CN204190761U - A kind of high integration ultrashort wave radio set receiving and transmitting front end module - Google Patents
A kind of high integration ultrashort wave radio set receiving and transmitting front end module Download PDFInfo
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- CN204190761U CN204190761U CN201420735256.2U CN201420735256U CN204190761U CN 204190761 U CN204190761 U CN 204190761U CN 201420735256 U CN201420735256 U CN 201420735256U CN 204190761 U CN204190761 U CN 204190761U
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Abstract
The utility model provides a kind of high integration ultrashort wave radio set receiving and transmitting front end module, comprise power subsystem, digital control unit, crystal oscillator unit, frequently combine unit, front bill unit, rf receiver unit, electrically regulated filtering unit, AGC unit in mixing unit and two, in described rf receiver unit, two AGC unit and front bill unit simulation AGC path on set up digital AGC path.The utility model increases digital AGC scheme on the basis of traditional analog AGC scheme, this module is made can be better applicable to ultrashort wave normal voice and digital communication, under digital AGC mode, front signalling amplitude can be stablized in 30 μ s, and Received signal strength amplitude can be stablized in 200 μ s.
Description
Technical field
The utility model relates to ultrashort wave radio set field, especially relates to a kind of high integration ultrashort wave radio set receiving and transmitting front end module.
Background technology
In ultrashort wave radio set, the effect of receiving and transmitting front end is divided into reception and launches two parts.During reception, by the radiofrequency signal in the frequency range that receives from antenna, after LNA process, after electrically regulated filtering, be down-converted to the second IF-FRE signal respectively with after the first local oscillation signal and twice mixing of the second local oscillation signal, control to send after (AGC) to do demodulation process with modulatedemodulate tuned plate through signal automatic gain in two; During transmitting, by the modulated intermediate frequency signal that modulatedemodulate tuned plate is sent here, respectively with the first local oscillator and the second local oscillation signal mixing, will transmit and upconvert to tranmitting frequency point, send and power amplifier module after the automatic growth control that transmits.
Conventional ultrashort wave radio set receiving and transmitting front end module, normally be made up of two modules, receive path is as a module, and the amplification, filtering, down-conversion, automatic growth control etc. that have been used for received RF signal, be also responsible for the filtering transmitted, amplification, gain control etc. simultaneously; Intermediate-freuqncy signal, as a module, for receive path provides local oscillation signal, is upconverted to the first-class function of tranmitting frequency by frequency synthesis part.
Conventional ultrashort wave radio set receiving and transmitting front end module, the AGC mode of receive path and transmission channel, normally by radiofrequency signal through wave detector, convert the low-frequency voltage of reflected signal amplitude envelops to, after RC low pass filter, export the gradual voltage of direct current of reflected signal changes in amplitude trend, control voltage-controlled attenuator, to reach the object controlling to export level of RF signals, both AGC scheme had been simulated, as Fig. 1, shown in Fig. 2, in its receive path, in order to meet the great dynamic range of Received signal strength, usually one-level AGC is also had to control at radio frequency reception end, mainly suppress large-signal, prevent signal in late-class circuit from occurring saturation distortion.In simulation AGC scheme, for ensuring signal quality, RC time constant is general larger, and AGC stabilization time is usually more than 100ms.Conventional simulated voice communication station, can ensure normal talking function between radio station this time of delay.Communication station is passed for determining frequency, between radio station, communication carries out in of short duration packet mode, in communication time slot, the shortest packet time length is only less than 10ms, for ensureing the normal demodulation of modulation /demodulation module, intermediate-freuqncy signal amplitude is at least wanted to reach stable state being less than in 500 μ s times, if adopt conventional AGC control mode, then because auto level control can not respond in time, easily to cause in receive path amplifier operation at oversaturated nonlinear state, and by the time automatic control electric is flat start response after, signal terminates, cause whole bag signal all at distortion status, and for long bag signal, can cause exiting saturated at the mid portion of a bag signal, cause distorted signals equally, affect the demodulation of intermediate-freuqncy signal.If less the C value setting in RC filter, AGC response speed is very fast, but it is larger that the detecting circuit of signal can be caused to fluctuate, channel gain is fluctuated, cause signal amplitude to fluctuate, the error vector magnitude (EVM) of degrade signal, make intermediate-freuqncy signal cannot demodulation.
Utility model content
The purpose of this utility model is: for prior art Problems existing, a kind of high integration ultrashort wave radio set receiving and transmitting front end module is provided, solve the existing ultrashort wave radio set receiving and transmitting front end module scope of application narrower, especially when be used in determine frequency pass on communication station time, easily cause the problem of distorted signals.
The purpose of this utility model is achieved through the following technical solutions: a kind of high integration ultrashort wave radio set receiving and transmitting front end module, comprise power subsystem, digital control unit, crystal oscillator unit, frequently combine unit, front bill unit, rf receiver unit, electrically regulated filtering unit, AGC unit in mixing unit and two, it is characterized in that, in described rf receiver unit, two AGC unit and front bill unit simulation AGC path on set up digital AGC path.
Preferably, described digital AGC path comprises single-chip microcomputer and DA chip, the GPIO mouth of described single-chip microcomputer is connected with DA chip, a delivery outlet of this DA chip connects the voltage control port of electrically regulated filtering unit, another delivery outlet connects the AGC control port of rf receiver unit and the AGC control port of front bill unit respectively by a PTT Signal-controlled switch, described single-chip microcomputer two DA delivery outlets connect the two-stage voltage control port of AGC unit in two respectively, the detecting circuit delivery outlet of described rf receiver unit and front bill unit is connected to an AD input channel of single-chip microcomputer, in described two, the detecting circuit delivery outlet of AGC unit connects another AD input channel of single-chip microcomputer.
Preferably, described digital AGC path comprises four moulds/number AGC selector switch, and one is located at rf receiver unit, and two are located at AGC unit in two, and last is located at front bill unit.
Preferably, it is characterized in that, the model of described single-chip microcomputer is C8051F120.
Compared with prior art, traditional Dual module function i ntegration in single module, was both met volume by receiving and transmitting front end module of the present utility model, and the requirement of weight, meets index request again; On the basis of traditional analog AGC scheme, increase digital AGC scheme, make this module better can be applicable to short wave communication, under digital AGC mode, front signalling amplitude can be stablized in 30 μ s, and Received signal strength amplitude can be stablized in 200 μ s simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that tradition adopts the receive path of the ultrashort wave radio set receiving and transmitting front end module of simulation AGC scheme;
Fig. 2 is the circuit diagram that tradition adopts the transmission channel of the ultrashort wave radio set receiving and transmitting front end module of simulation AGC scheme;
Fig. 3 is receiving and transmitting front end inside modules positive and negative layout of the present utility model;
Fig. 4 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment
The utility model is the receiving and transmitting front end module for easy data chain product, because system proposes requirement to machine volume and weight, in order to reduce volume and the weight of receiving and transmitting front end module, receiving and transmitting front end adopts the design philosophy of parting blocking, frequency synthesizing module and transceiver channel is designed in the module of an independent closed.Inside modules is according to the difference of element circuit function, be divided into different individual cavity, be distributed in the two sides of receiving and transmitting front end module inside, one side is provided with power module cavity, frequently combines circuit module cavity, radiating circuit module cavity, crystal oscillating circuit cavity, control module cavity, corresponding placement power subsystem, combines unit frequently respectively, front bill unit, crystal oscillator unit, digital control unit; Another side in module is provided with AGC (signal gain control) circuit cavity in receiving front-end cavity, electrically regulated filtering circuit cavity, mixting circuit cavity, two, respectively AGC unit in corresponding placement rf receiver unit, electrically regulated filtering unit, mixing unit, two.Aforementioned each cavity is mutually isolated airtight aluminium alloy cavity, and this structure effectively can shield electromagnetic radiation and the interference etc. each other of each modular circuit.Simultaneously by the function i ntegration of traditional Dual module (receiver module and frequency source module) in an independent closed module, as shown in Figure 3.Wherein power module provides various required burning voltage for whole inside modules; Front bill unit complete the up-conversion of transmission channel, filtering, amplification, transmission channel AGC control; Frequently unit is combined for receive and transmitting path provides the first local oscillator needed for mixing and the second local oscillation signal; Crystal oscillator unit provides 32.512MHz reference frequency source for module; Digital control unit is receiving and transmitting front end internal control unit, for the digital AGC of the control of electrically tunable filter, reception and transmission channel; Rf receiver unit is front-end radiofrequency signal treatment circuit, comprises voltage-controlled decay and LNA part; Electrically regulated filtering unit is used for radio frequency signal and does filtering frequency-selecting process; Mixing unit completes twice down-conversion to received signal, and radiofrequency signal is converted to intermediate-freuqncy signal.In two, AGC unit completes the gain control function to signal in two.
For the drawback of determining to adopt in frequency data radio station traditional ultrashort wave radio set receiving and transmitting front end to simulate AGC control program, the one of design can fast and stable signal amplitude, again can not the low cost control program of degrade signal quality.Both on traditional AGC scheme basis, by increasing the digital AGC circuit of a single-chip microcomputer as main control chip, pass through control program, according to radiofrequency signal detecting circuit sampled value, pass through control algolithm, calculate control voltage, exported by control chip DA, reach the object of digital AGC.Wherein analog-and digital-AGC two kinds of modes are optional, when conversing for normal voice, and gating simulation AGC path, when for several arq mode, gated digital AGC path.The hardware of this front-end module as shown in Figure 4, on traditional analog AGC path basis, adds digital AGC path, both in rf receiver unit, two AGC unit and front bill unit simulation AGC path on add digital AGC path.Adopt C8051F120 single-chip microcomputer as the control chip of digital channel.Wherein receiving and transmitting front end inside needs two-stage AGC voltage in received RF AGC voltage, two, frontly generates AGC voltage, electricity adjusts voltage totally five tunnel control voltages, and C8051F120 single-chip microcomputer only has two-way DA to export, therefore need to extend out a DA chip, consider receiving and transmitting front end inside modules, work when receiving different with transmitting path, radio frequency reception end AGC voltage and front AGC voltage can multiplexing same road DA.So only need to extend out a chip having two-way DA to export.What adopt in the present invention is that AD7302 is as outside DA, using the GPIO mouth of C8051F120 as the data of outside DA and control port, the one road DA of AD7302 exports the control voltage adjusted as electricity of Ext_DA0, an other road DA exports the multiplexed voltage of Ext_DA1 as radio-frequency head AGC and front AGC, by multiplexing after a switch, by the control end signal of PTT signal as switch, PTT is the emissioning controling signal in whole radio station, when PTT is effective, radio station is in emission state, receiving and transmitting front end module work is in emission state, the DA of AD7302 exports Ext_DA1 and exports by switching gate to front AGC control end, when PTT is invalid, radio station is in accepting state, and receiving and transmitting front end module work is in accepting state, and the DA of AD7302 exports Ext_DA1 and exports by switching gate to radio frequency reception AGC control end.Remain conventional simulation AGC passage in circuit, analog-and digital-AGC passage is optional by a switch control rule, and the control end of switch is connected to an I/O pin of C8051F120 single-chip microcomputer, by control program according to command selection simultaneously.When being elected as digital AGC pattern, the voltage signal that radiofrequency signal converts to after wave detector, after amplifying, needs the sampling end sending into control chip C8051F120.The inner three place's agc circuits of receiving and transmitting front end have three road detecting circuits, and C8051F120 single-chip microcomputer only has the AD of two 8 passages, the situation of work when considering that transmitting-receiving path is different, by the multiplexing same sampling end AD0 of detecting circuit of front and radio frequency reception end.Influence each other between radio-frequency head detection employing and front detection are sampled, two-way detection sampled voltage is strobed into the different passages of AD0 by a switching over, PTT signal, as the control signal of diverter switch, is shown in Fig. 4.
Because in the present invention, digital control circuit part have employed digit chip C8051F120, in order to avoid interference, in the present invention, digital control circuit part single channel is designed on the independent circuits plate of a 58.4mm × 30.5mm, to be embedded in receiving and transmitting front end module independently in closed metal cavity by double 40 pin contact pin structures, effectively to shield the interference of digital circuit to analog channel.
In the present invention, when conversing for normal voice, receiving and transmitting front end inside adopts simulation AGC mode, AGC passage is simulated by control board program control receiving and transmitting front end internal switch gating, when for number arq mode, control board program control switch gated digital AGC passage, by digital AGC program control signal amplitude.According to PTT control signal, AGC control program judges that reiving/transmitting state calls transmitting-receiving AGC control program respectively.It is to suppress large-signal (signal higher than starting to control an amplitude) to cause LNA saturated that radio frequency reception end AGC controls, and does not need decay to small-signal, therefore only needs, receiving higher than when starting to control a some signal, to call radio-frequency head AGC control program.In order to make radio-frequency head AGC fast and stable, in control program, have employed look-up table, the corresponding relation between the control voltage of detecting circuit during large-signal and signal power corresponding relation, voltage-controlled attenuator and attenuation is made benchmark array respectively.During accepting state, radio-frequency head detecting circuit sampled value is mated with the element in benchmark array, find current signal power corresponding element subscript, again from the control voltage of voltage-controlled attenuator with search corresponding subscript element attenuation corresponding relation benchmark array and provide as voltage-controlled attenuator controlling value, can once the large-signal of radio-frequency head be controlled in preset range.The object that in two, AGC controls is stabilized in predetermined amplitude range by signal amplitude in two within the time allowed, and ensures that modulation /demodulation module can normal demodulation.In order to realize the object that fast A GC controls, in control algolithm, adopt approximation algorithm.A predetermined amplitude interval, detection sampling interval in corresponding one two, interval as stable amplitude, interval median is as fiducial value AD2_standard_value, the corresponding sampled value AD2_current_value of current amplitude, when AD2_current_value exceeds stable region, approximate calculation goes out controlling value AGC_value, and approximate formula is AGC_value=AGC_current_value+ (AD2_current_value-AD2_standard_value)/△ AD2_value × △ DA_value.(AGC_current_value represents when control DA value in the first two; The variable quantity of the intermediate frequency detection sampling that △ AD2_value is corresponding when being medium frequency amplitude change 1dBm; When △ DA_value represents that input is fixing, the variable quantity of controlling value corresponding during medium frequency amplitude change 1dBm).Before make a start AGC control object be in order to make front signalling amplitude stabilization regulation interval range in.In order to make front signalling amplitude reach stable state as early as possible, control algolithm adopts look-up table.When modulation /demodulation module sends carrier signal, when radio frequency output signal amplitude is 0dBm, DA controlling value Ext_DA1 corresponding to each frequency, as front DA controlling value array, when PTT control signal is effective, directly sends out the controlling value finding respective frequencies in DA controlling value array in the past and sends.Front sending out exports as corresponding detecting circuit sampled value during 0dBm is fiducial value, fluctuate 2dBm time corresponding detection sampled voltage interval be valid interval, when current detecting circuit sampled value exceeds valid interval, before adjusting according to the mode identical with AGC in two, send out DA controlling value.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; it should be pointed out that all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a high integration ultrashort wave radio set receiving and transmitting front end module, comprise power subsystem, digital control unit, crystal oscillator unit, frequently combine unit, front bill unit, rf receiver unit, electrically regulated filtering unit, AGC unit in mixing unit and two, it is characterized in that, in described rf receiver unit, two AGC unit and front bill unit simulation AGC path on set up digital AGC path.
2. a kind of high integration ultrashort wave radio set receiving and transmitting front end module according to claim 1, it is characterized in that, described digital AGC path comprises single-chip microcomputer and DA chip, the GPIO mouth of described single-chip microcomputer is connected with DA chip, a delivery outlet of this DA chip connects the voltage control port of electrically regulated filtering unit, another delivery outlet connects the AGC control port of rf receiver unit and the AGC control port of front bill unit respectively by a PTT Signal-controlled switch, described single-chip microcomputer two DA delivery outlets connect the two-stage voltage control port of AGC unit in two respectively, the detecting circuit delivery outlet of described rf receiver unit and front bill unit is connected to an AD input channel of single-chip microcomputer, in described two, the detecting circuit delivery outlet of AGC unit connects another AD input channel of single-chip microcomputer.
3. a kind of high integration ultrashort wave radio set receiving and transmitting front end module according to claim 2, it is characterized in that, described digital AGC path comprises four moulds/number AGC selector switch, and one is located at rf receiver unit, two are located at AGC unit in two, and last is located at front bill unit.
4. a kind of high integration ultrashort wave radio set receiving and transmitting front end module according to claim 2, it is characterized in that, the model of described single-chip microcomputer is C8051F120.
5. a kind of high integration ultrashort wave radio set receiving and transmitting front end module according to claim 2, it is characterized in that, the model of described DA chip is AD7302.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412766A (en) * | 2016-11-25 | 2017-02-15 | 西安烽火电子科技有限责任公司 | Shortwave signal amplitude automatic adjustment device and method |
| CN107948863A (en) * | 2017-12-29 | 2018-04-20 | 陕西烽火电子股份有限公司 | A kind of directional audio signal detection device and method based on FFT |
| CN109412619A (en) * | 2018-12-11 | 2019-03-01 | 中国电子科技集团公司第五十四研究所 | A kind of high neighboring trace inhibition radio-frequency transmitter |
-
2014
- 2014-11-28 CN CN201420735256.2U patent/CN204190761U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106412766A (en) * | 2016-11-25 | 2017-02-15 | 西安烽火电子科技有限责任公司 | Shortwave signal amplitude automatic adjustment device and method |
| CN106412766B (en) * | 2016-11-25 | 2019-11-22 | 西安烽火电子科技有限责任公司 | A kind of short-wave signal amplitude automatic regulating apparatus and method |
| CN107948863A (en) * | 2017-12-29 | 2018-04-20 | 陕西烽火电子股份有限公司 | A kind of directional audio signal detection device and method based on FFT |
| CN109412619A (en) * | 2018-12-11 | 2019-03-01 | 中国电子科技集团公司第五十四研究所 | A kind of high neighboring trace inhibition radio-frequency transmitter |
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