CN102026367B - Device, method and system for testing distance between devices - Google Patents
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Abstract
The invention provides a device, a method and a system for testing distance between devices. The method comprises the steps of: making a virtual wireless network card as the first wireless access point AP, sending a feedback signal to the second device through the first wireless access point AP, and obtaining the distance between the first device and the second device, wherein the distance is calculated by the first device or the second device through the feedback signal. Applying the technology provided by the invention, by making a virtual wireless network card as a new wireless access point AP on the wireless network card, sending a feedback signal through the AP and detecting the distance between the two through the feedback signal, the original network of the devices is not be influenced by transmitting the feedback signal through the new wireless access point AP, and the detection is performed in the network constructed by the first device and the second device, no longer depending on the distance between the third party devices.
Description
Technical Field
The present invention relates to a device positioning technology, and more particularly, to a device, a method for testing a distance between devices, and a system thereof.
Background
With the wide application of devices, especially mobile devices, there are a variety of application prospects for measuring the distance between mobile devices, for example, when desktop projection software on a portable computer is applied in a meeting process, and some data is projected to the other party, it is difficult to judge which specific target device is the currently projected target device, and the name of the computer needs to be identified, but the identification method is too complicated.
In the prior art, the distance can be judged by sound, but the method is greatly influenced by the environment and is basically not feasible. Although the positioning technology supported by the WiFi standard system is mature, it needs to be determined by the signal strength received by the Access Point (AP), so that only the distance between the mobile device and the AP can be obtained, but the distance between two mobile devices cannot be accurately obtained.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: when two or more mobile devices detect the distance between each other, the detection is affected too much by the surrounding environment, or the technical means adopted in the detection is too dependent on the support of other third-party devices.
Disclosure of Invention
The invention aims to provide a device, a method and a system for testing the distance between devices, which are used for solving the defects that in the prior art, when the distance between two or more mobile devices is detected, the influence of the ambient environment is too large, or technical means adopted in the detection is too dependent on the support of other third-party devices.
A method of detecting a distance between devices, comprising: a virtual wireless network card is used as a first wireless access point AP; sending a feedback signal to the second device through the first wireless Access Point (AP); and acquiring a distance between the first equipment and the second equipment, wherein the distance is calculated by the first equipment according to the feedback signal or the second equipment according to the feedback signal.
In the above method, the first wireless access point AP is located on the first device; the first equipment establishes a first network through the first wireless access point AP; and the first device sends the feedback signal in the first network.
In the above method, a second network further exists between the first device and the second device; negotiating with the second device to establish the first network over the second network; in the negotiation process, at least the network identification SSID of the first network needs to be determined.
In the above method, obtaining a distance between the first device and the second device further includes: receiving a feedback signal from a second device through a second wireless Access Point (AP), wherein the second AP is generated by a virtual wireless network card of the second device; the distance is calculated by the first device from the feedback signal or the second device from the feedback signal.
In the above method, the feedback signal is specifically a beacon message; a distance correspondence table for recording the correspondence between the signal strength and the distance of the beacon message is stored in the first device or the second device; and the first equipment or the second equipment searches the distance corresponding table according to the signal strength of the beacon message and obtains the distance between the first equipment and the second equipment.
In the above method, before the step of using the virtual wireless network card as the first wireless access point AP, the method further includes: selecting a detection strategy, wherein at least a main testing party initiating detection is determined to be first equipment, and a tested party is second equipment; the detection strategy further comprises: the announcement frequency, the announcement period, the total test time length and the timeout timer length of the beacon message, and the realization of time synchronization between the first equipment and the second equipment are confirmed.
In the above method, the obtaining a distance between the first device and the second device further includes: acquiring the distance calculated by the second equipment according to the feedback signal; or, the distance is calculated according to the feedback signal forwarded by the second device.
An apparatus, comprising: the wireless network card control unit is used for virtualizing a wireless network card as a first wireless Access Point (AP); a signal unit, configured to generate a feedback signal, where the feedback signal reaches the second device through the first wireless access point AP; and the distance measuring unit is used for acquiring a distance between the first equipment and the second equipment, wherein the distance is calculated by the first equipment according to the feedback signal or the second equipment according to the feedback signal.
In the above-mentioned equipment, still include: a negotiation unit, configured to negotiate to establish a first network through a second network between the second device and the second device, where the feedback signal is transmitted in the first network; the signal unit is specifically a beacon message unit and is used for generating a beacon message as the feedback signal; and the distance correspondence table unit is used for storing a distance correspondence table, recording the correspondence between the signal strength of the beacon message and the distance in the distance correspondence table, searching the distance correspondence table according to the signal strength of the beacon message, and acquiring the distance between the second device and the distance correspondence table.
A system for testing the distance between devices, comprising at least: the system comprises a first device and a second device, wherein the first device is a main measuring party; the first equipment virtualizes a wireless network card as a wireless Access Point (AP); the second device receives a feedback signal from the first device through the wireless Access Point (AP); and the second equipment calculates the distance between the first equipment and the second equipment according to the feedback signal or the feedback signal forwarded by the first equipment.
By applying the technology provided by the embodiment, a wireless network card is virtualized on the wireless network card to serve as a new wireless access point AP, a feedback signal is sent through the AP, the distance between the wireless network card and the AP is detected according to the feedback signal, and the original network of the equipment is not influenced because the feedback signal is sent through the new wireless access point A; and the distance between the devices is detected in the network constructed by the first device and the second device without depending on the distance between the devices detected by the third-party device.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method applied to a portable computer in a meeting according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a system for testing a distance between devices according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical features and implementation effects of the present invention clearer, the technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. In the embodiment provided by the invention, the distance between different devices is measured based on the wireless network card technology.
A method of testing the distance between devices, as shown in fig. 1, comprising:
By applying the technology provided by the embodiment, a wireless network card is virtualized on the wireless network card to serve as a wireless access point AP without passing through the distance between the original network detection devices, and the distance between the two parties is detected through the AP without being influenced by the surrounding environment.
On the basis of the existing embodiment, the invention provides a preferred embodiment and improves the technical scheme.
The wireless network card is located on the first device, so that the virtual first wireless access point AP of the wireless network card is located on the first device, and the first device obtains a distance calculated by the first device itself or the second device according to the feedback signal, further comprising: acquiring a distance value calculated by the second equipment according to the feedback signal; or, the distance value is calculated according to the feedback signal forwarded by the second device.
Since the second device receives the feedback signal through the first wireless access point AP, a network for transmitting the feedback signal needs to be established between the first device and the second device, and a network Identifier (SSID) of the network is distinguished from an existing network between the first device and the second device, and is called a first network.
Then, after the first device virtualizes a wireless network card as the first wireless access point AP, the method further includes: the first equipment and the second equipment establish a first network through the first wireless access point AP; and the first device sends the feedback signal in the first network.
The network shared between the two is called a second network; in this shared second network, the first device negotiates with the second device; in the negotiation process, at least one specific network identifier SSID needs to be determined, namely the SSID is a usable service set identifier and has a specific value; and then, establishing a first network between the first device and the second device according to the negotiation result, wherein the network identifier of the first network adopts the SSID.
Therefore, in the process of measuring the distance between the first network and the second network, the connection of the first network and the second network is not needed to be interrupted, the work of a user is not hindered, and the user experience is improved.
The negotiation process further includes selecting a detection strategy, where at least a main testing party initiating the test is determined to be the first device and a tested party is determined to be the second device. The detection strategy further comprises: the announcement frequency, the announcement period, the total length of the test time and the length of the timeout timer of the beacon message; and confirming that time synchronization is achieved between the first device and the second device. By adopting the technical scheme, the distance measurement can be carried out in the second network constructed by the first device and the second device, and the third-party device is not required to be relied on.
And adopting a Shirley Peak wireless chip as a chip of a wireless network card of the first device, wherein the feedback signal is specifically a Beacon (Beacon) message. The Beacon message sent by the first equipment is sent in a wireless network newly established by the first equipment; therefore, the connection between the equipment and the original network is not needed to be influenced in the process of detecting the distance, and the method is practical, simple and convenient.
In the detection strategy, a main testing party and a tested party can be preset to realize role exchange, and if the tested party also adopts a Shirley peak wireless chip, a wireless network card can be virtualized to be used as a wireless access point AP, so that the original main testing party can be used as a new tested party to perform reverse testing, and the accuracy is improved. The specific examples provided are: the method further comprises the following steps after the first device acquires the distance between the first device and the second device: the second device virtualizes a wireless network card as a second wireless access point AP; the first device receives a feedback signal from the second device through the second wireless Access Point (AP); the first device or the second device can determine the distance between the first device and the second device according to the feedback signal; since the feedback signal is generated by the first device, the first device may determine the distance between the two according to the strength of the feedback signal, and the second device may determine the distance between the two according to the strength of the feedback signal after receiving the feedback signal.
On different operating system platforms, there are different implementation modes, and the wireless network card manufacturer will also give the function call interface of the bottom layer. For example, in Windows XP (an operating system), Network Driver Interface Specification (NDIS) and IEEE 802.11Network adapter Design Guidelines for Windows XP may be referred to, and when the call parameter is selected as OID _802_11_ RSSI, the strength of the wireless signal may be returned, and since the strength of the signal is inversely proportional to the distance, the signal strength may represent the distance. Optionally, a signal strength and distance correspondence table may also be preset, that is, a distance correspondence table for recording a correspondence relationship between a signal strength and a distance of the Beacon packet is stored in the first device or the second device; the first equipment searches the distance corresponding table according to the signal intensity of the Beacon message to obtain the distance between the first equipment and the second equipment; and the second equipment searches the distance corresponding table according to the signal intensity of the Beacon message to acquire the distance between the second equipment and the first equipment. The Beacon message is a specific implementation manner of the feedback signal.
When the distance between the measured party and the feedback signal is determined, further obtaining single or multiple test results, and screening the test results to obtain a screening result; the final distance is calculated according to the screening result, for example, an arithmetic mean or a geometric mean may be directly obtained, or a median may be obtained, or an arithmetic mean may be obtained after filtering the highest and lowest values.
In the process of determining a network identifier SSID, the information to be exchanged is basic parameters and a test method/step for testing the network, which specifically comprises the following steps:
the announcement frequency, the total announcement period and the total test time length of the Beacon message, the length of a timeout timer required by the announcement frequency, the total announcement period and the test time length, and the like; and determining that time synchronization is achieved between the main party and the party to be measured.
The default mode can be preset in the specific method, and the exchange is not required to be carried out every time.
By applying the technology provided by the embodiments, the original network of each device can not be influenced when the distance is detected, and the distance detection can be realized under some extreme conditions. For example,
and the first equipment informs the second equipment during negotiation, and a new wireless network is started as the first network after 2 minutes for distance test, but the two sides do not agree on the SSID of the first network at the moment.
After receiving the notification, the second device starts to monitor beacon announcements of all wireless networks, and finds the new AP signal after about 2 minutes, that is, the second device finds the first wireless access point AP. And receiving a feedback signal through the first wireless access point AP, and calculating the distance between the first wireless access point AP and the second wireless access point AP according to the feedback signal.
To help disclose the above embodiments, the present application provides a preferred embodiment describing a meeting scenario, i.e. several devices are needed in a meeting, without loss of generality, the devices being specifically portable computers: the wireless Network card comprises a computer A, a computer B and a computer C, wherein in the process of keeping Network connection, a chip of the wireless Network card in each computer can virtualize another wireless Network card as an AP, so that a Personal Area Network (PAN) and a Wireless Local Area Network (WLAN) can be seamlessly integrated. The three computers need to determine the distance between each other, and the method specifically comprises the following steps:
The parameters that computer a and computer B need to negotiate further include: the frequency of test announcements, total announcement period and total length of time tested, and thus the length of timeout timer required, etc.; and determining that time synchronization is achieved between the main party and the party to be measured.
And step 204, the virtual wireless network card of the main testing party is used as a wireless access point AP, and a network is established with the tested party, wherein the network identifier of the network is the SSID 2.
And step 206, the computer A receives a feedback signal from the computer B of the tested party forwarded by the AP in the SSID2 network, and determines the distance between the computer A and the tested party according to the feedback signal.
The strength of the feedback signal is inversely proportional to the distance, and thus the signal strength may be indicative of the distance.
And 208, if the computer A and the computer B are both required to be used as main measuring parties according to the selected detection strategy, then the measuring party and the measured party in the subsequent measuring process are changed.
Designating the computer B as a main measuring party, and the computer A becomes a measured party at the moment; the distance between the two is calculated again according to the steps 204 to 207. If the distance does not match the distance measured when the computer A is the main measuring side, the processing is performed according to a predetermined processing rule.
By applying the technology provided by the embodiment of the invention, a specific wireless network card is adopted, the wireless network card can virtualize another wireless network card to be used as an AP, a network identification SSID special for measuring the distance is negotiated between two devices, a network is established according to the SSID, the AP can be regarded as a HUB of the network, and the distance between the AP and the AP is measured according to the strength of a feedback signal in the network.
Correspondingly to the method, an embodiment of the present invention provides an apparatus, which detects a distance from a second apparatus, as shown in fig. 3, including:
a wireless network card control unit 302, configured to virtualize a wireless network card as a first wireless access point AP, and connect a second device through the first wireless access point AP;
a signal unit 301 for generating a feedback signal, which reaches the second device via the connection;
a distance measuring unit 303, configured to obtain a distance between the first device and the second device, where the distance is calculated by the first device according to the feedback signal or by the second device according to the feedback signal.
By applying the technology provided by the embodiment, the distance between the original network detection devices is not passed, but a wireless network card is virtualized on the wireless network card to be used as a wireless access point AP, and the distance between the two parties is detected by the AP, so that the influence of the surrounding environment is avoided, and the original network connection of each device is not influenced.
The apparatus may further comprise:
a negotiation unit, configured to negotiate, through a second network between the second device and the first network, to establish a first network, where the first network is used to transmit the feedback signal;
the signal unit is specifically a beacon message unit and is used for generating a beacon message as the feedback signal;
and the distance correspondence table unit is used for storing a distance correspondence table, recording the correspondence between the signal strength of the beacon message and the distance in the distance correspondence table, searching the distance correspondence table according to the signal strength of the beacon message, and acquiring the distance between the second device and the distance correspondence table.
A negotiation auxiliary unit, configured to determine, in a working process of the negotiation unit, a beacon message announcement frequency, a total announcement period, a total length of time for testing, and a length of an timeout timer; and confirming that time synchronization is achieved between the first device and the second device.
An embodiment of the present invention further provides a system for testing a distance between devices, as shown in fig. 4, the system at least includes:
the system comprises a first device and a second device, wherein the first device is a main measuring party;
the first equipment virtualizes a wireless network card as a wireless Access Point (AP);
the second device receives a feedback signal from the first device through the wireless Access Point (AP);
and the second device determines the distance between the first device and the second device according to the feedback signal or the feedback signal forwarded by the first device. Both the first device and the second device are originally in an existing WLAN, and the network identifier of the WLAN is SSID 0.
By applying the technology provided by the embodiment, a wireless network card is virtualized on the wireless network card to serve as a new wireless access point AP, a feedback signal is sent through the AP, the distance between the wireless network card and the AP is detected according to the feedback signal, and the original network of the equipment is not influenced because the feedback signal is sent through the new wireless access point AP; and the distance between the devices is detected in the network constructed by the first device and the second device without depending on the distance between the devices detected by the third-party device.
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting, and all the values of the parameters can be adjusted according to the actual situation, and are within the scope of the claims. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and shall be covered by the appended claims.
Claims (9)
1. A method of detecting a distance between devices, comprising:
a second network exists between the first device and the second device; negotiating with the second device through the second network to establish a first network;
the first equipment virtualizes a wireless network card as a first wireless Access Point (AP);
the first equipment establishes the first network through the first wireless access point AP;
the first device sends a feedback signal to the second device through the first wireless access point AP in the first network;
and acquiring the distance between the first equipment and the second equipment, wherein the distance is calculated by the first equipment according to the feedback signal or the second equipment according to the feedback signal.
2. The method of claim 1,
in the negotiation process, at least the network identification SSID of the first network needs to be determined.
3. The method of claim 1, wherein obtaining a distance between the first device and the second device further comprises:
receiving a feedback signal from a second device through a second wireless Access Point (AP), wherein the second AP is generated by a virtual wireless network card of the second device;
the distance is calculated by the first device from the feedback signal or the second device from the feedback signal.
4. The method according to claim 1 or 3, characterized in that the feedback signal is in particular a beacon message;
a distance correspondence table for recording the correspondence between the signal strength and the distance of the beacon message is stored in the first device or the second device;
and the first equipment or the second equipment searches the distance corresponding table according to the signal strength of the beacon message and obtains the distance between the first equipment and the second equipment.
5. The method of claim 1, wherein before the virtualizing a wireless network card as the first wireless access point AP, further comprises:
selecting a detection strategy, wherein at least a main testing party initiating detection is determined to be first equipment, and a tested party is second equipment;
the detection strategy further comprises:
the announcement frequency, the announcement period, the total test time length and the timeout timer length of the beacon message, and the realization of time synchronization between the first equipment and the second equipment are confirmed.
6. The method of claim 1, wherein obtaining a distance between the first device and the second device further comprises:
acquiring the distance calculated by the second equipment according to the feedback signal;
or,
and calculating the distance according to the feedback signal forwarded by the second equipment.
7. An apparatus, comprising:
a negotiation unit, configured to negotiate to establish a first network through a second network between the first network and a second device, where a feedback signal sent by the device is transmitted in the first network;
the wireless network card control unit is used for virtualizing a wireless network card to serve as a first wireless Access Point (AP), and the first wireless Access Point (AP) is used for establishing a first network between the equipment and the second equipment;
a signal unit configured to generate a feedback signal, where the feedback signal reaches the second device through the first wireless access point AP in the first network;
a distance determining unit for obtaining a distance between the device and the second device, the distance being calculated by the device from the feedback signal or the second device from the feedback signal.
8. The apparatus of claim 7, further comprising:
the signal unit is specifically a beacon message unit and is used for generating a beacon message as the feedback signal;
and the distance correspondence table unit is used for storing a distance correspondence table, recording the correspondence between the signal strength of the beacon message and the distance in the distance correspondence table, searching the distance correspondence table according to the signal strength of the beacon message, and acquiring the distance between the second device and the distance correspondence table.
9. A system for measuring the distance between devices, comprising:
the system comprises a first device and a second device, wherein the first device is a main measuring party;
the first device comprises a negotiation unit, which is used for negotiating and establishing a first network through a second network between the first device and the second device, and a feedback signal sent by the first device is transmitted in the first network;
the first equipment virtualizes a wireless network card as a wireless Access Point (AP); the first equipment establishes a first network through the first wireless access point AP;
the second device receives a feedback signal from the first device through the wireless Access Point (AP) in the first network;
and the second equipment calculates the distance between the first equipment and the second equipment according to the feedback signal or the feedback signal forwarded by the first equipment.
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