CN102970742B - Radio communication system frequency control method and device - Google Patents

Abstract

The invention discloses a frequency control method of a wireless communication system, comprising: a front-end detection device detects the working frequency of a transmitter, a back-end control device detects the working frequency of a receiver; the front-end detection device acquires the working frequency of the receiver, And judge whether the operating frequency of the transmitter is the same as that of the receiver; if the operating frequency of the two is the same, the transmitter and the receiver establish a wireless communication connection; if the operating frequency of the two is not the same, the back-end control device will receive The working frequency of the transmitter is adjusted to the working frequency of the transmitter. The invention also discloses a wireless communication system frequency control device, which includes N transmitters, N front-end detection devices, receivers and back-end control devices, where N≥1. The frequency control method and device of the wireless communication system provided by the present invention can control the working frequency of the receiver, effectively control the quantity of the receiver and its related supporting equipment, and improve the utilization rate of system resources.

Description

Frequency control method and device for wireless communication system

technical field

The present invention relates to the technical field of wireless communication, in particular to a method and device for controlling frequency of a wireless communication system.

Background technique

Wireless communication (Wireless Communication) is a communication method that uses the characteristics that electromagnetic wave signals can propagate freely in space to exchange information. In recent years, wireless communication technology has developed the fastest and is most widely used in the field of communication technology.

Existing wireless communication systems mainly include: mobile cellular network systems, wireless local area network systems, radio and television systems, satellite communication systems, and some short-distance wireless communication networks. Among them, the mobile cellular network system mainly includes the Global System of Mobile Communication (GSM for short) of the second generation mobile communication technology; the General Packet Radio Service (GPRS for short); the Code Division Multiple Access 2000 (Code Division Multiple Access 2000 , CDMA2000 for short), Wideband Code Division Multiple Access (WCDMA for short), and Time Division Synchronous Code Division Multiple Access technology (TimeDivision-Synchronous Code Division Multiple Access, TD-SCDMA for short) with independent intellectual property rights in my country. The WLAN system mainly includes Wireless Fidelity (Wi-Fi for short) and Worldwide Interoperability for Microwave Access (WiMax for short).

At present, the wireless communication system has been widely used in the fields of fire protection, water conservancy, transportation, security and national defense. It can realize the real-time connection between the scene and the back-end command and control center to realize the emergency response to emergencies.

When the wireless communication system is working, each transmitter uses a different frequency (different frequency) to work, first through modulation, such as Frequency Modulation (FM for short), Amplitude Modulation (AM for short), etc., and then After data conversion, encryption/decryption, etc., the real-time situation of each site is sent to the receiver of the back-end command and control center by means of wireless communication connection.

Wireless communication technology is classified according to the working frequency band or transmission means, including medium wave communication, short wave communication, ultrashort wave communication, microwave communication and satellite communication. Each specific working frequency in the working frequency band mainly refers to the radio frequency (Radio Frequency, referred to as RF) frequency when the transmitter transmits and the receiver receives, and the radio frequency refers to the frequency suitable for radio transmission, propagation and reception.

In the existing wireless communication system, the physical positions of multiple transmitters are usually arranged in different places, while the receivers are fixedly placed in the back-end command and control center and other places. In order to ensure the normal communication connection between the transmitter and the receiver, the back-end command center in the system must be equipped with the same number of receivers as the transmitter, and they must use the same working frequency as the transmitter in one-to-one correspondence. For example, if a wireless communication system includes 10 transmitters, then the back-end command center will need to be equipped with 10 receivers correspondingly to receive signals from the 10 transmitters, but the 10 receivers The point of difference is usually only their respective operating frequency. When the scale of the wireless communication system is large, the number of transmitters at the front end of the system continues to increase, and the command center at the back end will have a large number of receivers and related equipment, which also makes the structure of the wireless communication system too complicated.

Therefore, the current wireless communication system generally has defects such as complex structure, low resource utilization, serious frequency interference and high construction cost.

Contents of the invention

The technical problem to be solved by the present invention is to provide a wireless communication system frequency control method and device, which can reduce the number of receiving devices in the back-end command center and improve the utilization rate of system resources by controlling the operating frequency of the wireless communication system .

In order to solve the above technical problems, the present invention provides a frequency control method for a wireless communication system, comprising the following steps:

The front-end detection device detects the operating frequency of the transmitter, and the back-end control device detects the operating frequency of the receiver; each transmitter uses different frequencies to work, and uses different frequencies to convey the frequency of each transmitter. On-site information to the receiver;

The front-end detection device sends a query command to the back-end control device to obtain the operating frequency of the receiver;

The front-end detection device judges whether the operating frequency of the transmitter is the same as that of the receiver;

When the operating frequency of the transmitter is the same as that of the receiver, the transmitter establishes a wireless communication connection with the receiver;

When the operating frequency of the transmitter is different from the operating frequency of the receiver, the front-end detection device sends a frequency modification command to the back-end control device; the back-end control device according to the frequency modification command, After adjusting the working frequency of the receiver to the working frequency of the transmitter, the transmitter establishes a wireless communication connection with the receiver.

The present invention also provides a wireless communication system frequency control device, including N transmitters, N front-end detection devices, receivers and back-end control devices, N≥1;

The N transmitters are connected to the N front-end detection devices in one-to-one correspondence; the receivers are connected to the back-end control device; each transmitter uses a different frequency to work, and adopts a different frequency method to convey the site information of each transmitter to the receiver;

The front-end detection device is used to detect the working frequency of the transmitter, and the back-end control device is used to detect the working frequency of the receiver;

The front-end detection device is also used to send a query command to the back-end control device to obtain the operating frequency of the receiver;

The front-end detection device is also used to determine whether the operating frequency of the transmitter is the same as that of the receiver;

When the operating frequency of the transmitter is the same as that of the receiver, the transmitter establishes a wireless communication connection with the receiver;

When the operating frequency of the transmitter is different from the operating frequency of the receiver, the front-end detection device sends a frequency modification command to the back-end control device; the back-end control device according to the frequency modification command, After adjusting the working frequency of the receiver to the working frequency of the transmitter, the transmitter establishes a wireless communication connection with the receiver.

The frequency control method and device of the wireless communication system provided by the present invention enable one receiver in the wireless communication system to receive information transmitted by multiple transmitters by controlling the operating frequency of the receiver in the wireless communication system, avoiding receiving The number of transmitters must be the same as the number of transmitters at the front end of the system, and the operating frequency corresponds to the same situation, which greatly improves the utilization of system resources and effectively reduces frequency interference in the system. Especially when the wireless communication system has a large scale and has many transmitting devices, the excellent performance of the wireless communication system frequency control method and device provided by the present invention is more obvious, which can effectively reduce the complexity of the system structure and the system construction cost. Improve equipment utilization.

Description of drawings

FIG. 1 is a schematic structural diagram of a first embodiment of a frequency control method for a wireless communication system provided by the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of a method for controlling frequency of a wireless communication system provided by the present invention;

FIG. 3 is a schematic structural diagram of a first embodiment of a frequency control device for a wireless communication system provided by the present invention;

FIG. 4 is an overall structural diagram of the frequency control device for the wireless communication system provided in FIG. 3;

Fig. 5 is a schematic structural diagram of a second embodiment of a frequency control device for a wireless communication system provided by the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

Referring to FIG. 1 , it is a schematic structural diagram of a first embodiment of a method for controlling frequency of a wireless communication system provided by the present invention.

In this embodiment, the transmitting device of the wireless communication system includes a front-end detection device and a transmitter, and the receiving device includes a back-end control device and a receiver. During specific implementation, the described wireless communication system frequency control method includes the following steps:

Step 101: the front-end detection device detects the operating frequency of the transmitter, and the back-end control device detects the operating frequency of the receiver.

During the specific implementation, each transmitter uses different frequencies to work, that is, different frequencies are used to convey the site information of each transmitter to the receiver. The front-end detection device detects the transmitter to obtain its working frequency, and the back-end control device detects the receiver to obtain its working frequency. The front-end detection device and the back-end control device respectively grasp the working status of the transmitter and receiver, so as to extract the working frequency of the transmitter or receiver in subsequent processing.

Step 102: the front-end detection device sends a query instruction to the back-end control device to acquire the working frequency of the receiver.

After the front-end detection device obtains the working frequency of the receiver, it simultaneously grasps the working frequency parameters of the transmitter and the receiver, so as to compare the working frequencies of the transmitter and the receiver.

Step 103: The front-end detection device judges whether the working frequency of the transmitter is the same as that of the receiver.

When the operating frequency of the transmitter is the same as that of the receiver, perform step 105; when the operating frequency of the transmitter is different from that of the receiver, perform step 104.

Step 104: The front-end detection device sends a frequency modification command to the back-end control device; the back-end control device adjusts the operating frequency of the receiver to the operating frequency of the transmitter according to the frequency modification command .

Step 105: The transmitter establishes a wireless communication connection with the receiver.

Referring to FIG. 2 , it is a schematic structural diagram of a second embodiment of a method for controlling frequency of a wireless communication system provided by the present invention.

The difference between this embodiment and the first embodiment is that, specifically, the front-end detection device further includes a frequency detection module and a transmitter wireless module, and the back-end control device further includes a control module and a receiver wireless module.

During specific implementation, the described wireless communication system frequency control method includes the following steps:

Step 201: The frequency detection module detects the operating frequency of the transmitter, and sends the operating frequency of the transmitter to the wireless module at the transmitting end; the control module performs a check on the operating frequency of the receiver detect, and send the working frequency of the receiver to the wireless module at the receiving end.

The same as the first embodiment, in the implementation of this embodiment, each transmitter also transmits the site information of each transmitter to the receiver in a different-frequency manner. Specifically, the frequency detection module in the front-end detection device detects the operating frequency of the transmitter, and the control module in the back-end control device detects the operating frequency of the receiver; Operating frequency, the wireless module of the receiving end obtains the operating frequency of the receiver detected by the control module, so as to facilitate the "frequency interaction" between the transmitting end and the receiving end in the wireless communication system.

Step 202: The transmitter wireless module sends a query command to the receiver wireless module to acquire the working frequency of the receiver, and sends it to the frequency detection module.

After the transmitter wireless module obtains the operating frequency of the receiver, it is sent to the frequency detection module, and the frequency detection module simultaneously grasps the operating frequency parameters of the transmitter and the receiver, so as to facilitate the operation of the transmitter and the receiver. Frequency comparison.

Step 203: The frequency detection module judges whether the operating frequency of the transmitter is the same as that of the receiver.

When the operating frequency of the transmitter is the same as the operating frequency of the receiver, perform step 205;

When the working frequency of the transmitter is different from that of the receiver, step 204 is performed.

Step 204: The frequency detection module generates a frequency modification command, and transmits it to the transmitter wireless module; the transmitter wireless module sends the frequency modification command to the receiver wireless module; the frequency modification The command is transmitted to the control module after being received by the wireless module at the receiving end; the control module adjusts the working frequency of the receiver to the working frequency of the transmitter according to the frequency modification command.

Step 205: The transmitter establishes a wireless communication connection with the receiver.

Further, in this embodiment, the frequency modification command includes verification information. When step 204 is executed, specifically, after receiving the frequency modification command, the control module in the back-end control device parses out the verification information in the frequency modification command, and after the verification is correct, the control module sends A control signal is sent to the receiver, and the operating frequency of the receiver is adjusted to the operating frequency of the transmitter.

During specific implementation, the control module parses out the new operating frequency in the frequency modification command according to the frequency modification command sent by the wireless module of the transmitter, according to the preset decoding method, channel identification, command word and other parameters; the control module The automatic modification of the working frequency of the receiver can only be completed after the frequency modification command is correctly parsed. At this time, the control module switches the new working frequency to the current working frequency of the receiver, and the original working frequency can be used as a backup frequency, so that it can be called or switched at any time in the later communication.

Furthermore, in this embodiment, the wireless module at the receiving end receives the frequency modification command of the wireless module at the transmitting end through frequency modulation or general packet radio service. During specific implementation, the communication between the wireless module at the transmitting end and the wireless module at the receiving end may be carried out by means of FM frequency modulation or GPRS, but it is not limited to these two communication methods.

The beneficial effect of implementing the wireless communication system frequency control method provided by the embodiment of the present invention is that the control of the operating frequency of the receiver in the command center at the back end of the system can be realized, so that the operating frequency of the receiver and each transmitter at the front end of the system Matching, so as to realize the communication connection between multiple transmitters and one receiver, can effectively save the frequency resources of the receiver, and effectively control the number of receivers and related supporting equipment in the back-end command center of the system.

Referring to FIG. 3 , it is a schematic structural diagram of a first embodiment of a frequency control device for a wireless communication system provided by the present invention.

In this embodiment, the wireless communication system frequency control device includes N transmitters 100 , N front-end detection devices 200 , receivers 300 and back-end control devices 400 , where N≥1.

The N transmitters 100 are connected to the N front-end detection devices 200 in one-to-one correspondence; the receiver 300 is connected to the back-end control device 400 .

The front-end detection device 200 is used to detect the working frequency of the transmitter 100 , and the back-end control device 400 is used to detect the working frequency of the receiver 300 .

The front-end detection device 200 is also configured to send a query command to the back-end control device 400 to acquire the working frequency of the receiver 300 .

The front-end detection device 200 is also used to determine whether the operating frequency of the transmitter 100 is the same as that of the receiver 400 .

When the operating frequency of the transmitter 100 is the same as that of the receiver 300 , the transmitter 100 establishes a wireless communication connection with the receiver 300 .

When the working frequency of the transmitter 100 is different from the working frequency of the receiver 300, the front-end detection device 200 sends a frequency modification command to the back-end control device 400; the back-end control device 400 according to the The frequency modification command is used to adjust the operating frequency of the receiver 300 to the operating frequency of the transmitter 100, and the transmitter 100 establishes a wireless communication connection with the receiver 300.

In this embodiment, the working principle of the frequency control device of the wireless communication system is: the front-end detection device 200 compares the detected working frequency of the transmitter 100 with the working frequency of the receiver 300 detected by the back-end control device 400 , if the two are the same, the transmitter 100 can directly establish a wireless communication connection with the receiver 300; if the two are not the same, the front-end detection device 200 generates a frequency modification command, and sends the frequency modification command to the back-end control device 400 ; The backend control device 400 modifies the operating frequency of the receiver 300 according to the frequency modification command; when the operating frequency of the receiver 300 and the transmitter 100 are the same, the two establish a wireless communication connection.

It should be noted that FIG. 3 only shows the corresponding connection between one transmitter 100 and one front-end detection device 200 , and only shows the communication connection between one transmitter 100 and the receiver 300 . In fact, there are N transmitters 100 in the wireless communication system frequency control device in this embodiment, and the N transmitters 100 correspond to one receiver 300 . Wherein, N is a natural number, and N≥1.

Referring to FIG. 4 , it is an overall structural diagram of the frequency control device for the wireless communication system provided in FIG. 3 .

As shown in Figure 4, in the specific implementation process, a transmitter 100 and a front-end detection device 200 can be used as a transmitting device, and a receiver 300 and a back-end control device 400 can be used as a receiving device. equipment. Then in the wireless communication system frequency control device provided in FIG. 3 , there are N transmitting devices (see FIG. 4 for transmitting device 1, transmitting device 2, ..., transmitting device N), and the N transmitting devices Together they correspond to a receiving device.

Apparently, in actual implementation, in the wireless communication system frequency control device provided in this embodiment, as the number of its transmitting equipment increases, the number of its receiving equipment can also be appropriately increased, instead of using The number of receivers or receiving devices is limited to only one. That is, the frequency control apparatus for a wireless communication system provided by the embodiment of the present invention may have M additional transmitting devices, which jointly correspond to another receiving device. Wherein, M is a natural number, and M≥1.

Referring to FIG. 5 , it is a schematic structural diagram of a second embodiment of a frequency control device for a wireless communication system provided by the present invention.

The difference between this embodiment and the embodiment shown in FIG. 3 is that the front-end detection device 200 further includes a frequency detection module 210 and a transmitter wireless module 220, and the back-end control device 400 further includes a control module 410 and a receiver wireless module 420 .

Specifically, the transmitter 100 is connected to the frequency detection module 210, and the frequency detection module 210 is also connected to the transmitter wireless module 220; the receiver 300 is connected to the control module 410, and the control The module 410 is also connected with the receiving end wireless module 420 .

The frequency detection module 210 is used to detect the working frequency of the transmitter 100 and send the working frequency of the transmitter 100 to the wireless module 420 of the transmitting end.

The control module 410 is used to detect the working frequency of the receiver 300 and send the working frequency 300 of the receiver to the wireless module 420 at the receiving end.

The transmitter wireless module 220 is configured to send a query command to the receiver wireless module 420 to acquire the working frequency of the receiver 300 and send it to the frequency detection module 210 .

The frequency detection module 210 is also used to determine whether the operating frequency of the transmitter 100 is the same as that of the receiver 300 .

When the operating frequency of the transmitter 100 is the same as that of the receiver 300 , the transmitter 100 establishes a wireless communication connection with the receiver 300 .

When the operating frequency of the transmitter 100 is different from that of the receiver 300 , the frequency detection module 210 generates a frequency modification command and transmits it to the wireless module 220 of the transmitter.

The transmitter wireless module 220 is also configured to send the frequency modification command to the receiver wireless module 420; the frequency modification command is transmitted to the control module 410 after being received by the receiver wireless module 420; The control module 410 adjusts the operating frequency of the receiver 300 to the operating frequency of the transmitter 100 according to the frequency modification command; the transmitter 100 establishes a wireless communication connection with the receiver 300 .

Further, in the wireless communication system frequency control device provided in this embodiment, the frequency modification command includes verification information; the control module 410 in the back-end control device 400 is also configured to receive the frequency modification command , analyze the verification information in the frequency modification command; after the verification is correct, the control module 410 is further configured to send a control signal to the receiver 300 to adjust the operating frequency of the receiver 300 to the The operating frequency of the transmitter 100.

Furthermore, in the frequency control device for a wireless communication system provided in this embodiment, the wireless module 420 at the receiving end receives the frequency modification command from the wireless module 220 at the transmitting end through frequency modulation or general packet radio service.

During specific implementation, the communication between the transmitter wireless module 220 and the receiver wireless module 420 can be carried out by using FM frequency modulation (ie frequency modulation mode) or GPRS mode (ie general packet radio service mode), but not only Limited to these two communication methods.

In this embodiment, the working principle of the frequency control device of the wireless communication system is: the frequency detection module 210 first detects the operating frequency of the transmitter 100 at the transmitting end of the system where it is located, and then receives commands from the back end of the system through the wireless module 220 at the transmitting end. The operating frequency of the central receiver 300, and then determine whether the operating frequencies of the transmitter 100 and the receiver 300 are consistent. If the operating frequencies of the two are consistent, the transmitter 100 and the receiver 200 can directly establish a wireless communication connection; The frequency modification command is transmitted to the wireless module 420 of the receiving end; the wireless module 420 of the receiving end transmits the frequency modification command to the control module 410; the control module 410 correctly analyzes the operating frequency of the transmitter 100, and then modifies the operating frequency of the receiver 300 is the operating frequency of the transmitter 100. When the operating frequencies of the receiver 300 and the transmitter 100 are the same, the two can establish a wireless communication connection.

It should be noted that, the same as the embodiment shown in FIG. 3 , only one transmitter 100 and one front-end detection device 200 are connected correspondingly in FIG. 5 , and only one transmitter 100 and receiver 300 communication connections. In fact, there are N transmitters 100 in the wireless communication system frequency control device in this embodiment, and the N transmitters 100 correspond to one receiver 300 . Wherein, N is a natural number, and N≥1.

The frequency control method and device of the wireless communication system provided by the embodiments of the present invention enable one receiver in the wireless communication system to receive information transmitted by multiple transmitters by controlling the operating frequency of the receiver in the wireless communication system, Effectively controlling the number of receivers and related supporting equipment greatly improves the utilization rate of system resources and effectively reduces frequency interference in the system. Especially when the scale of the wireless communication system is large and the number of transmitters is continuously increasing, the excellent performance of the wireless communication system frequency control method and device provided by the embodiments of the present invention is more obvious, which can effectively reduce the complexity of the system structure and the system Reduce construction costs and improve the utilization of system equipment resources.

The above description is a preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Claims (8)

1. a radio communication system frequency control method, it is characterised in that, comprise the following steps:

The operating frequency of emitter is detected by front-end detection device, and the operating frequency of receiving apparatus is detected by rear end control device; Each emitter adopts mutually different frequency to carry out work, adopts the mode of different frequency to pass on the field data of every platform emitter to receiving apparatus;

Described front-end detection device sends query statement to described rear end control device, obtains the operating frequency of described receiving apparatus;

Described front-end detection device judges that whether the operating frequency of the operating frequency of described emitter and described receiving apparatus is identical;

When the operating frequency of described emitter is identical with the operating frequency of described receiving apparatus, described emitter is set up radio communication with described receiving apparatus and is connected;

When the operating frequency of described emitter is not identical with the operating frequency of described receiving apparatus, the amendment order of described front-end detection device transmission frequency is to described rear end control device; Described rear end control device is according to described frequency modification order, and after the operating frequency of described receiving apparatus is adjusted to the operating frequency of described emitter, described emitter is set up radio communication with described receiving apparatus and is connected.

2. radio communication system frequency control method as claimed in claim 1, it is characterized in that, described front-end detection device comprises frequency detection module further and launches end wireless module, and described rear end control device comprises control module and receiving end wireless module further, and described method comprises:

The operating frequency of described emitter is detected by described frequency detection module, and the operating frequency of described emitter is sent to described transmitting end wireless module;

The operating frequency of described receiving apparatus is detected by described control module, and the operating frequency of described receiving apparatus is sent to described receiving end wireless module;

Described transmitting end wireless module sends query statement to described receiving end wireless module, obtains the operating frequency of described receiving apparatus, and the operating frequency of described receiving apparatus is sent to described frequency detection module;

Described frequency detection module judges that whether the operating frequency of the operating frequency of described emitter and described receiving apparatus is identical;

When the operating frequency of described emitter is identical with the operating frequency of described receiving apparatus, described emitter is set up radio communication with described receiving apparatus and is connected;

When the operating frequency of described emitter is not identical with the operating frequency of described receiving apparatus, described frequency detection module produces frequency modification order, and gives described transmitting end wireless module by described frequency modification command transfer;

Described frequency modification order is sent to described receiving end wireless module by described transmitting end wireless module;

Described frequency modification order is transferred to described control module after described receiving end wireless module receives; Described control module is according to described frequency modification order, and after the operating frequency of described receiving apparatus is adjusted to the operating frequency of described emitter, described emitter is set up radio communication with described receiving apparatus and is connected.

3. radio communication system frequency control method as claimed in claim 2, it is characterised in that, described frequency modification order comprises verification information;

After control module in the control device of described rear end receives described frequency modification order, parse the verification information in described frequency modification order, verify errorless after, described control module sends a control signal to described receiving apparatus, and the operating frequency of described receiving apparatus is adjusted to the operating frequency of described emitter.

4. radio communication system frequency control method as described in item as arbitrary in claim 2��3, it is characterised in that, described receiving end wireless module receives the frequency modification order of described transmitting end wireless module by frequency modulated mode or general packet radio service mode.

5. a radio communication system frequency control device, it is characterised in that, comprise N platform emitter, N platform front-end detection device, receiving apparatus and rear end control device, N >=1;

Described N platform emitter and described N platform front-end detection device connect one to one; Described receiving apparatus is connected with described rear end control device; Each emitter adopts mutually different frequency to carry out work, adopts the mode of different frequency to pass on the field data of every platform emitter to receiving apparatus;

Described front-end detection device is used for the operating frequency to described emitter and detects, and described rear end control device is used for the operating frequency to described receiving apparatus and detects;

Described front-end detection device also for sending query statement to described rear end control device, obtains the operating frequency of described receiving apparatus;

Also whether operating frequency for the operating frequency and described receiving apparatus that judge described emitter is identical for described front-end detection device;

When the operating frequency of described emitter is identical with the operating frequency of described receiving apparatus, described emitter is set up radio communication with described receiving apparatus and is connected;

When the operating frequency of described emitter is not identical with the operating frequency of described receiving apparatus, the amendment order of described front-end detection device transmission frequency is to described rear end control device; Described rear end control device is according to described frequency modification order, and after the operating frequency of described receiving apparatus is adjusted to the operating frequency of described emitter, described emitter is set up radio communication with described receiving apparatus and is connected.

6. radio communication system frequency control device as claimed in claim 5, it is characterized in that, described front-end detection device comprises frequency detection module further and launches end wireless module, and described rear end control device comprises control module and receiving end wireless module further;

Described emitter is connected with described frequency detection module, and described frequency detection module is also connected with described transmitting end wireless module; Described receiving apparatus is connected with described control module, and described control module is also connected with described receiving end wireless module;

Described frequency detection module is used for the operating frequency to described emitter and detects, and the operating frequency of described emitter is sent to described transmitting end wireless module;

Described control module is used for the operating frequency to described receiving apparatus and detects, and the operating frequency of described receiving apparatus is sent to described receiving end wireless module;

Described transmitting end wireless module is used for sending query statement to described receiving end wireless module, obtains the operating frequency of described receiving apparatus, and the operating frequency of described receiving apparatus is sent to described frequency detection module;

Also whether operating frequency for the operating frequency and described receiving apparatus that judge described emitter is identical for described frequency detection module;

When the operating frequency of described emitter is identical with the operating frequency of described receiving apparatus, described emitter is set up radio communication with described receiving apparatus and is connected;

When the operating frequency of described emitter is not identical with the operating frequency of described receiving apparatus, described frequency detection module produces frequency modification order, and gives described transmitting end wireless module by described frequency modification command transfer;

Described transmitting end wireless module is also for being sent to described receiving end wireless module by described frequency modification order; Described frequency modification order is transferred to described control module after described receiving end wireless module receives; The operating frequency of described receiving apparatus, according to described frequency modification order, is adjusted to the operating frequency of described emitter by described control module; Described emitter is set up radio communication with described receiving apparatus and is connected.

7. radio communication system frequency control device as claimed in claim 6, it is characterised in that, described frequency modification order comprises verification information;

Control module in the control device of described rear end is also for after receiving described frequency modification order, parsing the verification information in described frequency modification order; Verify errorless after, the operating frequency of described receiving apparatus also for sending a control signal to described receiving apparatus, is adjusted to the operating frequency of described emitter by described control module.

8. radio communication system frequency control device as described in item as arbitrary in claim 6��7, it is characterised in that, described receiving end wireless module receives the frequency modification order of described transmitting end wireless module by frequency modulated mode or general packet radio service mode.