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A Time Delay Estimation Method for Underwater Acoustic Location Based on Pattern Delay Coding

A time-delay estimation and underwater acoustic technology, applied in the field of sonar, can solve problems such as unguaranteed measurement accuracy and error detection, and achieve the effects of avoiding wrong time-delay estimation, accurate time-delay estimation, and improving detection performance

Inactive Publication Date: 2014-10-08
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the time delay estimation method in the prior art cannot guarantee the measurement accuracy and is prone to false detection, so as to provide a time delay estimation method with low overhead and high accuracy

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  • A Time Delay Estimation Method for Underwater Acoustic Location Based on Pattern Delay Coding
  • A Time Delay Estimation Method for Underwater Acoustic Location Based on Pattern Delay Coding
  • A Time Delay Estimation Method for Underwater Acoustic Location Based on Pattern Delay Coding

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Embodiment Construction

[0029] The present invention will be further described now in conjunction with accompanying drawing.

[0030] For ease of understanding, before describing the time delay estimation method of the present invention, the pulse structure of the Pattern time delay coding involved in the method is firstly described.

[0031] Fig. 1 is a schematic diagram of the pulse structure of the Pattern time-delay coding. Figure 1.a A set of symbol structure is given in , which contains L pattern codes with good correlation, where τ di (i=1, 2, 3,...) represents the delay difference, indicating that the Pattern code appears in the position of the symbol window; T p Indicates the pattern code pulse width; T 0 Indicates the symbol width; T c Indicates the encoding time, T c = T 0 -T p . The duty cycle of each symbol in the PTDS system is η=T p / T 0 , whose value is less than 1. The depth information of the transponder in the ultra-short baseline is obtained by the pressure sensor, and b...

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Abstract

The invention relates to a time delay estimation method based on the Pattern delay coding underwater acoustic positioning. The method includes: determining corresponding relations of a signal form sending a Pattern signal, pulse time delay inequality and a location information code; establishing a duplicate signal corresponding to relevant operation; respectively intercepting a Pattern pulse in a received signal, and first time relevant operation is performed for a intercepted signal and the duplicate signal; a first time relevant operation result and a detection threshold value are compared, if in the first time relevant operation result, only one relevant peak value exceeds the detection threshold value, location information of a transponder is calculated according to the corresponding relations of time delay inequality of PLFM pulse relevant peaks and NLFM pulse relevant peaks, the pulse time delay inequality and the location information code, and otherwise, mutual relevant operation is performed for a first time relevant result of PLFM pulses and a first time relevant result of NLFM pulses, a largest peak value is found in the mutual relevant operation, and the location information of the transponder is calculated according to the largest peak value.

Description

technical field [0001] The invention relates to the field of sonar, in particular to a time delay estimation method for underwater sound positioning based on Pattern time delay coding. Background technique [0002] In the field of sonar and radar, it is often necessary to accurately obtain the position of the transmitted pulse signal, and the time delay estimation method is a method for obtaining the position of the transmitted pulse signal. The usual time delay estimation method adopts correlation detection technology, that is, pulse compression is performed on the received signal by using a matched filter in time, and then the peak position is judged by correlation peak detection, which is the position of the transmitted pulse signal. In ultra-short baseline positioning, the Pattern delay difference code between pulse signals is often used to transmit the position information of the transponder. For example, different delay differences represent the depth value of the tran...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/06
Inventor 吴永清许枫
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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