Document Type : Research Paper

Authors

• Alireza Azmoodeh Ardalan ¹
• Mohammad Edrisian ²

¹ Associate Professor at the Department of Surveying Engineering, University of Tehran

² Master of Arts at Imam Hossein University

Abstract

Considering the importance of position determination the and ease of using satellite methods in determining position, today global positioning systems such as GPS have become widely used in everyday life and military applications.
The point that is generally forgotten when using these satellite systems is the military basis of such systems. In addition, the strategic quality of position requires that the makers of such systems reserve the selective and exclusive access to the system in times of emergency and war. Due to the huge cost of establishing and maintaining such systems, this policy is not to be blamed, but it is necessary for national applications and purposes to determine an alternative or complementary positioning system in order to ensure that it can be relied upon in an emergency to continue positioning service. In this paper, a complete overview of land and satellite position determination methods including GPS, Transit, Glonass, Doris, Lauren A, Loren C and Omega types have been carried out and finally, according to the country's facilities and various analyses, Lauren C's positioning method or a similar system has been proposed as a national positioning system, with complementary role in peacetime and as substitute in emergency situations. The Lauren C positioning system is currently the GPS’ reserve system.

Keywords

• positioning؛ GPS؛ Doppler
• Glonas
• Doris
• Loren A
• Loren C
• Omega

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