Cooperative time difference estimation method for spectrum aliasing
A technology of time difference estimation and spectrum aliasing, applied in complex mathematical operations, measuring devices, instruments, etc., can solve problems such as failure of common methods, and achieve the effect of reducing the amount of data transmission
Active Publication Date: 2022-04-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004]
Since time difference positioning requires more than 3 signal receiving stations, and the commonly used time difference estimation method is to estimate the signal arrival time difference between two signal receiving stations through one-to-one correlation processing, when the signals received by two signal receiving stations appear spectrum When aliasing, the relationship between the phase difference and frequency variation between the signal spectrum received by two signal receiving stations is no longer linear, so the usual method of determining the time difference estimate by one-to-one correlation processing fails
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[0034] In this example, the number of frequencies received by signal receiving stations 1, 2 and 3 is set to L=32, the interval between adjacent frequency points is δ=5kHz, the time difference search interval is σ=20 nanoseconds, and the speed of light is c=3x10 8 m / s; the distance between signal receiving stations 1 and 2 is d 12 =2027.9 meters, the time difference search grid point is M=2d 12 / (cσ)=338, the distance between signal receiving stations 1 and 3 is d 13 =1947.7 meters, the number of time difference search grid points is N=2d 13 / (cσ)=325; the first 32 elements and the last 32 elements of the 64-dimensional spectrum vectors of signal receiving stations 1, 2 and 3 respectively receive signals are added to obtain the L-dimensional aliasing spectrum vectors respectively as x 1 、x 2 and x 3 ; The time difference search value τ of signal receiving station 2 relative to signal receiving station 1 1m =-d 12 / c+(m-1)σ, m=1,2,...,338; the time difference search value...
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The invention belongs to the technical field of radio positioning, and particularly relates to a collaborative time difference estimation method for spectrum aliasing. The invention provides a collaborative time difference estimation method for spectrum aliasing, and the method comprises the steps: carrying out the 2-to-1 collaborative processing (a second signal receiving station and a third signal receiving station are opposite to a first signal receiving station); according to the invention, before the three signal receiving stations transmit the received signal spectrum data to a signal processing center, the respective signal spectrum data are subjected to aliasing, so that the signal arrival time difference of the two signal receiving stations relative to the other signal receiving station is estimated at the same time under the condition that the data volume is reduced by half; therefore, the purposes that the data transmission quantity required by time difference estimation is reduced by utilizing frequency spectrum aliasing, and the time difference of the second signal receiving station and the third signal receiving station relative to the first signal receiving station is determined by utilizing frequency spectrums after aliasing of the three signal receiving stations in a cooperative mode are achieved.
Description
technical field [0001] The invention belongs to the technical field of radio positioning, and in particular relates to a collaborative time difference estimation method for frequency spectrum aliasing. Background technique [0002] In the field of radio positioning, compared with direction-finding positioning technology, time-difference positioning is a high-precision positioning technology. In the frequency domain, the phase difference between the signal spectrum received by the two signal receiving stations is used, and the slope of the phase difference changing with frequency is determined through frequency domain correlation processing, so that the arrival of a radio signal propagating to the two signal receiving stations can be determined. jet lag. Before correlating the signals received by the two signal receiving stations, the signals received by the two signal receiving stations need to be transmitted to the signal processing center. Communication bandwidth has hig...
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IPC IPC(8): G01S5/02G06F17/16
CPCY02D30/70
Inventor 焦阳万群刘宁彭翔宇夏畅雄刘伟宗刘翼鹏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA