CN201323585Y - Modulation mode identifying module realized on the basis of digital signal processor - Google Patents

一种基于数字信号处理器实现的调制方式识别模块，包括数字信号处理器，FLASH，外部存储器，LED灯，JTAG插口，视频编码器，还有电源。其中，LED灯为8个，根据调制信号识别结果的不同而亮不同的灯；与视频编码器连接的VGA接口可以外接显示器，显示器上显示的是调制信号识别的结果。数字信号处理器使用2种模式来进行调制方式识别，一种是基于理论决策法的识别模式，另一种是基于循环平稳特性检测法的识别模式，使用哪种模式由输入数据中的控制位来控制。

A modulation mode recognition module based on a digital signal processor, including a digital signal processor, FLASH, external memory, LED light, JTAG socket, video encoder, and power supply. Among them, there are 8 LED lights, and different lights are lit according to the different identification results of the modulation signal; the VGA interface connected to the video encoder can be connected with an external display, and the display shows the identification result of the modulation signal. The digital signal processor uses two modes to identify the modulation mode, one is the identification mode based on the theoretical decision method, and the other is the identification mode based on the cyclostationary characteristic detection method, which mode is used depends on the control bit in the input data to control.

Modulation Mode Recognition module based on the digital signal processor realization

Technical field

The utility model relates to a kind of signal identification device, refers in particular in the radio monitoring field, is positioned at the nucleus module that carries out in spectrum monitoring and the wireless signal judgement system.

Background technology

The existing radio monitoring equipment is mainly by antenna, the radio frequency leading portion, signal processing, storage is transmitted part, power supply, and other peripheral slave parts formations, this signal processing wherein generally comprises digital-to-analogue conversion, Digital Down Convert, narrow band signal extracts and simple spectrum analysis, such as the FFT conversion.Most radio monitoring equipment does not comprise the function of Modulation Identification, generally have only direction finding, spectrum monitoring function, even the signal of certain frequency range of equipment energy demodulation, be because the modulation system information of equipment known this frequency range before monitoring, being that the computer that equipment connects judges modulation system information for its spectrum analysis data according to device transmission, is not to obtain modulation system information in real time by data monitored by equipment.

Summary of the invention

Technical problem: the utility model lacks or not real-time, incomplete problem at Modulation Mode Recognition function in existing radio monitoring and the similar devices thereof, in conjunction with the theoretical result of Modulation Mode Recognition aspect, propose and designed the Modulation Mode Recognition module that realizes based on digital signal processor.

Technical scheme: the utility model solves the technical scheme that its technical problem adopts and is: this module comprises digital signal processor, FLASH, external memory storage, LED lamp, JTAG socket, video encoder, FPGA, VGA interface, power supply; Digital signal processor obtains initial data by the data input port from the external world, communicate by JTAG socket and host computer, be connected with FPGA by data output, and FPGA connects LED lamp and video encoder respectively, video encoder links to each other with the VGA interface by video output, and FLASH, FPGA, digital signal processor, external memory storage all are connected on the EMIF interface.

Described data input port is the expansion mouth, and the initial data that need handle needs and can only input to digital signal processor by this mouth.The external display of described VGA interface, that show on the display is the result of Modulation Signals Recognition.

Wherein, the LED lamp is 8, according to Modulation Signals Recognition result's difference and bright different lamp; The VGA interface that is connected with video encoder can external display, and that show on the display is the result of Modulation Signals Recognition.Digital signal processor uses 2 kinds of patterns to carry out Modulation Mode Recognition, a kind of recognition mode that is based on theoretical Decision Method, and another kind is based on the recognition mode of cyclostationarity detection method, uses which kind of pattern to be controlled by the control bit in the input data.

Beneficial effect:

1, Shi Bie modulation system scope is wide.Digital signal processor has 2 kinds of recognition modes, can discern most modulation system based on the recognition mode of theoretical Decision Method, such as 2/4ASK, 2/4FSK, 2/4PSK, AM, QAM, DSB etc.; Recognition mode based on the cyclostationarity detection method then can be discerned spread-spectrum signal.

2, real-time.Because this action of Modulation Mode Recognition is to carry out in digital signal processor, comparing the computer that is transferred on the equipment of being connected after allowing digital signal processor that a collection of data processing is finished stores, handles and judge, of the present utility model real-time, can in time reflect the variation of the modulation system of unknown signaling.

Description of drawings

Fig. 1 is a hardware block diagram of the present utility model.

Fig. 2 is a data flowchart of the present utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is further described.

As shown in Figure 1, the Modulation Mode Recognition module comprises digital signal processor 1 (model is TMS320DM642), FLASH2 (model is S29GL032M), external memory storage 3 (model is 4MX32T2-7), LED lamp 4, JTAG socket 5, video encoder 6 (model is SAA7105), FPGA7 (model is XC2S300E), VGA interface 8, power supply 9.Digital signal processor obtains initial data by the data input port from the external world, communicate by JTAG socket and host computer, be connected with FPGA by data output, and FPGA connects LED lamp and video encoder, video encoder links to each other with the VGA interface by video output, and FLASH, FPGA, digital signal processor, external memory storage all are connected on the EMIF interface.Wherein, the LED lamp is 8, according to Modulation Signals Recognition result's difference and bright different lamp; The data input port is the expansion mouth, and the initial data that need handle needs and can only input to digital signal processor by this mouth; The VGA interface can external display, and that show on the display is the result of Modulation Signals Recognition.

Be illustrated in figure 2 as the data flowchart in the module, at first, the user will be narrow band signal behind the signal extraction pass to module by the data input port, among all multiports of this data input port, it is control signal that the data of input are flatly arranged, and is mainly used to the control figure signal processor and uses which kind of recognition mode to carry out identification, which kind of display mode demonstration of modulation system.Then, digital signal processor uses corresponding recognition mode program that the signal of importing is carried out the judgement of real-time modulation system according to control signal, again according to control signal, selects to use corresponding display mode that judgment result displays is come out.When using 8 LED lamps to carry out the result when showing, the meaning of the demonstration of 8 lamps is asked for an interview table 1, when using display to show, digital signal processor is passed to FPGA with judged result, FPGA is then according to this result, give video encoder with the character data of modulation system title of storage in advance and carry out video coding, then the video flowing that generates is passed to display and show.

Table 1 result and corresponding LED lamp display format

As show finding, the LED lamp only defines and shows 6 kinds of common modulation systems, as wants all modulation systems are shown, and please use display to show.