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In through-the-wall target localization area, wall effect including absorption and refraction will arise, wall effect needs to be compensated. If wall parameters including thickness and dielectric constant are exactly known, the target can be compensated to its correct position. In this paper, based on the transmitting model of through-the-wall radar, we deduced the Cramer-Rao lower bound (CRLB) of...
The operational performance of 1030/1090MHz aeronautical radio system is required to be estimated whether or not they will interfere harmfully with each other by sharing the frequency band. The performance of these systems will be estimated with some interference measures such as the received pulse densities. This paper provides the results of an analysis of 1090MHz signal environment which recorded...
Increased demand for wireless services has spurred research into spectrum co-existence between radar and communication systems. The effect of an unaltered radar interference on an uncoded communication receiver has been investigated for constellations used in commercial systems. However, the constellation design — possible for a cognitive transmitter-receiver pair — that maximizes the transmission...
Citizen Broadband Radio Service band (3550–3700 GHz) is seen as one of the key frequency bands to enable improvements in the performance of wireless broadband and cellular systems. A careful study of interference caused by a secondary cellular communication system coexisting with an incumbent naval radar is required to establish a pragmatic protection distance, which not only protects the incumbent...
We propose a dual-band linear frequency-modulated continuous wave (LFMCW) radar receiver based on a microwave photonic in-phase and quadrature (I/Q) mixer, able to simultaneously operate on two different bands over a very board frequency range. The sharing of hardware resources and joint processing of dual bands are implemented by applying a special dual-band sensing waveform. An unambiguous and independent...
This paper proposed a low probability of identification (LPID) radar signal parameter interval design method to control recognition probability in intercept receiver. The method introduced in this paper use identification capacity theory to study recognition process in intercept receiver. The relationship between identification capacity and error recognition probability is established. Then, the radiation...
The baseband and intermediate frequency (IF) frequency modulated continuous wave (FMCW) radar receiver topologies are compared on the bases of receiver nonlinearity, time domain interferometry, receiver noise and demodulator port isolation. It is shown that an IF receiver is capable of suppressing distortions, where the same nonlinearity would result in a baseband (or zero-IF) receiver detecting false...
To date, remote metering devices (electricity, gas, water and heat) operating in the 800 MHz band (862–869 MHz) are used either by IoT providers or by metering service providers to determine the energy etc. consumption in private houses from the outside without the need to enter the building. Meters can be integrating as simple LoRaWAN device transmitters connected to a central database by base stations...
This paper reflects the results of developed sync system investigation, which is based on optimal receiver by average risk minimum criterion. This receiver is intended to detect the reflected radar impulse under conditions of Gaussian and Johnson noises. During a digital experiment we used M-sequence with single pulse phase-shift keying as a reference signal. The use of a developed self-tuning system...
As the need to satisfy the global demand for wireless services continues, the pressure for valuable spectrum adjacent to radiolocation services is a topic of contention between incumbent spectrum users and national spectrum policy makers and regulators. The study of the coexistence of radar systems and modern LTE communications systems tend to focus on the measurements of the spectrum impacts of the...
For some students, learning signal processing could sometimes be a bit complicated due to the importance of the mathematical background that underlies this field. In this paper, we present two real-life experiments that allows to introduce, in a very natural way, most of the standard tools of signal processing. This teaching, aimed at undergraduate students, is divided in two parts. One exploiting...
We introduce a new scheme that integrates the Time Compression OverLap-Add (TC-OLA) spread spectrum technique into radar systems, more specifically the Linear Frequency Modulation Pulse Compression (LFM-PC) radar. This technique increases the signal to noise ratio (SNR) and, as a consequence, enables a greater processing gain compared to the traditional radar LFM-PC systems. In addition, TC-OLA allows...
In the United States, government and commercial entities have begun sharing the 3550–3650 MHz military Radar band. The key to ensuring successful sharing is robust interference prediction based on accurate and reliable propagation models. This paper presents the results of a comprehensive propagation measurement and modeling campaign for the 3.5 GHz band. Although existing propagation models are broadly...
We developed a SFCW sparse array radar system for 3D imaging, which consists from 16 transmitters and 16 receivers and operates at the frequency range from 270MHz to 8GHz. The 2D antenna array layout was optimized using the middle point approximation. Several image reconstruction methods, which include the least square, Compressive Sampling Matching Pursuit and Regularized Orthogonal Matching Pursuit...
We present a three-dimensional scheme that can be used to compute the electromagnetic impulse response between any two subsurface points from surface reflection data measured at a single surface of a lossless medium. The scheme first computes a virtual vertical radar profile using the Marchenko scheme from which focusing wavefields are computed. With the aid of the Green's functions of the virtual...
Mismatched processing of codes with multi-range resolution is revisited. The inverse of a binary code's spectrum is used as the transfer function of the mismatched filter. We calculate the mismatch losses for all combinations of binary codes in the range of code length L≤25 and find codes with very small mismatch loss compared with those of the conventional codes. The Doppler characteristics for various...
In this paper we propose a novel approach to joint radar-communication waveform design with low probability of intercept characteristics. The data are encoded onto a certain parameter of a particular random distribution; using this distribution, random sequences are generated, which become amplitude weights for the orthogonal frequency division multiplexing (OFDM) sub-carriers. We assume and describe...
Radar sensors become typical components for automotive driver assistance systems and autonomous driving. The widespread use of this sensor type leads to an increasing risk of unwanted interferences. Those interferences can severely degrade the detection performance and cause sensor blindness. To overcome this problem, this paper describes a method to estimate and remove interfering signals in data...
The capability of discriminating radar targets exhibiting multiple moving parts has become of great interest for both aerospace and ground-based target recognition and analysis. In particular, helicopters and other targets with rotors, as for instance miniature Unmanned Aerial Vehicles, exhibit peculiar characteristics in the radar return that can be used for their recognition. In this paper a novel...
This paper presents the preliminary results of a new study aimed at minimizing the crosstalk effect in the receiver of a frequency-modulated radar. The main idea consists of performing a calibration of the system in absence of targets by analyzing the intermediate-frequency signal at the output of the radar receiver to compute a variable threshold according to the crosstalk amplitude. An electromagnetic...
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