The digital wideband arrays with data converters and digital signal processing capability permit greater flexibility in the pattern synthesis than conventional time‐delay steered wideband arrays, which provides an opportunity to solve the polarised pattern synthesis of wideband arrays by using numerical optimisation algorithms. A finite‐impulse response (FIR) filter is placed at each element to directly optimise the synthesised polarisation and wideband power patterns. Both the optimisations of the sum and difference patterns are formulated as convex programming problems to obtain efficient solutions. The proposed synthesis method, which has no special requirement on the array geometry and element pattern, is flexible and applicable to arbitrary arrays. By optimising the complex coefficients of FIR filters, any state of polarisation can be synthesised in a given angle‐frequency space with frequency‐invariant main beams and arbitrary sidelobe upper bounds. Various design examples are presented to testify the potentiality of the proposed method.
Based on the ambiguity function, a novel signal processing method for the polarization measurement radar is developed. One advantage of this method is that the two orthogonal polarized signals do not have to be perpendicular to each other, which is required by traditional methods. The error due to the correlation of the two transmitting signals in the traditional method, can be reduced by this new approach. A concept called ambiguity function matrix (AFM) is introduced based on this method. AFM is a promising tool for the signal selection and design in the polarization scattering matrix measurement. The waveforms of the polarimetric radar are categorized and analyzed based on AFM in this paper. The signal processing flow of this method is explained. And the polarization scattering matrix measurement performance is testified by simulation. Furthermore, this signal processing method can be used in the inter-pulse interval measurement technique as well as in the instantaneous measurement technique.target polarization scattering matrix, measurement of the polarization scattering matrix, ambiguity function, ambiguity function matrix, polarimetric radar, radar waveform, radar signal processing
Instantaneous polarization radar can obtain radar target polarization scattering matrix (PSM) by using single pulse echo. The system overcomes the defects of inter-pulse interval polarization measurement radar and accurately measures the PSM of the moving target. Thus the capabilities of detection, anti-jamming and target identification can be improved. The present paper reports the first international self-developed instantaneous polarization radar experimental system and, by using this system, the measurement experiments of target polarization characteristics are conducted. The results show that the performance of target instantaneous polarization measurement by different waveforms is good. The basic and common problems in polarization scattering feature extraction and recognition domain are solved. instantaneous polarization radar, polarization scattering matrix, instantaneous polarization measurement Citation: Wang X S, Li Y Z, Dai H Y, et al. Research on instantaneous polarization radar system and external experiment.The full information of radar target can be provided by the polarization scattering matrix (PSM). How to acquire the accurate information of PSM of radar target and utilize it effectively have long been concerned in the domains of SAR imaging radar, polarization filter, polarization enhancement, polarization anti-interference, geography remote sensing, and radar target identification [1][2][3][4][5][6][7]. In the past two decades, the studies of radar polarization have been highlightened. We carried on a lot of basic research on radar target polarization scattering property [5][6][7], polarization target detection [8][9][10][11], polarization filter enhancement [11][12][13][14][15][16][17][18][19][20][21][22], anti-interference [23-25], polarization insensitivity array signal processing [26][27][28][29] and polarization identification [30][31][32][33], and have accumulated a large quantity of innovative research results, and have laid a good theoretical foundation for real polarization radar system development.
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