Direct emitter geolocation under local scattering

Direct Position Determination of Coherently Distributed Noncircular Sources

“…In summary, compared with the CML-DPD algorithm proposed in [30], the proposed algorithm in this study reduces the dimension of the estimated parameters of multiple CD sources by the SDF method, which can significantly decrease computational load. Moreover, by applying the characteristics of noncircular signals, the signal subspace is …”

“…Thus, the proposed algorithm is analyzed using the Gaussian angle of arrival (GAA) channel model as an example, similar to that in [30], to discuss the localization performance conveniently. The process employed in this study can be used as reference for the analysis of the performance of other distributed functions.…”

“…The position information of the transmitters is included in R . In [30], the CML-DPD method is proposed; however, the signal waveform should be known in advance and the computation cost is high when dealing with multitarget localization. Thus, we propose a novel SDF-DPD algorithm based on the characteristics of noncircular signals to achieve improved positioning accuracy of CD sources.…”

“…To present the algorithm better, the NCSDF-DPD algorithm based on the principle derived in this section can be implemented as in Algorithm 1. Table 2 lists the main formulas and the amount of calculation in the NCSDF-DPD and CML-DPD algorithms [30] to illustrate the difference of the computation cost between the two algorithms. The exhaustive search method is used in the two algorithms for reasonable comparison and analysis because of the large gap in the computational load of different search methods.…”

“…Thus, the DPD algorithm based on the constant modulus, cyclostationary, and orthogonal frequency division multiplexing properties of the received signals achieve good localization performance [27][28][29]. Bar proposed the CML-DPD algorithm for CD sources based on the generalized covariance matching method to improve the localization accuracy of CD sources [30]. Although the algorithm outperforms conventional two-step methods in terms of the localization accuracy of CD sources, it is not practically useful because of its huge computational complexity.…”