A High Dynamic Long Signal Accumulation Method Based on Block Doppler Compensation
A technology of Doppler compensation and Doppler information, which is applied in the accumulation field of long signals, can solve problems such as poor signal correlation, low signal-to-noise ratio gain, and low estimation accuracy, so as to improve detection and tracking performance and solve signal correlation poor sex effect
Active Publication Date: 2022-01-18
HARBIN ENG UNIV
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[0005] The purpose of the present invention is to solve the problems of low accuracy of Doppler frequency offset estimation under the background of low signal-to-noise ratio in the underwater acoustic communication system and poor signal correlation and low gain of signal-to-noise ratio in the process of long signal accumulation under high dynamic background. A High Dynamic Long Signal Accumulation Method Based on Block Doppler Compensation
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[0040] This embodiment is a highly dynamic long signal accumulation method based on block Doppler compensation. A long signal means that the time threshold of a single signal is on the order of tens of seconds, and high dynamic means that the acceleration in the object motion model is several meters per second. 2 Case. to combine figure 1 This embodiment will be specifically described.
[0041] A high dynamic long signal accumulation method based on block Doppler compensation described in this embodiment comprises the following steps:
[0042] Step S1. First, the received signal is preprocessed by carrier quadrature demodulation and filtering extraction to obtain a complex exponential spread spectrum signal S containing Doppler frequency offset information. r , S r =[s 0 ,s 1 ,s 2 ,...s N-1 ];
[0043] in: N is the number of codewords included, a is the amplitude, d is the information bit symbol, f d is the Doppler information contained in the codeword, f s is the ...
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The invention relates to a high dynamic long signal accumulation method based on block Doppler compensation, which belongs to the technical field of marine measurement. In order to solve the problems of low accuracy of Doppler frequency offset estimation in the background of low signal-to-noise ratio and poor signal correlation and low gain of signal-to-noise ratio in the process of long signal accumulation in the high dynamic background in the underwater acoustic communication system. The invention divides the received signal into blocks; uses the pulse-to-phase frequency measurement algorithm to estimate the frequency offset of each signal block; combines the frequency offset estimation results to determine the starting position of the effective received signal; uses the frequency offset estimation value of the current signal block in sequence Doppler compensation is performed on subsequent signal blocks; for the compensated received signal, each codeword is accumulated with the subsequent codeword to realize signal accumulation. It is mainly used for Doppler frequency offset estimation in underwater acoustic communication systems.
Description
technical field [0001] The invention relates to a method for accumulating long signals and belongs to the technical field of oceanographic measurement. Background technique [0002] The underwater acoustic channel has serious time-varying and space-varying characteristics, and is restricted by the marine environment and the working conditions of the underwater mobile platform. The propagation of sound waves in water will be affected by factors such as high noise, complex multi-channel expansion, and Doppler frequency shift. It brings great challenges to the underwater acoustic signal detection and tracking technology with low signal-to-noise ratio under high dynamic conditions. [0003] For the signal accumulation under the condition of low SNR, the coherent, non-coherent and differential coherent integration methods used in the traditional technology can effectively improve the SNR gain and improve the detection performance. Uncertainty leads to different degrees of freque...
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IPC IPC(8): H04L27/00H04L25/02H04B13/02
CPCH04L27/0014H04L25/0224H04B13/02
Inventor 崔宏宇郑翠娥张居成韩云峰孙大军张殿伦
Owner HARBIN ENG UNIV