CN100438466C - Signal detection system and method - Google Patents

Abstract

A signal detection system and method are applied to a wireless local area network positioning system, and the signal detection system comprises: the device comprises a database, a reading module, a signal receiving module, a judging module and a confirming module; the invention mainly reads out the signal intensity data of the logic area from the database, receives the signal sent by at least one access point in the area, selects the access point with the strongest signal intensity, judges whether the access point exists in the high-precision positioning area after the access point with the strongest signal is in the use state, retrieves the corresponding logic area signal intensity distribution diagram from the database when the access point exists in the high-precision positioning area, and then executes the positioning operation according to the precision of the logic area; the signal detection system and the method can detect the access point of the wireless local area network positioning system before the positioning operation is executed, thereby improving the positioning accuracy.

Description

Signal detection system and method

technical field

The present invention relates to a signal detection system and method, in particular to a wireless local area network positioning signal detection system and method.

Background technique

Due to continuous breakthroughs and innovations in computer hardware and software technology, it has become a fashion to use the network to transmit information, communicate with each other, and share resources. In recent years, the more common use of network communication is the Local Area Network (LAN).

With the emergence of various mobile devices, such as notebooks and PDAs, people are increasingly eager to break through geographical restrictions and access the network anytime and anywhere, so wireless networks have become quite popular in recent years. At present, personnel or research institutions in the information field have proposed various wireless data transmission technical specifications and standards, among which the wireless local area network (Wireless LAN: WLAN) adopting the IEEE802.11 technical standard is the most similar to the traditional wired Internet method and habit. Moreover, Wireless LAN can meet the needs of "wireless Internet access anytime, anywhere". Functionally, it can transmit data, video, multimedia and use various services on the Internet, and the connection fee is gradually reduced to the acceptable range of ordinary consumers. Therefore, Wireless LAN has become one of the mainstream ways of wireless Internet access.

Wireless LAN technology is becoming more and more mature, and providing positioning services in a wireless LAN environment has become an important function of wireless LAN technology. Generally speaking, WLAN is mainly responsible for providing wireless access services by one or more access points (Access Point, AP), any mobile unit (Mobile Unit, MU) will choose the strongest signal strength, usually the nearest The AP is connected to the network. Since the AP is basically pre-installed in a fixed location, the current regional location of the MU can be calculated through the signals transmitted by at least three APs. The principle is similar to the traditional global satellite positioning system (GPS). At the same time, people have higher and higher requirements for the accuracy of positioning services. How to determine the user's location more accurately and improve the positioning accuracy has become an important research issue in the industry.

Currently, the WLAN positioning service in actual application is realized based on receiving signal strength indications. In order to improve the positioning accuracy, the existing methods generally include two types. The first is to change the physical structure, that is, increase the number of APs in places with poor positioning accuracy, select APs with strong and stable transmission signal power, and arrange APs at higher positions with an asymmetric distribution. Increase the signal collection density of sample points, prolong the signal collection time, and select high-sensitivity wireless network cards; in addition, there is a method to improve the positioning accuracy by changing the algorithm, that is, taking the average number of several received values during the positioning process As input parameters as well as prior estimates are estimated as known information during tracking, including various advanced decision theories as well as probabilistic models.

On the other hand, in order to meet the requirements of different users for different positioning accuracy, the developer also proposes a solution for logical division of wireless network areas. This logical division method is to divide multiple logical areas with different positioning accuracy according to the requirements of different positioning accuracy. In the area with low accuracy, only the position of the mobile device in a certain larger area can be obtained; In an area with high accuracy, a certain position point in the area can be further located. This logical area division method can be set according to actual needs, such as access point density and other cost-related settings, making the wireless local area network positioning system more economical and efficient.

The above-mentioned method of using wireless local area network to realize positioning can certainly provide a low-cost and effective solution, but it must be taken into account that the signal transmission status of wireless local area network may be unstable from time to time, which will affect the stability of wireless local area network positioning system accuracy and precision. Therefore, how to provide a system and method that can be applied in the WLAN positioning system to detect the access point of the WLAN positioning system before performing the positioning calculation and improve the positioning accuracy has become an urgent issue to be solved.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a signal detection system and method, which can detect the access point of the wireless local area network positioning system before performing the positioning operation, so as to improve the accuracy of positioning.

In order to achieve the above and other purposes, the signal detection system of the present invention is applied in a wireless local area network positioning system, and the signal detection system detects whether an access point located in a logical area sends information for the wireless local area network positioning system to perform positioning operations, The signal detection system includes: a database for storing logical area-related data and at least one access point-related data corresponding to the logical area-related data; a reading module for reading the logical area-related data and the access point Relevant data; a signal receiving module, configured to receive a signal sent by at least one access point in the logical area; a judging module, configured to determine the access point with the strongest signal strength from the signals sent by the at least one access point; and a confirmation module, configured to confirm whether the judged access point with the strongest signal strength is in a normal use state, and make the reading module read from the database the data related to the access point to which the access point belongs and the The logical area related data corresponding to the access point related data confirms whether the logical area exists in the high-precision positioning area, and is used for the wireless local area network positioning system to calculate the positioning signal according to the judgment result.

With the signal detection system, the method for performing signal detection includes: making the signal detection system receive a signal sent by at least one access point in a logical area; making a signal receiving module of the signal detection system send a signal from the at least one access point determine the access point with the strongest signal strength; and make the signal detection system confirm whether the determined access point with the strongest signal strength is in a normal use state, and read according to the access point in the normal use state The access point related data to which the access point belongs and the logical area related data corresponding to the access point related data are used to confirm whether the logical area exists in the high-precision positioning area, and the positioning signal is calculated according to the judgment result.

Compared with the existing signal detection technology, the signal detection system and method of the present invention can detect the access point of the wireless local area network positioning system before performing the positioning operation, and reduce the workload of measuring the signal strength density map and a lot of purchased hardware according to the accuracy requirements The cost of equipment; in addition, in high-precision areas, only the signal strength density map of the area is used for algorithm matching, so the number of matching can be greatly reduced, the speed of operation can be improved, and the accuracy of positioning can be improved.

Description of drawings

Fig. 1 is the basic structural diagram of the signal detection system of the present invention; And

Fig. 2 is a flowchart of the signal detection method of the present invention.

Detailed ways

Example

The implementation of the present invention is described below by means of specific examples.

1 is a basic structure diagram of the signal detection system of the present invention. As shown in the figure, the signal detection system 1 of the present invention includes: a database 11, a reading module 13, a signal receiving module 15, a judgment module 17 and a confirmation module 19.

In this embodiment, the signal detection system 1 of the present invention is applied in a wireless local area network positioning system 2 . The wireless local area network positioning system 2 has at least one logical area that has been logically divided, and the logical division is to divide the wireless local area network according to the existing building structure, space layout or user's own usage habits. The so-called logical area means that the user has specific positioning accuracy requirements within the scope of the logical area, which may not exist in the actual space or layout. For example, a logical area with high positioning accuracy can be a museum, a hospital, or a prison. In this logical area, the positioning information of a person or object to be located must be accurate in which exhibit placement area, hospital bed, or cell; low positioning accuracy The logical area of degree can be an office or a school. In this logical area, the location information of the person or object to be located only needs to be accurate to which floor or classroom. Of course, the signal detection system 1 of the present invention is not limited to this wireless area network positioning system, and it is applicable to all types of wireless area network positioning systems.

The database 11 is used for storing logical area related data and access point related data. In this embodiment, the database 11 further stores detection project related information, logical area related information, access point related information, detection point related information and related signal strength information. Among them, the relevant information of the detection project includes the detection project number, project name, signal density map collection mode, wireless local area network map, sample point sampling average time, project establishment time, etc.; the relevant information of the logical area includes area number, domain name, positioning accuracy Mode, information description, project number, coordinates of representative points in the area, etc.; the access point related information includes access point number, multimedia access address, area number, access point coordinates, etc.; the detection point related information includes detection point The location number, name, time, coordinates, area number, etc.; the relevant signal strength information includes signal strength number, access point number, measurement point number, area number, signal strength value, etc.

The reading module 13 is used for reading logical area related data and access point related data from the database 11 . In this embodiment, when the signal detection system 1 of the present invention performs signal detection, system initialization will be performed. During the initialization process, the reading module 13 will read the detection project number, project name, Signal density map acquisition mode, wireless LAN map, sample point sampling average time, project establishment time and other relevant information about the detection project, as well as area number, domain name, positioning accuracy mode, information description, project number, coordinates of representative points in the area, etc. Information about the logical area.

The signal receiving module 15 is used for receiving a signal sent by at least one access point in the logical area. In this embodiment, the WLAN positioning system 2 includes at least one logical area, and there is at least one access point in the logical area. In order to obtain a more accurate positioning point, there are at least three access points in the logical area. The access point calculates the location of the detection point by applying a pattern matching method. In order to receive the signal sent by the access point and then calculate the location of the detection point according to the signal, the signal receiving module 15 is preferably built in a mobile device (not shown) for the user to perform a mobile test. The mobile device can be, for example, a mobile phone, a personal digital assistant, a notebook computer, and other data processing devices that are portable and support wireless local area network functions.

The judging module 17 is used for judging the access point with the strongest signal strength from the signals sent by the at least one access point. In this embodiment, assuming that the logical area where the detection point is located can receive the signals sent by the three access points, then when the signal receiving module 15 receives the signals sent by the three access points, the judging module 17 It is then determined which of the three access points has the strongest signal strength. The criterion for judging the signal strength may be achieved, for example, by detecting received signal strength indications (Received Signal Strength Indication; RSSI) of channels between the station and multiple access points.

The confirmation module 19 is used to confirm whether the judged access point with the strongest signal strength is in a normal use state, and whether the access point in a normal use state exists in a high-precision positioning area for the wireless local area network positioning system Based on the judgment result, a positioning signal is calculated. In this embodiment, when the judging module 17 judges which of the three access points has the strongest signal strength, the confirmation module 19 then retrieves the access point with the strongest signal strength from the database. point and determine whether it is set to the normal use state, when the access point with the strongest signal strength is set to the normal use state, then the confirmation module 19 will further judge the location of the access point with the strongest signal strength. Logical area; Conversely, when the access point with the strongest signal strength is set to an abnormal use state, then the confirmation module 19 immediately excludes the data about the access point with the strongest signal strength in the database, and needs It is particularly noted that in this case, the confirmation module 19 immediately transmits a signal to notify the judgment module 17, so that the judgment module 17 can re-judge which of the remaining access points has the strongest signal strength, and repeat the above confirmation module. 19 confirmation process. After the confirmation module 19 completes the confirmation, the WLAN positioning system 2 can perform such as positioning calculations.

Fig. 2 is the process steps of the signal detection method of the present invention.

In step S201, the database 11 is configured to store logical area related data and access point related data. Then proceed to step S202.

In step S202 , the reading module 13 is instructed to read logical area related data and access point related data from the database 11 . In this embodiment, when the signal detection system of the present invention performs signal detection, system initialization will be performed. During the initialization process, the reading module 13 will read the detection project-related information and logical area-related information from the database 11. information etc. Then proceed to step S203.

In step S203, the signal receiving module 15 is configured to receive a signal sent by at least one access point in the logical area. In this embodiment, the wireless local area network positioning system 2 includes at least one logical area, and there are at least three access points in the logical area. In addition, in order to receive the signal transmitted by the access point and then calculate the location of the detection point according to the signal, the signal receiving module 15 is preferably built in the mobile device. The mobile device can be, for example, a mobile phone, a personal digital assistant, a notebook computer, and other data processing devices that are portable and support wireless local area network functions. Then proceed to step S204.

In step S204, the judging module 17 is made to judge the access point with the strongest signal strength from the signals sent by the at least one access point. In this embodiment, assuming that the logical area where the detection point is located can receive the signals sent by the three access points, then when the signal receiving module 15 receives the signals sent by the three access points, the judging module 17 It is then determined which of the three access points has the strongest signal strength. The criterion for judging the signal strength can be, for example, by detecting the received signal strength indication of the channel between the station and multiple access points, the packet error rate, or judging the average signal time in each channel by detecting an idle channel to determine which access point relatively busy. Then proceed to step S205.

In step S205, the confirmation module 19 is instructed to confirm whether the determined access point with the strongest signal strength is in a normal use state. In this embodiment, when the judging module 17 judges which of the three access points has the strongest signal strength, the confirmation module 19 then retrieves the connection with the strongest signal strength from the database 11. Whether the entry point is set as a normal use state, if yes, go to step S206; if not, go to step S207.

In step S206, make the confirmation module 19 confirm whether the access point with the strongest signal strength in the normal use state exists in the high-accuracy positioning area, and send the confirmation result to the wireless local area network positioning system 2, and perform Subsequent positioning operations.

In step S207 , the confirmation module 19 excludes the access point with the strongest signal strength in the database 11 , and sends a signal to the judgment module 17 . Then return to step S204.

In summary, through the signal detection system and method of the present invention, the access point of the wireless local area network positioning system can be detected before the positioning operation is performed, and the workload of measuring the signal strength density map and the cost of purchasing many hardware devices can be reduced according to the accuracy requirements ; In addition, only the signal strength density map of the area is used for algorithm matching in high-precision areas, so the number of matching can be greatly reduced, the speed of operation can be improved, and the accuracy of positioning can be improved.

Claims (14)

1. a signal detection system is applied in the wireless local network positioning system, is used to detect the access point that is positioned at logic region and whether sends information, uses for this wireless local network positioning system location computing, it is characterized in that this signal detection system comprises:

Database, be used for the stored logic Regional data and with corresponding at least one the access point related data of this logic region related data;

Read module is used to read this logic region related data and access point related data;

Signal receiving module is used to receive the signal that at least one access point sends in this logic region;

Judge module is used for judging the strongest access point of signal strength signal intensity from the signal that this at least one access point sends; And

Confirm module, be used to confirm whether the strongest access point of this signal strength signal intensity of judging is in normal operating condition, and make this read module from this database read under this access point the access point related data and with the pairing logic region related data of this access point related data, confirm whether this logic region is present in the pinpoint accuracy locating area, calculate framing signal according to this judged result for this wireless local network positioning system.

2. the system as claimed in claim 1 is characterized in that, this signal receiving module is built and put in mobile device.

3. system as claimed in claim 2 is characterized in that, this mobile device is to have data processing equipment portable and the support wireless lan function.

4. system as claimed in claim 3 is characterized in that, this data processing equipment be mobile phone, personal digital assistant and notebook computer one of them.

5. the system as claimed in claim 1 is characterized in that, the criterion of the signal strength signal intensity of this judge module is to reach by the mode that the received signal intensity of channel between measuring station and a plurality of access point is indicated.

6. the system as claimed in claim 1, it is characterized in that, this affirmation module also is used for when confirming that the strongest access point of this signal strength signal intensity is set to unusual user mode, the access point that relevant this signal strength signal intensity is the strongest in this database is got rid of, and transmitted this judge module of signalisation.

7. system as claimed in claim 6 is characterized in that, this judge module also is used for behind the signalisation that receives this affirmation module, and the signal strength signal intensity that rejudges which access point in the remaining access point is the strongest.

8. signal detecting method, be applied in the signal detection system that is provided with stored logic Regional data and the access point related data corresponding with this logic region related data, and this signal detection system has signal receiving module, this signal detecting method is used to detect the access point that is positioned at logic region and whether sends information with the usefulness as the location computing, it is characterized in that this signal detecting method comprises:

Make the signal that at least one access point sends in this signal detection system receive logic zone;

Make the signal receiving module of this signal detection system from the signal that this at least one access point sends, judge the strongest access point of signal strength signal intensity; And

Make this signal detection system confirm whether the strongest access point of this signal strength signal intensity of judging is in normal operating condition, and according to the access point of this normal operating condition read under this access point the access point related data and with the pairing logic region related data of this access point related data, confirm that whether this logic region is present in the pinpoint accuracy locating area, calculates framing signal according to this judged result.

9. method as claimed in claim 8 is characterized in that the signal receiving module of this signal detection system is built and put in mobile device.

10. method as claimed in claim 9 is characterized in that, this mobile device is to have data processing equipment portable and the support wireless lan function.

11. method as claimed in claim 10 is characterized in that, this data processing equipment be mobile phone, personal digital assistant and notebook computer one of them.

12. method as claimed in claim 8 is characterized in that, the criterion of the signal strength signal intensity of this signal detection system is to reach by the mode that the received signal intensity of channel between measuring station and a plurality of access point is indicated.

13. method as claimed in claim 8 is characterized in that, this signal detection system also when confirming that the strongest access point of this signal strength signal intensity is set to unusual user mode, get rid of by the access point that relevant this signal strength signal intensity in this database is the strongest.

14. method as claimed in claim 13 is characterized in that, after this signal detection system was got rid of the access point that relevant this signal strength signal intensity is the strongest in this database, the signal strength signal intensity that rejudges which access point in the remaining access point was the strongest.

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