Positioning system and positioning method based on terrestrial digital radio and television signals
A technology for terrestrial digital TV and broadcasting signals, which is applied in radio wave measurement systems, positioning, and measuring devices. It can solve the problems of simple and accurate detection, and the inability of TDOA positioning technology to achieve accuracy, so as to achieve good performance and reduce complexity. , Reduce the effect of positioning distance error
Active Publication Date: 2017-11-03
SHANGHAI JIAOTONG UNIV
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However, since the time difference extracted by generalized cross-correlation is expressed in integer multiples of the sampling period delay, for discrete digital signals, the generalized cross-correlation extraction time difference technology can only accurately obtain the delay of integer multiples of the sampling period, while the performance Fractional time delays in signal phase cannot be easily and accurately detected
The error limitation of this extraction time difference makes the TDOA positioning technology based on terrestrial digital TV broadcasting unable to achieve high accuracy
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[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and the detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following content.
[0036] figure 1 is a schematic diagram of the TDOA principle of the present invention, such as figure 1 As shown, TDOA positioning is a method of positioning using time difference. Since the absolute time is generally difficult to measure, by comparing the time difference between the TV signals emitted by different terrestrial digital TV transmitters and reaching the positioning receiver, the hyperbola with the signal source as the focus and the distance difference as the long axis can be drawn. The intersection point is the location of the receiver. In the TDOA algorithm, the positi...
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A positioning system based on ground digital radio and television signals comprises a down-conversion and sampling device, a fractional delay TDOA detection device, a receiver position calculation device and a signal-noise ratio estimating device. A positioning method includes the steps that (1) discrete signals are obtained through sampling, (2) related processing is carried out, (3) arrival time difference of signals of integral multiple sampling periods and fractional arrival time difference of different ground digital television emitter signals arriving at a positioning receiver are detected, (4) a total time delay differential is obtained through combination, (5) the total time delay differential is converted to distance, and coordinates of the receiver are obtained through the geometrical relation of the coordinates. By means of the system and the method, on the premise that good performance of integral multiple sampling period delay and low complexity of a system are guaranteed, small multiple sampling period delay can be accurately obtained, error limitations of a sampling period are broken through, precision of the system is improved again, and error estimation and precision compensation are carried out on results of a positioning system in advance through environment detection.
Description
Technical field: [0001] The invention relates to a method for extracting high-precision time difference of arrival by using terrestrial digital television broadcasting signals and performing high-precision positioning by using the time difference of arrival, which belongs to the technical field of wireless communication. Background technique: [0002] Time Difference of Arrival (TDOA, Time Difference of Arrival) is a wireless positioning technology. Different from the technology that uses absolute time positioning, TDOA technology determines the position of the mobile receiving station by detecting the arrival time difference of the signals of two transmitting base stations, rather than the absolute time of arrival, which reduces the time synchronization requirements. [0003] TDOA positioning technology is a research direction of wireless positioning technology. Its main technical characteristics are: TDOA technology is detected by time difference. When calculating TDOA val...
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IPC IPC(8): G01S5/10
CPCG01S5/10
Inventor 王仲豪熊箭归琳刘勃
Owner SHANGHAI JIAOTONG UNIV