Calculation method of forward acoustic scattering Doppler frequency shift of moving target in water with irregular trajectory
A technology of Doppler frequency shift and calculation method, which is applied in the field of forward acoustic scattering Doppler frequency shift calculation of moving targets in water, and can solve the problems of unsuitable trajectory of irregular target and calculation method of unscattered Doppler frequency shift, etc. , to achieve the effect of rigorous process and accurate results
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Embodiment 1
[0046] Embodiment 1 The method for calculating forward acoustic scattering Doppler frequency shift of a moving target in water with irregular trajectory provided by the present invention, the main process is as follows figure 1 shown, including the following steps:
[0047] (1) Target track coordinate transformation
[0048] Select an appropriate reference position in the two-dimensional plane as the origin to establish a rectangular coordinate system, convert the earth's latitude and longitude coordinates of the transmitter, receiver and target trajectory into rectangular coordinates, and mark them as (x S ,y S ), (x T ,y T ) and (x R ,y R ), where the baseline length (transceiver connection length) can be expressed as:
[0049]
[0050] (2) Estimating the target movement speed
[0051] Denote the target trajectory coordinate sequence as (x T (t i ),y T (t i )), i=1,2,...,N, then the target is at any two adjacent moments t i and t i+1 The movement speed betwee...
Embodiment 2
[0082] Embodiment 2 The algorithm of the present invention is verified by using the target track data and the extraction results of the target forward acoustic scattering Doppler frequency shift of the Qiandao Lake scaled target forward acoustic scattering detection test in 2011.
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