Fast Estimation of Frequency and 2-D Doas for Cylindrical Conformal Array Antenna Using State-Space and Propagator Method

Abstract

Abstract-The pattern of each element in conformal array has a different direction for the curvature of conformal carrier, which results in polarization diversity of conformal array antenna. Polarization parameters of incident signals are considered in snapshot data model in order to describe the polarization diversity of conformal array antenna. It is required that the polarization parameters and direction of arrival (DOA) of incident signals are estimated together. An integrated frequency and DOA estimation method is proposed in this paper for cylindrical conformal array antenna. The frequency estimation of signal source is obtained by constructing state-space matrix. Through well-designed configuration of elements on cylindrical carriers along with estimation of signal parameters via propagator method (PM), the decoupling scheme for DOA and polarization parameters is implemented. A novel parameter pairing method for frequency and DOA of multiple sources utilizing the interpolation technique is given, based on which the fast frequency-DOA estimation algorithm is developed. Effectiveness of the proposed method is demonstrated by simulation experimental results.

A Low Energy Consumption DOA Estimation Approach for Conformal Array in Ultra-Wideband

“…As a result, the most commonly used DOA estimation algorithms are not suitable for conformal array antenna. Recently, DOA estimation algorithms for conformal array antennas, which have high resolution, are proposed [18][19][20][21][22]. The MUSIC algorithm and sub-array divided technique are employed, but the computational complexity of the spectrum peak searching is still too high [18,19].…”

“…Based on the mathematical technique of geometric algebra, the 2D DOA and polarization parameter estimations are accomplished by iterative ESPRIT algorithm [21]. The joint frequency and 2D DOA estimations for cylindrical conformal array antenna are acquired using state-space and propagator method, and the interpolation technique is adopted for parameter pairing [22]. However, the mathematical model of steering vector is too complicated [20][21][22], and the elements with separation must be half of the wavelength [23].…”

Direction Finding for Bistatic Mimo Radar Using Em Maximum Likelihood Algorithm

“…According to (12), ln f Z (ϑ) can be decomposed into a series of ln f z k (ϑ k ) for the independence of e k [n], k = 1, . .…”

“…Target direction estimation is a basic function of a radar system [12][13][14][15][16][17][18][19]. Many advanced DF algorithms for MIMO radar have been extensively discussed in the current literature [4][5][6][7][8][9][10][11].…”

Finite Ground CPW-Fed Uwb Antenna Over the Metallic Cylindrical Surfaces

“…Therefore, this type of antenna is suitable for use in flexible electronic systems [26,27]. Conformal antennas are becoming popular due to their many advantages and possibilities of applications they offer [28][29][30]. The advantages of using antennas with a curved surface arise not only from the possibility of integrating them with the object on which they are mounted on but also from the increase, relatively to planar antennas, of their visible angular range.…”