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A time difference estimation method and device based on information demodulation correlation

A time difference estimation and estimated value technology, applied in the field of time difference positioning, can solve the problems of inability to do frequency offset compensation, the influence of time delay estimation, and high computational complexity, and achieve the effects of simple algorithm, reduced computational complexity, and overcoming chromatic dispersion.

Active Publication Date: 2021-12-10
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain problems: 1. Use the frequency domain correlation function to calculate the frequency offset between the signals, do a one-dimensional search on the frequency domain correlation function, and use the corresponding value when the sum of the correlation function reaches the maximum value as the frequency offset estimation value, High computational complexity; Second, if the frequency offset is less than the frequency resolution f of the discrete Fourier transform (DFT) s / N(f s Sampling frequency, N is the length of the DFT transformation), the existing method cannot do frequency offset compensation, simulation experiments show that when the frequency offset is smaller than the frequency resolution, the frequency offset will still have a great impact on the delay estimation and affect the positioning accuracy

Method used

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  • A time difference estimation method and device based on information demodulation correlation
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  • A time difference estimation method and device based on information demodulation correlation

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Embodiment 1

[0038] Since the signal sent by the radiation source carries information, this embodiment proposes a time difference estimation method based on information demodulation correlation, which uses information demodulation to eliminate the influence of receiver hardware deviation. This method has low computational complexity and can eliminate The influence of the frequency offset of the resolution can be overcome, and the influence of the dispersion of the signal in the process of atmospheric propagation can be overcome. Include the following steps:

[0039] Demodulate the complex signal of the receiver to extract the transmitted signal;

[0040] For the demodulated signal, the generalized correlation method is used to process the real signal, and the estimated value of time delay is obtained.

[0041] The estimated value of time delay obtained by this method can be used to locate the time difference.

[0042] In the actual communication system, there are a large number of AM and...

Embodiment 2

[0062] This embodiment provides a computer-readable storage medium on which a plurality of instructions / computer programs are stored, and the instructions / computer programs are suitable for being loaded by a processor of a terminal device and executing the method steps described in Embodiment 1, Eliminates the impact of frequency offsets smaller than the frequency resolution on time difference estimation and improves the accuracy of time delay estimation. For the specific steps, please refer to Embodiment 1, which will not be repeated here.

Embodiment 3

[0064] The present invention also provides a device for estimating time difference based on information demodulation correlation, including a processor of a terminal device and a computer-readable storage medium, the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, the The instructions are adapted to be loaded by the processor and execute the method steps as described in Embodiment 1, so as to eliminate the influence of the frequency offset smaller than the frequency resolution on the time difference estimation and improve the accuracy of the time delay estimation. For the specific steps, please refer to Embodiment 1, which will not be repeated here.

[0065] To sum up, the present invention extracts the transmitted signal through the method of signal demodulation, and eliminates the influence of the frequency offset on the time delay estimation. And it gives the specific processing method of time...

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Abstract

The invention discloses a time difference estimation method and device based on information demodulation correlation. The method includes the following steps: performing information demodulation on the complex signal of the receiver, and extracting the transmitted signal; and using generalized correlation for the demodulated signal The real number signal is processed by the method, and the time delay estimation value is obtained. The present invention uses information demodulation, and then performs time delay estimation on the demodulated signal. This method has a small amount of calculation, and can eliminate the influence of the frequency offset smaller than the frequency resolution on the time difference estimation; and reduces the signal propagation process in the atmosphere. The effect of dispersion.

Description

technical field [0001] The invention belongs to the technical field of time difference positioning, in particular to a time difference estimation method and device based on information demodulation correlation. Background technique [0002] Time-of-flight positioning technology has the characteristics of good concealment, fast positioning speed, and high direction-finding positioning accuracy. It has high application value in military and civilian fields, and has been widely studied in academia and industry. In engineering applications, although the parameter settings of two independent receivers are consistent, hardware deviations still exist, resulting in differences in the frequencies of the two IF signals. If the sampling frequency of the receiver is high, the relative bandwidth of the received signal is relatively small. Due to the existence of hardware deviation, there is a frequency difference between the two signals at this time, that is, frequency offset, which will...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/06
CPCG01S5/06
Inventor 胡正郭利强刘军杨青江伟健宋祥瑞张波
Owner CHINA ELECTRONIS TECH INSTR CO LTD