Software Phase Correction Technique for Passive Radar

A traditional radar actively transmits pulses and receive the corresponding echoes. By computing time taken to echoes system is able detect targets estimate their ranges. However, mainly for military applications, an active has a major drawback: it can be detected by enemy since radiates electromagnetic pulses. As such, there currently high research development activity in field of passive systems. In this alternative scenario, does transmit any signal. Instead, uses signals already present environment, such as TV, radio broadcasts satellite digital video broadcast transmitters opportunity. measuring difference between signal received transmitter opportunity echoed targets, scenarios which use very low power illuminators opportunity, DVB-S or GPS, relatively long integration times are required order obtain reasonable values noise ratio. This implies that, besides frequency correction, coherency local oscillators receivers need maintained during intervals, difficult. The paper presents novel phase correction technique target area, references maintain all interval. proposed methodology quite simple enables low-cost hardware with independent reference surveillance channels geographically distributed. obtained results illustrate effectiveness applicability method.