Passive Radar Array With Low-Power Satellite Illuminators Based on Fractional Fourier Transform

Li, Zhongyu; Santi, Fabrizio; Pastina, Debora; Lombardo, P.

doi:10.1109/jsen.2017.2765079

Cited by 32 publications

(18 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 9a, the target location is estimated from tτhree elliptical trajectories from one FM and two T-DMB illuminators, which are located in Anseong, Gwanaksan and Gwanggyosan. Equations (1) and (2) are used to derive the cross-correlation in the signals between the reference channel and the surveillance channel [1,5,8,18,19]. Since the delay and Doppler frequency of the signal are related to the target's location and velocity, respectively, the ARD map of the target can be driven from the equations.…”

Section: Mast Height (Hm) 8 M Reference Beammentioning

confidence: 99%

“…In recent years, there has been ongoing development of aircraft with low-probability-of-intercept (LPI) capabilities, which are difficult to track using conventional radar systems. To counter these technologies, passive coherent location (PCL) radars using commercial low-frequency broadcast signals, such as frequency modulation (FM) radio [1,2], digital TV [3][4][5][6], analog TV [7], satellites [8,9], and mobile communications [10], have been studied extensively. In particular, PCL radars using low-frequency bands, including the very high frequency (VHF) band of FM broadband signals, can effectively counter long-range targets with radar absorbing material (RAM) or radar absorbing structure (RAS).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Performance Prediction of a Dual-Band Coupled-Fed Dipole Array Antenna for PCL Systems in the VHF Band

2020

View full text Add to dashboard Cite

Featured Application: This article is related to passive radars using public broadcast signals in the VHF band.Abstract: This article proposes the design of a dual-band coupled-fed dipole antenna for passive coherent location (PCL) systems in the very high frequency (VHF) band. The proposed indirect coupled feed mechanism, which is often employed in microstrip patch antennas, is first applied to VHF band dipole elements for dual-band matching. To confirm the effectiveness of the proposed design, we fabricate the coupled-fed dipole element and measure antenna characteristics, such as the voltage standing wave ratio (VSWR) and the antenna gain. The proposed antenna element is then applied to an eight-element circular array to form the reference and surveillance beams for PCL systems. Finally, the target location is estimated by constructing amplitude-range doppler (ARD) maps for one frequency modulation (FM) and two terrain digital multimedia broadcasting (T-DMB) illuminators in the Seoul-Gyunggi urban area. The results confirm that the proposed element is suitable for dual-band PCL systems in the VHF band compared to a conventional dipole antenna.

show abstract

Section: Mast Height (Hm) 8 M Reference Beammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Performance Prediction of a Dual-Band Coupled-Fed Dipole Array Antenna for PCL Systems in the VHF Band

2020

View full text Add to dashboard Cite

show abstract

“…For sake of convenience and without loss of generality, we consider the QI operator realizing a sum (in place of a mean) of the range and Doppler cell under test (CUT) over the N frames and M bistatic links. We explicitly point out that with such an assumption, the QI operator coincides with the ℒ detector in (25) by setting = 1 ∀ . First, the probability of false alarm ( ) for the LRT and QI operators to be used to compute the detection thresholds are presented.…”

Section: A Detection Performancementioning

confidence: 99%

“…However, the achievable dwells with such a configuration contrast with the requirement of long integration time, so that such a solution appears to be not feasible in the considered scenario. The second solution is exploiting an array receiver configuration (see for example [25], addressing a Fractional Fourier Transform-based technique for an array receiver exploiting low-power satellite illuminators), however this entails higher costs for the receiver development, partially compromising the cost-effectiveness of the proposed technology.…”

Section: Introductionmentioning

confidence: 99%

Joint Detection and Localization of Vessels at Sea With a GNSS-Based Multistatic Radar

Santi

Pieralice

Pastina

2019

IEEE Trans. Geosci. Remote Sensing

Self Cite

View full text Add to dashboard Cite

This paper addresses the exploitation of GNSS as opportunistic sources for the joint detection and localization of vessels at sea in a passive multistatic radar system. A single receiver mounted on a proper platform (e.g., a moored buoy) can collect the signals emitted by multiple navigation satellites and reflected from ship targets of interest. This paper puts forward a single-stage approach to jointly detect and localize the ship targets by making use of long integration times (tens of seconds) and properly exploiting the spatial diversity offered by such a configuration. A proper strategy is defined to form a long-time and multistatic range&Doppler (RD) map, where the total target power can be reinforced with respect to, in turn, the case in which the RD map is obtained over as a short dwell and the case in which a single transmitter is employed. The exploitation of both the long integration time and the multiple transmitters can greatly enhance the performance of the system, allowing counteracting the low power budget provided by the considered sources representing the main bottleneck of this technology. Moreover, the proposed singlestage approach can reach superior detection performance than a conventional two-stage process where peripheral decisions are taken at each bistatic link and subsequently the localization is achieved by multilateration methods. Theoretical and simulated performance analysis is proposed and also validated by means of experimental results considering Galileo transmitters and different types of targets of opportunity in different scenarios. Obtained results prove the effectiveness of the proposed method to provide detection and localization of ship targets of interest.

show abstract

“…In order to prevent the occurrence of unexpected events mentioned above, the dynamic information real-time acquisition of the surveillance area has become a very important issue. As an additional function of SAR system, the ground moving target detection (GMTD) for SAR system has become increasingly attractive [ 4 , 5 , 6 , 7 , 8 ]. With the development of SAR technology, bistatic SAR system can break through the limitations of conventional monostatic SAR and achieve high-resolution imaging of the forward-looking terrain of the receiver.…”

Section: Introductionmentioning

confidence: 99%

Bistatic Forward-Looking SAR Moving Target Detection Method Based on Joint Clutter Cancellation in Echo-Image Domain with Three Receiving Channels

Liu

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

In bistatic forward-looking synthetic aperture radar (BFSAR) ground moving target detection (GMTD), the suppression of the strong and heterogeneous ground clutter is one of the most crucial and challenging issues. Due to the bistatic forward-looking mode and long observation time, Doppler ambiguity, range and Doppler cells migration and non-stationary characteristics will exist in clutter receives, which leads to severe performance degradation of the traditional method. Hence, this paper proposes a GMTD method based on joint clutter cancellation in echo-image domain for BFSAR to achieve effective GMTD in heterogeneous BFSAR clutter. First, the pre-filtering and keystone transform are applied to suppress Doppler ambiguity and correct range cell migration, respectively. Then, time-division space-time adaptive clutter cancellation is adopted to suppress clutter at the first time in the echo domain, which can eliminate the effect of the migration of Doppler cells. However, its performance will be severely degraded due to the strong non-stationary characteristic of BFSAR clutter. Finally, adaptive displaced phase center antenna is exploited to suppress the residual non-stationary BFSAR clutter in image domain. Experimental results have shown that the strong non-stationary clutter of BFSAR has been sufficiently suppressed by the proposed method and the SCNR provided is enough to detect a moving target well.

show abstract

Passive Radar Array With Low-Power Satellite Illuminators Based on Fractional Fourier Transform

Cited by 32 publications

References 39 publications

Design and Performance Prediction of a Dual-Band Coupled-Fed Dipole Array Antenna for PCL Systems in the VHF Band

Design and Performance Prediction of a Dual-Band Coupled-Fed Dipole Array Antenna for PCL Systems in the VHF Band

Joint Detection and Localization of Vessels at Sea With a GNSS-Based Multistatic Radar

Bistatic Forward-Looking SAR Moving Target Detection Method Based on Joint Clutter Cancellation in Echo-Image Domain with Three Receiving Channels

Contact Info

Product

Resources

About