This paper develops a transmit (Tx) waveform de- sign technique for dual-function radar-communication systems that provide both multiple-input multiple-output (MIMO) radar and multi-user single-output (MU-MISO) com- munication functionalities. We propose hybrid linear-nonlinear precoding (HLNP) signaling scheme, in which the dual-use is superposition of linearly-precoded communica- tion symbols nonlinearly-precoded improves performance. To attain good Tx beampattern ambiguity properties, we...

Unlike the conventional phased array, frequency-diverse array (FDA) employs a tiny frequency increment across elements, which is capable of providing range–angle–time-dependent beampattern, and thereby offers potential benefits in target localization interference mitigation. Reported literature on FDA mostly focuses its intrapulse (fast-time) property ignores interpulse (slow-time) feature induced by offset. In this article, incorporating neglected inherent slow-time coding feature, novel...

As a wideband radar system, synthetic aperture (SAR) may conflict with several electromagnetic systems, such as frequency modulation (FM), TV, and other communication systems. These signals, termed radio interference (RFI), severely interfere SAR systems from generating high-resolution image. Numerous previous researches focused on the RFI suppression problem, among which semiparametric methods have been verified to state-of-the-art performance. However, most of are computationally expensive...

Traditional phased array-based space-time adaptive processing (STAP) suffers from severe performance degradation in the presence of dense false-target jamming, especially mainlobe deceptive jamming. In this paper, an enhanced 3-D joint domain localized STAP method, incorporated with jamming pre-whitening transmit-receive spatial domain, is proposed to deal problem. It exploits characteristic that target, clutter, and are discriminable range-angle-Doppler a frequency diverse array multi-input...

Synthetic aperture radar (SAR), as a wideband system, may be subject to strong interferences with variety of signals. The narrowband interference (NBI) exemplifies the most typical its kind, such form radio frequency (RFI). With development SAR imaging technology, high-resolution wide-swath (HRWS) imagery technology now reaches maturity finally take shape in current systems. To obtain HRWS images, multichannel (MC-SAR) system has been employed tackle contradictory requirements for both high...

In this work, we consider the problem of joint sparse array antenna design and phase-only beampattern shaping with reconfigurability. Our objective is to reduce cost system for unmanned aerial vehicle (UAV) radar a large-aperture array. We formulate co-design as optimization angular response binary-like modulus constraints. To solve resultant NP-hard nonconvex problem, propose consensus alternating direction method multipliers (ADMM) based algorithm. This transforms original into...

In order to play the key role of automotive millimeter wave radar in intelligent vehicle systems, direction-of-arrival (DOA) estimation is an essential problem be solved. For practical driving applications, DOA requires both real-time performance and high accuracy. Due unique advantages, deep learning (DL) based methods have attracted more attention. Most existing DL-based require a large number snapshots, but only few snapshots can guaranteed applications. Moreover, they usually model as...

Clutter suppression is a challenging problem in non‐side‐looking airborne radar (NSLAR) because of the range‐dependent clutter. It more intractable when NSLAR operates at high pulse repetition frequency (HPRF). In this study, cascaded algorithm presented to realise clutter for with HPRF. A novel orthogonal‐waveform‐based elevation adaptive beamforming method proposed suppress near‐range first stage, and residual range‐independent far‐range suppressed by azimuth‐Doppler space‐time processing...

In this paper, a more generalized dilated nested array (DNA) named multi-level (multi-level DNA), which further extends the original DNA to general situation and improves direction of arrival (DOA) estimation performance, is proposed. The DNA, consists time-shifted array, possesses capabilities handling sources achieving improved accuracy compared with array. However, only one employed in performance improvement quite limited. Here, new utilizes multiple arrays, can provide degrees freedom...

Currently, the frequency-modulated continuous-wave (FMCW) millimeter-wave (MMW) radar is a typical choice for automotive and transportation systems. As number of FMCW radars explodes in current vehicle market working frequency limited an open window 76–81 GHz, on road easily mutually interfere with each other, especially due to their wide bandwidth. Hence, this article, we rigorously analyze target echo, i.e., beat signal, sparsity interference signal time domain, row useful echo domain. By...

In this paper, a new sparse array structure, which further improves the degrees of freedom (DOFs) and enhanced DOA estimation performance, for fourth-order cumulant based direction arrival (DOA) is proposed. The new-formed hole-free can achieve large consecutive range in its difference coarray. By analyzing second-order sum coarray coarray, closed form expression physical sensor locations corresponding virtual configurations are derived. Compared with existing structures, such as FLNA...

Object detection in remote sensing images (RSIs) is one of the basic tasks field image automatic interpretation. In recent years, deep object frameworks natural scene (NSIs) have been introduced into on RSIs, and performance has improved significantly because powerful feature representation. However, there are still many challenges concerning particularities objects. One main missed small objects which less than five percent pixels big Generally, existing algorithms choose to deal with this...

Moving target detection is one of the most important tasks radar systems. The clutter echo received by usually strong and heterogeneous when works in a complex terrain environment, resulting performance degradation moving detection. Utilizing prior knowledge distribution space–time domain, this paper proposes novel network based on small-sample transfer learning attention mechanism. proposed first utilizes offline data to train feature extraction reduce online training time. Meanwhile,...

To improve the clutter suppression performance of airborne radar in heterogeneous environment, a robust refined training sample reweighting space–time adaptive processing (STAP) method called RRSRW is proposed here. First, some target-free samples around cell under test (CUT) are selected and corresponding dictionary matrices constructed using system parameters. Then, patch amplitudes array error for simultaneously estimated through formulated constrained least squares problem. Subsequently,...

This paper addresses joint design of the transmitting waveform and receivers a dual-function radar-communication (DFRC) system that enables both multiple-input multiple-output (MIMO) radar sensing multi-user single-output (MU-MISO) communications. The proposed approach incorporates communication receiving (Rx) coefficients, in addition to Rx filters. We seek maximize minimum signal-to-interference-plus-noise ratio (SINR) over multiple targets, subject per-antenna power constraints,...

Deceptive jamming may not only induce a large amount of false alarms and deteriorate the target detection performance, but also lead to degraded space-time adaptive processing (STAP) performance in an airborne radar. To tackle these issues, this paper proposes cognitive transmitting scheme counter deceptive for array The proposed approach is composed two steps. first step perception. A specially designed high pulse repetition frequency (PRF) waveform transmitted, then identified according...

In space-borne surveillance radar, the medium pulse repetition frequency (MPRF) is preferred to avoid transmit eclipsing in range domain meanwhile obtain a large unambiguous Doppler detectable zones, especially for ultra-high speed targets. However, there exist great challenges acquiring information of targets due serious and velocity ambiguity. this paper, new method proposed resolve two-dimensional (2D) ambiguity suppress ghosts simultaneously. Firstly, 2D matrix consists all possible from...

Clutter suppression for short‐range ground moving target indication in forward looking airborne radar is a challenging problem because of the range‐dependent clutter. If pulse repetition frequency chosen so high that clutter range ambiguous, then additional blind velocities at induced by far‐range will occur. To eliminate these velocities, an efficient beamspace‐based adaptive prefiltering method elevation proposed this study to suppress ambiguous The beamformer can provide nearly optimal...