A time-frequency difference joint calculation method and system
A calculation method and technology of time-frequency difference, applied in the field of signal processing, can solve the problem of low calculation accuracy of time-frequency difference
Active Publication Date: 2021-11-09
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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[0007] The present invention provides a method and system for joint calculation of time-frequency difference, which is used to solve the problem of low calculation accuracy of time-frequency difference in existing fitting algorithms and interpolation algorithms
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[0059] The invention provides a time-frequency difference joint calculation method and system, which are used to solve the problem of low calculation accuracy of the time-frequency difference in the existing fitting algorithm and interpolation algorithm.
[0060] To achieve the above object, the technical solution provided by the invention is:
[0061] A time-frequency difference joint calculation method, comprising the steps of:
[0062] (1) Two-way signal acquisition is performed on the same target radiation source, and the collected two-way target radiation source signals are time-synchronized;
[0063] (2) Transform the obtained two-way signals by using the mutual ambiguity function, and use the time difference and frequency difference corresponding to the peak value of the mutual ambiguity function as the time difference initial value and the frequency difference initial value of the target radiation source signal;
[0064] (3) Select a set number of sampling points with...
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The present invention provides a time-frequency difference joint calculation method and system. The calculation method includes the following steps: collecting two signals of a target radiation source at the same time; using a mutual ambiguity function to transform the two signals, and taking the time corresponding to the peak value of the mutual ambiguity function The frequency difference is used as the initial value of the time-frequency difference of the target radiation source signal; select a set number of sampling points within the set range of the mutual ambiguity function peak, and assign them to the fitting group or interpolation group; the fitting group is The objective function, the interpolation group is the restriction condition, constitutes the planning function about the three-dimensional quadratic paraboloid, and transforms the planning function into a standard second-order cone model; uses the convex optimization method to solve the second-order cone model, and obtains the approximation surface function The coefficients of each item in ; and calculate the final time-frequency difference according to the coefficients of each item in the approximation surface. In the technical solution provided by the invention, the signal of the target radiation source is properly transformed before fitting and interpolation calculation, so that the obtained time-frequency difference is more accurate.
Description
technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a time-frequency difference joint calculation method and system. Background technique [0002] Passive positioning refers to the technology that the investigator does not radiate electromagnetic waves, but only monitors, locates and tracks targets by receiving electromagnetic wave signals radiated, retransmitted or reflected by the target. Among them, the time-frequency difference passive positioning system has received more and more attention and attention due to its advantages of high positioning accuracy, low equipment requirements, and easy engineering implementation, and is widely used in military and civilian fields. [0003] In the commonly used two-step positioning method, the positioning accuracy depends on the estimation accuracy of time-frequency difference parameters. At present, there are many methods for estimating the time-frequency differenc...
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IPC IPC(8): G06F17/15
CPCG06F17/15
Inventor 胡德秀刘智鑫赵拥军赵泽亚赵勇胜刘亚奇黄洁
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU