Research on Pattern Synthesis of Time Modulated Sparse Array Based on Discrete Variable Convex Optimization

Abstract

Effective resource utilization is an important problem in the application of array, especially for the new time modulated array. Considering the problem of full utilization of array elements in time modulated array, a sparse optimization algorithm based on discrete variable convex optimization is proposed in this paper. The pattern optimization of equal excitation time modulation array is realized in two stages: In the first stage, the number of working array elements is as low as possible under the condition of suppressing the sidelobe of the central frequency. In the second stage, the sideband is suppressed by iterative convex optimization. The numerical simulation results are compared with other methods to verify the effectiveness of the proposed method in pattern optimization of equal excitation time modulation array. Finally, the optimization performance of the algorithm with different array parameters is verified.

Time modulation based unconventional phased antenna arrays for monopulse and multifunction radar systems

“…The SLL 1 of the scanned beams are also minimized by the proposed approach to lower the interference or radiation in unwanted direction. For 20 and 30‐element scanned arrays, SLL 1 is also lowered up to −23.53 and −25.59 dB in compared to −21.6 36 and −23.6 dB 30 of the best‐reported results. It is evident from the comparison table that irrespective of the array size, the proposed methods outperform other reported literature results in terms of SLL 0 and SLL 1 .…”

“…The undesired harmonics have further been utilized for synthesizing flat‐top and cosec squared patterns 29 . TMLAs have also found suitable for sparse arrays using convex optimization method 30 . Multibeam forming through shared aperture subarrays, 31 and direction of arrival estimation using optimized time steps 32 have opened up the possibilities of using TMLAs for radar 33 and satellite communications 34 .…”

“…29 TMLAs have also found suitable for sparse arrays using convex optimization method. 30 Multibeam forming through shared aperture subarrays, 31 and direction of arrival estimation using optimized time steps 32 have opened up the possibilities of using TMLAs for radar 33 and satellite communications. 34 The beneficial usage of harmonics have also created ample opportunities to use TMLAs for advanced communication application like femtocell cognitive radio systems.…”

Optimized multibeam synthesis of time-modulated microstrip arrays

“…In this paper, we would like to design multibeam arrays based on the time-modulated array [25], [26]. The multibeam is constructed by exploiting the resulting signals at the fundamental, first harmonic, and second harmonic frequencies.…”