Doppler sensitive signal moving target underwater acoustic detection method based on space-time-frequency joint interference suppression
A technology for interference suppression and sensitive signals, which can be used in measurement devices, re-radiation of sound waves, radio wave measurement systems, etc., and can solve the problems of low detection probability and high false alarm probability.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
specific Embodiment approach 1
[0065] Specific implementation mode one: combine figure 1 , Figure 2a to Figure 2c To describe this embodiment, figure 1 Overall block diagram of signal processing for underwater moving target detection; for clarity figure 1 ,right figure 1 method, as shown in Figure 2 figure 1 A partial enlarged view of , where Figure 2a for figure 1 Partial enlarged view of step 1, Figure 2b for figure 1 Partial enlarged view of step 2, Figure 2c for figure 1 Partial enlarged view of Step 3.
[0066] This implementation mode is an underwater acoustic detection method for moving targets with Doppler sensitive signals based on combined time-space-frequency interference suppression, including the following steps:
[0067] Step 1. Data preprocessing:
[0068] When the active sonar system is used for detection, the receiving hydrophone array has N array element channels, the pulse period is T, and the sampling rate is fs. The number of pulse echoes to be processed in total is P, a...
Embodiment
[0109] Simulation conditions: The transmission signal of the transceiver system is in the form of a 10th-order m-sequence phase-modulated signal, with a pulse width of 1s, a bandwidth of 2kHz, a center frequency of 2kHz, a sampling rate fs that is 10 times the signal center frequency, and a speed of sound c = 1500m / s. It is a 12-element equidistant line array, and the element spacing is half a wavelength. At the initial moment, the target to be measured is 20m away from the receiving array, and moves away from the system in a uniform linear motion at a speed of 5 knots (2.5m / s), and the angle between the moving direction and the array is 60°. There is a strong interference target 480m away from the system, and the angle between the direction and the array is 90°. Each element receives 100 pulse echoes continuously, and the pulse period T=4s. Let the signal-to-noise ratio of the target echo be 0dB, and the signal-to-noise ratio of the interference echo be 30dB, that is, the int...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More