Pasif radar hedef tespit performansinin iyileştirilmesi için çoklu ortak FM radyo vericilerin kullanılmasının araştırılması

Gizli operasyon kabiliyeti, uygun maliyet ve düşük bakım gereksinimi gibi özellikleri nedeniyle pasif radar sistemlerine olan ilgi giderek artmaktadır. Bu sistemlerin en büyük avantajı ise kendilerine ait bir vericiye ihtiyaç duymadan ortamda bulunan vericileri kullanarak hedef tespit ve takibi yapabilmeleridir. Son yıllarda sayıları artan kablosuz iletişim vericilerinin tek bir noktada toplanmaya başlanması ise pasif radar sistemleri için yeni fırsatlar yaratmaktadır. Bu çalışmada, ortak bir verici noktasından, birden çok frekansta yapılan FM radyo yayınların birlikte kullanılmasıyla pasif radar sistemlerinde hedef tespit performansının arttırılması araştırılmıştır. Önerilen yöntem sayısallaştırılan geniş bir frekans bandından ayrıştırılan tekil kanalların yazılım tabanlı radyo teknolojileri ile toplanarak hedef tespit performansının artırılmasını sağlamaktadır. Gerçek FM radyo verileri ile yapılan testlerde önerilen yöntemin sisteme ek yük getirmeden hedef tespit performansını artırdığı, modülasyon içeriği sebebiyle pasif radar sistemlerinde oluşan performans dalgalanmalarını ve oluşan hayalet hedefleri azalttığı görülmüştür.

Anahtar Kelimeler:

Pasif radar, FM radyo, Çoklu verici, Hedef tespit, Yazılım tabanlı radyo

Investigation of passive radar target detection performance improvement by using multiple co-located FM radio transmitters

Interest in passive radar systems is increasing because of its hidden operational capabilities, cost effectiveness and low maintenance requirements. The greatest advantage of these systems is that they can detect and follow targets using the illuminators in the environment without the need for a dedicated transmitter. In recent years, the increasing number of wireless transmitters have begun to be gathered at a single point, creating new opportunities for passive radar systems. In this study, target detection performance in passive radar systems by using multiple frequency FM radio broadcasts from a common transmitter point is investigated. Accordingly, a real-time applicable method proposed that combines the singular channels on a broad frequency band with software based radio technologies to improve target detection performance. It has been shown that the proposed method improves the target detection performance of FM signals without introducing additional load to the system and reduces the performance fluctuations and ghost targets that are generated in passive radar systems due to the modulation content.

Keywords:

Passive radar, FM radio, Multiple transmitter, Target detection, Software defined radio,

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