阅读说明：本技术 一种信号接收灵敏度检测系统和方法 (Signal receiving sensitivity detection system and method ) 是由 林磊 刘洋 何义生 夏栩 于 2018-08-07 设计创作，主要内容包括：本发明公开了一种信号接收灵敏度检测系统和方法，一种用于汽车电子标识读写器的灵敏度检测装置，用以解决检测读写器在工作状态下的接收灵敏度问题。所述信号接收灵敏度检测系统，包括读写器和第一环形器和监测装置，第一环形器的第一端口与读写器连接；第一环形器的第三端口在接收到测试信号后通过第一端口发送给读写器；监测装置，用于在调整测试信号强度的过程中，监测测试信号的接收差错性能信息；以及确定所述接收差错性能信息小于预设阈值时对应的测试信号强度为读写器的接收灵敏度。(The invention discloses a system and a method for detecting signal receiving sensitivity, in particular to a sensitivity detection device for an automobile electronic identification reader-writer, which is used for solving the problem of detecting the receiving sensitivity of the reader-writer in a working state. The signal receiving sensitivity detection system comprises a reader-writer, a first circulator and a monitoring device, wherein a first port of the first circulator is connected with the reader-writer; the third port of the first circulator sends the test signal to the reader-writer through the first port after receiving the test signal; the monitoring device is used for monitoring the receiving error performance information of the test signal in the process of adjusting the strength of the test signal; and determining the corresponding test signal strength as the receiving sensitivity of the reader-writer when the receiving error performance information is smaller than a preset threshold value.)

1. A signal reception sensitivity detection system is characterized by comprising a reader-writer, a first circulator and a monitoring device, wherein:

a first port of the first circulator is connected with the reader-writer; after receiving a test signal, the third port of the first circulator sends the test signal to the reader-writer through the first port;

the monitoring device is used for monitoring the receiving error performance information of the test signal in the process of adjusting the strength of the test signal; and determining the corresponding test signal strength as the receiving sensitivity of the reader-writer when the receiving error performance information is smaller than a preset threshold value.

2. The system of claim 1, wherein the third port of the first circulator is coupled to a signal source, and wherein the test signal comprises a modulated wave transmitted by the signal source in a tag-encoded manner; the second port of the first circulator is connected to a load.

3. The system of claim 2, wherein the reception error performance information includes a reception error rate.

4. The system of claim 1, wherein the test signal comprises a tag echo signal; and the system further comprises a transmit chain and a receive chain, wherein:

the transmitting link comprises a first digital attenuator which is respectively connected with the second port of the first circulator and the first port of the second circulator; the second port of the second circulator is connected with an antenna, and the antenna is communicated with the tag through a wireless link;

the receiving link comprises a carrier wave elimination system, a second digital attenuator and a label signal detection system, wherein the carrier wave elimination system is respectively connected with a third port of a second circulator and one end of the second digital attenuator, the other end of the second digital attenuator is connected with one end of the label signal detection system, and the other end of the label signal detection system is connected with a third port of the first circulator.

5. The system of claim 4,

the transmitting link is used for receiving radio frequency signals sent by the reader through a first port and a second port of the first circulator; and transmitting the received radio frequency signal to the tag through the first and second ports of the second circulator and the antenna;

the receiving link is used for receiving a reflected signal of the radio frequency signal and a tag echo signal sent by the tag through the antenna and a third port of the second circulator; and eliminating the transmitting signal and adjusting the strength of the tag echo signal.

6. The system of claim 5, wherein the transmitted signal is canceled by the carrier cancellation system; and adjusting the strength of the tag echo signal by using the second digital attenuator.

7. The system of claims 4, 5, wherein the reception error performance information includes a reception packet error rate.

8. A signal reception sensitivity detection method, characterized by being applied to the system of claim 3;

the method comprises the following steps:

the first port of the first circulator receives a modulated wave sent by the third port of the first circulator, and the modulated wave is sent to the third port of the first circulator by a signal source;

a first port of the first circulator transmits the modulated wave to the reader;

in the process of adjusting the transmitting power of the modulated wave, the monitoring device monitors the receiving error rate of the modulated wave;

and the monitoring device determines that the corresponding modulated wave transmitting power is the receiving sensitivity of the reader-writer when the receiving error rate is smaller than a preset threshold value.

9. A signal reception sensitivity detection method, characterized by being applied to the system of claim 6;

the method comprises the following steps:

the first port of the first circulator receives a tag echo signal sent by the third port of the first circulator;

a first port of the first circulator sends the tag echo signal to the reader;

in the process of adjusting the strength of the tag echo signal, the monitoring device monitors the receiving packet error rate of the tag echo signal;

and the monitoring device determines that the corresponding label echo signal intensity is the receiving sensitivity of the reader-writer when the receiving packet error rate is smaller than a preset threshold value.

10. The method of claim 9, wherein the tag echo signal is obtained by the receive chain by removing the reflected signal from the tag echo signal and the reflected signal received by the receive chain from the third port of the second circulator, and wherein the third port of the second circulator receives the tag echo signal and the reflected signal through the second port of the second circulator and an antenna.

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a system and a method for detecting signal reception sensitivity.

Background

Automobile electronic identification is based on the extension of passive Radio Frequency Identification (RFID) of thing networking in the wisdom traffic field. The automobile electronic identification system mainly comprises: a reader, a reader antenna, an electronic tag, and the like; the electronic tag used for storing the identity data of the automobile is arranged on the inner side of the front windshield of the automobile and is communicated with the high-speed reader-writer of the electronic license plate arranged on the section of the urban road, so that the data in the electronic tag can be read and written, and the identification and monitoring of the automobile can be automatically completed without contact or stop.

The reader-writer is an important device in an automobile electronic identification system and is in real-time communication with the electronic tag. The radio frequency performance of the reader-writer can directly influence the communication distance and the communication speed with the electronic tag. Therefore, how to detect the receiving sensitivity of the reader/writer in the operating state becomes one of the technical problems to be solved urgently in the prior art.

Disclosure of Invention

The embodiment of the invention provides a signal receiving sensitivity detection system, which solves the problem of detecting the receiving sensitivity of a reader-writer in a working state.

In a first aspect, a signal receiving sensitivity detection system is provided, which includes a reader/writer, a first circulator and a monitoring device, wherein:

a first port of the first circulator is connected with the reader-writer; after receiving a test signal, the third port of the first circulator sends the test signal to the reader-writer through the first port;

the monitoring device is used for monitoring the receiving error performance information of the test signal in the process of adjusting the strength of the test signal; and determining the corresponding test signal strength as the receiving sensitivity of the reader-writer when the receiving error performance information is smaller than a preset threshold value.

Optionally, a third port of the first circulator is connected to a signal source, and the test signal includes a modulated wave sent by the signal source in a tag encoding manner; the second port of the first circulator is connected to a load.

Optionally, the reception error performance information includes a reception error rate.

Optionally, the test signal comprises a tag echo signal; and the system further comprises a transmit chain and a receive chain, wherein:

the transmitting link comprises a first digital attenuator which is respectively connected with the second port of the first circulator and the first port of the second circulator; the second port of the second circulator is connected with an antenna, and the antenna is communicated with the tag through a wireless link;

the receiving link comprises a carrier wave elimination system, a second digital attenuator and a label signal detection system, wherein the carrier wave elimination system is respectively connected with a third port of a second circulator and one end of the second digital attenuator, the other end of the second digital attenuator is connected with one end of the label signal detection system, and the other end of the label signal detection system is connected with a third port of the first circulator.

Optionally, the transmission link is configured to receive a radio frequency signal sent by the reader through a first port and a second port of the first circulator; and transmitting the received radio frequency signal to the tag through the first and second ports of the second circulator and the antenna;

the receiving link is used for receiving a reflected signal of the radio frequency signal and a tag echo signal sent by the tag through the antenna and a third port of the second circulator; and eliminating the transmitting signal and adjusting the strength of the tag echo signal.

Optionally, canceling the transmission signal by the carrier cancellation system; and adjusting the strength of the tag echo signal by using the second digital attenuator.

Optionally, the reception error performance information includes a reception packet error rate.

In a second aspect, a method for detecting signal receiving sensitivity is provided, which is applied to the above system and includes:

the first port of the first circulator receives a modulated wave sent by the third port of the first circulator, and the modulated wave is sent to the third port of the first circulator by a signal source;

a first port of the first circulator transmits the modulated wave to the reader;

in the process of adjusting the transmitting power of the modulated wave, the monitoring device monitors the receiving error rate of the modulated wave;

and the monitoring device determines that the corresponding modulated wave transmitting power is the receiving sensitivity of the reader-writer when the receiving error rate is smaller than a preset threshold value.

In a third aspect, there is provided another signal receiving sensitivity detection method applied in the above system, the method including:

the first port of the first circulator receives a tag echo signal sent by the third port of the first circulator;

a first port of the first circulator sends the tag echo signal to the reader;

in the process of adjusting the strength of the tag echo signal, the monitoring device monitors the receiving packet error rate of the tag echo signal;

and the monitoring device determines that the corresponding label echo signal intensity is the receiving sensitivity of the reader-writer when the receiving packet error rate is smaller than a preset threshold value.

Optionally, the tag echo signal is obtained by the receiving link by eliminating the reflected signal from the tag echo signal and the reflected signal received from the third port of the second circulator, and the third port of the second circulator receives the tag echo signal and the reflected signal through the second port of the second circulator and the antenna.

The signal receiving sensitivity detection system and method provided by the embodiment of the invention connect the first port of the first circulator with the reader-writer, the third port of the first circulator sends the test signal to the reader-writer through the first port of the first circulator after receiving the test signal, and the monitoring device can monitor the receiving error performance information of the test signal in the process of adjusting the strength of the test signal and determine that the corresponding strength of the test signal is the receiving sensitivity of the reader-writer when the receiving error performance information is smaller than the preset threshold value, thereby solving the problem of detecting the receiving sensitivity of the reader-writer in a working state.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a signal reception sensitivity detection system according to an embodiment of the present invention;

fig. 2a is a schematic structural diagram of a signal reception sensitivity detection system according to another embodiment of the present invention;

FIG. 2b is a schematic diagram of the structure of a signal reception sensitivity detection system according to another embodiment of the present invention;

fig. 3 is a schematic structural view of a signal reception sensitivity detection system according to still another embodiment of the present invention;

fig. 4 is a schematic flow chart of an implementation of a method for detecting signal reception sensitivity according to an embodiment of the present invention;

fig. 5 is a schematic flow chart illustrating an implementation of a method for detecting a signal reception sensitivity according to another embodiment of the present invention.

Detailed Description

In order to solve the problem of detecting the receiving sensitivity of a reader-writer in a working state, the embodiment of the invention provides a system and a method for detecting the receiving sensitivity of a signal.

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are merely for illustrating and explaining the present invention, and are not intended to limit the present invention, and that the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.

It should be noted that the terms "first", "second", and the like in the description and the claims of the embodiments of the present invention and in the drawings described above are used for distinguishing similar objects and not necessarily for describing a particular order or sequence. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.

As shown in fig. 1, which is a schematic structural diagram of a signal reception sensitivity detection system provided in an embodiment of the present invention, including a reader/writer 11, a first circulator 12, and a monitoring device 13, where:

a first port of the first circulator 12 is connected to the reader/writer 11; the third port of the first circulator 12 sends the test signal to the reader/writer 11 through the first port after receiving the test signal;

the monitoring device 13 is configured to monitor reception error performance information of the test signal in a process of adjusting the strength of the test signal; and determining that the corresponding test signal strength is the receiving sensitivity of the reader/writer 11 when the receiving error performance information is smaller than a preset threshold.

It should be noted that, for convenience of description in the drawings, port 1 is used to represent a first port of the first circulator, port 2 is used to represent a second port of the first circulator, and port 3 is used to represent a third port of the first circulator.

The signal reception sensitivity detection system provided by the embodiment of the present invention may be implemented in any of the following manners according to the source of the test signal received by the third port.

The first embodiment:

fig. 2a is a schematic diagram of a possible structure of a signal reception sensitivity detection system according to an embodiment of the present invention, which includes a reader, a first circulator, a transmitting link, a receiving link, a second circulator, and a tag.

The transmitting link is used for receiving radio frequency signals sent by the reader-writer through a first port and a second port of the first circulator; and transmits the received radio frequency signal to the tag through the first port and the second port of the second circulator and the antenna. Preferably, the transmitting chain comprises a first digital attenuator which is respectively connected with the second port of the first circulator and the first port of the second circulator; and the second port of the second circulator is connected with an antenna, and the antenna and the tag communicate through a wireless link.

The receiving link is used for receiving a reflected signal of the radio frequency signal and a tag echo signal sent by the tag through the antenna and a third port of the second circulator; eliminating the transmitted signal and adjusting the strength of the tag echo signal. Specifically, the receiving link may include a carrier cancellation system, a second digital attenuator, and a tag signal detection system, where the carrier cancellation system is connected to the third port of the second circulator and one end of the second digital attenuator, the other end of the second digital attenuator is connected to one end of the tag signal detection system, and the other end of the tag signal detection system is connected to the third port of the first circulator.

Note that, for the second circulator, in the drawing, the first port of the second circulator is denoted by port 1, the second port of the second circulator is denoted by port 2, and the third port of the second circulator is denoted by port 3.

The detection principle of the signal reception sensitivity detection system shown in fig. 2a is as follows: a radio frequency signal transmitted by a reader port passes through a port 1 of a first circulator, a port 2 of the first circulator, a first digital attenuator and a port 1 of a second circulator and is transmitted out through an antenna on a port 2 of the second circulator to activate a tag (or in a conduction mode); due to the non-ideal matching of port 2 of the second circulator to the antenna, energy reflection can be caused, and the reflected signal enters a receiving chain together with a tag echo signal through port 3 of the second circulator; the carrier wave elimination system of the receiving link removes the reflected signal to ensure that only the label echo signal enters the port 3 of the first circulator through the label signal detection system and then enters the port of the reader-writer after passing through the second digital attenuator, so that the interaction process of the reader-writer and the label is realized.

Thus, in this embodiment, the test signal received by port 3 of the first circulator may be a tag echo signal. In order to detect the receiving sensitivity of the reader/writer, in specific implementation, the interaction efficiency when the reader/writer and the tag normally interact needs to be determined. In the embodiment of the invention, the interaction efficiency between the reader and the tag can be determined by the packet error rate or the reduction value of the interaction times in unit time. For example, under normal signal communication, the tag and the reader-writer successfully interact for a time a per minute, and after the strength of the echo signal of the tag is reduced, the tag interacts for a time B. Then the packet error rate can be determined according to the following formula: 1-B/A.

Based on this, in the embodiment of the present invention, the tag is ensured to be just activated by adjusting the transmission power of the reader/writer to be tested and/or the first attenuator of the transmission link, at this time, it is determined that the reader/writer to be tested and the tag are in normal interaction, and the number of successful interactions per minute when the reader/writer and the tag normally interact is recorded, which is assumed to be a.

And then, the signal intensity of the tag echo signal is reduced by adjusting the attenuation value of a second digital attenuator on the receiving link, the intensity of the tag echo signal entering the reader-writer is reduced at the moment, the number of successful interaction times of the tag and the reader-writer in unit time is reduced along with the reduction of the intensity of the tag echo signal, namely, the interaction efficiency of the reader-writer to be tested and the tag is reduced, and when the number of successful interaction times of the tag and the reader-writer in unit time is reduced to a set threshold value, the intensity of the tag echo signal obtained by a tag signal detection system is the receiving sensitivity of the reader-writer to be tested.

The second embodiment:

as shown in fig. 2b, which is a schematic diagram of another possible structure of the signal receiving sensitivity detection system according to the embodiment of the present invention, in a specific implementation, the reader/writer is connected to the port 1 of the first circulator, the load is connected to the port 2 of the first circulator, and the signal source is connected to the port 3 of the first circulator. In this embodiment, the third port of the first circulator may receive a modulated wave transmitted by the signal source in a tag-encoded manner upon receiving the test signal.

The detection principle of the signal reception sensitivity detection system shown in fig. 2b is as follows: the reader-writer normally carries out signal transceiving work, the signal source transmits modulated waves according to a label coding mode, and the reader-writer receives the modulated waves of the signal source and carries out decoding. When the reader demodulates the signal sent by the signal source, the power intensity of the signal sent by the signal source changes to cause the analysis accuracy of the reader to change, so that the error rate of the reader is monitored by reducing the signal transmission power intensity of the signal source. When the error rate reaches a set threshold, the set transmission power intensity of the signal source is the receiving sensitivity of the reader-writer under a certain transmission power.