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## Volume search, acquisition, and track

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Wireless communication systems that contain users that are moving in position and incorporate directional antennas require volume search, acquisition, and tracking methods to discover and maintain the communication link. Volume search is used to discover the user, acquisition is used to acquire the user by narrowing down the position of the user in order to point the antenna in the direction of the user, and tracking is used to lock on to the user's position and maintains the position as the user is moving in order to point the antenna in the direction of the user. There are several methods used to implement volume search, acquisition, and track depending on the requirements and capabilities of each system.

Chapter Contents:

• 10.1 Volume search
• 10.1.1 Raster scan
• 10.1.2 Binary scan
• 10.1.3 Random scan
• 10.1.4 Bias expansion scan
• 10.1.5 Outside-in volume search
• 10.1.6 Inside-out volume search
• 10.1.7 Directional volume search results
• 10.1.8 Beam spoiling
• 10.1.9 Sidelobe detection
• 10.1.10 Coordinate conversions for volume-search process
• 10.1.11 Directional antenna beam
• 10.2 Acquisition: two-dimensional sequential scanning
• 10.3 Track
• 10.3.1 Linear and angular velocity
• 10.3.2 Sequential lobing
• 10.3.3 CONical SCAN (CONSCAN)
• 10.3.4 Monopulse
• 10.3.5 Alpha—beta tracker
• 10.3.6 Integrating closed-loop tracker with open-loop navigational tracker
• 10.4 Summary
• 10.5 Problems

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