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Wake-up signal detection method for underwater acoustic communication MODEM

A wake-up signal and detection method technology, applied in baseband system components, electrical components, transmission systems, etc., can solve the problems of high requirements for wake-up signal detection operation efficiency, high missed detection rate, and easy interception of wake-up signals.

Inactive Publication Date: 2014-12-24
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

[0003] The present invention provides a wake-up signal detection method for underwater acoustic communication MODEM in view of the shortcomings of the wake-up signal currently used by the above-mentioned underwater acoustic modem, which are easy to be intercepted, high missed detection rate, and high efficiency requirements for wake-up signal detection operations.

Method used

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  • Wake-up signal detection method for underwater acoustic communication MODEM
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  • Wake-up signal detection method for underwater acoustic communication MODEM

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Embodiment Construction

[0036] Below in conjunction with specific implementation example and accompanying drawing, the present invention will be further described:

[0037] 1. Wake-up signal design

[0038] figure 1 Design a block diagram for the wake-up signal, select a sequence with a difference of 1 between "0" and "1" from the Gold sequence family to be a balanced Gold sequence, repeat the selected balanced Gold sequence once, perform dual polarization processing, add a rectangular window, and The carrier frequency is mixed, and the real part of the signal is taken to generate a wake-up signal as shown in formula 1. g(n) in Formula 1 is the chip of the balanced Gold sequence, T c is the chip period, L is the sequence length, w c is the carrier frequency.

[0039]

[0040]

[0041] The time-frequency diagram of the wake-up signal s(t) does not have obvious line spectrum like the CW pulse, and its features are not obvious, such as figure 2 , the balanced code Gold sequence has better sp...

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Abstract

The invention provides a wake-up signal detection method for an underwater acoustic communication MODEM. The method includes the steps that two repeated two-phase code signals generated by a balanced Gold sequence are selected as wake-up signals, sliding correlation treatment between adjacent data block pairs different in length is adopted in a receiving end, a data block start moment corresponding to the maximum correlation value is wake-up signal arrival time, the difference between the length of a data block corresponding to the maximum correlation value and the length of each sent wake-up signal is the Doppler time stretching length, and therefore the wake-up signal arrival time and the Doppler time stretching length are jointly estimated; a current correlation value is obtained in the mode that a product of start data of the currently adjacent data block pairs at last time is subtracted from the sum of a former correlation value and a product of tail data of the currently adjacent data block pairs, the calculation amount is far smaller than that of multiple sliding copy correlation devices, and the method can be conducted in real time under the conditions of dormancy of the underwater acoustic communication MODEM and the low clock frequency of a processor and is high in practicality.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to a detection method for an underwater acoustic MODEM wake-up signal. Background technique [0002] Most underwater acoustic MODEMs are powered by batteries, and low power consumption design needs to be considered. The on-duty sleep mechanism is one of the effective means to save power consumption. When idle, the underwater acoustic MODEM is in a low-power sleep state, and only a small part of the circuit is powered on. In the working state, once the wake-up signal is detected, the power supply of the subsequent corresponding circuit modules will be turned on for communication transmission or reception. At present, the common underwater acoustic modem wake-up signal is a combination of multiple CW pulses of different frequencies. FFT processing is used to obtain the frequency point energy of the CW pulse and compare it with the threshold for ju...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04B13/02
Inventor 熊省军张宏滔朱小辉高少波王颖
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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