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The paper deals with the azimuth estimation by passive coherent locator (PCL). PCL uses FM radio broadcasting in the VHF band. The amplitude monopulse, Bartlett method of direction of arrival and their combination are applied for the target azimuth estimation. The performance of these methods is presented on several simulations. Simulation results are validated by an outdoor measurement with mobile...
The paper deals with the model order estimation of a covariance matrix in the case of two coherent incoming signals on an antenna array. The paper also deals with the estimation of the angle of arrival (AoA). The used model order estimation techniques, are Minimum descriptive length (MDL), information theoretic criteria (AIC) and method which uses pseudo-spectrum of the direction of arrival (DoA)...
In this paper least mean squares methods application to ground clutter echoes suppression in bistatic radar systems are described. Tests of LMS and NLMS filters on real data are presented and their effectiveness for ground clutter echoes suppression is discussed. Finally it was found that the ground clutter echoes suppression effectiveness is highly deteriorated by ground clutter echoes presence in...
The paper deals with an angle of arrival (AoA) adaptive estimation in the case of coherent signals incident to an antenna array. The used methods are: forward/backward averaging and forward/backward spatial smoothing. The assumed signal model and mentioned methods are described and analysed. To prove the theoretical analysis measurements of a 4 element antenna array with an offline signal processing...
The precise and quick association of targets is one of the main challenging tasks in the signal processing field of the Multistatic Radar System (MRS). The paper deals with target association techniques based on the computation of the Probability Hypothetic Density (PHD) Function. The Computation time makes solving the PHD a very demanding task. The speedup of a newly developed algorithm depends on...
The paper deals with angular resolution of phased antenna arrays and with methods of better angular resolution based on spectral estimation in the case of two close targets. Angular resolution with continuous scanning is dependent mainly on the angle distance between two close targets. Angular resolution with electronic scanning is not dependent only on the distance between two close targets, but...
This paper describes an electronically scanned antenna array for a precision approach radar (PAR). Three antenna concepts are discussed and compared in terms of number of radiating and controlled elements, antenna gain and scanning time. Angular resolution for separated azimuth and elevation antennas with a monopuse method evaluation of the target angle in the case of two closely spaced targets is...
The paper describes a structure and parameters of a double cosecant squared antenna for a RFID system monitoring passing trains. The antenna at the 2.45 GHz ISM band covers uniformly an oblong area along a railroad track. The specific antenna radiation pattern enables to effectively use the radiated power. The antenna designed in microstrip technology consists of two mirror-oriented parts of the same...
The paper describes a workplace for the automatic measurement of the microwave antennas radiation patterns. The workspace consists of a designed rotary stage, a signal generator and a spectrum analyzer. The rotary stage, equipped with a stepper motor, is remote-controlled from a computer which provides not only accuracy but also comfort of measurement. The rotary stage is connected via a USB virtual...
The paper describes a double - dielectric layer S band high directivity coupler with a very low coupling (−40 dB and −60 dB) designed on microstrip transmission line technology. The four coupler ports are used as: one input, two outputs and one isolated port terminated by 50 Ω SMD resistor. The directivity coupler consists of two substrates with a common ground plane and with microstrips situated...
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