Warping conversion correction method under non-ideal waveguide
A non-ideal, correction factor technology, applied in the field of signal processing, can solve the problem of difficult acquisition, and achieve the effect of accurate signal spectrum value, high calculation accuracy, and high practical application value
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specific Embodiment 1
[0023] 1. Filter and analyze the received signal. Received signals in practical applications generally have relatively large bandwidths. In order to obtain signals with appropriate bandwidths, the signals need to be filtered. Half of the filter used is a bandpass filter. If the filtered signal has a long time window, the signal can also be processed with pulse compression, which will not affect the performance of the signal.
[0024] 2. In order to analyze the effective signal, it is also necessary to intercept the signal, and the starting point of interception is the earliest arrival time of the first-order normal wave. The starting point of interception is the earliest arrival time of the first order normal wave. In the case of unclear environmental parameters, the arrival time of the first-order normal wave is unknown, and the time starting point at this time can be t 0 =r / c 0 Instead, where the transceiver distance r and the average speed of sound in seawater c 0 Esti...
specific Embodiment 2
[0029] The purpose of the present invention is to invent a warping transformation correction method suitable for non-ideal waveguides without obtaining a large number of detailed seabed environment parameters. Aiming at the difficulty of obtaining seabed parameters, the warping transformation correction formula of a non-ideal waveguide with a uniform semi-infinite seabed based on the seabed phase shift parameter P is obtained by using the relationship between the seabed phase shift parameter P and the seabed environmental parameters. The correction factor is only related to marine environmental parameters such as seabed phase shift parameters, sea depth, and average sound velocity in seawater, and does not require detailed seabed parameters, which greatly reduces the workload.
[0030] The principle that the present invention is based on is as follows:
[0031] The received time-domain signal is p(t), which can be expressed as the superposition of multi-order normal waves Bn(t...
specific Embodiment 3
[0051] 1. The warping transformation correction method under the non-ideal waveguide.
[0052] 2. Compared with the traditional warping transformation, the sound velocity in the ambient water is uniform sound velocity and absolute hard seabed, the present invention is characterized in that: the sound velocity profile of the waveguide is that the sound velocity varies with the depth of seawater, i.e. the expression of the seawater sound velocity profile for:
[0053]
[0054] However, the seabed used in the present invention is a liquid semi-infinite seabed, which is closer to the actual ocean environment.
[0055] 3. The classic warping transformation method is based on the ideal waveguide, that is, the sound velocity in seawater is uniform and does not change, and the seabed is absolutely hard. Warping transform essentially processes the phase of the received signal, and the difference in phase between the non-ideal waveguide and the ideal waveguide mainly increases the i...
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