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We derive a phase retrieval algorithm using the alternating direction method of multipliers. For the cost function obtained from the maximum likelihood criterion, we introduce auxiliary amplitude and phase variables to avoid the absolute value operator and decouple the determination of the auxiliary phase variables from that of the auxiliary amplitude variables. As a result, a phase retrieval algorithm...
In order to provide accuracy referential attitude of remote sensing satellite for images processing, all measurements obtained by the attitude determination system are processed offline periodically to fusion temporal information effectively. RTS (Rauch-Tung-Striebel) optimal fixed-interval smoothing algorithm based on UKF (Unscented Kalman Filter) forward filter was employed for data post-processing...
In this paper, Rauch-Tung-Striebel(RTS) optimal smoothing algorithm is applied to improving off-line satellite attitude determination accuracy. The measurements are first processed by the forward filter, and then, a separate backward smoothing pass is used for obtaining the smoothing solution. The performances between RTS and extended Kalman filter(EKF) in gyro/star-sensor integrated system are compared...
In this paper, we consider the problem of direction-of-arrival (DOA) estimation in the presence of multi-path propagation. The sensor elements are assumed to be linear and uniformly spaced. To solve this problem, we propose a two step approach to perform DOA estimation in the presence of coherent signals for a uniformly spaced linear array of sensors. First, the effective steering vectors are estimated...
To investigate the blind symbol rate estimation of any linear base-band digital modulation scheme with square root raised cosine filter, an algorithm based on cyclic correlation and Haar wavelet transform estimator is proposed. First we use FFT to estimate the bandwidth roughly. Then we set the sampling frequency and range scale of wavelet transform according to bandwidth. Using the signals filtered...
In the study of location partial discharge in transformer based on the UHF method, in order to accurately locate partial discharge source, precisely achieving time delay of different signals which are received by different UHF sensors and radiated from the same partial discharge source is essential. Three methods of time delay estimation are introduced and compared, including the initial peak, the...
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