This paper presents a false alarm analysis of the cell-averaging-trimmed-mean constant false alarm rate (CATM-CFAR) detector in the presence of clutter edge. Structure of the CATM-CFAR detector is described briefly. Detection curves for... more
This paper presents a false alarm analysis of the cell-averaging-trimmed-mean constant false alarm rate (CATM-CFAR) detector in the presence of clutter edge. Structure of the CATM-CFAR detector is described briefly. Detection curves for optimal, CATM, cell-averaging (CA), trimmed-mean (TM) and ordered-statistic (OS) CFAR detectors has been analyzed and compared for desired probability of false alarm and determined size of the reference window. False alarm analysis of the CATM-CFAR in case of clutter with constant clutter-to-noise ratio has been conducted. Also, comparative false alarm analysis of CATM and some of well known CFAR detectors is carried out and results are presented.
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In this paper, we consider received radar echoes data of moving ground targets and represent the corresponding signals in the time-frequency domain using spectrograms. The objective of the paper is to identify and validate the intrinsic... more
In this paper, we consider received radar echoes data of moving ground targets and represent the corresponding signals in the time-frequency domain using spectrograms. The objective of the paper is to identify and validate the intrinsic spectrogram-based features characterizing the different classes of targets, and subsequently extract salient features for classification. We will show examples on Radar Echoes Database, containing radar echoes from various targets.
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In this paper is presented the practical realization of functional model of software radar receiver on the PXI platform. All blocks after IQ demodulator and ending with display are programmed in MATLAB® software, then projected in Lab... more
In this paper is presented the practical realization of functional model of software radar receiver on the PXI platform. All blocks after IQ demodulator and ending with display are programmed in MATLAB® software, then projected in Lab VIEW and at the end implemented on the PXI platform. Realization of the processing of radar signals in real time is presented. Comparative analysis of the results of target detection of one real radar device and realized functional model on the appropriate hardware components is shown.
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This paper presents a new model of the Nonlinear Fusion Constant False Alarm Rate detector. Mentioned detector is some kind of modification of fusion CFAR detector. Also, it is implemented in the receiver of the software defined radar.... more
This paper presents a new model of the Nonlinear Fusion Constant False Alarm Rate detector. Mentioned detector is some kind of modification of fusion CFAR detector. Also, it is implemented in the receiver of the software defined radar. Approach of this new detector is based on parallel operation of three well-known types of CFAR detectors: Cell Averaging, Ordered Statistic and the Trimmed Mean CFAR. In this case probability of false alarm rate has not the same value in each single CFAR algorithm, as it was in the realization of linear fusion CFAR detector before. The aim of this work is elimination of the largest possible number of false targets with the least possible disruption of the probability of detection of real radar targets. The paper presents detection of real radar targets in real clutter. Also, we will compare the characteristics of nonlinear with linear fusion CFAR detector.
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In this paper we describe a database, noted as RadEch Database, containing radar echoes from various targets. The data has been collected in controlled test environments at the premises of Military Academy - Republic of Serbia. Our goal... more
In this paper we describe a database, noted as RadEch Database, containing radar echoes from various targets. The data has been collected in controlled test environments at the premises of Military Academy - Republic of Serbia. Our goal is to provide a balanced and comprehensive database to enable reproducible research results in the field of classification of ground moving targets
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The fuzzy logic approach to the automatic classification of moving target detected by ground surveillance radar is presented in this paper. The real audio Doppler signatures of various targets are analyzed by spectrogram. As a result of... more
The fuzzy logic approach to the automatic classification of moving target detected by ground surveillance radar is presented in this paper. The real audio Doppler signatures of various targets are analyzed by spectrogram. As a result of analysis, input and output variables with corresponding membership function are defined. The set of fuzzy rules is established. The defuzzification of the output
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A hardware architecture that implements a CFAR processor including six variants of the CFAR algorithm based on linear and nonlinear operations for radar applications is presented. Since some implemented CFAR algorithms require sorting the... more
A hardware architecture that implements a CFAR processor including six variants of the CFAR algorithm based on linear and nonlinear operations for radar applications is presented. Since some implemented CFAR algorithms require sorting the input samples, the two sorting solutions are investigated. The first one is iterative, and it is suitable when incoming data clock is several times less than sorting clock. The second sorter is very fast by exploiting a high degree of parallelism. The architecture is on-line reconfigurable both in terms of CFAR method and in terms of the number of reference and guard cells. The architecture was developed for coherent radar with pulse compression. Besides dealing with sur-face clutter and multiple target situations, such radar de-tector is often faced with high side-lobes at the compres-sion filter output when strong target presents in his sight. The results of implementing the architecture on a Field Programmable Gate Array (FPGA) are presented and...
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The Envelope Constrained Filter (ECF) concept seems to be a useful tool in filter response shaping applications. There are several applications in radar techniques where the ECF concept can be utilised, such as the range sidelobe... more
The Envelope Constrained Filter (ECF) concept seems to be a useful tool in filter response shaping applications. There are several applications in radar techniques where the ECF concept can be utilised, such as the range sidelobe suppression in the receiver filter design or the antenna pattern sidelobe suppression in the antenna design. However, the nonfeasible solution case is almost always encountered with these applications. Moreover, a minimax feature of the filter designed is desired then. The original algorithms did not prove successful in such a scenario. The paper presents a novel approach to the ECF design, the main feature of which is the minimax behaviour in the nonfeasible solution case.
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The design procedure for a self-clutter suppression filter by the modified recursive least square method is presented. The main advantage of this approach is the possibility to compromise between two criteria: the peak sidelobe level and... more
The design procedure for a self-clutter suppression filter by the modified recursive least square method is presented. The main advantage of this approach is the possibility to compromise between two criteria: the peak sidelobe level and mean square sidelobe level
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A new approach is proposed to envelope constrained filter (ECF) design. The new approach utilizes the minimax algorithms, originally developed for sidelobe suppression in radar applications. The new approach has been compared to the... more
A new approach is proposed to envelope constrained filter (ECF) design. The new approach utilizes the minimax algorithms, originally developed for sidelobe suppression in radar applications. The new approach has been compared to the conventional approach, which utilizes the tools of nonlinear programming. The comparative analysis shows that the new approach promises a better performance in the nonfeasible solution scenario
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We present a radar ambiguity function that accurately describes the operation of the compressive receiver. The most important benefit of this approach is the possibility of the application of radar signal design methods for ambiguity... more
We present a radar ambiguity function that accurately describes the operation of the compressive receiver. The most important benefit of this approach is the possibility of the application of radar signal design methods for ambiguity function shaping in the field of compressive receivers. Results in ambiguity function shaping are also presented. We successfully designed a compression filter which suppresses sidelobes
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This paper analyses the possibility of using the modified recursive method of least squares as a transversal filter coefficients evaluation algorithm which is efficient in self-clutter suppression for phase-coded radar signals. The... more
This paper analyses the possibility of using the modified recursive method of least squares as a transversal filter coefficients evaluation algorithm which is efficient in self-clutter suppression for phase-coded radar signals. The obtained results are compared with the best results reported in solving this problem, obtained by using iterative reweighted least squares (IRLS) procedure
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In this paper a comparative analysis of sidelobe levels at matched and mismatched filters depending on input signal-to-noise ratio is presented. The analysis was performed for various types of sequences. The sidelobe level of the... more
In this paper a comparative analysis of sidelobe levels at matched and mismatched filters depending on input signal-to-noise ratio is presented. The analysis was performed for various types of sequences. The sidelobe level of the mismatched filter output is lower than the sidelobe level of the matched filter output up to some threshold level of the input signal SNR value.
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Eclipse effect analysis is performed for the chirp radar using the chirp signal ambiguity function. A new approach to sidelobe suppression for the radar compression filter response is proposed, which enables better detection and tracking... more
Eclipse effect analysis is performed for the chirp radar using the chirp signal ambiguity function. A new approach to sidelobe suppression for the radar compression filter response is proposed, which enables better detection and tracking of the targets within the eclipsing zone
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Digital radio communications in the heavily distorted indoor environment are limited by the communication channel characteristics. We propose a new method for self intersymbol interference reduction in chirp spread spectrum (SS) systems.... more
Digital radio communications in the heavily distorted indoor environment are limited by the communication channel characteristics. We propose a new method for self intersymbol interference reduction in chirp spread spectrum (SS) systems. The method is based on the design of compression filters with low sidelobes and preserved mainlobe width
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Eclipse effect analysis is performed for the chirp radar using the chirp signal ambiguity function. A new approach to sidelobe suppression for the radar compression filter response is proposed, which enables better detection and tracking... more
Eclipse effect analysis is performed for the chirp radar using the chirp signal ambiguity function. A new approach to sidelobe suppression for the radar compression filter response is proposed, which enables better detection and tracking of the targets within the eclipsing zone
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ABSTRACT To increase maximum radar range, determined with effective radiated energy, pulse duration has to be expanded. However, a larger pulse increases the blind zone, i.e. the eclipsing effect is greater than before. The analysis given... more
ABSTRACT To increase maximum radar range, determined with effective radiated energy, pulse duration has to be expanded. However, a larger pulse increases the blind zone, i.e. the eclipsing effect is greater than before. The analysis given in this paper deals with the eclipsing effect on the receiver response in case of a phase coded train of various duration pulses. The Barker biphase sequence and P3 polyphase sequence are used as coding sequences.
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A microscan receiver (MR) algorithm for compression filter design with reduced sidelobes and controlled resolution is proposed. The basis for the new approach is the introduction of cross-ambiguity function in MR operation interpretation.... more
A microscan receiver (MR) algorithm for compression filter design with reduced sidelobes and controlled resolution is proposed. The basis for the new approach is the introduction of cross-ambiguity function in MR operation interpretation. Utilization of the DIRLS (Doppler optimized iteractive reweighted least square) algorithm is proposed for solving the sidelobe problem
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ABSTRACT A new approach to envelope constrained filter (ECF) design is proposed, based on utilization of minimax algorithms originally developed for mismatched filter design in radar applications. The conventional and the new approach... more
ABSTRACT A new approach to envelope constrained filter (ECF) design is proposed, based on utilization of minimax algorithms originally developed for mismatched filter design in radar applications. The conventional and the new approach have been compared both in sidelobe suppression and in ECF design. The results of comparison show that the new approach is successful in ECF design, while the conventional approach is not successful in sidelobe suppression
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Publication in the conference proceedings of EUSIPCO, Rhodes, Greece, 1998