Delay inequality estimation method with unknown frequency
A time delay difference and frequency technology, which is applied in the field of time delay difference estimation with unknown frequency, can solve the problem that the time delay difference estimation of the target radiation signal of the underwater acoustic positioning system cannot be well realized.
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[0047] The present invention will be further described below in conjunction with the accompanying drawings.
[0048] Fig. 1(a) is a positioning system virtual device based on the algorithm of the present invention provided by the present invention, and the part included in the dotted line is the position of the present invention in the existing underwater target positioning system.
[0049] The present invention provides a method for estimating time delay difference of unknown frequency, comprising:
[0050] Step 1), taking array elements 1 and 2 as an example, the time domain signal x received by array elements 1 and 2 1 (t) and x 2 (t) Perform Fourier transform to get x 1 (t) and x 2 (t) The corresponding frequency domain signal X 1 (f) and X 2 (f); then, for X 1 (f) and Multiply to get the frequency domain cross-spectrum data RX of array elements 1 and 2 12 (f), the specific calculation formula is:
[0051] X ...
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