CN-122017725-A - Double-frequency direction finding system and method integrating ultra-wideband and Bluetooth

CN122017725ACN 122017725 ACN122017725 ACN 122017725ACN-122017725-A

Abstract

The invention discloses a double-frequency direction finding system and a method for fusing ultra wideband and Bluetooth, wherein the double-frequency direction finding system for fusing ultra wideband and Bluetooth comprises a tag and a base station, wherein the tag and the base station form communication connection, the system also comprises a double-frequency array antenna, the double-frequency array antenna is arranged on the base station, and the double-frequency array antenna is compatible with a 2.4G Bluetooth frequency band and a 4G ultra wideband frequency band. The dual-frequency array antenna is a binary array antenna and comprises an antenna array element I and an antenna array element II, and the distance between the antenna array element I and the antenna array element II is d. The dual-frequency direction-finding system integrating the ultra-wideband and the Bluetooth can enlarge the distance between array elements, improve the isolation between the array elements, inhibit the coupling of the array elements, have robustness to phase noise, improve the direction-finding performance and can be widely applied to the field of wireless positioning.

Inventors

LI JI
XIAO YAN
MA LINLIN
SHI ZHEN
ZHANG HUAILIANG

Assignees

河南省联睿智能科技研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20221213

Claims (6)

1. The double-frequency direction finding system integrating ultra wideband and Bluetooth comprises a label and a base station, wherein the label and the base station form communication connection, the dual-frequency direction finding system integrating the ultra wideband and the Bluetooth also comprises a dual-frequency array antenna, wherein the dual-frequency array antenna is arranged on the base station and is compatible with a 2.4G Bluetooth frequency band and a 4G ultra wideband frequency band; the dual-frequency array antenna is a binary array antenna and comprises an antenna array element I and an antenna array element II, wherein the distance between the antenna array element I and the antenna array element II is d; The calculation method for the distance d between the first antenna array element and the second antenna array element specifically comprises the following steps: Setting the center frequency of the Bluetooth signal as The center frequency of the ultra wideband signal is Then it can be obtained from the phase difference formula: (1); (2); Wherein, the 、 Respectively representing the number of phase ambiguity periods, , Respectively representing the measured phase difference, , Representing different frequencies And Is a wavelength of (2); the combination of formula (1) and formula (2) can be simplified: (3); Further simplification of formula (3) gives: (4); Order the Then the following steps are obtained: (5); As can be seen from formula (5), at a given point In the case of (1) if it is determined that Then Then uniquely determining; setting a phase difference measurement value , Standard deviation of (2) Then The standard deviation of (2) is: (6); Order the Then Expressed in integer plus fractional parts, assuming that the interval of the smallest fractional part where no integer ambiguity exists is ( ), For the fractional part of (2) The representation is made of a combination of a first and a second color, By using The representation is made of a combination of a first and a second color, For noise of (a) The representation is as follows: (7); Wherein, the ; Is provided with The fractional parts in (a) are spaced apart by Then: (8); (9); i.e. without being disturbed by noise, 、 The following conditions need to be satisfied: (10); (11); (12); (13); (14); (15); The combination of formulas (10) to (15) can be obtained: (16); assuming that the standard deviation of the phase difference measurement noise is 10 degrees and the radian value is converted to 10/180=0.056, it can be obtained according to formula (6) Equal to 0.0104, the minimum spacing of the decimal fraction of Q obtainable by formula (16) The requirements are satisfied: (17); According to , And Frequency combination of (2) and (3) interval of fractional parts in Q When the formula (17) is satisfied, it is obtained The range of the value is [1,5], and the distance between the first antenna array element and the second antenna array element is obtained The range of the values is as follows: ; When (when) The range of the decimal place of Q is [0.6097,0.0485] and the range of the decimal place of Q is [1, 5].
2. The dual-band direction finding system integrating ultra wideband and Bluetooth according to claim 1, wherein a first Bluetooth module and a second ultra wideband module are integrated in the tag, a second Bluetooth module and a second ultra wideband module are integrated in the base station, the first Bluetooth module and the second Bluetooth module are both Bluetooth chips, a receiving end can directly obtain IQ value with phase information when receiving the fixed frequency expansion signal, a chip is integrated in the first ultra wideband module, a chip is integrated in the second ultra wideband module, and the chip integrated in the first ultra wideband module and the second ultra wideband module can obtain PDOA information of a dual-band array antenna reaching the base station.
3. The ultra wideband and bluetooth fused dual-frequency direction finding system of claim 2, wherein when In the time-course of which the first and second contact surfaces, And the distance d between the first antenna element and the second antenna element is 7.5cm to 37.5cm.
4. The dual-frequency direction-finding system for fusing ultra-wideband and bluetooth as claimed in claim 1, wherein the method for using the dual-frequency direction-finding system for fusing ultra-wideband and bluetooth for direction-finding specifically comprises the following steps: S1, a tag sends an ultra-wideband poll frame, a base station receives the poll frame and obtains a phase difference PDOA value of a dual-frequency array antenna of the poll frame reaching the base station; S2, the base station sends an ultra-wideband reply frame carrying the phase difference PDOA information of the dual-frequency array antenna of which the poll frame arrives at the base station, the tag receives the ultra-wideband reply frame, ultra-wideband ranging is completed, and ultra-wideband ranging information and the phase difference PDOA information of the dual-frequency array antenna of which the poll frame arrives at the base station are obtained; S3, the tag sends a Bluetooth final frame carrying ultra-wideband ranging information and phase difference PDOA information of the ultra-wideband poll frame reaching the base station, the base station receives the Bluetooth final frame and acquires the phase information IQ value of the Bluetooth module of the base station, the phase difference PDOA information of the ultra-wideband poll frame reaching the base station and the ultra-wideband ranging information; and S4, fusing the phase information IQ value of the Bluetooth module of the base station and the phase difference PDOA information of the ultra-wideband poll frame reaching the base station, thereby obtaining the direction angle.
5. The dual-band direction-finding system of claim 4, wherein in the step S4, firstly, bluetooth phase difference PDOA information of the first antenna element and the second antenna element is obtained by bluetooth phase information IQ value of the first antenna element and bluetooth phase information IQ value of the second antenna element, specifically, if bluetooth phase information IQ value obtained by the first antenna element is I1 and Q1, and bluetooth phase information IQ value obtained by the second antenna element is I2 and Q2, then: (18); (19); (20); Wherein, the Is the bluetooth phase information of the antenna element one, Is the bluetooth phase information of the antenna array element two, The Bluetooth phase difference PDOA information is the Bluetooth phase difference PDOA information of the antenna array element I and the antenna array element II.
6. The dual-frequency direction-finding system for merging ultra wideband and bluetooth as defined in claim 5, wherein the specific step of obtaining the azimuth angle in step S4 is: Let the phase difference PDOA information of the ultra-wideband poll frame reaching the base station be Azimuth angle of Then: (21); (22); Wherein, the And Is the actual bluetooth phase difference value and ultra wideband phase difference value, And For the measured bluetooth phase difference value and ultra wideband phase difference PDOA value, 、 Respectively representing the bluetooth and ultra wideband phase difference blur cycle numbers, , Representing the Bluetooth centre frequency And ultra wideband center frequency And (2) the wavelength of the light source is obtained by combining the formula (21) and the formula (22) and simplifying the formula: (23); Distance between antenna element one and antenna element two When the value range is satisfied, the method comprises the steps of, And Then is in one-to-one correspondence, according to the distance between the first antenna element and the second antenna element Is obtained from the obtained value of (1) The value of (2) can be obtained from the formula (5) And then will Substituting into (23) to obtain azimuth angle 。

Description

Double-frequency direction finding system and method integrating ultra-wideband and Bluetooth The application relates to a double-frequency direction finding system and a method integrating ultra-wideband and Bluetooth, which are applied for the patent application of China, wherein the application number is 202211604764.2, the application date is 2022, 12 and 13. Technical Field The invention belongs to the technical field of communication, and particularly relates to a dual-frequency direction finding system and method integrating ultra-wideband and Bluetooth. Background Ultra-wideband (UWB) technology was first developed in the united states military, and the U.S. Federal Communications Commission (FCC) of 4 months 2002 releases the limitation of the civil permissions of UWB technology, from which UWB technology has gained rapid popularity and development. While FCC allocated a bandwidth of 3.1-10.6GHz for UWB together with 7.5 GHz. Besides, the UWB technology has the advantages of low system complexity, high information security, strong multipath fading resistance and the like, and becomes a big bright point in the field of wireless positioning. The Chinese patent document CN110366105A discloses an ultra-wideband positioning method and device, which respond to the monitoring of first Bluetooth broadcasting data, reset the positioning parameters inconsistent with the positioning parameters indicated by the first Bluetooth broadcasting data in the set positioning parameters, wherein the first Bluetooth broadcasting data comprises at least one of a data transmission channel, a data transmission rate and a data transmission frequency configured by a positioning base station to be communicated, and send positioning signals to the positioning base station based on the currently set positioning parameters and an ultra-wideband positioning mode so as to enable the positioning base station and a positioning server to determine the current position according to the configured ultra-wideband positioning mode. The Bluetooth technology is added in the technical scheme and is used for transmitting the configuration parameters of the tag, the parameter used for automatically resetting the positioning tag and not participating in the measurement of the positioning parameter, and the measurement of the positioning parameter only depends on the ultra-wideband technology. The problem that it wants to solve is how to broadcast data over bluetooth and listen to bluetooth broadcast data. The China patent document CN114430440A discloses a control method, a tag, equipment, a terminal and a storage medium of intelligent equipment, wherein the method is applied to the mobile terminal and comprises the steps of sensing a radio pulse signal sent by an electronic tag in real time by the mobile terminal, setting the electronic tag in a preset range of the intelligent equipment, determining azimuth information between the mobile terminal and the electronic tag according to the radio pulse signal, and sending a corresponding control instruction to the intelligent equipment according to the azimuth information between the mobile terminal and the electronic tag so as to control the intelligent equipment. By the mode, the intelligent device control method and the intelligent device control system can improve the convenience of intelligent device control. In the technical scheme, the angle measurement is only carried out by utilizing the ultra-wideband technology, and the Bluetooth signal is used for the connection of equipment and the transmission of control signals and does not participate in the angle measurement. The Chinese patent document CN114495569A discloses a positioning vehicle searching system, a vehicle searching method and a vehicle based on an ultra-wide technology, wherein the system comprises a vehicle machine end, a mobile end, a Bluetooth key and an ultra-wide band positioning base station assembly, the mobile end is used for sending a positioning vehicle searching request to the vehicle machine end and receiving vehicle position information fed back by the vehicle machine end, the vehicle machine end is used for activating the ultra-wide band positioning base station assembly after receiving the positioning vehicle searching request and receiving distance information fed back by the ultra-wide band positioning base station assembly, the Bluetooth key is internally provided with an ultra-wide band positioning tag, the ultra-wide band positioning base station assembly comprises four ultra-wide band positioning base stations, the four ultra-wide band positioning base stations are respectively positioned around a vehicle, and are in communication connection with the ultra-wide band positioning tag and used for sending a distance measuring request to the ultra-wide band positioning tag and measuring the distance between the ultra-wide band positioning tag after the ultra-wide band positioning base station returns the informa