CN103487785A - Wireless positioning information system - Google Patents

Abstract

A wireless positioning information system includes at least one semi-industrial wireless LAN access point. Any semi-industrial wireless LAN access point includes a Wifi signal transmitter, a GPS receiving module and a processor. The GPS receiving module receives the positioning or time information of the GPS satellite. The processor adds the positioning or time information to the SSID in the beacon frame broadcast signal, and the Wifi signal transmitter transmits the beacon frame broadcast signal. The access point includes a photovoltaic cell and an energy storage battery. The receiving range of the wireless LAN client is changed by adjusting the transmission power of the Wifi signal transmitter, and the positioning accuracy of the wireless LAN client is adjusted by controlling the receiving range of the wireless LAN client. Users can obtain location or time information using a general WiFi terminal. There is no need to set up power lines, and the system is easy to set up and install with low cost.

Description

A wireless positioning information system

technical field

The invention relates to the electrical field, in particular to wireless electronic communication technology, in particular to a wireless positioning information system.

Background technique

GPS positioning technology is becoming more and more popular. There are many general-purpose GPS chips and modules in the market, and GPS control commands have already established industrial standards in the industry. Most of the software and hardware of GPS products can be used interoperably. GPS can provide precise geographic location positioning information and accurate global time information. However, many wireless devices such as notebook computers and Wifi client devices do not add GPS chips or modules because of power saving, manufacturing cost saving, or volume factors. In the prior art, when a user of a Wifi wireless terminal device without a GPS chip needs to obtain GPS information, he must additionally purchase an additional GPS device and install related driver software, which not only requires an increase in hardware investment, but also requires more power consumption. In addition, the GPS device also needs to wait for a period of time to start working during the start-up phase.

In addition, due to the popularity of various notebook computers and mobile terminals such as iPod, iPhone, and iPad, Wireless Fidelity communication (Wireless Fidelity, hereinafter referred to as WiFi) has become a common specification for various handheld terminal devices. The first version of the IEEE 802.11 protocol was published in 1997, which defined the medium access control layer (MAC layer) and the physical layer. The communication between two devices can be carried out freely and directly (ad hoc), or it can be carried out under the coordination of a base station (Base Station,) or an access point (Access Point). Later, various 802.11 standards such as 802.11a/b/g/n were developed, but because the 2.4GHz ISM frequency band is commonly used by most countries in the world, 802.11b has been the most widely used. The basic components of a WiFi network include a Station, a Basic Service Set, a Distribution System, and an Access Point. When searching for a Wifi Access Point, 802.11a/b /g/n is compatible. WiFi has become a common infrastructure for enterprises. Any WiFi standard equipment can work without difference anywhere in the world. Wifi wireless LAN is very easy to be found. In order to enable users When the existence of a wireless network is discovered, the access point sends a beacon frame (beacon frame) with specific parameters, and the access point broadcasts the service identification number SSID (Service Set Identifier) once in groups of beacon frames at regular intervals. The default The interval time is 100ms, the transmission rate of the beacon frame packet is 1 Mbit/s, and the length is quite short, so this broadcast action has little impact on network performance. The minimum transmission rate stipulated by standard WiFi is 1 Mbit/s, To ensure that all Wi-Fi clients can receive this SSID broadcast packet, the client can decide whether to connect to the AP of this SSID. The user can set which SSID to connect to. The WiFi system always Open its connection standard to client, and support roaming.The present invention utilizes this characteristic of WiFi, will send the various information of client by the SSID broadcast in the beacon frame of WiFi standard, and Wifi client receives SSID immediately Location information, time information and service information can be disassembled.

Contents of the invention

The purpose of the present invention is to provide a kind of wireless positioning information system, and described wireless positioning information system will solve the need for additional hardware support when acquiring GPS positioning or timing information, or Technical problems such as excessive power consumption or long waiting time for positioning.

This wireless positioning information system of the present invention comprises at least one half-work wireless local area network access point, wherein, any one described half-work wireless local area network access point all respectively comprises a Wifi signal transmitting device, a GPS receiving module and a Processor, described processor is connected with described GPS receiving module, and processor is connected with described Wifi signal transmitting device again, utilizes GPS receiving module to receive the positioning information or time information of GPS satellite, and processor receives module from GPS Receive positioning information or time information and add the positioning information or time information to the SSID in the beacon frame broadcast signal, and use the Wifi signal transmitting device to transmit the beacon frame broadcast signal.

Further, the semi-working wireless local area network access point includes a photovoltaic cell, and the current output terminal of the photovoltaic cell is connected with the Wifi signal transmitting device, the GPS receiving module and the processor.

Further, the semi-working WLAN access point includes an energy storage battery, the energy storage battery is connected to the current output terminal of the photovoltaic battery through a charging circuit, and the energy storage battery is used to store electric energy from the photovoltaic battery.

Further, the semi-working WLAN access point includes a power management circuit, the power management circuit is connected with the processor and the energy storage battery, and the processor monitors the remaining power of the energy storage battery through the power management circuit, and utilizes The processor adjusts the signal transmission power of the Wifi signal transmitting device or the transmission time interval of two adjacent beacon frame broadcast signals according to the remaining power of the energy storage battery.

Further, the semi-working WLAN access point includes a memory device, the memory device is connected to the processor, the memory device is used to store preset information, and the processor is used to add the preset information to the beacon frame The SSID in the broadcast signal is transmitted through the Wifi signal transmitting device. the

Further, the receiving range of the wireless local area network client is changed by adjusting the transmitting power of the Wifi signal transmitting device, and the positioning accuracy of the wireless local area network client is adjusted by controlling the receiving range of the wireless local area network client.

Further, a working period is preset in the processor, and the processor is used to cut off the power supply of the Wifi signal transmitting device at a time other than the working period, and the processor itself enters a sleep power-saving state.

Further, during the working period, the processor is used to detect the remaining electric energy of the energy storage battery through the power management circuit, and when the remaining electric energy of the energy storage battery is greater than or equal to 50% of its full capacity, the processor is used to control the Wifi signal The transmitting device transmits the SSID every 100-200 milliseconds. When the remaining power of the energy storage battery is less than 50% of its full capacity and greater than or equal to 10% of its full capacity, the processor is used to control the Wifi signal transmitting device every half The SSID is transmitted once every second to one second. When the remaining power of the energy storage battery is less than 10% of its full capacity, the processor is used to cut off the power supply of the Wifi signal transmitter, and the processor itself enters a dormant power-saving state.

Further, the beacon frame broadcast signal of the half-duplex wireless local area network access point conforms to the IEEE 802.11 protocol.

Further, a Wifi signal detection module is provided in the half-work wireless local area network access point, and the Wifi signal detection module is connected with the processor, and the Wifi signal detection module is used to transmit the beacon frame broadcast signal First detect whether there are other 802.11 device transmission signals around, and then send the SSID broadcast signal when no other 802.11 device transmission signals are detected.

Further, more than two semi-duplex wireless local area network access points may be set in different geographic locations to provide positioning services for more than two positioning points.

The working principle of the present invention is: the half-work wireless local area network access point obtains its geographic location and satellite timing time through its built-in GPS module, adds the positioning information and time information to the SSID broadcast by the Wifi signal transmitting device, and enters the half-work All Wifi terminals within the transmission range of the wireless LAN access point can receive the SSID broadcast of the Wifi signal transmitting device, thereby parsing the positioning information of the half-work wireless LAN access point, and taking it as its own positioning position. The positioning accuracy of the Wifi terminal is determined by The transmission range of the broadcast of the Wifi signal transmitting device is determined, and the smaller the transmission range of the broadcast of the Wifi signal transmitting device, the higher the positioning accuracy of the Wifi terminal.

Specifically, when the half-work wireless LAN access point sends the beacon frame broadcast signal, put the GPS positioning information or GPS time information in the SSID of the beacon frame broadcast signal, and send it out in the form of a non-IP address via the Wifi signal transmitting device .

The part of the electricity generated by the photovoltaic cell that is not immediately consumed by the Wifi signal transmitter and processor is stored in the energy storage battery for use when there is no light energy to generate electricity. The transmission time interval of the beacon frame broadcast signal will change with the remaining power capacity of the energy storage battery. When the remaining power is less, the transmission time interval between two adjacent beacon frames becomes longer.

Because in many places, there will be no users who need GPS information services during specific periods of time, the processor is preset for working periods and non-working periods. During the non-working periods, the power of the Wifi signal transmitter is cut off, and the processor enters a dormant state. Power saving state to conserve power in the energy storage battery.

Compared with the prior art, the present invention has positive and obvious effects. The present invention utilizes the wireless local area network access point to broadcast the precise geographic location, and after the wireless local area network client without GPS function enters the signal coverage range of the wireless local area network access point, the precise positioning of the coverage area can be obtained from the SSID, thereby realizing wireless roaming positioning The present invention can also send the precise time of GPS in the SSID, so that the wireless local area network client can accurately synchronize the time, and the user can obtain the position or time information by using a general-purpose WiFi handheld device or a notebook computer. Because it adopts solar energy power supply, WiFi access points can provide accurate location, time and other information services without erecting power lines. The system is easy to erect and install, and the cost is low. The adjustment of positioning accuracy can be realized by adjusting the transmission power.

Description of drawings

Fig. 1 is a schematic block diagram of the wireless positioning information system of the present invention.

Fig. 2 is a schematic diagram of an embodiment of the wireless positioning information system of the present invention.

Fig. 3 is a schematic diagram of an embodiment of the wireless positioning information system of the present invention in a small signal coverage area.

Fig. 4 is a schematic diagram of an embodiment of the wireless positioning information system of the present invention in a larger signal coverage area and positioning in an overlapping and crossing manner.

Detailed ways

Example 1:

As shown in Figure 1, the wireless positioning information system of the present invention includes at least one half-work wireless local area network access point 1, and any half-work wireless local area network access point 1 all respectively includes a Wifi signal transmitting device 11, a processor 13 and a GPS memory device 14, after the processor 13 receives the GPS information from the GPS receiving module 14, when the semi-working wireless LAN access point 1 sends the beacon frame broadcast signal, the positioning information of the GPS or the GPS time information are placed in the The SSID in the broadcast signal of the beacon frame is sent by the Wifi signal transmitting device 11 .

Further, the broadcast method adopts the IEEE 802.11 protocol, that is, WiFi.

SSID is a proper term for 802.11 wireless network. Each client WiFi device will receive the SSID sent by the access point, and the SSID can be up to 32 characters in length. The SSID is to be displayed to the user, so usually the SSID exists in a form that can be read by humans. However, the 802.11 standard does not stipulate that it must be in human-readable character form, as long as it is 2 to 32 octet characters, it can be used as SSID.

The wireless broadcast beacon frame is a normal layer 2 frame of the 802.11 protocol (sent once every 100ms by default), which can be legally obtained by the general accessor without any credentials, which contains the name field of the SSID service identification number of the WLAN. Therefore, in the basic framework embodiment of the present invention, any Wifi client 2 that enters the effective range of the wireless transmission signal of the half-work WLAN access point 1 can receive the broadcast signal of the half-work WLAN access point 1 , the client 2 can get the GPS information in the SSID after receiving the broadcast beacon frame of the half-work WLAN access point 1, and the client 2 does not need to connect to the WLAN. Therefore, the half-work WLAN access point 1 GPS information can be sent to the client without receiving capability. Although the half-work wireless local area network access point 1 only needs to transmit broadcast beacon frames, and does not need the receiving ability to achieve the function of broadcasting GPS information, if a full-featured chip with transceiver capability is used, the half-work access of the present invention can also be realized. The entry point, although the wireless receiving capability of the chip will be wasted, the overall cost will not increase significantly. In this embodiment, only a Wifi signal transmitting device is needed to realize the present invention, but it is not limited to an access point that only has transmitting capability.

The wireless local area network client 2 can be a handheld wireless device such as an iPad, an iPhone, etc., or a laptop computer.

Example 2:

As shown in Figure 2, Embodiment 2 adds a Wifi signal detection module 12, a photovoltaic cell 16, an energy storage battery 17, and a memory device 18 to the basic structure of Fig. Used by the signal transmitting device 11 and the processor 13, the electric energy generated by the photovoltaic cell 16 is not immediately used by the present invention 11 and the processor 13 and is stored in the energy storage battery 17 for use when there is no light energy to generate electricity , and the transmission time interval of the beacon frame broadcast signal of the half-work WLAN access point will change with the remaining power capacity inside the energy storage battery 17. When the remaining power is less, the transmission time between two beacon frames The interval becomes longer.

In most places in China, the solar power generation system that does not track the sun in East China and South China can still have an average sunshine of four hours a day throughout the year at the best elevation angle. 3.6 hours of average sunshine. Therefore, after matching the appropriate photovoltaic cell 16 and energy storage battery 17 , the semi-working WLAN access point 1 can maintain continuous operation without power supply.

And because many places may not have users needing GPS information services at all during specific periods, the processor can be preset to work periods and preset non-working periods, cut off the power of the Wifi signal transmitting device 11 during non-working periods, and The processor 13 enters a sleep power-saving state to save power in the energy storage battery.

Further, the wireless positioning information system includes a memory device 18, which stores preset information, and the processor 13 will pre-set information when the semi-working wireless local area network access point sends a beacon frame broadcast signal. The information is placed in the SSID in the broadcast signal of the beacon frame and sent by the Wifi signal transmitting device 11 .

However, the present invention does not limit the user to use photovoltaic power generation, and the present invention can be realized even if a general dry battery or a rechargeable battery charged by commercial power is used.

In order to further properly utilize the power in the energy storage battery, when the power of the energy storage battery is still greater than or equal to 50% of the full capacity of the energy storage battery during the working period, the half-work WLAN access point 1 transmits every 100 milliseconds to 200 milliseconds For one SSID, when the power of the energy storage battery is less than 50% of the full capacity of the energy storage battery but greater than or equal to 10% of the battery capacity, the half-work wireless LAN access point 1 transmits an SSID every half second to 1 second. When the battery power is less than 10% of the full capacity of the energy storage battery, the half-work wireless LAN access point enters a sleep or shutdown power-saving state, and when the battery power is recharged to 50% or higher battery capacity, the half-work wireless LAN access point The entry point is restored to working condition.

Further, the coverage of the Wifi client 2 by the WLAN access point 1 is changed by adjusting the transmission power of the Wifi signal transmitting device 11, so as to adjust the positioning accuracy.

Further, the beacon frame broadcast signals of the half-duplex wireless local area network access point 1 all conform to the IEEE 802.11 protocol.

Further, a Wifi signal detection module 12 is arranged in the semi-working wireless LAN access point, and before transmitting the beacon frame broadcast signal, first detects whether there are transmission signals of other 802.11 devices, and if no other 802.11 devices are detected When the signal is transmitted, the SSID broadcast signal is sent again

The present invention utilizes the wireless local area network access point to broadcast the precise geographic location, and after the wireless local area network client without GPS function enters the signal coverage of the wireless local area network access point of the present invention, the precise positioning of the coverage area can be obtained from the SSID, thereby realizing Wireless roaming positioning; the present invention can also send the precise time of GPS in the SSID, so that the wireless local area network client can accurately synchronize the time, and the user can obtain position or time information by using a general-purpose WiFi handheld device or a notebook computer. Because solar energy is used for power supply, WiFi access points can provide accurate location, time and other information services without pulling power lines. The system is easy to install and cheap, and does not require special maintenance. It can rely on solar power to provide long-term location information. Serve.

The semi-working wireless LAN access point 1 is placed in an appropriate place. When the user walks nearby, the wireless LAN client 2 will receive the radio frequency signal, and the range of acceptance can be changed by adjusting the set transmission power. The higher the range, the greater the range, so when the battery power is low, the WiFi transmission power can be reduced, which can extend the service time and wait for the next opportunity for light energy charging.

Since changing the transmission power will affect the label service coverage, it is not the best way to reduce the transmission power when the battery is insufficient. Preferably, the time interval of the beacon frame broadcast signal of the half-work WLAN access point 1 is increased with the solar battery 13 The remaining internal power capacity changes, the less power remaining, the longer the interval, but the transmission power will not change with the remaining power of the battery.

The power planning of the solar battery is about to charge for one day to store energy for three days of normal full load power, so that it can be used to support the next two days under the condition of cloudy and rainy without the sun, and can maintain a certain amount of power to work normally, and the discharge light of the battery will be shortened. Battery life, but according to the above method, when half of the power is left, the launch interval will start to extend, so the subsequent power consumption will be lower than the normal full-load power consumption. If you don’t charge for three days, you can still leave a considerable amount of power , which results in longer battery life.

In order to reduce the impact of SSID broadcast on the wireless network, a WiFi signal detection module 12 is added in Embodiment 2. Before the Wifi signal transmitting device 11 sends an 802.11 beacon frame broadcast, the WiFi signal detection module 12 first detects whether there are other 802.11 The communication signal of the device waits until the communication signal of other communication devices is not detected before transmitting, which can reduce the probability of signal collision.

In the embodiment shown in Fig. 3, three half-work WLAN access points 101, 102 and 103 are included, and their respective coverage areas are 201, 202 and 203, and two WLAN clients 22 and 24, three and a half The physical positions of the wireless LAN access points 101, 102 and 103 are known, and the service software is installed in the two wireless LAN clients 22 and 24. The size of the signal coverage areas 201, 202 and 203, the higher the power, the greater the range.

In order to illustrate the different effects of different coverage plans, the coverage is small and non-overlapping: the client 24 has just entered or left the coverage 201 of the half-duty WLAN access point 101, and the client 24 will still use The GPS position received by the half-way WLAN access point 101 is used as positioning information. Similarly, the client 22 is within the coverage area 202 of the half-work WLAN access point 102, so the client 22 uses the GPS location received by the half-work WLAN access point 102 as the positioning information.

The embodiment shown in Figure 4 increases the coverage in the embodiment of Figure 3, and the coverage of the half-work WLAN access points 101, 102 and 103 is changed from 201, 202 and 203 to 301, 302 and 303, covering Ranges 301, 302, and 303 are interlaced in pairs, and the centers of 301, 302, and 303 are even more overlapping. The client 24 in the same position as in FIG. 3 in FIG. After receiving the GPS position signals among the three SSIDs, the software of the client 24 can judge that the position is in the middle of the three GPS position information; similarly, the client 22 is at the junction of the ranges 302 and 303, and the client 24 22 can receive the SSID signals of the half-way WLAN access points 102 and 13, so the software of the client 22 can judge that the location is in the middle of the two GPS location information.

Because there are several sets of information to be transmitted externally, the processor 13 may send location, time and other service information in turn in the manner of interleaved information broadcasting.

The above examples are illustrative only and not limiting. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the claims of the present application.

Claims (10)

1. A wireless positioning information system, comprising at least one half-work wireless local area network access point, is characterized in that: any one described half-work wireless local area network access point all respectively comprises a Wifi signal transmitter, a GPS receiving module and A processor, described processor is connected with described GPS receiving module, and processor is connected with described Wifi signal transmitting device again, utilizes GPS receiving module to receive the positioning information or time information of GPS satellite, and processor receives from GPS The module receives positioning information or time information and adds the positioning information or time information to the SSID in the beacon frame broadcast signal, and uses the Wifi signal transmitter to transmit the beacon frame broadcast signal. 2. The wireless positioning information system as claimed in claim 1, characterized in that: said semi-work wireless local area network access point comprises a photovoltaic cell, and the current output terminal of said photovoltaic cell is connected with Wifi signal transmitting device and GPS receiver. Module and processor connection. 3. The wireless location information system as claimed in claim 2, characterized in that: said semi-working wireless local area network access point comprises an energy storage battery, and said energy storage battery is connected to the current output terminal of the photovoltaic cell through a charging circuit connected, using energy storage batteries to store electrical energy from photovoltaic cells. 4. The wireless location information system as claimed in claim 3, characterized in that: said half-work WLAN access point comprises a power management circuit, said power management circuit is connected with processor and energy storage battery, utilizes The processor monitors the remaining power of the energy storage battery through the power management circuit, and uses the processor to adjust the signal transmission power of the Wifi signal transmitting device or the transmission time interval of two adjacent beacon frame broadcast signals according to the remaining power of the energy storage battery. 5. The wireless positioning information system as claimed in claim 3, characterized in that: said semi-working wireless local area network access point includes a memory device, said memory device is connected to a processor, and utilizes the memory device to store preset information , using the processor to add the preset information to the SSID in the broadcast signal of the beacon frame and transmit it through the Wifi signal transmitting device. 6. The wireless location information system as claimed in claim 1, characterized in that: the receiving range of the wireless local area network client is changed by adjusting the transmitting power of the Wifi signal transmitting device, and the receiving range of the wireless local area network client is adjusted by controlling the receiving range of the wireless local area network client positioning accuracy. 7. The wireless positioning information system as claimed in claim 3, characterized in that: a working period is preset in the processor, and at a time other than the described working period, the processor is used to cut off the power supply of the Wifi signal transmitting device, and make the The processor itself enters a sleep power-saving state. 8. The wireless positioning information system according to claim 7, characterized in that: in the working period, the processor is used to detect the remaining electric energy of the energy storage battery through the power management circuit, and the remaining electric energy of the energy storage battery is greater than or When it is equal to 50% of its full capacity, use the processor to control the Wifi signal transmitting device to transmit an SSID every 100-200 milliseconds, when the remaining power of the energy storage battery is less than 50% of its full capacity and greater than or equal to its full capacity 10%, use the processor to control the Wifi signal transmitting device to transmit an SSID every half second to 1 second, when the remaining power of the energy storage battery is less than 10% of its full capacity, use the processor to cut off the power supply of the Wifi signal transmitting device, And make the processor itself enter the sleep power saving state. 9. The wireless positioning information system as claimed in claim 1, characterized in that: the beacon frame broadcast signal of the semi-working wireless local area network access point conforms to the IEEE 802.11 protocol. 10. The wireless positioning information system as claimed in claim 1, characterized in that: a Wifi signal detection module is arranged in the said half-work WLAN access point, and said Wifi signal detection module is connected with the processor , use the Wifi signal detection module to detect whether there are other 802.11 device transmission signals around before transmitting the beacon frame broadcast signal, and then send the SSID broadcast signal when no other 802.11 device transmission signals are detected.

Images