Algorithms for Designing Unimodular Sequences with High Doppler Tolerance for Simultaneous Fully Polarimetric Radar

Abstract

Simultaneous fully polarimetric radar uses orthogonal polarization channels to transmit a pair of signals, both of which must have good auto- and cross-correlation characteristics. In this paper, the design of sequences with good correlation properties and Doppler tolerance is investigated. New cyclic algorithms, namely, Cyclic Algorithm-Gradient I (CAGI) and Cyclic Algorithm-Gradient II (CAGII) are proposed to solve the optimization problem. Meanwhile, the sequences designed in this paper have ultra-low auto- and cross-correlation side-lobes in a specified lag interval. Numerical experiments are conducted to demonstrate and validate the superiority of the proposed cyclic algorithms, especially for the measurement of moving targets.

A Method for Estimating the Polarimetric Scattering Matrix of Moving Target for Simultaneous Fully Polarimetric Radar

“…The simplified signal processing flow chart of the STSR radar is depicted in Figure 1 [ 8 ]. Suppose the STSR radar transmits a pair of opposite (up-going and down-going) slope of linear frequency-modulation (LFM) waveforms, which can be expressed as where and is the pulse duration.…”

“…Thus, the PSM of the targets can be retrieved within one pulse recurrent time (PRT). In this case, the limitation caused due to the change of the transmitted polarization states in ATSR scheme can be overcome [ 8 ].…”

Joint Design of Complementary Sequence and Receiving Filter with High Doppler Tolerance for Simultaneously Polarimetric Radar

“…In addition to the orthogonality, low sidelobes of pulse compression in co-polarization channels are often required for weak target detection [10], i.e., good pulse compression characteristics of the waveforms are also desired for simultaneously polarimetric radar (SPR), as well as good orthogonality. Meanwhile, in the consideration of moving targets, the radar waveform should have good Doppler tolerance, i.e., it should be Doppler resilient [7,11].…”

“…These waveform properties can usually be evaluated by utilizing the ambiguity function (AF) [12,13]. Therefore, the AFs of ideal SPR waveforms must be of a two-dimensional "thumbtack" shape in co-polarization and an all-zero "plane" in cross-polarization channels, respectively [10,14].…”

A Novel Radar HRRP Recognition Method with Accelerated T-Distributed Stochastic Neighbor Embedding and Density-Based Clustering

“…As a device for transmitting and receiving electromagnetic waves, radar has played an indispensable role in in both civilian and military fields [1]. Radar automatic target recognition refers to the work of automatically identifying targets of interest with the acquired radar information [2,3].…”