CN108521292A - Ultra-broadband digital satellite beacon method of reseptance based on software radio and receiver - Google Patents
Ultra-broadband digital satellite beacon method of reseptance based on software radio and receiver Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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Abstract
The invention discloses a kind of ultra-broadband digital satellite beacon method of reseptance and receiver based on software radio, including ultra-wide band radio-frequency front end and digital signal processing module that signal is interconnected, and the power module of power supply is provided for the two.Ultra-wide band radio-frequency front end includes variable gain amplifier, orthogonal mixer, local oscillator, the roads I amplifier, I path filters, the roads I ADC and the roads Q amplifier, Q path filters and the roads Q ADC.Digital signal processing module includes frequency computing module, power computation module and control interface module.It uses digital signal processing method and adaptive frequency adjusts and Gain tuning, carries out precise frequency and power calculation to satellite beacon signals, and output frequency and power information form antenna rotating platform driving instruction, complete to star process to antenna controller.Have the characteristics that ultra wide band work, dynamic range is big, integrated level is high, stable and reliable for performance, versatile.
Description
Technical field
The present invention relates to a kind of ultra-broadband digital satellite beacon receivers, and in particular to one kind being based on software and radio technique
Ultra-broadband digital satellite beacon method of reseptance and receiver, belong to technical field of satellite communication.
Background technology
With the continuous development of satellite technology, the features such as satellite communication is with its reliability height, good confidentiality, fast transmission speed
It is widely used in military affairs, news, fire-fighting, speedily carries out rescue work, the fields such as business, is designing and producing the manufacturer of satellite receiving terminal and equipment just
It shoots up like the mushrooms after rain so that the price of Satellite Communication Receive terminal and equipment constantly drops, and towards generalization, small
The directions such as type are developed.
Satellite beacon signals are satellite launchs, characterization satellite exists and its a kind of distinctive signal of correlated characteristic, it is adopted
With simple signal, foundation is provided for the search of satellite ground tracking telemetry and command station, measurement and tracking satellite.Satellite beacon receiver on ground
After receiving beacon signal, beacon signal is converted to the signal proportional to its watt level it is sent in antenna controller and formed
Antenna-steering instructions drive antenna rotating platform according to antenna-steering instructions so that antenna alignment satellite, to be better achieved to defending
The reception of star signal message.
It since satellite is in space environment, is influenced by various factors such as temperature, own beacon signal has certain frequency
Rate and amplitude shift, meanwhile, signal is in earthward transmission process, and by external environmental interference, beacon signal can be generated further
Frequency and amplitude convert, and the frequency and amplitude of the beacon signal that satellite beacon receiver receives on ground can be in a certain ranges
Interior dynamic change brings certain trouble to the accurate reception of beacon signal.
In order to effectively drive antenna alignment satellite, to obtain better reception, satellite beacon receiver is usually required that
In the case of muting sensitivity, large range of frequency and amplitude shift can be fought, and meet miniaturization, low work(as much as possible
The requirement of system design of consumption and low cost.In traditional satellite beacon receiver, usual way is using based on simulation side
The superhet phase lock loop locks of formula input beacon signal, to improve Signal-to-Noise, then obtain input letter using coherent demodulation
Number amplitude and error signal.But that there are equipment interoperability is poor for this method, lock speed is slow, equipment is more complex, debugging and system
Make the shortcomings such as difficult, cost is higher.
With the development of satellite technology, satellite frequency it is continuous broadening, other than traditional L-band, C-band, Ku wave bands,
Newly-increased Ka wave bands even Q-band satellite-signal, beacon signal by prime low-converter after amplifying down conversion process at this time, intermediate frequency
Signal frequency covering will be from traditional L-band（That is 0.95~2.15GHz）Substantially expand to 0.95~4.2GHz ultra wide band ranges.
It is typically in simulation process although current digital processing technology is partly introduced into the development of satellite beacon receiver
Numerically controlled method is used on the basis of mode, or adds digital processing part in the rearmost end of simulation process.Due to
Its radio-frequency front-end still uses analog form to handle, and processing frequency range is limited, causes performance still relatively low, it is difficult to meet satellite
The development need of communication engineering generalization, miniaturization is unfavorable for being widely used on a large scale.Therefore, a kind of ultra wide band, complete is developed
Covering, the good digital satellite beacon receiver that dynamic range is big, good just become the present invention and want to solve the problems, such as.
Invention content
In view of above-mentioned existing situation and deficiency, the present invention proposes that a kind of ultra-broadband digital based on software and radio technique is defended
Star beacon reception method and receiver, using the radio-frequency front-end under radiotechnics and digital information control to receive compared with
Wide range of frequencies and the satellite beacon signals of amplitude shift are digitized processing, and carry out letter using digital signal processing module
The accurate calculating and gain control of number frequency and power, are finally completed the number of satellite beacon signals power and frequency accurate information
Change output, to realize that satellite antenna turning table control provides accurate foundation.
On specific framework, as shown in Figure 1, the present invention is by based on the ultra-wide band radio-frequency front end of software radio framework, number
Word signal processing module and power module three parts constitute digital satellite beacon receiver, and in the coordination of extraneous antenna controller
Under control, the angle of co-ordination and antenna rotating platform controls between completing each section.
Ultra-wide band radio-frequency front end uses software radio framework, according to preset bandwidth and gain information, by what is received
Satellite beacon signals are amplified, filter, and are finally down-converted to zero intermediate frequency signals, and be digitized processing by ADC, output
Into back-end digital signal processing module.Software radio uses zero intermediate frequency band logical sampling software radio, has radio circuit
Simply, bandwidth of operation is wide, signal is the advantages of receiving channel is not easy to be distorted.Digitized processing later makes the structure to waveform
Better adaptability.Zero intermediate frequency software radio ultra-wide band radio-frequency front end is a highly integrated general radio frequency receiver, can
For receiving RF signals and being amplified the digital signal for being converted into using for base band, as shown in Fig. 2, specifically including variable increasing
Beneficial amplifier, orthogonal mixer, local oscillator, the roads I amplifier, the roads Q amplifier, I path filters, Q path filters, the roads I ADC and the roads Q
ADC.Wherein signal is amplified by variable gain amplifier, is mixed with local oscillation signal through orthogonal mixer, after amplification
Signal down is zero intermediate frequency signals, and is decomposed into I, Q two-way, and subsequent I, Q two paths of signals passes through the roads I amplifier respectively, the roads Q are amplified
Device is amplified, and is filtered amplified I, Q signal subsequently into I path filters, Q path filters, will be mingled in signal
In high-frequency interferencing signal filter out, final I, Q signal carry out digital sample by the roads I ADC and the roads Q ADC respectively, are output to rear end
In digital signal processing module.Since the bandwidth of variable gain amplifier and local oscillator is very wide, wide operating frequency range ensure that,
Simultaneously as amplifier, ADC, filter are digital configuration mode, big frequency drift has been effectively ensured in wide adaptation range
It is used under range and high dynamic range.
Digital signal processing module specifically includes frequency computing module, power computation module and control interface module.Such as Fig. 3
Shown, digital signal processing module obtains the accurate frequency of input signal by internal frequency computing module and power computation module
Rate information and power information, by carrying out the gain-adjusted of prime ultra-wide band radio-frequency front end to the power signal being calculated, from
And improve the dynamic range of receiver.Under the coordination of control interface module, on the one hand digital signal processing module can be sent
On the other hand the power being calculated and frequency information can be output to a day line traffic control by frequency, gain control and adjust instruction
Device forms corresponding antenna-steering instructions driving antenna rotating platform, completes antenna and accurately track satellite process.
Wherein, frequency computing module obtains the spectrum information of stable input signal based on Fast Fourier Transform (FFT),
And then obtain the frequency information of input beacon signal.To ensure the accuracy of antenna receives frequency, which employs " adaptive bandwidths
Technology ", specifically, it is initial to star in the case of a wide range of initial frequency deviation to ensure, utilize software radio ultra-wide band radio-frequency
The reconfigurable feature of the filtering parameter of front end, intermediate frequency filtering bandwidth is arranged most wide, is convenient for extensive search beacon signal.
After searching beacon signal, intermediate-frequency bandwidth setting is narrowed, then ADC sample frequencys are reduced, signal processing bandwidth becomes at this time
Narrow, the signal frequency and range signal of module output are more accurate.Power computation module is according to the calculating of Fast Fourier Transform (FFT)
As a result, carrying out performance number and signal-to-noise ratio computation, works under optimum state based on ultra-wide band radio-frequency front end, finally obtain amplitude most
Specific performance number corresponding to big value Frequency point and signal-to-noise ratio realize the power information transmission of outwardly antenna controller.
To expand the dynamic range of receiver, " adaptive gain treatment technology " is used in power computation module, specifically
For, power computation module adjusts the increasing of variable gain amplifier in ultra-wide band radio-frequency front end according to the performance number being calculated
Benefit, judges whether ultra-wide band radio-frequency front-end gain meets the requirements.When power is excessive or too small, power computation module passes through control
The adjustment order of interface module output gain, Gain tuning is carried out to ultra-wide band radio-frequency front end, so that the signal power of output is met and is wanted
The problems such as asking, preventing I, Q digital output signal intensity saturation or too small intensity, both can be to avoid signal strength is too big and goes out
Existing harmonic wave, but can avoid signal strength it is too small and the problems such as can not detect, to improve the dynamic of whole satellite beacon receiver
State range.
The effect of control interface module is：On the one hand frequency, the gain preset instruction for receiving extraneous antenna controller, are completed
Frequency, gain preset instruction and later stage adjust instruction and frequency and power information are at ultra-wide band radio-frequency front end and digital signal
The transmission between module is managed, on the other hand the power being calculated and frequency information can be output to extraneous antenna controller
In, it forms antenna-steering instructions and drives antenna rotating platform, complete antenna tracking satellite process.
Power module is connected with above-mentioned module, and stable DC source is provided for above-mentioned modules.
The present invention is achieved through the following technical solutions：
Ultra-broadband digital satellite beacon method of reseptance based on software radio, specific steps include：
Step 1: frequency of the antenna controller according to satellite beacon signals to be received, through digital signal processing module to ultra wide band
Radio-frequency front-end sends out frequency, gain preset instruction, the receives frequency of ultra-wide band radio-frequency front end is predisposed to beacon frequency, bandwidth is set
It is set to most wide, gain is set as maximum.
Step 2: ultra-wide band radio-frequency front end receives the input of the intermediate frequency after LNB down coversions in the frequency range of setting
Signal is digitized processing by ADC, finally exports after being amplified, filter by signal, being down-converted to zero intermediate frequency signals
To digital signal processing module.
Step 3: the frequency computing module in digital signal processing module believes the number received by internal software
Number carry out Fast Fourier Transform (FFT), obtain receive signal digital spectrum, meanwhile, calculate signal digital spectrum in Amplitude maxima
The corresponding specific frequency values of Frequency point, are sent collectively in power computation module, power computation module passes through internal software meter
Calculate the corresponding specific performance number of Amplitude maxima Frequency point and signal-to-noise ratio in receiving signal digital frequency spectrum.
Step 4: as power computation module judges signal-to-noise ratio >=6dB, then represents and searched beacon signal, number letter
Number processing module is transferred to locking mode；Otherwise, return to step two continues search for.
Step 5: frequency computing module sends out frequency adjust instruction by control interface module to radio-frequency front-end, reduce super
The frequency bandwidth of broadband rf front end and the sample frequency of ADC, then, frequency computing module is most freshly harvested according to radio-frequency front-end
Signal recalculates the inscribed digital spectrum collected mail number of locked frequency band, meanwhile, recalculate in signal digital spectrum amplitude most
Specific frequency values corresponding to big value Frequency point, and be sent collectively in power computation module, power computation module to connecing again
The corresponding specific performance number of Amplitude maxima Frequency point and signal-to-noise ratio are calculated in the signal digital spectrum received.
Step 6: as calculated performance number has been saturated, that is, exceed the maximum processing range value of radio-frequency front-end A/D module,
Then power computation module sends Gain tuning instruction by control interface module, is adjusted to the gain of ultra-wide band radio-frequency front end
It is whole, until finding a suitable gain voltage value, ultra-wide band radio-frequency front end is made to be operated in optimum state, then, power calculation
Module recalculates after adjustment in radio-frequency front-end signal digital spectrum in locked frequency band corresponding to Amplitude maxima Frequency point
Specific performance number and signal-to-noise ratio.
Step 7: as power computation module judges signal-to-noise ratio >=10dB, then the quality for representing locking signal is met the requirements, control
Interface module processed exports frequency values in locked frequency band corresponding to Amplitude maxima Frequency point and power value information to extraneous day
Lane controller, otherwise, return to step two re-search for signal.
In the step 2, input signal carries out signal amplification by the variable gain amplifier in ultra-wide band radio-frequency front end,
It is mixed by orthogonal mixer and local oscillation signal, to be decomposed into I, Q two-way after zero intermediate frequency signals, I, Q two paths of signals divide for frequency reducing
Not Jing Guo the roads I amplifier and the roads Q amplifier amplification, filtered respectively through I path filters and Q path filters, then pass through the roads I ADC
Digital sample is carried out respectively with the roads Q ADC, is finally output in digital signal processing module.
In the step 5, frequency adjustment mode is that frequency bandwidth is reduced to the signal digital spectrum amplitude being calculated
5~8 times of frequency values corresponding to maximum value Frequency point, ADC sample frequencys are reduced to that signal digital spectrum amplitude is calculated
10~16 times of frequency values corresponding to maximum value Frequency point.
In the step 6, Gain tuning mode is to press grade from high to low to carry out Gain tuning, first selects highest-gain, searches
Rope and after tracing into signal, if signal amplitude is excessive, reduces gain successively.Every grade of gain adjustment range is 10dB.
Receiver made of a kind of ultra-broadband digital satellite beacon method of reseptance based on above-mentioned software radio, including letter
Number interconnected ultra-wide band radio-frequency front end and digital signal processing module, and the power module of power supply is provided for the two；It is super
Broadband rf front end includes the variable gain amplifier of signal communication and orthogonal mixer and is connected on orthogonal mixer
Local oscillator further includes the roads I amplifier, I path filters and the roads the I ADC being connected on all the way on orthogonal mixer output end and another
Road is connected on the roads Q amplifier, Q path filters and the roads Q ADC on orthogonal mixer output end；Digital signal processing module includes
The frequency computing module of sequential communication, power computation module, and be connected respectively with frequency computing module, power computation module
Control interface module；Variable gain amplifier receives the gain preset or adjust instruction that digital signal processing module is sent, docking
Intermediate-freuqncy signal after the input down coversion received carries out variable gain amplification；Local oscillator receives the frequency that digital signal processing module is sent
Rate is preset or adjust instruction, is mixed to the intermediate-freuqncy signal after the input down coversion that receives together with orthogonal mixer, will
The further frequency reducing of output signal of variable gain amplifier is zero intermediate frequency signals, and is decomposed into I, Q two-way；The roads I amplifier, the roads I
Filter, the roads I ADC and the roads Q amplifier, Q path filters, the roads the I signal of the roads Q ADC difference quadrature mixers outputs and the roads Q
Signal is amplified, filters and digital sampling processing, and exports in I, Q two-way digital information to digital signal processing module；Frequently
Rate computing module is obtained the digital spectrum for receiving signal, is calculated width in signal digital spectrum based on Fast Fourier Transform (FFT)
The specific frequency values corresponding to maximum value Frequency point are spent, are sent collectively in power computation module, and pass through control interface module
Frequency adjust instruction is sent out to ultra-wide band radio-frequency front end；Power computation module calculates in the signal digital spectrum that receives amplitude most
Specific performance number corresponding to big value Frequency point and signal-to-noise ratio judge whether performance number is saturated and whether signal-to-noise ratio meets and want
It asks, and Gain tuning instruction is sent out to ultra-wide band radio-frequency front end by control interface module；Control interface module is responsible for digital letter
Information transmission between number processing module and ultra-wide band radio-frequency front end and extraneous antenna controller.
The beneficial effect of ultra-broadband digital satellite beacon method of reseptance and receiver of the present invention based on software radio
Fruit includes：
1, precise frequency and power calculation are carried out to satellite beacon signals using digital signal processing method, and is output to a day line traffic control
Device processed forms antenna-steering instructions and drives antenna rotating platform, enables the antenna to be accurately aimed at satellite.
2, ultra-wide band radio-frequency front end and digital signal processing module can be in the monolithic software wireless electrical chips of high integration
It is realized on digital signal processing chip, so that the receiver is had, ultra wide band work, dynamic range is big, integrated level is high, performance is steady
The features such as fixed reliable, versatile.
3, " adaptive frequency calculating " and " adaptive gain control " two skills have been used in digital signal processing module
Art, can accurate frequency test signal and accurate test signal power, enable a system to the variation of signal input power very greatly,
Within the scope of big frequency drift, satellite beacon signals are accurately tracked.
4, show that the present invention can accurately capture maximum within the scope of 70MHz~6000MHz by test
Frequency drift reaches scholar 1000kHz, and amplitude transformation range is in the beacon signal of -100dBm~-5OdBm, and it is accurate to pass through digital form
True ground output power value greatly exceeds the precision and performance for having beacon receiver on the market.
Description of the drawings
Fig. 1 is the structure of the ultra-broadband digital satellite beacon receiver use state of the present invention based on software radio
Schematic block diagram；
Fig. 2 is the structure diagram of the ultra-wide band radio-frequency front end；
Fig. 3 is the structure diagram of the digital signal processing module.
Specific implementation mode
The present embodiment is being implemented down based on the technical solution of the present invention, gives detailed embodiment and specific
Operating process, but protection scope of the present invention is not limited to following embodiments.
Below in conjunction with the accompanying drawings 1, Fig. 2, Fig. 3 connect the ultra-broadband digital satellite beacon of the present invention based on software radio
Receiving method and receiver are described in further detail：
Ultra-broadband digital satellite beacon method of reseptance of the present invention based on software radio, specific steps include：
Step 1: frequency of the antenna controller according to satellite beacon signals to be received, through digital signal processing module to ultra wide band
Radio-frequency front-end sends out frequency, gain preset instruction, the receives frequency of ultra-wide band radio-frequency front end is predisposed to beacon frequency, bandwidth is set
It is set to most wide, gain is set as maximum.
Step 2: ultra-wide band radio-frequency front end receives the input of the intermediate frequency after LNB down coversions in the frequency range of setting
Signal is digitized processing by ADC, finally exports after being amplified, filter by signal, being down-converted to zero intermediate frequency signals
To digital signal processing module.Wherein, input signal is put by the variable gain amplifier progress signal in ultra-wide band radio-frequency front end
Greatly, be mixed by orthogonal mixer and local oscillation signal, frequency reducing be zero intermediate frequency signals after be decomposed into I, Q two-way, I, Q two paths of signals
Pass through the roads I amplifier respectively and the roads Q amplifier amplifies, is filtered respectively through I path filters and Q path filters, then pass through the roads I
The roads ADC and Q ADC carries out digital sample respectively, is finally output in digital signal processing module.
Step 3: the frequency computing module in digital signal processing module believes the number received by internal software
Number carry out Fast Fourier Transform (FFT), obtain receive signal digital spectrum, meanwhile, calculate signal digital spectrum in Amplitude maxima
The corresponding specific frequency values of Frequency point, and be sent collectively in power computation module, power computation module passes through internal software
Calculate the corresponding specific performance number of Amplitude maxima Frequency point and signal-to-noise ratio in receiving signal digital frequency spectrum.
Star is initially searched in this example, filtering bandwidth is selected as 5MHz, and AD sample rates are 5Msps, Fourier transform
Points are 4096 points, and respective frequencies resolution ratio is 2.4kHz.
Step 4: as power computation module judges signal-to-noise ratio >=6dB, then represents and searched beacon signal, number letter
Number processing module is transferred to locking mode；Otherwise, return to step two continues search for.
Step 5: frequency computing module sends out frequency adjust instruction by control interface module to radio-frequency front-end, reduce super
The frequency bandwidth of broadband rf front end and the sample frequency of ADC, then, frequency computing module is most freshly harvested according to radio-frequency front-end
Signal recalculates the inscribed digital spectrum collected mail number of locked frequency band, meanwhile, recalculate in signal digital spectrum amplitude most
Specific frequency values corresponding to big value Frequency point, and be sent collectively in power computation module, power computation module to connecing again
The corresponding specific performance number of Amplitude maxima Frequency point and signal-to-noise ratio are calculated in the signal digital spectrum received.Wherein, frequency
Rate adjustment mode is the frequency being reduced to frequency bandwidth corresponding to the signal digital spectrum Amplitude maxima Frequency point being calculated
5~8 times of rate value, ADC sample frequencys are reduced to that the frequency corresponding to signal digital spectrum Amplitude maxima Frequency point is calculated
10~16 times of rate value.
In this example, the frequency values corresponding to the signal digital spectrum Amplitude maxima Frequency point being calculated will filter
Bandwidth selection is 2.5MHz, and AD sample rates are 2.5Msps, and the points of Fourier transformation are 4096 points, it is ensured that 0.6kHz's
Frequency resolution.It, can also be right in order to eliminate the influence for modulating spuious information and extraneous environmental noise of satellite beacon signals itself
The result of Fast Fourier Transform (FFT) is filtered operation, that is, filtering bandwidth is used to be obtained newest for the Finite Impulse Response filter of 40Hz
Acquire the frequency spectrum and amplitude information of signal.
Step 6: as calculated performance number has been saturated, that is, exceed the maximum processing range value of radio-frequency front-end A/D module,
Then power computation module sends Gain tuning instruction by control interface module, is adjusted to the gain of ultra-wide band radio-frequency front end
It is whole, until finding a suitable gain voltage value, ultra-wide band radio-frequency front end is made to be operated in optimum state, then, power calculation
Module recalculates after adjustment in radio-frequency front-end signal digital spectrum in locked frequency band corresponding to Amplitude maxima Frequency point
Specific performance number and signal-to-noise ratio.Wherein, Gain tuning mode is to press grade from high to low to carry out Gain tuning, first highest is selected to increase
Benefit after searching for and tracing into signal, if signal amplitude is excessive, reduces gain, every grade of gain adjustment range is successively
10dB。
In this example, selects 5 grades according to the gain interval of 10dB and carry out adaptive yield value adjustment, from high to low, until
A suitable gain voltage value is found, the requirement that ultra-wide band radio-frequency front end signal is operated in optimum state is met.
Step 7: as power computation module judges signal-to-noise ratio >=10dB, then the quality for representing locking signal is met the requirements, control
Interface module processed exports frequency values in locked frequency band corresponding to Amplitude maxima Frequency point and power value information to extraneous day
Lane controller, otherwise, return to step two re-search for signal.
Frequency values in extraneous antenna controller and power value information are fed back to after antenna controller is handled, forms antenna
The control parameter of turntable completes the control of antenna rotating platform orientation, realize antenna to star process.
Ultra-broadband digital satellite beacon receiver of the present invention based on software radio, including signal are interconnected
Ultra-wide band radio-frequency front end and digital signal processing module, and provide for the two the power module of power supply.Before ultra-wide band radio-frequency
End includes the variable gain amplifier and orthogonal mixer and the local oscillator that is connected on orthogonal mixer of signal communication, further includes
The roads I amplifier, I path filters and the roads the I ADC and another way being connected on all the way on orthogonal mixer output end are connected on just
Hand over the roads Q amplifier, Q path filters and the roads the Q ADC on mixer output.Digital signal processing module includes sequential communication
Frequency computing module, power computation module, and the control interface mould that is connected respectively with frequency computing module, power computation module
Block.
After it is intermediate-freuqncy signal that extraneous satellite beacon signals are downconverted, variable gain amplifier receives control interface first
The gain preset instruction that module is sent, carries out variable gain amplification, then to the intermediate-freuqncy signal after the extraneous down coversion that receives
It is mixed with local oscillation signal through orthogonal mixer, is zero intermediate frequency signals by variable gain amplified signal frequency reducing, and be decomposed into I, Q
Two-way, the roads I amplifier, I path filters and the roads I ADC be amplified the roads I signal, filters and digitized processing, meanwhile, Q is put on road
Big device, Q path filters and the roads Q ADC be respectively amplified the roads Q signal, filters and digitized processing, and exports two way of I, Q
In word information to frequency computing module；Then, frequency computing module is based on Fast Fourier Transform (FFT), in conjunction with being filtered,
The digital spectrum for obtaining receiving signal calculates the specific frequency values corresponding to Amplitude maxima Frequency point in signal digital spectrum,
And be sent collectively in power computation module, power computation module calculates Amplitude maxima frequency in the signal digital spectrum received
Specific performance number corresponding to rate point and signal-to-noise ratio judge whether signal-to-noise ratio meets the requirements and whether performance number is saturated, accordingly
Adaptive frequency adjust instruction or Gain tuning instruction are sent out to ultra-wide band radio-frequency front end by control interface module, it is so past
It is multiple, until the signal-tonoise information being calculated is met the requirements, finally, corresponding to the Amplitude maxima Frequency point being calculated
Specific frequency information and power information are transmitted to by control interface module in extraneous antenna controller, and antenna controller controls day
Line turntable carries out position adjustment, completes antenna to star process.
Embodiment one
Ultra-broadband digital satellite beacon receiver based on software radio, including:Ultra-wide band radio-frequency based on software radio
Front-end chip AD9361, digital signal processing module chip ZYNQ7010 and power module.
The frequency control that ultra-wide band radio-frequency front-end chip AD9361 is fed back according to digital signal processing module chip ZYNQ7010
System and power control information, the intermediate-freuqncy signal of input are amplified, and be down-converted to the zero of 0-30MHz by orthogonal mixer
Intermediate frequency I, Q signal are output to low-pass filter, and carry out high-speed AD processing, so as to back-end digital signal processing module chip work
Make.Digital signal processing module chip has frequency meter using chip ZYNQ7010, the ZYNQ7010 built-in chip type of XILINX companies
Calculate module, power computation module and control interface module.The clock frequency of ZYNQ7010 is 1GHz, utilizes built-in hardware multiplication
Device, the arithmetic speed to improving signal frequency and power calculation has very big help, in addition, being integrated with serial transmission bus in chip
The interfaces such as I2C, serial device interfaces SPI, and the ADC module of built-in 12bit sampling precisions, are not only easy to use, also effectively
Hardware cost is reduced, Function Extension is more convenient.AD9361 allows the gain ranging of 75dB, is selected according to the gain interval of 15dB
Go out 5 typical yield values.When initial progress signal lookup, high-gain is first selected, after searching and tracing into signal, if signal
Amplitude is excessive, then reduces chip gain successively, is to require to find to meet ultra-wide band radio-frequency front end signal to be operated in optimum state
One suitable gain voltage value.Power module provides the DC power supply of high stable for each module.Wherein, provide for AD9361+
3.3V ,+1.8V DC power supply provide+1.8V ,+3.3V DC power supply for digital signal processing module.
In this example, ultra-wide band radio-frequency front-end chip, digital signal processing module chip and power module are integrated in one block of electricity
On the plate of road, circuit board uses 10 layers of printed board of 110 × 80mm2, and top layer and bottom are signals layer, meanwhile, also walk part
Power and ground.Wherein, radio frequency analog part only needs an AD9361 chip, and other main signal processing works are in number
It is realized in signal processing module chip ZYNQ7010.The cost and debugging difficulty of system are not only reduced, and with very high
Level of integrated system, ensure that the performance of system, increase the reliability and versatility of system.
Claims (6)
1. the ultra-broadband digital satellite beacon method of reseptance based on software radio, which is characterized in that specific steps include：
Step 1: frequency of the antenna controller according to satellite beacon signals to be received, through digital signal processing module to ultra wide band
Radio-frequency front-end sends out frequency, gain preset instruction, the receives frequency of ultra-wide band radio-frequency front end is predisposed to beacon frequency, bandwidth is set
It is set to most wide, gain is set as maximum；
Step 2: ultra-wide band radio-frequency front end receives the IF input signals after LNB down coversions in the frequency range of setting,
After signal is amplified, is filtered, being down-converted to zero intermediate frequency signals, processing is digitized by ADC, is finally output to number
Signal processing module；
Step 3: frequency computing module in digital signal processing module by internal software to the digital signal that receives into
Row Fast Fourier Transform (FFT) obtains the digital spectrum for receiving signal, meanwhile, calculate Amplitude maxima frequency in signal digital spectrum
The corresponding specific frequency values of point, are sent collectively in power computation module, and power computation module is connect by internal software calculating
The corresponding specific performance number of Amplitude maxima Frequency point and signal-to-noise ratio in collection of letters digital spectrum；
Step 4: as power computation module judges signal-to-noise ratio >=6dB, then represents and searched beacon signal, at digital signal
Reason module is transferred to locking mode；Otherwise, return to step two continues search for；
Step 5: frequency computing module sends out frequency adjust instruction by control interface module to radio-frequency front-end, ultra wide band is reduced
The frequency bandwidth of radio-frequency front-end and the sample frequency of ADC, then, frequency computing module is according to the most freshly harvested letter of radio-frequency front-end
Number, the digital spectrum of the inscribed collection of letters number of locked frequency band is recalculated, meanwhile, it is maximum to recalculate amplitude in signal digital spectrum
It is worth the specific frequency values corresponding to Frequency point, and is sent collectively in power computation module, power computation module to receives again
To signal digital spectrum in the corresponding specific performance number of Amplitude maxima Frequency point and signal-to-noise ratio calculated；
Step 6: as calculated performance number has been saturated, that is, exceed the maximum processing range value of radio-frequency front-end A/D module, then work(
Rate computing module sends Gain tuning instruction by control interface module, is adjusted to the gain of ultra-wide band radio-frequency front end, directly
To a suitable gain voltage value is found, ultra-wide band radio-frequency front end is made to be operated in optimum state, then, power computation module weight
Specific work(after new calculating adjustment in radio-frequency front-end signal digital spectrum in locked frequency band corresponding to Amplitude maxima Frequency point
Rate value and signal-to-noise ratio；
Step 7: as power computation module judges signal-to-noise ratio >=10dB, then the quality for representing locking signal is met the requirements, and control connects
Mouth mold block exports frequency values in locked frequency band corresponding to Amplitude maxima Frequency point and power value information to extraneous day line traffic control
Device processed, otherwise, return to step two re-search for signal.
2. the ultra-broadband digital satellite beacon method of reseptance according to claim 1 based on software radio, feature exist
In in the step 2, input signal carries out signal amplification by the variable gain amplifier in ultra-wide band radio-frequency front end, by orthogonal
Frequency mixer and local oscillation signal are mixed, and to be decomposed into I, Q two-way after zero intermediate frequency signals, I, Q two paths of signals pass through I respectively for frequency reducing
Road amplifier and the amplification of the roads Q amplifier, filter through I path filters and Q path filters, then pass through the roads I ADC and the roads Q ADC respectively
Digital sample is carried out respectively, is finally output in digital signal processing module.
3. the ultra-broadband digital satellite beacon method of reseptance according to claim 1 based on software radio, feature exist
In in the step 5, frequency adjustment mode is that frequency bandwidth is reduced to the signal digital spectrum amplitude maximum being calculated
It is worth 5~8 times of the frequency values corresponding to Frequency point, ADC sample frequencys are reduced to that signal digital spectrum amplitude maximum is calculated
It is worth 10~16 times of the frequency values corresponding to Frequency point.
4. the ultra-broadband digital satellite beacon method of reseptance according to claim 1 based on software radio, feature exist
In in the step 6, Gain tuning mode is to press grade from high to low to carry out Gain tuning, first selects highest-gain, search is simultaneously
After tracing into signal, if signal amplitude is excessive, gain is reduced successively.
5. the ultra-broadband digital satellite beacon method of reseptance according to claim 4 based on software radio, feature exist
In every grade of gain adjustment range is 10dB.
6. a kind of ultra-broadband digital satellite beacon method of reseptance according to based on software radio described in the claims 1 is made
Receiver, which is characterized in that including signal be interconnected ultra-wide band radio-frequency front end and digital signal processing module, Yi Jiwei
The two provides the power module of power supply；
The ultra-wide band radio-frequency front end includes the variable gain amplifier of signal communication and orthogonal mixer and is connected to orthogonal
Local oscillator on frequency mixer further includes the roads I amplifier, I path filters and the roads I being connected on all the way on orthogonal mixer output end
ADC and another way are connected on the roads Q amplifier, Q path filters and the roads Q ADC on orthogonal mixer output end；
The digital signal processing module includes the frequency computing module of sequential communication, power computation module, and respectively with frequency
The connected control interface module of rate computing module, power computation module；
The variable gain amplifier receives the gain preset or adjust instruction that digital signal processing module is sent, to what is received
The intermediate-freuqncy signal inputted after down coversion carries out variable gain amplification；
The local oscillator receives the frequency preset or adjust instruction that digital signal processing module is sent, and is docked together with orthogonal mixer
Intermediate-freuqncy signal after the input down coversion received is mixed, and is zero by the further frequency reducing of the output signal of variable gain amplifier
Intermediate-freuqncy signal, and it is decomposed into I, Q two-way；
The roads I amplifier, I path filters, the roads I ADC and the roads Q amplifier, Q path filters, the roads Q ADC are respectively to orthogonal mixed
The roads the I signal and the roads Q signal of frequency device output be amplified, filters and digital sampling processing, and exports I, Q two-way digital information and arrive
In digital signal processing module；
The frequency computing module is obtained the digital spectrum for receiving signal, is calculated signal number based on Fast Fourier Transform (FFT)
Specific frequency values in word frequency spectrum corresponding to Amplitude maxima Frequency point, are sent collectively in power computation module, and pass through control
Interface module processed sends out frequency adjust instruction to ultra-wide band radio-frequency front end；
The power computation module calculates the specific work(corresponding to Amplitude maxima Frequency point in the signal digital spectrum received
Rate value and signal-to-noise ratio judge whether performance number is saturated and whether signal-to-noise ratio meets the requirements, and by control interface module to super
Broadband rf front end sends out Gain tuning instruction；
The control interface module be responsible for digital signal processing module and ultra-wide band radio-frequency front end and extraneous antenna controller it
Between information transmission.
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