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In order to estimate the instantaneous frequency rate (IFR) of a polynomial phase signal (PPS) with arbitrary order, a new kind of transform referred to as L-phase distribution (LPD) is defined. The principle and realization procedure of this transform are given in detail. Furthermore, we propose an iterative IFR estimation algorithm, in which successive(More)
The received Doppler signal of a stationary sensor, as emitted by a transiting acoustic source, is used to estimate source motion parameters, including speed, closest distance, rest frequency, and closest point of approach (CPA) time. First, the instantaneous frequency, amplitude, and CPA time are accurately estimated by the polynomial chirplet transform of(More)
This paper presents the foundations of a unidirectional acoustic probe based on the particle velocity gradient. Highly directional characteristics play a key role in reducing the influence of undesired acoustic sources. These characteristics can be achieved by using multiple acoustic sensors in a spatial gradient arrangement. Two particle velocity sensors(More)
According to the Doppler Effect between moving acoustic source and receiver, an approach is proposed for identification of tone noise sources on underwater moving object with single hydrophone. Firstly, the product high-order ambiguity function (PHAF) is used to estimate the instantaneous phase and amplitude of the received Doppler signal. Then the abeam(More)
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