Beidou indoor positioning antenna device

Abstract

The utility model relates to the technical field of indoor positioning, in particular to a Beidou indoor positioning antenna device, which comprises a filter, a time delayer, an attenuator and a duplexer. The filter receives Beidou signal input and separates 1.2 GHz and 1.5 GHz in satellite signals of the Beidou signal, and the 1.2 GHz and the 1.5 GHz enter different processing loops respectively. The filter transmits 1.2 GHz and 1.5 GHz to the time delayer and the attenuator respectively; signals processed by the time delayer and the attenuator are transmitted to the duplexer, and the duplexer synthesizes the processed signals and outputs the synthesized signals to an antenna end. The system provided by the utility model has the advantages of accurate positioning, stable positioning output, enhanced indoor signal capturing capability, improved indoor anti-interference performance, adaptation to various indoor scenes, compatibility with other indoor systems, reduction of long-term cost and simplification of maintenance operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to indoor positioning technical field, concretely is a beidou indoor positioning antenna device. BACKGROUND

[0002] The Beidou satellite navigation system (hereinafter referred to as the Beidou system) is a global satellite navigation system independently developed and operated by China, providing all-weather, all-time, high-precision positioning, navigation and timing services for global users. However, due to the characteristics of satellite navigation signals, the signals cannot cover indoor environments, and the environmental immunity is poor, making it difficult to meet the needs of indoor positioning. Therefore, indoor Beidou positioning technology has emerged to solve the problem of positioning in indoor environments.

[0003] Currently, common indoor positioning technologies include Wi-Fi positioning, Bluetooth positioning, ultra-wideband (UWB) positioning, etc. However, these technologies have certain limitations, such as Wi-Fi positioning with relatively low accuracy, generally within a few meters to tens of meters; Bluetooth positioning is greatly affected by signal strength and environmental interference, and the accuracy is also limited; UWB positioning has high accuracy, but the device cost is high, the deployment is difficult, and the coverage range is relatively small.

[0004] Current indoor positioning technologies have the following disadvantages:

[0005] 1. Signal reception strength problem

[0006] a. Indoor signal attenuation: In indoor environments, the walls, ceilings, and other structures of buildings have a significant shielding and attenuating effect on Beidou satellite signals, resulting in a significant reduction in signal strength. The device needs to solve how to effectively enhance the reception capability of Beidou satellite signals in such a weak signal environment, ensuring that enough strong usable signals can be received, such as using high-gain antenna design, optimizing the radiation pattern of the antenna, increasing the size of the antenna, etc. to improve the ability to capture weak signals.

[0007] b. Multi-path effect interference: The walls, floors, etc. in the room will reflect the signal, causing the signal to pass through different paths to the antenna, producing multi-path effects, causing signal distortion and interference, and affecting positioning accuracy. The invention needs to overcome how to design the antenna and the supporting signal processing mechanism, which can effectively distinguish and suppress multi-path signals, extract the real and effective direct signal, and use special filtering algorithms, antenna polarization adjustment, etc. to reduce the negative effects of multi-path effects.

[0008] 2. Positioning accuracy improvement problem

[0009] a. Complex environment interference suppression: There are a large number of electromagnetic interference sources in the room, such as electromagnetic signals emitted by various electrical equipment, communication base stations and the like, which will interfere with the reception and processing of Beidou satellite signals, and further affect the positioning accuracy. It is necessary to solve how to make the antenna device have good anti-interference ability, and through the use of electromagnetic shielding materials, optimization of the frequency band selectivity of the antenna, etc., to accurately screen out the Beidou signal frequency band and exclude other interference signals, and improve the positioning accuracy.

[0010] b. Adaptability to indoor environment: Different indoor site layouts, space sizes, building materials and the like are quite different, and how to design an antenna device that is universal and can flexibly adapt to various indoor environments is the key. For example, developing an antenna structure with adjustable parameters, or through software algorithm to adapt to different indoor environment characteristics, so as to maintain high positioning accuracy in diversified indoor scenes.

[0011] 3. Cost and maintenance:

[0012] a. Reduce long-term cost: Since the indoor Beidou dual-frequency antenna has high stability and reliability, during long-term use, additional cost investment such as re-calibration, repair and replacement due to inaccurate positioning, frequent faults and the like is reduced. At the same time, its good compatibility makes it possible to make full use of the existing part of the indoor infrastructure for deployment, reducing the overall deployment cost. In the long run, compared with some technical solutions that need to be constantly updated and maintained or multiple systems to achieve similar positioning effect, the cost advantage is obvious.

[0013] b. Simplify maintenance operation: Its stable performance means that the antenna does not need to be frequently debugged and maintained, and the daily maintenance work is relatively simple, only routine inspection is needed, saving manpower, material resources and other resources, and facilitating users to manage and maintain, especially for some application scenarios that need to cover a large area of indoor space and have a large number of antenna devices, the maintenance advantage is more prominent, therefore, a Beidou indoor positioning antenna device is proposed for the above problems. Practical new type content

[0014] The purpose of the present application is to provide a Beidou indoor positioning antenna device to solve the problems raised in the above background art.

[0015] To achieve the above purpose, the present application provides the following technical solutions:

[0016] As an optional solution of the Beidou indoor positioning antenna device, the Beidou indoor positioning antenna device comprises a filter, a time delay device, an attenuator and a diplexer.

[0017] The filter receives a Beidou signal input, and separates 1.2GHz and 1.5GHz in the satellite signal of the Beidou signal input into different processing circuits respectively;

[0018] The filter sends the 1.2GHz and 1.5GHz to the time delay device and the attenuator respectively.

[0019] The signals processed by the time delay device and the attenuator are sent to the diplexer, and the diplexer synthesizes and outputs the processed signals to the antenna end.

[0020] As an optional solution of the Beidou indoor positioning antenna device, the number of the time delay device and the attenuator is three groups, and the time delay device and the attenuator are arranged in series.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] The utility model discloses a kind of integrated three time delay devices+three attenuators+path selection Beidou antenna system, and realizes indoor positioning by multi-path signal reconstruction, with following advantages:

[0023] Precise positioning effect aspect;

[0024] Optimize indoor positioning precision: in complex indoor environment, there is serious signal shielding, multipath effect and various electromagnetic interferences.Indoor Beidou dual-frequency antenna can use dual-frequency signal to more accurately correct ionospheric delay, and combine specific algorithm for indoor multipath situation, accurately distinguish direct signal and reflected multipath signal by more information carried by dual-frequency signal, can effectively reduce the positioning error caused by indoor environment, compared with traditional single-frequency antenna or other indoor positioning technology, can improve positioning precision from several meters to decimeter level or higher, more accurately determine the position of indoor target, such as accurately to specific store location in large shopping mall, accurately navigate to each department ward in hospital.

[0025] Stable positioning output: indoor environment is changeable and has many interference factors, and single-frequency antenna is prone to unstable positioning results due to signal fluctuation, multipath interference, etc.Indoor Beidou dual-frequency antenna relies on dual-frequency cooperative work, even when signal of one frequency band is affected by such as wall reflection, electrical equipment interference, etc., another frequency band can still assist to maintain stable positioning output, so that in the process of long time use in indoor, the accuracy and stability of positioning result can be reliably guaranteed, and abnormal conditions such as positioning "jump" are reduced.

[0026] Signal reception and anti-interference aspect:

[0027] Enhanced indoor signal acquisition capabilities: Indoor building structures can severely obstruct signals. The BeiDou dual-band antenna can cover different frequency bands, increasing the chances of receiving BeiDou satellite signals and broadening the signal reception channels. Even if signals in some frequency bands are weakened due to obstructions from walls, ceilings, etc., signals in another frequency band may still penetrate or diffract into the room and be received by the antenna. This increases the probability of successfully receiving effective signals in weak indoor signal environments, ensuring the normal operation of positioning functions.

[0028] Enhancing Indoor Interference Resistance: Indoor environments are filled with electromagnetic interference from various sources such as Wi-Fi routers, Bluetooth devices, and other electrical appliances. Indoor BeiDou dual-band antennas can be equipped with effective filtering and anti-interference mechanisms for different frequency bands. Through hardware circuit optimization and software algorithms, they accurately filter out interference signals in the indoor environment, allowing only useful BeiDou dual-band signals to pass. Compared to traditional single-frequency antennas or other indoor positioning devices, they are more effective at resisting interference from complex indoor electromagnetic environments, ensuring the quality of received signals and laying a solid foundation for accurate positioning.

[0029] In terms of applicability and compatibility:

[0030] Adaptable to various indoor scenarios: Different indoor venues, such as office buildings, shopping malls, hospitals, and underground parking lots, have different space sizes, building structures, and decoration materials. With its excellent signal reception and positioning performance, the indoor Beidou dual-frequency antenna can flexibly adapt to these diverse indoor environments without the need for large-scale adjustments or redesigns for each scenario. It has strong versatility and is easy to widely promote and apply to various indoor positioning needs.

[0031] Compatibility with other indoor systems: Indoor environments often contain multiple communication and positioning systems, such as Wi-Fi and Bluetooth positioning systems. Indoor BeiDou dual-band antennas are designed to be more compatible with these existing systems. Through reasonable frequency band planning, hardware interface settings, and software protocol interaction, mutual interference can be avoided while information fusion and sharing can be achieved. For example, combining with Wi-Fi systems for comprehensive indoor location determination further improves the comprehensiveness and accuracy of indoor positioning, enhancing its overall usability.

[0032] Cost and maintenance:

[0033] Reduced long-term costs: Due to the high stability and reliability of indoor BeiDou dual-frequency antennas, the additional costs associated with inaccurate positioning and frequent malfunctions, such as recalibration, repair, and replacement, are reduced over long-term use. Furthermore, their excellent compatibility allows for full utilization of existing indoor infrastructure, lowering overall deployment costs. In the long run, compared to some technologies that require continuous updates and maintenance or multiple systems to achieve similar positioning results, the cost advantage is significant.

[0034] Simplified maintenance: Its stable performance means that there is no need for frequent antenna debugging and maintenance. Routine maintenance is relatively simple, requiring only routine checks, which saves manpower and material resources and makes it easier for users to manage and maintain. This advantage of easy maintenance is especially evident in applications that require coverage of large indoor spaces with a large number of antenna devices. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall framework of this utility model. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Example 1: Please refer to Figure 1 This utility model provides a technical solution:

[0038] A Beidou indoor positioning antenna device includes a filter, a time delay unit, an attenuator, and a duplexer;

[0039] The filter receives BeiDou signal input and separates the 1.2GHz and 1.5GHz frequencies from the satellite signal, sending them into different processing loops respectively.

[0040] The filter delivers 1.2GHz and 1.5GHz to the delay unit and attenuator, respectively;

[0041] The signal processed by the time delayer and attenuator is sent to the duplexer, which then synthesizes the processed signal and outputs it to the antenna.

[0042] The number of time delayers and attenuators is three sets each, and the time delayers and attenuators are arranged in series.

[0043] Workflow: Filters separate the 1.2GHz and 1.5GHz frequencies in the satellite signal, allowing them to enter different processing loops. Delay units independently adjust the delay of the satellite signal. Bypasses select the number of delay units and attenuators in the loop to achieve different delay and attenuation values. Attenuators attenuate the satellite signal strength to ensure it is equal to the signal strength of the delay loop. Path selection allows B2 / B5 and B1 band signals to be allocated to delay units and attenuators respectively, enabling more frequency band delay combinations. A duplexer synthesizes the processed signal and outputs it to the antenna.

[0044] Active control of multipath signals: By coordinating the adjustment of time delay and attenuation, multipath signals that are traditionally regarded as interference are transformed into localization feature sources.

[0045] Multi-path selection: Through the path selection circuit, the B2 / B5 and B1 band signals can be allocated to the delay unit and attenuator respectively, thereby realizing more frequency band delay combinations;

[0046] Adjustable delay and attenuation: The delay and attenuation can be modified through the bypass circuit to adapt to complex indoor environments;

[0047] Signal processing logic:

[0048] The antenna array receives multipath BeiDou signals and inputs them into two independent signal processing channels.

[0049] Each channel passes through a delay unit and an attenuator in sequence to adjust the signal delay and strength;

[0050] The duplexer combines the processed signals and outputs them to the antenna.

[0051] The output signal carries path feature information, which is used by the user-end algorithm to calculate the position.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A Beidou indoor positioning antenna device, characterized in that: it comprises a filter, a time delay device, an attenuator and a duplexer; the filter receives Beidou signal input and separates 1.2 GHz and 1.5 GHz in the satellite signal, which respectively enter different processing loops; the filter delivers 1.2 GHz and 1.5 GHz to the time delay device and the attenuator respectively; the signals processed by the time delay device and the attenuator are delivered to the duplexer, which synthesizes and outputs the processed signals to the antenna end.

2. The Beidou indoor positioning antenna device according to claim 1, characterized in that: The number of the time delay device and the attenuator is three, and the time delay device and the attenuator are arranged in series.

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