Radar operation is possible without any dedicated transmitter by using an illumination of opportunity for the observed area. Examples are analogue and digital television systems (DVB-T), digital audio broadcast (DAB) and various mobile communications base stations. For example, we use the widespread existence of the digital wireless communication system GSM (global system for mobile communication). The base stations are ubiquitous and represent illuminators that may be used silently without any permission. Air and ground surveillance of moving targets up to medium ranges may be achieved. The transmitted power is comparable to that of the omnidirectional low probability of intercept (OLPI) system described in Chapter 18. Therefore a similar detection range can be expected.

Chapter Contents:

• 20.1 Introduction
• 20.2 Parameters and achievable range
• 20.3 Signal description and resolution
• 20.4 Signal processing
• 20.4.1 Adaptive beamforming
• 20.4.2 Clutter cancellation
• 20.4.3 Signal integration
• 20.5 Reference signal
• 20.6 Experimental results
• 20.7 Tracking
• References

Inspec keywords: cellular radio; passive radar

Other keywords: omnidirectional low probability of intercept system; GSM; digital audio broadcast; air surveillance; digital television systems; mobile communications base stations; OLPI system; global system for mobile communication; digital wireless communication system; passive radar; DAB; ground surveillance; analogue television systems; DVB-T; moving targets

Subjects: Radar equipment, systems and applications; Mobile radio systems