Abstract
This paper presents the application of the time-frequency (TF) reassignment technique in passive forward scattering radar (FSR) using Digital Video Broadcasting – Terrestrial (DVB-T) transmitters of opportunity operating in the Very High Frequency (VHF) band. The validation of the proposed technique was done using real-life signals collected by the passive radar demonstrator during a measurement campaign. The scenario was chosen to test detection ranges and the capability of estimating the kinematic parameters of a cooperative airborne target in passive FSR geometry. Additionally, in the experiment the possibility of utilizing FSR geometry in foliage penetration conditions taking advantage of the VHF band of a DVB-T illuminator of opportunity was tested. The results presented in this paper show that the concentrated (reassigned) energy distribution of the signal in the TF domain allows a more precise target Doppler rate to be estimated using the Hough transform.
Highlights
Over the past decades, passive radars have evolved significantly [1,2,3], which can be seen in numerous demonstrations and works devoted to this topic [4,5,6,7,8]
The main problem in Passive Coherent Location (PCL) radar technology is that using classical passive radar processing for air target detection [9] does not allow one to detect and localize the target in the direction of the illuminator of opportunity, the radar is “blind” at this particular angle and the target is in the first range cell, which provides unclear detection results
Signals recorded by the passive radar demonstrator were processed with the passive forward scattering radar (FSR)
Summary
Passive radars have evolved significantly [1,2,3], which can be seen in numerous demonstrations and works devoted to this topic [4,5,6,7,8]. The use of FSR geometry range-Doppler plane Such a method will significantly improve the detection and tracking performance allows passive radar to detect and estimate main movement parameters such as target velocity for the in PCL processing. Tx –Rled x baseline [16,17] In such a case, data from the FSR module applied in PCL geometry in passive radar, and test novel methodsfor for target frequency ratethe estimation radars might be used as additional information the radar Doppler tracker, and detection which. This fact led the authors to study in more detail the possibility of applying FSR geometry operates in the band of 174–230 MHz [18] As these are relatively low frequencies, they penetrate the in passive radar, and test novel methods for target Doppler frequency rate estimation which might foliage well.
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