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A positioning method and device based on time difference calculation of narrowband signal tdoa

A narrowband signal and time difference technology, which is applied in the field of narrowband signal TDOA positioning method and device based on time difference calculation, can solve the problems of narrow bandwidth, low precision, and difficulty of narrowband signals to achieve higher precision, etc., to improve accuracy and performance. Effect

Active Publication Date: 2020-02-14
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Description
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AI Technical Summary

Problems solved by technology

However, in the actual environment, the bandwidth of narrowband signals sent by walkie-talkies, false alarm devices and other equipment is narrow. The narrower the bandwidth of the signal, the wider the correlation function corresponding to the time domain will be, and the lower the accuracy of the time difference estimation algorithm will be. , it is difficult to achieve high accuracy for time difference estimation of narrowband signals
The traditional generalized correlation time delay estimation algorithm works well for wideband signals, but compared with wideband signals, the effect of time delay estimation for narrowband signals is worse

Method used

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  • A positioning method and device based on time difference calculation of narrowband signal tdoa
  • A positioning method and device based on time difference calculation of narrowband signal tdoa

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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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Abstract

The invention discloses a narrow-band signal TDOA positioning method and device based on time difference calculation. The method includes: receiving narrow-band signals from the same radiation source received by different measuring stations; Offset correction: Calculate the time difference based on the narrowband signal after frequency offset correction, and perform TDOA positioning. The invention aims at narrow-band signals, and improves the calculation accuracy of time difference by eliminating the frequency deviation of signals from two receivers, and finally improves the performance of the TDOA positioning system.

Description

technical field [0001] The invention belongs to the technical field of passive positioning, and in particular relates to a narrowband signal TDOA positioning method and device based on time difference calculation. Background technique [0002] Compared with active positioning, passive positioning does not need to emit electromagnetic waves. Passive positioning determines the position of the target by receiving electromagnetic waves emitted by the target radiation source. The TDOA positioning technology in passive positioning has especially attracted extensive attention in the industry. The TDOA positioning technology has the advantages of high positioning accuracy and easy networking. The first problem to be solved in TDOA positioning is to calculate the time difference between the same signal arriving at different receivers. [0003] Time delay, that is, the calculation of time difference is used in many engineering application fields. Therefore, the calculation of time de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/00
CPCG01S5/00
Inventor 胡正郭利强杨青刘军
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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