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Weak beacon detection for air-to-ground optical wireless link establishment.

Yaoqiang Han¹, Anhong Dang, Junxiong Tang

¹Department of Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, PR China.

|February 23, 2010

Summary

A new correlation beacon detection scheme uses m-sequence modulation and a digital differential matched filter (DDMF) array to overcome strong interference in free-space optical links. This method enables fast, effective beacon detection and reduces required transmission power.

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Area of Science:

Optical communication systems
Signal processing for optical links

Background:

Strong background interference hinders beacon detection in air-to-ground free-space optical communication.
Difficulty in establishing stable optical links due to poor beacon detection.

Purpose of the Study:

Propose a novel correlation beacon detection scheme for robust performance under strong background interference.
Enhance the reliability and efficiency of beacon detection in free-space optical systems.

Main Methods:

Modulating the beacon signal with an m-sequence at the transmitter.
Employing a digital differential matched filter (DDMF) array at the receiver for correlation reception.
Utilizing parallel processing capabilities of the DDMF array for each pixel.

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Main Results:

The proposed scheme effectively suppresses strong interference and noise through correlation reception.
Parallel processing by the DDMF array enables rapid beacon detection.
Demonstrated feasibility through theoretical analysis and outdoor experiments.

Conclusions:

The correlation beacon detection scheme provides fast and effective beacon detection in challenging environments.
Significant reduction in required beacon transmission power is achievable.
The DDMF array architecture facilitates high-speed parallel signal processing for optical link establishment.