CN-122028174-A - TDOA positioning method and system

CN122028174ACN 122028174 ACN122028174 ACN 122028174ACN-122028174-A

Abstract

The invention discloses a TDOA positioning method and a TDOA positioning system, which are applied to the technical field of signal positioning, wherein the method comprises the steps of processing uplink sounding reference signal data received by a plurality of base stations to obtain discrete channel response data, carrying out interpolation processing on the discrete channel response data to obtain a frequency domain channel vector, carrying out frequency domain oversampling processing on the frequency domain channel vector to obtain an oversampled frequency domain vector, carrying out time domain conversion processing on the oversampled frequency domain vector based on a fast Fourier transform technology to obtain time domain channel impulse response data, carrying out peak search processing on the time domain channel impulse response data by utilizing a peak detection technology, and inputting the obtained arrival time data into a positioning system to be processed to obtain a TDOA positioning result. The method provided by the invention can solve the technical problems of time difference measurement errors and positioning deviation caused by SRS detection peak value deviation in TDOA positioning.

Inventors

QIU TAO
LIANG XIJIE
WANG YONG
ZHANG JUMING

Assignees

广州广哈通信股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. A TDOA location method applied to a location system including at least a plurality of base stations, comprising: performing channel estimation processing on uplink sounding reference signal data received by a plurality of base stations to obtain discrete channel response data; Performing interpolation processing on the discrete channel response data by using a position adaptive segmentation filtering interpolation technology to obtain a frequency domain channel vector, wherein the position adaptive segmentation filtering interpolation technology dynamically selects a filtering vector based on the position of a subcarrier; Performing frequency domain oversampling processing on the frequency domain channel vector to obtain an oversampled frequency domain vector; Performing time domain conversion processing on the oversampled frequency domain vector based on a fast Fourier transform technology to obtain time domain channel impulse response data; And carrying out peak search processing on the time domain channel impulse response data by using a peak detection technology, and inputting the obtained arrival time data into the positioning system for processing to obtain a TDOA positioning result.
2. A TDOA location method as defined in claim 1, wherein performing channel estimation processing on uplink sounding reference signal data received by a plurality of base stations to obtain discrete channel response data includes: performing channel estimation processing on the uplink sounding reference signal data to obtain a subcarrier channel estimation value; And processing the subcarrier channel estimation value by utilizing a frequency domain discretization technology to obtain the discrete channel response data.
3. A TDOA location method as defined in claim 1, wherein interpolating the discrete channel response data using a location adaptive piecewise filtering interpolation technique to obtain a frequency domain channel vector, comprises: Performing interpolation processing on the discrete channel response data by using a position self-adaptive segmentation filtering interpolation technology to obtain frequency domain channel data after interpolation; And integrating the frequency domain channel data after interpolation to obtain the frequency domain channel vector.
4. A TDOA location method as defined in claim 1, wherein performing time domain transformation on the oversampled frequency domain vector based on a fast fourier transform technique to obtain time domain channel impulse response data comprises: performing time domain conversion processing on the oversampled frequency domain vector by using a fast Fourier transform technology to obtain a complex time domain sequence; and carrying out amplitude calculation processing on the complex time domain sequence to obtain the time domain channel impulse response data.
5. A TDOA location method as defined in claim 1, wherein the performing peak search processing on the time domain channel impulse response data using peak detection technology, inputting the obtained arrival time data to the location system for processing, and obtaining a TDOA location result includes: Performing peak search processing on the time domain channel impulse response data by using a peak detection technology to obtain the arrival time data; And processing the arrival time data by using a TDOA resolving technology in the positioning system to obtain the TDOA positioning result.
6. A TDOA location system, comprising: The estimation module is used for carrying out channel estimation processing on the uplink sounding reference signal data received by the plurality of base stations to obtain discrete channel response data; The interpolation module is used for carrying out interpolation processing on the discrete channel response data by utilizing a position self-adaptive segmentation filtering interpolation technology to obtain a frequency domain channel vector, wherein the position self-adaptive segmentation filtering interpolation technology dynamically selects a filtering vector based on the position of a subcarrier; The over-sampling module is used for performing frequency domain over-sampling processing on the frequency domain channel vector to obtain an over-sampled frequency domain vector; The conversion module is used for carrying out time domain conversion processing on the oversampled frequency domain vector based on a fast Fourier transform technology to obtain time domain channel impulse response data; and the processing module is used for carrying out peak search processing on the time domain channel impulse response data by utilizing a peak detection technology, and inputting the obtained arrival time data into the positioning system for processing to obtain a TDOA positioning result.
7. A TDOA location system as defined in claim 6, wherein performing channel estimation processing on uplink sounding reference signal data received by a plurality of said base stations to obtain discrete channel response data includes: performing channel estimation processing on the uplink sounding reference signal data to obtain a subcarrier channel estimation value; And processing the subcarrier channel estimation value by utilizing a frequency domain discretization technology to obtain the discrete channel response data.
8. A TDOA location system as recited in claim 6, wherein interpolating the discrete channel response data using a location adaptive piecewise filtering interpolation technique to obtain a frequency domain channel vector comprises: Performing interpolation processing on the discrete channel response data by using a position self-adaptive segmentation filtering interpolation technology to obtain frequency domain channel data after interpolation; And integrating the frequency domain channel data after interpolation to obtain the frequency domain channel vector.
9. A TDOA location system as recited in claim 6, wherein the performing time domain transformation on the oversampled frequency domain vector based on a fast fourier transform technique to obtain time domain channel impulse response data comprises: performing time domain conversion processing on the oversampled frequency domain vector by using a fast Fourier transform technology to obtain a complex time domain sequence; and carrying out amplitude calculation processing on the complex time domain sequence to obtain the time domain channel impulse response data.
10. A TDOA location system as recited in claim 6, wherein the peak detection technique for peak searching the time domain channel impulse response data, inputting the obtained time of arrival data to the location system for processing, comprises: Performing peak search processing on the time domain channel impulse response data by using a peak detection technology to obtain the arrival time data; And processing the arrival time data by using a TDOA resolving technology in the positioning system to obtain the TDOA positioning result.

Description

TDOA positioning method and system Technical Field The invention relates to the technical field of signal positioning, in particular to a TDOA positioning method and system. Background In the 5G NR system, an uplink Sounding reference signal (Sounding REFERENCE SIGNAL, SRS) is widely used for physical layer functions such as channel state information acquisition, beamforming, and link adaptation. Along with the evolution of the 5G to the sense of general integration, SRS gradually becomes a key signal resource for realizing high-precision positioning. In the prior art, the TDOA location method generally relies on the arrival time difference of the uplink sounding reference signal to arrive at a plurality of base stations to perform position calculation, but in the location process, the correlation detection peak value of the sounding reference signal is offset, resulting in the deviation of the time difference measurement value from the actual physical propagation delay, thereby generating systematic time estimation errors and further generating location deviation. Disclosure of Invention The invention provides a TDOA positioning method and a TDOA positioning system, which solve the technical problems of time difference measurement errors and positioning deviation caused by SRS detection peak value deviation in TDOA positioning. In order to solve the technical problems, the invention provides a TDOA positioning method, which comprises the following steps: performing channel estimation processing on uplink sounding reference signal data received by a plurality of base stations to obtain discrete channel response data; Performing interpolation processing on the discrete channel response data by using a position adaptive segmentation filtering interpolation technology to obtain a frequency domain channel vector, wherein the position adaptive segmentation filtering interpolation technology dynamically selects a filtering vector based on the position of a subcarrier; Performing frequency domain oversampling processing on the frequency domain channel vector to obtain an oversampled frequency domain vector; Performing time domain conversion processing on the oversampled frequency domain vector based on a fast Fourier transform technology to obtain time domain channel impulse response data; And carrying out peak search processing on the time domain channel impulse response data by using a peak detection technology, and inputting the obtained arrival time data into the positioning system for processing to obtain a TDOA positioning result. As one preferable scheme, performing channel estimation processing on uplink sounding reference signal data received by a plurality of base stations to obtain discrete channel response data, including: performing channel estimation processing on the uplink sounding reference signal data to obtain a subcarrier channel estimation value; And processing the subcarrier channel estimation value by utilizing a frequency domain discretization technology to obtain the discrete channel response data. As one of the preferable schemes, interpolation processing is performed on the discrete channel response data by using a position adaptive piecewise filtering interpolation technology to obtain a frequency domain channel vector, including: Performing interpolation processing on the discrete channel response data by using a position self-adaptive segmentation filtering interpolation technology to obtain frequency domain channel data after interpolation; And integrating the frequency domain channel data after interpolation to obtain the frequency domain channel vector. As one of the preferred schemes, based on the fast fourier transform technology, performing time domain conversion processing on the oversampled frequency domain vector to obtain time domain channel impulse response data, including: performing time domain conversion processing on the oversampled frequency domain vector by using a fast Fourier transform technology to obtain a complex time domain sequence; and carrying out amplitude calculation processing on the complex time domain sequence to obtain the time domain channel impulse response data. As one of the preferred schemes, peak detection technology is utilized to perform peak search processing on the time domain channel impulse response data, the obtained arrival time data is input to the positioning system for processing, and a TDOA positioning result is obtained, including: Performing peak search processing on the time domain channel impulse response data by using a peak detection technology to obtain the arrival time data; And processing the arrival time data by using a TDOA resolving technology in the positioning system to obtain the TDOA positioning result. The present invention further provides a TDOA location system, including: The estimation module is used for carrying out channel estimation processing on the uplink sounding reference signal data received by the pluralit