CN208971497U - A kind of RF preselector - Google Patents

Abstract

The utility model provides a kind of RF preselector; including coupler, pre-selection module, gain control module, lightning strike protection module, voltage monitoring module; the pre-selection module includes pre-selection link submodule and pre-selection filtering submodule; the gain control module includes ARM, FPGA and EPROM; the voltage monitoring module includes amplifier, A/D sampler; the input terminal of the coupler be RF signal input end, the lightning strike protection module respectively with the input terminal of the coupler and connect.The utility model passes through before preselecting module; increase voltage monitoring module; incoming signal level is acquired by voltage monitoring; voltage block is made by FPGA again, then it is program-controlled to carry out dynamic to pre-selection amplification submodule and pre-selection filtering submodule by FPGA, when effectively preventing signal level and being instantaneously saturated; the case where receiving small-signal can not be synchronized; receiver instantaneously received dynamic range is improved, and is additionally arranged lightning proof protection module, prevents from being struck by lightning.

Description

A kind of RF preselector

Technical field

The utility model relates to technology for radio frequency field more particularly to a kind of RF preselectors for receiver.

Background technique

With the rapid development of wireless communication, the mature application and digital modulation reconciliation of image transmitting and ultra-wideband communications The modulation technique of the development of conditioning technology, the wireless transceiver system by taking WI-FI etc. as an example becomes increasingly complex, and signal bandwidth is also increasingly Width, for analog signal bandwidth from initial several hundred KHz, fast development is even broader to current 160MHz, 200MHz.If desired The monitoring of real-time complete pair signals receives analysis and reduction treatment, needs powerful live signal and receives ability.RF preselection Device is the preceding radio frequency receiving module of receiver, can preselect and receive the radiofrequency signal in scope of design.

Existing RF preselector when receiving Larger Dynamic signal, be easy because signal it is excessive cause link linear deterioration and Cause signal level to be instantaneously saturated, block and the synchronous of small-signal is received, reduces receiver and instantaneously receive dynamic range；This Outside, existing RF preselector is not provided with lightning proof, and thunderstorm weather is in application, be subject to be struck by lightning.

Summary of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, a kind of RF preselector is provided, including coupler, Module, gain control module, lightning strike protection module, voltage monitoring module are preselected, the pre-selection module includes pre-selection link submodule Block and pre-selection filtering submodule, the gain control module include ARM, FPGA and EPROM, and the voltage monitoring module includes putting Big device, A/D sampler, the input terminal of the coupler are RF signal input end, the lightning strike protection module respectively with it is described The input terminal and ground connection, first output end of coupler of coupler are connect with the pre-selection link submodule, the coupling The second output terminal of device is connect with the amplifier, and the amplifier is connect with the A/D sampler, the A/D sampler with The FPGA connection, the pre-selection link submodule filters submodule with the pre-selection respectively and the FPGA is connect, described pre- Choosing filtering submodule is connect with the FPGA and RF signal output respectively, the FPGA respectively with the ARM and described EPROM connection.

Preferably, the lightning strike protection module is gas-discharge tube.

Preferably, pre-selection link submodule includes n item pre-selection link, the pre-selection filtering submodule corresponds to the pre-selection Link setting is preselected in link submodule n filter.The n value range is 2≤n≤16, and the filter is using sub- times Sound interval filter.

The beneficial effects of the utility model

The utility model is by increasing voltage monitoring module before preselecting module, by voltage monitoring to input signal electricity It is flat to be acquired, then voltage block is made by FPGA, then FPGA carries out pre-selection amplification submodule and pre-selection filtering submodule It is dynamically program-controlled, when effectively preventing signal level and being instantaneously saturated, the case where receiving small-signal can not be synchronized, ensure that receiver Instantaneous received dynamic range, and it is additionally arranged lightning proof protection module, it prevents from being struck by lightning.

Detailed description of the invention

Fig. 1, the structural schematic diagram of the utility model.

Specific embodiment

As shown in Figure 1, the utility model includes coupler, pre-selection module, gain control module, lightning strike protection module, electricity Press monitoring modular, pre-selection module include pre-selection link submodule and pre-selection filtering submodule, gain control module include ARM, FPGA and EPROM, voltage monitoring module include amplifier, A/D sampler, and the input terminal IN of coupler is RF signal input end RF-IN, the lightning strike protection module respectively with the input terminal of the coupler and connect, coupler the first output end OT1 with The connection of link submodule is preselected, the second output terminal OT2 of coupler is connect with amplifier, and amplifier is connect with A/D sampler, A/ D sampler is connect with FPGA, and pre-selection link submodule is connect with pre-selection filtering submodule and FPGA respectively, pre-selection filtering submodule It is connect respectively with FPGA and RF signal output RF-OUT, FPGA is connect with ARM and EPROM respectively.

The lightning strike protection module that the utility model uses is gas-discharge tube, and when encountering lightning stroke, gas-discharge tube conducting is connect Ground electric discharge, has the function that anti-lightning strike.

Pre-selection link submodule includes n item pre-selection link, and the corresponding pre-selection link submodule of pre-selection filtering submodule is provided with n A filter.N value is set according to the selected band span of preselector and the volume of preselector, and the scope of application is 2≤n ≤ 16, the utility model is suitable for selected band range and is related to 20MHz-26.5GHz, if the smaller general preselector of wave band span Volume requirement is also smaller, such as 2 amplification links then can be used in 20MHz-1GHz, if the body of the larger general preselector of wave band span Product also can be more larger, such as 3GHz-18GHz, then can use 12 amplification links.In addition, filter can use performance Relatively stable suboctave filter.It is control cost and guarantee stability ARM chip in the utility model using 32 The chip of STM32 type, the model of FPGA is using other similar FPGA such as the XC6SLX75T of comparative maturity.ARM is CPU core Chip centroid, FPGA are handled for control, and EPROM is register for storing program.

When utility model works, after radiofrequency signal is inputted by signal input part RF-IN, two-way is divided after coupler Output, all the way through to pre-selection module, after pre-selection link submodule selects corresponding pre-selection link work to amplify or decay It is exported after being filtered again by pre-selection filtering submodule.Each pre-selection link is both provided with amplifier or attenuator, and one As for big signal by attenuator make attenuation processing, small signal then passes through amplifier and makees enhanced processing, specific link setting It needs to be designed according to user demand.In addition it is coupled to voltage monitoring module all the way, converts electric signal for analog signal, then send Being judged to FPGA, FPGA is program-controlled to the gain progress dynamic of pre-selection module, when signal excessive level is instantaneously saturated, FPGA After preparatory differentiation, it on the one hand can turn down big signal and receive corresponding pre-selection link gain, on the other hand will increase synchronization The gain of the corresponding pre-selection link of small-signal is received, therefore receives to synchronize simultaneously in big signal and receives small-signal, is protected The instantaneous dynamic range that receives of card does not reduce.The utility model combination software radio control technology, anticipation before making to input signal, Signal is prejudged by the FPGA that is output to all the way of coupler, is belonged to and is controlled preposition, can preferably prevent the instantaneous of big signal Impact.

Claims (4)

1. a kind of RF preselector, it is characterised in that: including coupler, pre-selection module, gain control module, lightning strike protection mould Block, voltage monitoring module, the pre-selection module include pre-selection link submodule and pre-selection filtering submodule, the gain control molding Block includes ARM, FPGA and EPROM, and the voltage monitoring module includes amplifier, A/D sampler, the input terminal of the coupler For RF signal input end, the lightning strike protection module respectively with the input terminal of the coupler and connect, the coupler First output end is connect with the pre-selection link submodule, and the second output terminal of the coupler is connect with the amplifier, institute It states amplifier to connect with the A/D sampler, the A/D sampler is connect with the FPGA, the pre-selection link submodule point Submodule is not filtered with the pre-selection and the FPGA is connect, and the pre-selection filtering submodule is believed with the FPGA and radio frequency respectively The connection of number output end, the FPGA are connect with the ARM and the EPROM respectively.

2. a kind of RF preselector according to claim 1, it is characterised in that: the lightning strike protection module is gas discharge Pipe.

3. a kind of RF preselector according to claim 1, it is characterised in that: pre-selection link submodule includes the pre-selection of n item Link, the pre-selection filtering submodule, which corresponds to pre-selection link setting in the pre-selection link submodule, n filter.

4. a kind of RF preselector according to claim 3, it is characterised in that: the n value range is 2≤n≤16, institute Filter is stated using suboctave filter.