the IMU. If you add GPS to this unit, it is called INS. "There are customers who buy only the IMU from us and assemble the GPS alone. And there are customers like the IDF who buy from us a complete system," Uriel explains.

"The systems differ in accuracy (measurement). The challenge is to improve the electronics, and to balance the physical size of the unit and the desire to maintain sufficient fiber length for accuracy. The longer the fiber, the more accurate the measurement. There is an opposite trend - want to reduce the navigation system Physically without hurting exactly. Gyro FOB drift is best suited to applications with short live time. Like a missile. As time goes on, drift increases and accuracy decreases. "



In the late 1990s, a laser-based navigation system called RLG or Ring Laser Gyroscope was added. From parallel systems. As such, it is suitable for applications with long operation time. Aerospace Industries is one of four manufacturers in the world that controls this technology, "says Uriel." Such research takes about a decade. "



The director's development is done by six doctoral students who form the professional core of navigation in Israel. "Every problem in our navigation system comes to them. There are no forums on the Internet that can be consulted in the context of navigation systems. We also have collaborations with the Technion and Tel Aviv to develop future navigation technologies," says Uriel.

Alongside the systems development, the aerospace industry also provides a shell integration tool. "Adapting a navigation system to this platform is a unique professional niche," explains Zalman, director of technology and R&D at the Tamim Factory Navigation Administration. "There are manufacturers in the world who know how to integrate only tools into one dimension - sea, land or air. We know how to do all the dimensions. One of the reasons that there is full development and integration capabilities here is what the IDF needs is that you cannot import the technological edge in the field. They won't sell to you. "

In the US, for example, Hannibal is considered to be a world leader in the field. This, after investing billions of dollars, has invested far less in GDP to reach those capabilities. The US does not sell advanced navigation systems to other countries. Neither to Israel. And what it does, sells under the ITAR regime, which requires Israeli industries to declare who sells the final product and for what purpose. Such conditions limit Israeli industries in competition in the world with other industries.

"The advantage of local capabilities is expressed by adjusting the accuracy to the platform. A tank does not need precision like a cannon. Pricing works according to the accuracy (degree of drift) of the system. The tank and the navigation system cannon are the same system, the difference. Itself. We do it for everyone. Produce measurements, systems and do the integration, "says Zalman.

Another investment made in the NMR plant over the past year is in the mirror coating line for LRG systems. LRG has three mirrors, one for each axis. The mirror production includes a small glass disk that is manufactured locally and which should be expected. As previously mentioned, any such transaction requires explanations from the aerospace industry. In order to preserve independence, the Ministry of Defense decided to invest NIS millions on a local coating line whose construction is currently underway. "We want to reach the world without GPS. In every task, "Uriel concludes." We are in the development stages of technology. It will take a few more years, but it will bring us to a world where NAV or platform navigation systems do not depend on an external source. "
https://www.israeldefense.co.il/he/node/42841 translted by google
 

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