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In 3DICs heat dissipating devices are stacked directly on top of each other leading to a higher heat density than in a comparable 2D chip. 3D integration also moves the majority of active devices further away from the heatsink. This results in a degraded thermal path which makes it more challenging to remove heat from the active devices. Gradient HeatWave-3DIC was used to perform an appropriate 3D...
The range profile is redundant and disordered because the sample interval time is less than transmitted pulse width. The accurate estimation and optimization of the target range profile are essential for realizing the airborne microwave sensor detection system. In this paper, an algorithm for the real-time estimation and optimization of the target range profile due to over-sampling is presented for...
Comparing with traditional way of continue-wave RCS measurement system, high-resolution information is gained in stepped-frequency system. Using inverse fast Fourier transform, the frequency-domain data of the whole chamber obtained by testing is interpreted into high-resolution time-domain response, and the unwanted signals can be removed by adding a gating function. The measurement of finite frequency...
High resolution radar using linear frequency modulation (LFM) and non-linear frequency modulation (NLFM) transmit a wideband pulse to achieve a narrow range resolution. We consider digital multi-rate implementation of LFM and NLFM pulse compression. For the LFM case, we consider short-length fixed-point fast Fourier transform (FFT) within the multi-rate structure as a way to increase speed and reduce...
In this work, the continuous wavelet transform (CWT) is used to analyze periodic motions, measured by contactless Doppler radar, which have small amplitudes, drifting frequencies and dropouts. Using a classical method like fast Fourier transform (FFT) for periodic signals results in loss of the time behavior of the signal, drifting frequencies and dropouts, causing distortion in the frequency peaks...
High range resolution (HRR) is an important feature for radar, aiming at target classification. The range resolution is inversely proportional to the bandwidth of the transmitted signal. Pulse burst waveforms can achieve HRR at low expenses when the carrier frequency increases from one pulse to the next, stepping and synthesizing the wide bandwidth. In such a stepped frequency approach the resolution...
In this paper, the proposed technique can provide the range profile with adaptive range resolution for automotive frequency modulation continuous wave (FMCW radar.) For long-distance targets, the range is extracted with rough resolution using the basic FFT. The high resolution algorithm is used for near-distance targets, for which the collision probability is high.
In pulsed Doppler radar, the phase-coded signal is used to achieve high range resolution profiles. When the target radial velocity is high, linear range migration occurs. It results in the degradation of a long-term coherent integration. A novel coherent integration method of coherent phase-coded pulse train is proposed based on Keystone transform. In order to reduce the computation complexity, the...
Multicarrier phase-coded (MCPC) signals have been recently introduced to achieve high range resolution in radar systems. As in single carrier phase coded radars, the conventional method for compression of these signals is based on using matched filter or direct computation of the autocorrelation function. In the first part of this paper, we introduce a new method based on fast Fourier transform (FFT)...
Multicarrier Phase Coded signals have been recently introduced to achieve high range resolution in radar systems. As in single carrier phase coded radars, the conventional method for compression of these signals is based on using matched filter or indirect computation of an autocorrelation function. In this paper we propose a new method based on Fast Fourier Transform (FFT) that has lower computational...
An auto-recognition method of ship with low resolution radar is presented in the paper using multi transform technique. The radar target echo is sampled and preprocessed to suppress clutter first. Then characteristic vectors of the target are extracted with FFT transform, Mellin transform, wavelet transform and frame correlation processing. Experiments are carried out for the proposed method with...
A high-resolution surveillance and tracking radar has been recently developed and tested at the Institute of Radio Astronomy. The radar is a monopulse, all-weather radar with mechanical beam steering. It works in a pulse mode, and a coherent FFT-based signal processing is utilized. The radar is equipped with a clutter suppression system and with a Kalman filtering scheme for trajectory calculation...
In this paper, an automatic aircraft target recognition (ATR) framework is presented, which is based on the high resolution range profiles (HRRP) of aircraft targets. This work is divided into two major parts. First, we consider the generation of the HRRP, which includes the modeling and simulation of radar cross section (RCS), the design of step frequency waveform (SFW), and IFFT processing for HRRP...
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