Analysis of the digital MTI filter with random PRI

Vergara, Luis

doi:10.1049/ip-f-2.1993.0018

Cited by 22 publications

(6 citation statements)

References 11 publications

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“…To combat the strong stationary clutter signals, a moving target indication (MTI) filter is used to cancel the clutter signal [ 25 , 32 , 33 , 34 , 35 ]. When the system uses a uniform pulse repetition interval (PRI), the system experiences significant signal to noise ratio (SNR) drops in the radar blind speed zone [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

A Signal Processing Algorithm of Two-Phase Staggered PRI and Slow Time Signal Integration for MTI Triangular FMCW Multi-Target Tracking Radars

Tang

Elangage

2021

Sensors

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In this paper, a novel signal processing algorithm for mitigating the radar blind speed problem of moving target indication (MTI) for frequency modulated continuous wave (FMCW) multi-target tracking radars is proposed. A two-phase staggered pulse repetition interval (PRI) solution is introduced to the FMCW radar system. It is implemented as a time-varying MTI filter using twice the hardware resources as compared to a uniform PRI MTI filter. The two-phase staggered PRI FMCW waveform is still periodic with a little more than twice the period of the uniform PRI radar. We also propose a slow time signal integration scheme for the radar detector using the post-fast Fourier transformation Doppler tracking loop. This scheme introduces 4.77 dB of extra signal processing gain to the signal before the radar detector compared with the original uniform PRI FMCW radar. The validation of the algorithm is done on the field programmable logic array in the loop test bed, which accurately models and emulates the target movement, line of sight propagation and radar signal processing. A simulation run of tracking 16 s of the target movement near or at the radar blind speed shows that the total degradation from the raw post-fast Fourier transformation received signal to noise ratio is about 2 dB. With a 20 dB post-processing signal to noise ratio of the proposed algorithm for the moving target at around a 20 km range and with about a −3.5 dB m2 radar cross section at a 1.5 GHz carrier frequency, the tracking errors of the two-dimensional angles with a 4×4 digital phased array are less than 0.2 degree. The range tracking error is about 28 m.

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Section: Introductionmentioning

confidence: 99%

A Signal Processing Algorithm of Two-Phase Staggered PRI and Slow Time Signal Integration for MTI Triangular FMCW Multi-Target Tracking Radars

Tang

Elangage

2021

Sensors

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“…Therefore, the random PRI (RPRI) radar, which has already been alluded to in the past [7][8][9][10] for smearing the ambiguity peaks, is also a candidate for wideband imaging of fast rotating targets. However, due to uncertainty principle in RPRI signal processing, the nonparametric approaches such as CBP suffer from global leakage problems, which will lead to high sidelobe pedestal.…”

Section: Introductionmentioning

confidence: 99%

High Resolution Wideband Imaging of Fast Rotating Targets Based on Random Pri Radar

Liu¹,

Chen²,

Sui³

2018

PIER M

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Abstract-By exploiting the micro-motion features of fast rotating targets, wideband radar has been successfully applied to high resolution imaging. However, due to the traditional fixed pulse repetition interval (PRI), the target image may suffer from aliasing in some practical situations. In this paper, under the compressed sensing (CS) radar framework, an efficient wideband imaging scheme with random PRI signal is introduced for aliasing reduction. Considering that direct application of the CS theory will result in large-scale dictionaries and high computational complexity, we firstly generate a low resolution image by applying modified generalized Radon transform on range-slow time domain and then scale down the dictionary column by reserving the atoms corresponding to those strong scattering areas. Simulation results show that this scheme can achieve aliasing-free images with acceptable computational cost.

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“…Motivated by the random pulse repetition interval (PRI) technique applied in pulse Doppler (PD) radar [18][19][20], in this paper, we develop a randomly jittered chirp sequence waveform for FMCW radar. As for PD radar, random PRI waveform and jittered PRI waveform have been developed for anti-interference and ambiguity-resolving purposes.…”

Section: Introductionmentioning

confidence: 99%

Jittered chirp sequence waveform in combination with CS‐based unambiguous Doppler processing for automotive frequency‐modulated continuous wave radar

Wang

Zhang

et al. 2017

IET Radar Sonar & Navi

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The chirp sequence waveform is one of the most commonly used waveforms for automotive frequency-modulated continuous wave radars. When a chirp sequence waveform is applied, the range-Doppler processing method based on twodimensional fast Fourier transform can be used to extract the range and velocity parameters of multiple targets from the beat signals. However, conventional chirp sequence waveforms suffer from the Doppler ambiguity problem, which results in ambiguities in velocity measurement. In this study, the authors propose a novel jittered chirp sequence waveform. In the proposed waveform, the initial times of the chirps are randomly jittered. According to the compressed sensing theory, they establish the parameter design principle for the new waveform, and apply sparse recovery method to achieve unambiguous Doppler processing. Subspace pursuit algorithm is recommended as the suitable sparse recovery method for Doppler processing due to its low complexity and stable recovery performance. The effectiveness of the proposed waveform and its corresponding signal processing method are verified by simulation and experimental results.

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Analysis of the digital MTI filter with random PRI

Cited by 22 publications

References 11 publications

A Signal Processing Algorithm of Two-Phase Staggered PRI and Slow Time Signal Integration for MTI Triangular FMCW Multi-Target Tracking Radars

A Signal Processing Algorithm of Two-Phase Staggered PRI and Slow Time Signal Integration for MTI Triangular FMCW Multi-Target Tracking Radars

High Resolution Wideband Imaging of Fast Rotating Targets Based on Random Pri Radar

Jittered chirp sequence waveform in combination with CS‐based unambiguous Doppler processing for automotive frequency‐modulated continuous wave radar

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