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The polarization state of the radar antenna is slow changed, which makes the radar can estimate the polarization parameters of the signal. This paper presents a new method based on the observation equation by least squares method, considering the radar observation equation of antenna polarization matrix is built in the complex domain, we puts forward a transformation method to realize real coefficient...
The paper addresses a problem of ballistic object trajectory estimation on the basis of measurements from a cinetheodolite electro-optical tracking system. The object flight dynamics is modeled using a three degrees of freedom equations of motion. The estimation of object trajectory is performed with the use of an Extended Kalman Filter.
One of the most fundamental tasks in autonomous driving is the recognition of the road ahead. Using radar data, this is usually done via rule based algorithms. This paper proposes a deep learning approach to estimate the course of the ego lane based on occupancy grids generated by radar sensors. The method is also able to simultaneously give a reliability measurement of the predicted driving path...
Purpose of the paper is to present a solution for the target height estimation problem for multi-frequency multi-static passive radar. Aim of the proposed estimation strategy is to provide 2D passive sensors, which measure only bistatic range and Doppler, with target height estimation capability via the simultaneous exploitation of multiple FM transmitters (88–108 MHz). Results achieved with simulated...
In this paper, we propose a novel array interpolation method in logarithmic domain for enhanced direction of arrival (DOA) estimation. Array interpolation techniques are broadly utilized in the DOA estimation for achieving better angular resolution. Generally, to generate interpolated array elements from original array elements, the method of linear least squares (LLS) has been used. When we use the...
This paper presents a study of MUSIC algorithm for a nonuniform linear array (NLA) with different configurations. In the case of the same number of sensors, the element spacing of each configuration is selected according to the condition of the Chinese surplus theorem. In the simulation, we provide simulations of three typical NLA configurations for the different aperture of the array in comparison...
A new radar system, Sinusoidal Frequency Modulated Continuous Wave radar is used to estimate azimuth angles of radar targets. It overcomes the defect that the Linear Frequency Modulated Continuous Wave radar fails to determine the azimuth angles of multiple targets at the same distance simultaneously. However, it is more difficult to estimate azimuth angles from this complicated radar echoes than...
The article deals with the current situation of histogram use. The overwhelming majority of ELINT systems apply histogram depiction in their analytic displays. A significant majority of distinguished radar signals experts use this advantageous function. This contribution shows a breakthrough approach in histogram description via a Gaussian function. Specific sections are aimed at the creation of a...
In an automotive environment the presence of reflecting surfaces cannot be avoided. The electromagnetic wave returning from a target vehicle can get reflected on those surfaces causing a non existing so-called ghost target. For driver assistance systems ghost targets can lead to false decisions and, therefore, they should be detected and avoided. In this paper a model for describing those ghost targets...
In this paper we analyze the shape reproduction errors of continuous spectrum of random Gaussian process (particularly, echo signals from meteorological formations in pulse Doppler weather radar) using various spectral estimation (SE) methods in “adaptive” situation when a priori unknown covariance matrix (CM) is replaced with its estimates of different kind. We also show the significant robustness...
Amplitude and phase imbalance (IQ imbalance) seriously degrades the performance of FMCW radar systems with quadrature demodulator. The non-ideality of the radar signals has two main effects: The single-channel IQ imbalance leads to an image peak in the FMCW spectrum, resulting in wrong detections. The IQ imbalance between channels affects the direction-of-arrival (DOA) estimation, as the array manifold...
The focus of this paper is on the estimation of the velocity of moving targets with a Forward Scatter Radar system. To this aim a two-dimensional filter bank is proposed with the generic filter impulse response depending on the target electrical size and on the target trajectory that are a priori unknown. In order to limit the computational load required by the bank for practical applications, a two-step...
A new clutter-map constant false alarm rate (CFAR) detection algorithm for log-normal distribution is proposed. A combination of two recursive estimators (dual estimators) is considered for the estimation of the mean and standard deviation of the log-normal interference. Compared with the estimation method based on digital exponential filtering technique, the dual estimators converge faster while...
The detection performance of a passive radar systems is generally determined by the received reference and surveillance signals purity. In recent times a number of interference cancellation techniques have been researched to deal with the disturbances on the surveillance channel. The variety of different methods operate in the space, time and frequency domains with having different implementations...
With the increasing complexity of the surrounding maritime situation, the high resolution imaging of ship targets has become a hot topic again in recent years. The optimal time selection based imaging is an effective approach for ship ISAR imaging. In this paper, two optimal time selection based imaging methods for ship targets, which use an improved Doppler Spread (DS) estimation and the Doppler...
The highly limited number of observation results in the increase of the prediction errors. In such case the linear Kalman filter (KF) will work within the unsteady state, which can lead to unpredictable results. The paper presents an alternative, simplified methods for the tracked object position prediction with the linearization of the trajectory. The obtained results are compared with the KF predictions...
This paper describes a method of separation (degarbling) of individual Secondary Surveillance Radar replies from a mixture (garble) received using a multi-channel antenna system. The aim of described method is to increase the number of correctly decoded messages used for aircraft surveillance by Air-Traffic Control center. Firstly, described method is evaluated on the model data simulation and afterwards...
In the past period, great efforts have been made to develop methods for the people detection based on monitoring their respiratory motion using ultrawideband (UWB) radar. The basic principle of the respiratory motion detection consists in the identification of sensor signal components possessing a significant power in the frequency band 0.1–0.7 Hz (frequency band of human respiratory rate) corresponding...
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