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Passive geolocation of a skywave HF source requires accurate estimation of azimuth and elevation angles together with correct ionospheric modeling. Arrays of polarimetric vector sensors have been proposed to reduce the array aperture required for this purpose. However, several factors complicate their application including magneto-ionic raymode splitting resulting in closely-spaced arrivals in both...
Multistatic Velocity Backprojection (MVBP) is a technique for visualizing multistatic radar data using bistatic range and Doppler information and facilitates the localization of moving targets in a common reference frame. In this paper simulated and experimental passive multistatic radar data are processed using either traditional range-Doppler processing or, in the case of velocity ambiguous targets...
In this paper, a new moment-based method is proposed to estimate jointly the delay and Doppler of a radar signal in the presence of time jitter. This approach diminishes the effect of the jitter existed in the received signal. Thus, it is capable of specifying the delay and Doppler more precisely in comparison with other rival methods. The proposed method is able to predict the power of the noise...
With the goal of developing a dynamic, time-domain, simulation tool, different techniques for predicting the complex scattered electromagnetic fields are examined. Emphasis is placed upon evaluating the ability of certain RCS prediction methods to produce a high fidelity model of the static phase relationships of scattering mechanisms of a complex scattering body. Future exploration will focus on...
In the paper bistatic noise radar is considered. The concept of such a radar is verified with a demonstrator. The demonstrator consists of physically separated transmitter and receiver, therefore a bistatic geometry is created. Reference signal used for correlation processing is generated locally in the receiver. Coarse synchronization in time and frequency between the transmitter and receiver is...
An Over-The-Horizon Radar (OTHR) has been deployed near Ottawa, Canada. The radar is aimed northward and collects auroral echoes through line-of-sight propagation and ground echoes from beyond the horizon through ionospheric reflection. These echoes have been resolved in the three spatial dimensions of range, azimuth, and elevation, as well as in the temporal dimension of Doppler. It is shown that...
The high azimuth angular resolution problem of real-beam scanning radar is significant to targets detection and location. ML iterative adaptive approach(ML-IAA) has been used in array signal processing to realize high angular resolution. In order to improve the azimuth angular resolution of real-beam scanning radar, we introduce this algorithm to real-beam radar system, called real-beam ML iterative...
In this paper, a novel simplified architecture of inter-channel code division multiplexing (IC-CDM) for radar receiver is presented. This architecture uses multi-phase code to distinguish different channels from the aggregate signal, so that all array elements can share one set of signal processor instead of such a device on each element in the previous technology. In this paper, a computer simulation...
This paper considers a radar system capable of adaptively adjusting its transmitted waveform, by which the system is able to dynamically mitigate the interference of the clutter, thus improve the detection performance. The key feature of the adaptive mechanism is the optimum waveform design, which is a complex multi-dimension optimizing problem and such a problem in this particular application has...
This paper addresses the problem of speckle covariance matrix estimation for Compound-Gaussian clutter. The speckle component is modeled as a low order autoregressive (AR) process. We derive the AR coefficients conditioned Likelihood function of the secondary data and propose an iterative approach for the optimizing problem under the criteria of Maximum-Likelihood (ML). We evaluate the performance...
Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
The use of passive radar to exploit the vast numbers of wireless transmitters of opportunity in today's congested signal environments has the potential to be a high impact technology with global reach. However the computationally demanding processing associated with high sample rate cross correlation and interference suppression have resulted in lab systems where the data are recorded in-situ, and...
This paper considers the coherent integration detection problem for high speed maneuvering target with a constant jerk, and proposes a new coherent integration detection method involves Keystone transform (KT) and cubic phase function (CPF). Specifically, it employs KT to correct the effect of the range migration. Then, the estimates of the acceleration and jerk with CPF are obtained to compensate...
This paper presents a study of an improved SubImage based variants of the time domain Synthetic Aperture Radar (SAR) algorithm Fast Factorized Backprojection (FFBP). Sub-Image FFBP based on Optimal Regional Partition (ORP) (SIFFBP-ORP) algorithm is proposed by analyzing the regional division constraints. It provides a way to solve the acceleration-decline problem of the conventional SIFFBP algorithm...
We are motivated to exploit advances in digital radar technology and super-resolution techniques to improve current radar search-and-track functions. In this paper, we focus on the benefits of using digital beamforming for enhancing angle estimation capabilities. These capabilities include flexibility in monopulse processing, using multiple simultaneous beams to extend angle coverage and resolving...
The need for localizing multiple main-beam targets in the presence of interference, clutter and jammers arises in scenarios such as: air defense, where a radar detection may correspond to one or multiple targets (e.g., a missile launched from an airborne platform); ballistic missile defense, where the incoming missile complex involves a large number of objects; cruise missile defense for low angle...
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