CN103647592B - A kind of signal acceptance method and equipment - Google Patents

Abstract

The present application provides a signal sending method, a receiving method and a device. The signal sending method includes: generating a carrier signal with a frequency of medium and low frequency; encapsulating the data to be sent in the sending device into a message; encoding the data in the message to obtain an encoded code stream; The stream is modulated onto the carrier signal to obtain at least one code stream signal, wherein the frequency of the code stream signal is the same as that of the carrier signal; at least one code stream signal is amplified to obtain at least one RFID signal; Inside, the sending of the RFID signal is controlled according to the control signal. Since the RFID signal is a medium and low frequency, when the medium and low frequency RFID signal passes through obstacles indoors, its stability is better than that of the UHF and microwave RFID signals, and then the positioning accuracy of the medium and low frequency RFID signal is higher than that of using UHF and microwave RFID signals for positioning.

Description

A signal receiving method and device

technical field

The present application relates to the technical field of RFID (Radio Frequency IDentification, radio frequency identification), in particular to a signal sending method, a signal receiving method and a device.

Background technique

RFID technology is a communication technology that identifies electronic tags and reads and writes relevant data through radio signals without establishing mechanical or optical contact between the identification system and the electronic tag. Due to the non-contact and non-line-of-sight advantages of RFID technology, RFID technology has become the preferred indoor positioning technology.

At present, indoor positioning using RFID technology mainly uses RSSI (Received Signal Strength Indication, received signal strength indication) ranging. The RSSI value in the signal is converted into distance information, and finally the position of the electronic tag is calculated by using the three-point positioning principle. After obtaining the position information of the electronic tag, the movement trajectory of the electronic tag in a certain area can be calculated, so as to achieve real-time positioning and tracking of the electronic tag.

From the above processing process, it can be concluded that the accuracy of distance measurement is very important to the accuracy of the entire processing process. At present, RFID technology mainly uses four frequency bands for positioning: medium and low frequency (125KHz (kiloHertz, kilohertz) ~ 225KHz), high frequency (13.56MHz (Mega Hertz, megahertz)), ultra-high frequency (433/868/915MHz ) and microwave (2.4/5.8GHz (GigaHertz, gigahertz)), where UHF and microwave are mainly used in indoor positioning.

When the RFID signal is transmitted indoors through obstacles, the signal power will be attenuated due to the scattering of the obstacles to the RFID signal, resulting in a large difference in RSSI between the RFID signal indoors and the open outdoors, and even in complex indoors, the shadow effect Capable of blocking RFID signal propagation. Due to the high frequency and short signal wavelength of UHF and microwave, the scattering phenomenon of RFID signal is serious during the propagation process, which leads to the enhancement of multipath path effect and increases the attenuation of RFID signal when propagating in complex indoor environment. It cannot be precisely positioned in an indoor environment.

Contents of the invention

The technical problem to be solved in this application is to provide a signal sending method, a signal receiving method and equipment to solve the problem in the prior art that UHF and microwave RFID signals cannot be accurately positioned in an indoor environment. The technical scheme is as follows:

An embodiment of the present application provides a signal sending method, including:

generating a carrier signal with a frequency of low-medium frequency ranging from 125 kHz to 225 kHz;

Encapsulating the data to be sent in the sending device into a message, wherein the sending device is used to send a radio frequency identification signal, and the radio frequency identification signal is used to trigger the electronic tag to enter the working state;

Encoding the data in the message to obtain an encoded code stream;

Modulating the coded code stream onto the carrier signal whose frequency is a medium-low frequency to obtain at least one code stream signal, wherein the frequency of the code stream signal is the same as that of the carrier signal;

amplifying the at least one code stream signal to obtain at least one radio frequency identification signal;

In the sending time slot of the sending device itself, the sending of the radio frequency identification signal is controlled according to the control signal.

Preferably, the frequency of the carrier signal is 125 kHz.

Preferably, the encoded code stream is modulated onto the carrier signal with a medium-low frequency to obtain at least one code stream signal, which includes: using binary on-off keying modulation, loading the coded code stream to the On the above carrier signal, a code stream signal is obtained.

Preferably, encoding the data in the message to obtain an encoded code stream includes: performing Manchester encoding on the data in the message to obtain a code stream.

Preferably, before generating a carrier signal with a medium-low frequency, the method further includes: determining a sending time slot of the sending device, wherein the length of the sending time slot is 40 milliseconds.

The embodiment of the present application also provides a signal receiving method, including:

Using a three-axis antenna to receive radio frequency identification signals;

Acquiring a received signal strength indicator value of the radio frequency identification signal;

When it is determined that the carrier signal corresponding to the radio frequency identification signal has the same frequency as the carrier signal generated by the sending device, and the synchronization word in the radio frequency identification signal is the same as the synchronization word of the sending device, the radio frequency identification signal The data stream after the synchronization word is decoded to obtain the decoded data;

sending the received signal strength indicator value and the decoded data.

Preferably, obtaining the received signal strength indicator value of the radio frequency identification signal includes:

performing automatic gain control on the radio frequency identification signals received by the three channels of the triaxial antenna to obtain three radio frequency identification signals after automatic gain control;

Selecting a radio frequency identification signal with the best signal strength from the three radio frequency identification signals for buffering;

When buffering at least six radio frequency identification signals, select six radio frequency identification signals with the best signal strength from the at least six radio frequency identification signals, and use the signal strength of each radio frequency identification signal as the corresponding radio frequency identification signal Received signal strength indicator value;

When the six radio frequency identification signals are not buffered, all the buffered radio frequency identification signals are selected, and the signal strength of each radio frequency identification signal is used as the received signal strength indication value of the corresponding radio frequency identification signal.

Preferably, the data stream after the synchronization word in the radio frequency identification signal is decoded to obtain decoded data, including:

Manchester decoding is performed on the data stream following the synchronization word in the radio frequency identification signal to obtain decoded data.

The embodiment of the present application further provides a signal sending device, including:

The single-chip microcomputer is used to generate a carrier signal with a frequency of medium and low frequency, encapsulate the data that needs to be sent in the signal sending device into a message, encode the data in the message, obtain an encoded code stream, and convert the encoded code stream into a message. The code stream is modulated onto the carrier signal of the medium and low frequency to obtain at least one code stream signal, wherein the range of the medium and low frequency is 125 kHz to 225 kHz, and the signal sending device is used to send radio frequency identification signals , the radio frequency identification signal is used to trigger the electronic tag to enter the working state signal, and the frequency of the code stream signal is the same as the frequency of the carrier signal;

an amplifying circuit, configured to amplify the at least one code stream signal to obtain at least one radio frequency identification signal;

The sending antenna is used to control the sending of the radio frequency identification signal according to the control signal in the sending time slot of the sending device itself.

The embodiment of the present application further provides a signal receiving device, including:

a triaxial antenna for receiving radio frequency identification signals;

a single-chip microcomputer, used to obtain the received signal strength indicator value of the radio frequency identification signal, and used to determine that the frequency of the carrier signal corresponding to the radio frequency identification signal is the same as that of the carrier signal generated by the sending device, and the radio frequency identification When the synchronization word in the signal is the same as the synchronization word of the sending device, the data stream after the synchronization word in the radio frequency identification signal is decoded to obtain decoded data;

a sending antenna, configured to send the received signal strength indicator value and the decoded data.

Compared with the prior art, the present application includes the following advantages:

The signal transmission method provided by the embodiment of the present application will first generate a carrier signal with a frequency of medium and low frequency, and obtain an RFID signal on the basis of the medium and low frequency carrier signal, and the RFID signal is obtained by amplifying the code stream signal with the same frequency as the carrier signal , so the frequency of the RFID signal is still low frequency. Since the mid-low frequency RFID signal has a longer wavelength, it can fully suppress the scattering effect, and when encountering obstacles, it can pass through obstacles through the diffraction effect, so when the mid-low frequency RFID signal passes through obstacles indoors, its stability is excellent. Based on UHF and microwave RFID signals, and then using the mid-low frequency RFID signals for positioning is more accurate than using UHF and microwave RFID signals for positioning.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flow chart of a signal sending method provided by an embodiment of the present application;

FIG. 2 is a flow chart of a signal receiving method provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a signal sending device provided in an embodiment of the present application;

Fig. 4 is a schematic structural diagram of a signal receiving device provided by an embodiment of the present application.

detailed description

First, a brief description is given of a signal sending method and a receiving method provided in the embodiment of the present application. A signal sending method provided in the embodiment of the present application may include:

generating a carrier signal with a frequency of low-medium frequency ranging from 125 kHz to 225 kHz;

Encapsulating the data to be sent in the sending device into a message, wherein the sending device is used to send a radio frequency identification signal, and the radio frequency identification signal is used to trigger the electronic tag to enter the working state;

Encoding the data in the message to obtain an encoded code stream;

Modulating the coded code stream onto the carrier signal whose frequency is a medium-low frequency to obtain at least one code stream signal, wherein the frequency of the code stream signal is the same as that of the carrier signal;

amplifying the at least one code stream signal to obtain at least one radio frequency identification signal;

In the sending time slot of the sending device itself, the sending of the radio frequency identification signal is controlled according to the control signal.

Correspondingly, a signal receiving method provided in the embodiment of the present application includes:

Using a three-axis antenna to receive radio frequency identification signals;

Acquiring a received signal strength indicator value of the radio frequency identification signal;

When it is determined that the carrier signal corresponding to the radio frequency identification signal has the same frequency as the carrier signal generated by the sending device, and the synchronization word in the radio frequency identification signal is the same as the synchronization word of the sending device, the radio frequency identification signal The data stream after the synchronization word is decoded to obtain the decoded data;

sending the received signal strength indicator value and the decoded data.

In the above signal sending method, an RFID signal is obtained on the basis of a medium-low frequency carrier signal, and the RFID signal is obtained by amplifying a code stream signal having the same frequency as the carrier signal, so the frequency of the RFID signal is still a medium-low frequency. Since the mid-low frequency RFID signal has a longer wavelength, it can fully suppress the scattering effect, and when encountering obstacles, it can pass through obstacles through the diffraction effect, so when the mid-low frequency RFID signal passes through obstacles indoors, its stability is excellent. Based on UHF and microwave RFID signals, and then using the mid-low frequency RFID signals for positioning is more accurate than using UHF and microwave RFID signals for positioning.

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Please refer to FIG. 1, which shows a flowchart of a signal sending method provided by an embodiment of the present application, which may include the following steps:

Step 101: Generate a carrier signal with a medium-low frequency.

In the embodiment of the present application, the middle and low frequencies range from 125KHz to 225KHz. Since the wavelength of the 125KHz carrier signal is greater than that of other carrier signals in the low-to-medium frequency range, and correspondingly, its stability in passing through obstacles is better than that of other carrier signals in the low-to-medium frequency range, so the carrier signal with a frequency of 125KHz is preferred in this embodiment of the application.

Step 102: Encapsulate the data to be sent in the sending device into a message, wherein the sending device is used to send an RFID signal, and the RFID signal is used to trigger the electronic tag to enter the working state.

Since the RFID signal is used to trigger the electronic tag to enter the working state, and the electronic tag needs to know which sending device sent the RFID signal, the data that the sending device needs to send may include a sign that identifies the sending device. Because each device has a unique identification number, the unique identification number of the device can be used for identification in this embodiment of the application. The corresponding RFID signal includes the identification number of the sending device.

Further, the data that the sending device needs to send may also include a CRC (Cyclic Redundancy Check) code, which is obtained by calculating the identification number of the device, so as to avoid the Wrong label.

When encapsulating data, it can be encapsulated according to the existing protocol format, and the format of the message obtained after encapsulation can be: preamble + synchronization word + identification number + check code. The preamble part is the beginning of the message, which may include information such as the message header, and the synchronization word is used to avoid interference from other signals, and the receiving device only decodes the data after the synchronization word after receiving a valid synchronization word. Certainly, the message obtained after encapsulating the data in the embodiment of the present application may also be in other formats, which will not be introduced one by one in the embodiment of the present application.

Step 103: Encode the data in the message to obtain an encoded code stream.

When encoding the data in the message, the existing encoding technology can be used, preferably using Manchester encoding to obtain a code stream of 01010100001111..., that is, a sequence of 0/1. The reason why Manchester is chosen for encoding is: encoding with Manchester can encode the clock signal into the code stream, which is convenient for the receiving device to recover the clock signal directly from the code stream; on the other hand, after encoding, the code stream can be transmitted The spectrum is further equalized to improve the efficiency of the spectrum. The clock signal is used to adjust the clocks of the sending device and the receiving device, and synchronize the clock references between the sending device and the receiving device.

On the premise that the clock reference is synchronized, different sending time slots are further assigned to different sending devices, so that each sending device can send RFID signals in its own sending time slots to avoid interference between RFID signals.

Furthermore, each sending device actually covers a space sphere with a certain distance as the radius, and the entire indoor space is composed of several space spheres. If multiple sending devices send RFID signals at the same time, the distance between multiple RFID signals The RFID signal is destroyed by the collision between them, and the transmission is invalid. Therefore, on the premise that the clock reference is synchronized, different sending time slots are assigned to different sending devices, so that each sending device can send RFID in its own sending time slot. Signals to ensure that there will be no collision between RFID signals. In the embodiment of the present invention, the length of the sending time slot of each sending device is 40 ms, and this value can meet the requirement of sending time allocation among sending devices.

Step 104: Modulate the coded code stream onto a carrier signal with a medium-low frequency to obtain at least one code stream signal, wherein the frequency of the code stream signal is the same as that of the carrier signal.

In the embodiment of this application, the existing relatively mature modulation technology can be used to modulate the code stream, such as FSK (Frequency-Shift Keying, frequency shift keying) modulation method or OOK OOK (On-Off Keying, binary on-off keying) modulation method. When the modulation mode of OOK is adopted, one code stream signal can be obtained; when the modulation mode of FSK is adopted, at least two code stream signals of different frequency points will be generated.

Since the receiving device corresponding to the sending device is generally carried around, it is required to be small in size and its lifespan is required to be at least two years when it is powered by a battery, so the receiving device needs to have the characteristics of small size and low power consumption, which means that the receiving device is The signal processing time should be shortened.

Since the transmission time of the code stream signal obtained by FSK and other modulation methods is longer than the transmission time of the code stream signal obtained by OOK modulation, and when the receiving device uses FSK and other methods to demodulate, its power consumption is greater than that of OOK demodulation, so The receiving device consumes less power when receiving the code stream signal obtained through OOK modulation, and the embodiment of the present application preferably adopts the OOK modulation mode to obtain a code stream signal.

Step 105: Amplify at least one code stream signal to obtain at least one RFID signal.

When amplifying the code stream signal, two-stage amplification can be used, that is, the code stream signal is amplified through a first-stage push-pull power amplifier circuit and a second-stage push-pull power amplifier circuit to increase the amplification power of the RFID signal.

Step 106: In the sending time slot of the sending device itself, control the sending of the RFID signal according to the control signal.

In the embodiment of the present invention, the control signal is a square wave sequence with a baud rate of 4096. Under this square wave sequence, when the square wave sequence is at a high level, the RFID signal is output; when the square wave sequence is at a low level, the RFID signal Disable output.

Among them, the control signal can be directly generated by a signal generator, of course, it can also be generated by other methods, for example, by a secondary control method, the method is as follows:

First, perform Manchester encoding on the data in the message. After encoding, a 01010100001111..., that is, a sequence of 0/1 will be generated. At the same time, the sending device will generate a square wave signal with a frequency of 4096. Secondly, the encoded sequence and The AND operation of the square wave signal can generate a square wave sequence with a baud rate of 4096, and use this square wave sequence as a control signal.

Applying the above-mentioned technical solution, an RFID signal is obtained on the basis of a medium-low frequency carrier signal, and the RFID signal is obtained by amplifying a code stream signal having the same frequency as the carrier signal, so the frequency of the RFID signal is still a medium-low frequency. Since the mid-low frequency RFID signal has a longer wavelength, it can fully suppress the scattering effect, and when encountering obstacles, it can pass through obstacles through the diffraction effect, so when the mid-low frequency RFID signal passes through obstacles indoors, its stability is excellent. Based on UHF and microwave RFID signals, and then using the mid-low frequency RFID signals for positioning is more accurate than using UHF and microwave RFID signals for positioning.

Correspondingly, the embodiment of the present application also provides a signal receiving method, which can be applied to receiving devices such as electronic tags, and its flow chart can be referred to as shown in Figure 2, which can include the following steps:

Step 201: Using a three-axis antenna to receive RFID signals.

The three-axis antenna is an xyz three-channel three-dimensional receiving antenna, each channel can receive RFID signals, so that the field strength in each direction can be kept constant, so as to ensure the maximum restoration of the point field strength of the receiving device and solve the problem of signal receiving Directional issues in the process.

Step 202: Obtain the RSSI value of the RFID signal.

After receiving the RFID signal, the RSSI value of the RFID signal can be obtained directly, of course, the RFID signal can also be obtained after processing, as follows:

After the three-axis antenna receives an RFID signal, it performs automatic gain control on the RFID signal in each channel, selects an RFID signal with the best signal strength from the three RFID signals after automatic gain control, and caches it in the buffer middle.

Further in the actual scene, there are at least six sending devices installed within the RFID signal coverage area, and different sending devices send RFID signals in different time slots, so the receiving device can receive at least six sending devices in turn using a three-axis antenna. RFID signal. After gain processing is performed on each received RFID signal, at least six RFID signals can be buffered in the buffer.

When buffering at least six RFID signals, select six RFID signals with optimal signal strength from at least six RFID signals, and use the signal strength of each RFID signal as the RSSI value of the corresponding RFID signal; when not buffering six RFID signals , select all the RFID signals in the cache, and use the signal strength of each RFID signal as the RSSI value of the corresponding RFID signal.

Step 203: When it is determined that the frequency of the carrier signal corresponding to the RFID signal is the same as that of the carrier signal generated by the sending device, and the synchronization word in the RFID signal is the same as that of the sending device, decode the data stream after the synchronization word in the RFID signal , to get the decoded data.

The sending device preferably uses Manchester for encoding, and correspondingly the receiving device uses Manchester for decoding.

Step 204: Send the RSSI value and the decoded data.

After receiving the RSSI value and the decoded data, the receiving device sends it to the background server, and the background server locates the receiving device, such as an electronic tag, according to the RSSI value and the decoded data. The specific process can be as follows:

The decoded data includes not only the identification number of the sending device, but also the identification number of the receiving device. Further, the background server can obtain the RSSI value corresponding to the identification number of the same receiving device, and then convert the RSSI value into distance information. Finally, use three points The positioning principle calculates the position of the receiving device.

Of course, the process of the background server locating the receiving device can also be completed by the receiving device itself, which is not limited in this embodiment of the present application.

Since the sending device sends a mid-low frequency RFID signal, the stability of the mid-low frequency RFID signal is better than that of UHF and microwave RFID signals when it passes through obstacles indoors, so the RFID signal received by the receiving device The stability is greater than that of UHF and microwave RFID signals. When using this RFID signal for positioning, its accuracy is improved, which solves the problem of low accuracy when using high frequency and microwave RFID signals for positioning.

The RFID signal obtained by the signal transmission method provided by the embodiment of the present invention has passed the signal transmission test, and its farthest transmission can reach 12M, and the receiving device can process about 1000 RFID signals in an indoor space, which is far greater than Currently on the market for the processing of 100 RFID signals.

Compared with the signal sending method shown in FIG. 1 , the embodiment of the present application also provides a signal sending device, whose structure diagram is shown in FIG. in,

The single-chip microcomputer 11 is used to generate a carrier signal with a frequency of medium and low frequency, encapsulate the data that needs to be sent in the signal sending device into a message, encode the data in the message, obtain the encoded code stream, and convert the encoded code into a message. The stream is modulated onto a carrier signal with a medium-low frequency to obtain at least one code stream signal.

Among them, the medium and low frequency range is from 125KHz to 225KHz. Since the wavelength of the 125KHz carrier signal is greater than that of other carrier signals in the medium and low frequency range, the corresponding stability of its crossing obstacles is better than that of other carrier signals in the medium and low frequency range. The preferred embodiment of the application is a carrier signal with a frequency of 125KHz.

The data that the signal sending device needs to send includes: the identification number of the device and the CRC code, where the identification number of the device is used to identify which RFID signal sending device sent the signal, and the CRC code can verify whether the identification number of the device has been changed to avoid positioning The electronic label is wrong. Among them, the RFID signal is used to trigger the electronic tag to enter the working state signal.

When encapsulating data, it can be encapsulated according to the existing protocol format, and the format of the message obtained after encapsulation can be: preamble + synchronization word + identification number + check code. The preamble part is the beginning of the message, which can include message header and other information. The synchronization word is used to avoid interference from other signals, and the receiving device only decodes the data after the synchronization word after receiving a valid synchronization word. Certainly, the message obtained after encapsulating the data in the embodiment of the present application may also be in other formats, which will not be introduced one by one in the embodiment of the present application.

Further, when encoding the data in the message, an existing encoding technology may be used, preferably Manchester encoding.

In the embodiment of the present application, existing relatively mature modulation techniques may be used for modulating the code stream, such as an FSK modulation manner or an OOK modulation manner. When the modulation mode of OOK is adopted, one code stream signal can be obtained; when the modulation mode of FSK is adopted, at least two code stream signals of different frequency points will be generated.

Since the receiving device corresponding to the sending device is generally carried around, it is required to be small in size and its lifespan is required to be at least two years when it is powered by a battery, so the receiving device needs to have the characteristics of small size and low power consumption, which means that the receiving device is The signal processing time should be shortened.

Since the transmission time of the code stream signal obtained by FSK and other modulation methods is longer than the transmission time of the code stream signal obtained by OOK modulation, and when the receiving device uses FSK and other methods to demodulate, its power consumption is greater than that of OOK demodulation, so When the receiving device receives the code stream signal obtained by OOK modulation, its power consumption is small, and the embodiment of the present application preferably adopts the OOK modulation method to obtain a code stream signal, and the frequency of the code stream signal is the same as that of the carrier signal.

The amplifying circuit 12 is configured to amplify at least one code stream signal to obtain at least one RFID signal. The amplifying circuit 12 can adopt two-stage amplification, that is, the code stream signal is amplified sequentially through a primary push-pull power amplifier circuit and a secondary push-pull power amplifier circuit to increase the amplification power of the RFID signal.

The sending antenna 13 is used to control the sending of the RFID signal according to the control signal in the sending time slot of the sending device itself.

Wherein, the sending device firstly adjusts the clock according to the clock signal, and synchronizes the clock reference between the sending device and the receiving device. On the premise that the clock reference is synchronized, different sending time slots are further assigned to different sending devices, so that each sending device can send RFID signals in its own sending time slots to avoid interference between RFID signals.

In the embodiment of the present invention, the control signal is a square wave sequence with a baud rate of 4096. Under this square wave sequence, when the square wave sequence is at a high level, the RFID signal is output; when the square wave sequence is at a low level, the RFID signal Disable output.

Among them, the control signal can be directly generated by a signal generator, of course, it can also be generated by other methods, for example, by a secondary control method, the method is as follows:

First, perform Manchester encoding on the data in the message. After encoding, a 01010100001111..., that is, a sequence of 0/1 will be generated. At the same time, the sending device will generate a square wave signal with a frequency of 4096. Secondly, the encoded sequence and The AND operation of the square wave signal can generate a square wave sequence with a baud rate of 4096, and use this square wave sequence as a control signal.

Corresponding to the signal receiving method shown in FIG. 2 , the embodiment of the present application also provides a signal receiving device, whose structure diagram is shown in FIG. in,

The triaxial antenna 21 is used for receiving RFID signals. The three-axis antenna is an xyz three-channel three-dimensional receiving antenna, and each channel can receive RFID signals, so that the field strength in each direction can be kept constant, and the point field strength of the receiving device can be restored to the maximum extent.

The single-chip microcomputer 22 is used to obtain the RSSI value of the RFID signal, and is used to determine that the carrier signal corresponding to the RFID signal has the same frequency as the carrier signal generated by the sending device, and the synchronization word in the RFID signal is the same as the synchronization word of the sending device, The data stream after the synchronization word in the RFID signal is decoded to obtain the decoded data.

The process of obtaining the RSSI value by the single-chip microcomputer 22 may be: performing automatic gain control on the RFID signals received by the three channels of the triaxial antenna, obtaining three RFID signals after automatic gain control, and selecting a signal strength from these three RFID signals The optimal RFID signal is cached; when at least six RFID signals are cached, six RFID signals with optimal signal strength are selected from at least six RFID signals, and the signal strength of each RFID signal is used as the RSSI value of the corresponding RFID signal ; When the six RFID signals are not cached, select all the cached RFID signals, and use the signal strength of each RFID signal as the RSSI value of the corresponding RFID signal.

The signal sending device preferably uses Manchester for encoding, and the corresponding signal receiving device uses Manchester for decoding when decoding.

The sending antenna 23 is used for sending the received signal strength indicator value and the decoded data. After the signal receiving device obtains the RSSI value and the decoded data, it is sent to the background server by the transmitting antenna 23, and the signal receiving device, such as an electronic tag, is positioned by the background server according to the RSSI value and the decoded data. For the location of the background server For the process, please refer to the method embodiment shown in FIG. 2 .

Of course, the positioning of the signal receiving device can also be completed by the single-chip microcomputer 22 therein, and this embodiment of the present application does not limit the specific operating device for positioning.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device-type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to part of the description of the method embodiments.

Finally, it should also be noted that in this document, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements not only includes those elements, but also other elements not expressly listed, or elements inherent in the process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present application, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

A signal sending method, a signal receiving method and equipment provided by this application have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of this application. The description of the above embodiments is only for helping understanding The method of this application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not understood as a limitation on the application.

Claims (3)

1. A signal receiving method, comprising:

receiving a radio frequency identification signal by using a three-axis antenna;

acquiring a received signal strength indicating value of the radio frequency identification signal;

when it is determined that the frequency of a carrier signal corresponding to the radio frequency identification signal is the same as the frequency of a carrier signal generated by a sending device, and a synchronization word in the radio frequency identification signal is the same as the synchronization word of the sending device, decoding a data stream after the synchronization word in the radio frequency identification signal to obtain decoded data;

transmitting the received signal strength indication value and the decoded data;

obtaining a received signal strength indicator value of the radio frequency identification signal, comprising:

performing automatic gain control on the radio frequency identification signals received by the three channels of the triaxial antenna to obtain three radio frequency identification signals after automatic gain control;

selecting a radio frequency identification signal with the optimal signal intensity from the three radio frequency identification signals for caching;

when at least six radio frequency identification signals are cached, selecting six radio frequency identification signals with the optimal signal intensity from the at least six radio frequency identification signals, and taking the signal intensity of each radio frequency identification signal as a received signal intensity indicated value of the corresponding radio frequency identification signal;

when the six radio frequency identification signals are not cached, all the cached radio frequency identification signals are selected, and the signal intensity of each radio frequency identification signal is used as a received signal intensity indicated value of the corresponding radio frequency identification signal.

2. The method of claim 1, wherein decoding the data stream following the sync word in the radio frequency identification signal to obtain decoded data comprises:

and performing Manchester decoding on the data stream after the synchronous word in the radio frequency identification signal to obtain decoded data.

3. A signal receiving apparatus, comprising:

a triaxial antenna for receiving a radio frequency identification signal;

the single chip microcomputer is used for acquiring a received signal strength indicating value of the radio frequency identification signal, and decoding a data stream after a synchronous word in the radio frequency identification signal to obtain decoded data when it is determined that a carrier signal corresponding to the radio frequency identification signal is the same as the frequency of a carrier signal generated by sending equipment and the synchronous word in the radio frequency identification signal is the same as the synchronous word in the sending equipment;

a transmitting antenna for transmitting the received signal strength indication value and the decoded data;

obtaining a received signal strength indicator value of the radio frequency identification signal, comprising:

performing automatic gain control on the radio frequency identification signals received by the three channels of the triaxial antenna to obtain three radio frequency identification signals after automatic gain control;

selecting a radio frequency identification signal with the optimal signal intensity from the three radio frequency identification signals for caching;

when at least six radio frequency identification signals are cached, selecting six radio frequency identification signals with the optimal signal intensity from the at least six radio frequency identification signals, and taking the signal intensity of each radio frequency identification signal as a received signal intensity indicated value of the corresponding radio frequency identification signal;

when the six radio frequency identification signals are not cached, all the cached radio frequency identification signals are selected, and the signal intensity of each radio frequency identification signal is used as a received signal intensity indicated value of the corresponding radio frequency identification signal.