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A Doppler Shift Correction Method Based on Down-conversion Beamforming

A technology of Doppler frequency shift and correction method, applied in radio wave measurement systems, instruments, etc., can solve problems such as influence and sounding error, and achieve the effect of eliminating random phase errors and correcting Doppler frequency shift

Active Publication Date: 2017-12-12
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, through theoretical derivation and analysis in this paper, it is shown that because the Doppler frequency shift demodulated signal has not moved to zero frequency, a random phase error is introduced, which can affect the beamforming pointing and produce sounding Error, which affects both chirp signals and simple pulse signals

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  • A Doppler Shift Correction Method Based on Down-conversion Beamforming
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  • A Doppler Shift Correction Method Based on Down-conversion Beamforming

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Embodiment Construction

[0032] A method for correcting Doppler frequency shift based on down-conversion beamforming in the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] When the transmitted signal is a simple pulse signal, the specific analysis of the impact of Doppler frequency shift on down-conversion beamforming is as follows:

[0034] For a simple pulse signal, the delay reference points of two consecutive sub-arrays are the geometric centers of the two sub-arrays, and the distance between them is d 0 , denoted as reference point 1 and reference point 2. The complex signal of the digital signal received by the delay reference point of the receiving array can be expressed as:

[0035]

[0036] Among them, t is time, after digital sampling t=n / f s , n is the serial number of the digital sampling sequence, n=1,2...,f s is the sampling frequency, f k is the center frequency of the kth frequency band signal, k=1,2...,K,...

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Abstract

The present invention provides a Doppler frequency shift correction method based on down-conversion beamforming, the Doppler frequency shift correction method introduces random phase error and phase generated by Doppler frequency shift and eliminates the beam through phase compensation The impact of pointing and sounding errors is formed; the simulation results show that the correction method for Doppler frequency shift of the present invention can eliminate random phase errors and effectively correct Doppler frequency shift.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a Doppler frequency shift correction method based on down-conversion beamforming. Background technique [0002] Beamforming technology is widely used in radar signal processing, communication signal processing and sonar signal processing. It can amplify the signal in a certain direction, suppress the echo signal in other directions, and improve the signal-to-noise ratio in determining the direction. The beamforming generally adopts the delay weighted summation method. Multi-beam sounding sonar needs to stabilize the attitude of roll (Roll), and usually adopts the method of delay weighted summation for beam forming. However, the down-conversion beamforming method needs to demodulate the array signal and perform complex delay-weighted summation on the baseband signal. Since the change rate of the baseband signal is slow, high-precision delay-weighted summation can be realiz...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/52
Inventor 刘治宇董飞刘小刚刘晓东
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI