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Doppler estimation method based on measurement of carrier frequency of direct sequence spread spectrum signal

A technology of direct sequence spread spectrum and Doppler estimation, applied in baseband system components, electrical components, transmission systems, etc., can solve the problems of low estimation accuracy and large estimation deviation

Inactive Publication Date: 2015-09-09
HARBIN ENG UNIV
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Problems solved by technology

But at the same time, it faces the problem of low estimation accuracy of CW pulse frequency measurement under low signal-to-noise ratio, and it is easily affected by the stop-band characteristics of the underwater acoustic channel transfer function, resulting in large estimation deviations.

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  • Doppler estimation method based on measurement of carrier frequency of direct sequence spread spectrum signal
  • Doppler estimation method based on measurement of carrier frequency of direct sequence spread spectrum signal
  • Doppler estimation method based on measurement of carrier frequency of direct sequence spread spectrum signal

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] The purpose of the present invention is to provide a Doppler estimation method based on direct sequence spread spectrum signal carrier frequency measurement, which can be used to estimate the Doppler coefficient in mobile underwater acoustic communication.

[0037] The present invention is realized as follows:

[0038] (1) Spread spectrum modulation of single-frequency CW pulses with pseudo-random sequence;

[0039] (2) Amplify the power of the spread spectrum modulated signal and transmit it into the water through the transmitting transducer;

[0040] (3) The receiving end uses a hydrophone to receive the signal, after filtering and amplifying, using a matched filter to estimate the time of arrival of the signal;

[0041] (4) Use the time reference provided in the previous step and the locally generated pseudo-random sequence to despread the received signal, the...

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Abstract

The invention discloses a Doppler estimation method based on measurement of a carrier frequency of a direct sequence spread spectrum signal. The method comprises the following steps of adopting a pseudorandom sequence to carry out spread spectrum modulation on single-frequency CW (Continuous Wave) pulses; forming an emission signal after power amplification is carried out on a spread spectrum modulation signal; sending the emission signal into water through a transmitting transducer; enabling a receiving end to receive the signal by utilizing a hydrophone, carry out time synchronization on the receiving signal by utilizing a copy correlator after the signal is filtered and amplified, and carry out de-spread processing on the receiving signal by utilizing a local pseudorandom sequence after time synchronization is detected; measuring a frequency value by utilizing a high-resolution computing method after low-pass filtering is carried out on the de-spread signal; and estimating a Doppler coefficient according to the frequency value and an original carrier frequency value. The method has the advantage of high estimation precision.

Description

Technical field [0001] The invention belongs to the field of underwater acoustic communication, and particularly relates to a Doppler estimation method based on direct sequence spread spectrum signal carrier frequency measurement capable of estimating the Doppler coefficient in mobile underwater acoustic communication. Background technique [0002] The Doppler effect is an important cause of signal distortion in mobile communications, especially in underwater acoustic channels. The Doppler effect in underwater acoustic communication will bring about the appearance of high bit error rate, or even completely unable to realize the communication task. The present invention is proposed based on the research foundation of Doppler effect estimation in mobile underwater acoustic communication. Scholars have done a lot of research on Doppler estimation methods in underwater acoustic communication, which can be summarized into two categories: one is to measure the frequency of the receive...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L25/02
Inventor 殷敬伟张晓杜鹏宇韩笑
Owner HARBIN ENG UNIV
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