The Roland Remote Radio Navigation System developed by the US Department of Defense has become a user in the world...
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The Roland Remote Radio Navigation System is one of the systems with more users worldwide. It has more than 300,000 marine users, more than 500,000 aviation users, and a large number of land users. This system was originally developed for military purposes and was developed by the US Department of Defense. Due to the many advantages of the system in terms of reliability, accuracy, cost and effective range, the number of users has increased rapidly and has grown rapidly.
Roland-A system, the working distance is about 1300 km, the working area positioning accuracy is about 926~1852 meters, and the sky wave is used at night, the working distance can reach 259.28 million meters. This system developed rapidly in the 1940s, reached its peak in the 1970s, and has more than 80 launch pads around the world. Its sky waves cover most of the waters of the North Pacific and the North Atlantic, and thus the number of users exceeds 100,000. After that, the Roland-C system with superior performance appeared. In 1980, the United States spent five years completing the deployment process of replacing Roland-A with Roland-C. The Roland-C system works better than Roland-A in terms of distance and accuracy. At present, the system's worldwide deployment task has been completed as early as 80 years, effectively covering the entire northern hemisphere. The United States plans to stop using the Roland-A system station overseas after 1994, but will continue to retain the Roland-A system, considering users in some areas.
The Roland-D system is the latest generation based on the Roland-C principle. It is a US military tactical maneuvering mid-range navigation positioning system. After field tests, the Roland-D system has a positioning accuracy of 463 meters and a repeatability error of 18 meters in the range of 463,000 meters. At present, the system has five sub-chains, which are located in the North Sea waters of Northern Europe, North-West Europe, the southwestern United Kingdom, Malaysia and the Yellow Sea region of China. They are mainly used for high-precision navigation and positioning services required for offshore oil development.
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