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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (9): 321084-321084.doi: 10.7527/S1000-6893.2017.321084

• Electronics and Electrical Engineering and Control • Previous Articles     Next Articles

Direct localization method for constant modulus source based on Doppler frequency shifts

WANG Ding1,2, YIN Jiexin1,2, WU Zhidong1, LIU Ruirui1   

  1. 1. School of Information Systems Engineering, PLA Information Engineering University, Zhengzhou 450001, China;
    2. National Digital Switching System Engineering & Technological Research Center, Zhengzhou 450002, China
  • Received:2016-12-30 Revised:2017-03-15 Online:2017-09-15 Published:2017-04-01
  • Supported by:

    National Natural Science Foundation of China (61201381);China Postdoctoral Science Foundation (2016M592989);The Outstanding Youth Foundation of Information Engineering University (2016603201)

Abstract:

Compared with the conventional Differential Doppler (DD) localization method, the Direct Position Determination (DPD) method proposed by Amar and Weiss has higher position estimation accuracy under the condition of low Signal-to-Noise Ratio (SNR) and small number of samples. Based on this novel localization mechanism, a new DPD method using Doppler frequency shifts is presented for the constant modulus source. The DPD optimization model is constructed based on the Maximum Likelihood (ML) criterion as well as the constant modulus property of the source. All the unknowns are then classified into two groups according to the algebraic characteristic of the cost function, and an effective alternating iteration algorithm is presented to solve this DPD optimization problem numerically. In the proposed algorithm, two Newton-type iterative steps are devised for the two groups of unknowns, and then the grid search can be avoided and the multidimensional parameters are decoupled. The Cramér-Rao Bound (CRB) on the direct position estimation variance for constant modulus source is derived. Simulation results corroborate the good performance of the proposed method.

Key words: passive location, direct position determination, Doppler frequency, constant modulus source, maximum likelihood estimation, Newton-type iteration, Cramér-Rao bound

CLC Number: