Signal processing method of automatic ultrasonic depth finder, based on frequency hopping signal

Abstract

The invention discloses a signal processing method of an automatic ultrasonic depth finder, based on a frequency hopping signal. The signal processing method of an automatic ultrasonic depth finder, based on a frequency hopping signal includes the following steps: 1) a depth finder transmitter transmits a frequency hopping signal, and the frequency hopping signal is converted into a sound wave through an energy transducer and is transmitted in water, and then the sound wave reaches the seabed and is reflected, and then is converted into an electric signal through the energy transducer, and the electric signal is received by a receiver under test; 2) the receiver performs filtering and preprocessing on the signal; 3) automatic gain control, frequency moving and pulse compression are successively performed on the received signal, and a seabed echo signal is extracted; and 4) the extracted seabed echo signal is used to perform a bottom detection and bottom tracking algorithm to measure the depth and hypsography of the seabed. For the signal processing method of an automatic ultrasonic depth finder, based on a frequency hopping signal, as the transmission signal is a frequency hopping signal, and the depth measuring performance and the anti-interference capability of a depth finder can be improved by means of the high processing gain and correlation of the frequency hopping signal, long distance measurement with high accuracy can be realized and the problem that a current depth finder cannot consider the distance resolution and the operating distance at the same time can be solved. Besides, by means of automatic gain control, automatic tracking, automatic searching and other automatic depth finding algorithms, the signal processing method of an automatic ultrasonic depth finder, based on a frequency hopping signal can realize automatic measurement during the whole process and has no demand for manual adjustment.

Description

technical field [0001] The invention belongs to the technical field of ocean detection and relates to a signal processing method of an ultrasonic sounder, in particular to a signal processing method of a fully automatic ultrasonic sounder based on a frequency hopping signal. Background technique [0002] In recent years, the rapid development of the marine industry has increasingly become the focus of technological, economic and military competition among countries around the world. Shallow water areas such as my country's offshore continental shelf, rivers and lakes are the main maritime economic activity areas. Ocean development and marine engineering such as port construction and offshore oil production are concentrated in the offshore, and most of them are shallow seas. Water conservancy projects, ports and other facilities are also increasing. Submarine topographic survey is a necessary operation for marine transportation, channel dredging, submarine cable laying and su...

AI Technical Summary

Problems solved by technology

At present, although the ultrasonic depth sounder has made great progress, some problems are still exposed in some applications: (1) The degree of automation is still insufficient, and manual adjustment is still required; (2) The distance resolution and function of the instrument The distance cannot be achieved at the same time; (3) In the complex environment and interference, the measurement effect is poor and other problems

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