Design of a Sparse Antenna Array for Communication and Direction Finding Applications Based on the Chinese Remainder Theorem

Abstract

Abstract-In this paper we propose a sparse antenna array with nine elements for the integrated system of communication and direction finding. The main idea is that the sparse antenna array, whose element spacing is relatively larger than half wavelength, are divided into six two-element subarrays to transmit multi-beam. According to the spatial correlation characteristics of multi-beam, a packet exciting method employing multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) signal is designed to modulate the directional information into the signal space of subcarriers. In this way, a receiver with a single antenna can accomplish communication and direction-finding function by demodulation received signal. For the direction finding algorithm of the sparse antenna array, an approximate algorithm is designed to resolve the ambiguity problem based on the Chinese remainder theorem. Simulation results show that the proposed sparse antenna array can be applied to the integrated application of communication and direction finding.

Compact Microstrip Rotman Lens Using Chebyshev Impedance Transformers

“…With the development of wireless communication systems, the antennas with beam scanning function have been highly desired [1,2]. The Rotman lens is a passive beam former used in multi-beam antenna systems [3].…”

System Error Analysis and Calibration Methods for Multi-Channel Sar

“…To overcome the minimum antenna area constraint, multi-channel SAR system [7][8][9][10][11][12] has been developed which employ multiple receive-apertures to obtain additional information along the flying track In this system, small transmitaperture is implemented to illuminate wide area with high resolution, and the receiving antenna is split into multiple sub-apertures with independent receiver channels. Since each individual antenna does not meet the minimum antenna area constraint, range and/or Doppler ambiguities will be inevitably induced into the echoes.…”

Rf Directional Modulation Technique Using a Switched Antenna Array for Communication and Direction-Finding Applications

“…Paper [6] designs an inverse monopulse system for communication and directionfinding applications based on sum and difference beams NFDAM technique. Paper [7] proposes a multiple beams OFDM-NFDAM signal transmitted by a sparse antenna array for communication and direction-finding applications. These papers prove that the receiver can demodulate the data information and azimuth angle information from this scrambled constellation simultaneously, if a proper RF modulation technique is designed for the transmitter.…”

“…iii) The Doppler frequency shift information of the switched antenna array is modulated into the transmit signal constellation different from papers [6,7], which modulate the spatial parameter of the radiation pattern into the transmit signal constellation. In this way, an azimuth angle estimation algorithm is developed to extract the azimuth angle information from the scrambled constellation based on frequency measurement algorithm, unlike papers [6,7,26,27,35,36], which are similar to monopulse system based on the amplitudecomparison algorithm using the multiple transmit beams [6,7], sumdifference patterns [26,27] and fundamental frequency component and first harmonic components [35,36], respectively.…”

“…In this way, an azimuth angle estimation algorithm is developed to extract the azimuth angle information from the scrambled constellation based on frequency measurement algorithm, unlike papers [6,7,26,27,35,36], which are similar to monopulse system based on the amplitudecomparison algorithm using the multiple transmit beams [6,7], sumdifference patterns [26,27] and fundamental frequency component and first harmonic components [35,36], respectively. The direction finding method proposed in this paper is similar to that in paper [25], which extracts the directional information from the Doppler frequency shift.…”