Narrow-band signal TDOA (time difference of arrival) positioning method and device based on time difference calculation
A narrowband signal and positioning method technology, applied in positioning, measuring devices, instruments, etc., can solve the problems of narrow bandwidth, low precision, and good broadband signal effect of narrowband signals, and achieve the effect of improving performance and improving accuracy.
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Embodiment 1
[0048] The purpose of Embodiment 1 is to provide a narrowband signal TDOA positioning method based on time difference calculation.
[0049] In this embodiment, the receivers of the two measuring stations are set to receive signals from the same radiation source, and the received signals are respectively the first signal x(t) and the second signal y(t), and the expressions are as follows:
[0050] x(t)=s(t)+n 1 (t)
[0051] y(t)=As(t-D)+n 2 (t)
[0052] where D is the time delay that needs to be calculated. no 1 (t) and n 2 (t) is noise. A is the ratio of the amplitudes of the two signals. In order to improve the anti-interference performance, the existing generalized correlation time delay calculation method is to add the first filter H after x(t) and y(t)1 (f), the second filter H 2 (f) Perform preprocessing, then pass through an integrator, calculate a square, and finally perform peak detection.
[0053] However, the digitally down-converted local oscillation signal...
Embodiment 2
[0079] The purpose of Embodiment 2 is to provide a computer-readable storage medium.
[0080] In order to achieve the above object, the present invention adopts the following technical scheme:
[0081] A computer-readable storage medium, in which a plurality of instructions are stored, and the instructions are adapted to be loaded by a processor of a terminal device and perform the following processing:
[0082] Receiving narrowband signals from the same radiation source received by different measurement stations;
[0083] Respectively remove the relative frequency offset value between the narrowband signals for frequency offset correction;
[0084] Calculate the time difference based on the narrowband signal after frequency offset correction, and perform TDOA positioning.
[0085] In this embodiment, examples of the computer-readable recording medium include magnetic storage media (for example, ROM, RAM, USB, floppy disk, hard disk, etc.), optical recording media (for examp...
Embodiment 3
[0087] The purpose of Embodiment 3 is to provide a narrowband signal TDOA positioning device based on time difference calculation.
[0088] In order to achieve the above object, the present invention adopts the following technical scheme:
[0089] A narrow-band signal TDOA positioning device based on time difference calculation, using a computing terminal device, including a processor and a computer-readable storage medium, the processor is used to implement each instruction; the computer-readable storage medium is used to store multiple instructions, the The instructions are adapted to be loaded by the processor and perform the following processes:
[0090] Receiving narrowband signals from the same radiation source received by different measurement stations;
[0091] Respectively remove the relative frequency offset value between the narrowband signals for frequency offset correction;
[0092] Calculate the time difference based on the narrowband signal after frequency off...
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