Time difference estimation method using frequency spectrum principal component
A technology of time difference estimation and principal component, which is applied to measurement devices, radio wave measurement systems, instruments, etc., can solve problems such as low data transmission volume, and achieve the effect of reducing data volume
Active Publication Date: 2022-04-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
In practical application scenarios, when the communication bandwidth between two signal receiving stations is limited or the amount of data reliably transmitted per unit time is limited, the time difference estimation method based on the correlation processing of two signals is no longer applicable, and it is necessary to develop a low-cost High-precision Time Difference Estimation Method for Data Transmission Amount
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[0029] In this example, the number of frequencies received by signal receiving stations 1 and 2 is set to L=32, the interval between adjacent frequency points is δ=5kHz, and the inverse Fourier transform length is N=16384; signal receiving stations 1 and 2 receive The 32-dimensional spectrum vector of the signal is x 1 、x 2 ; The time difference vector is T represents the vector transpose; the inverse Fourier transform matrix of order N×N is F, and the m row and n column elements are m=1,2,...,M, n=1,2,...,N; the time difference between signal receiving station 2 and signal receiving station 1 is -1.6582 microseconds.
[0030] In the case that the signal-to-noise ratio of the signal receiving station 1 and 2 is 14.0dB, the time difference between the signal receiving station 2 and the signal receiving station 1 determined by using the 32-dimensional spectrum vector through the correlation processing of the two signals is estimated to be 80% The error is less than 71.3 nan...
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The invention belongs to the technical field of radio positioning, and particularly relates to a time difference estimation method using a frequency spectrum principal component. According to the low data transmission quantity time difference estimation method using the frequency spectrum principal component provided by the invention, the frequency spectrum principal component is extracted by using the signal frequency spectrum data through one signal receiving station, and then the frequency spectrum principal component data of which the data quantity is reduced by half is transmitted to the other signal receiving station for time difference estimation; therefore, the purpose of reducing the amount of data required to be transmitted by half while determining high-precision time difference estimation by using wider frequency spectrum information is achieved.
Description
technical field [0001] The invention belongs to the technical field of radio positioning, and in particular relates to a time difference estimation method using frequency spectrum principal components. Background technique [0002] When two signal receiving stations receive signals from the same radio radiation source, the phase difference between the signal spectrum received by the two signal receiving stations is proportional to the frequency. Since the signal bandwidth of the radio radiation source is wider, the time difference estimation The higher the accuracy, therefore, time difference positioning is an important high-precision radio positioning technology. [0003] For continuous communication signals, it is difficult to determine the signal arrival time difference by two signal receiving stations respectively determining the signal arrival time. Correlation processing of two signals received by a signal receiving station determines an estimate of the time differenc...
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Login to View More IPC IPC(8): G01S5/02
CPCG01S5/02Y02D30/70
Inventor 万群刘宁吴祺邹继锋胡泽鹏倪丽花夏畅雄
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA