CN105974387B - A kind of signal gain control method and device - Google Patents
A kind of signal gain control method and device Download PDFInfo
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- CN105974387B CN105974387B CN201610320339.9A CN201610320339A CN105974387B CN 105974387 B CN105974387 B CN 105974387B CN 201610320339 A CN201610320339 A CN 201610320339A CN 105974387 B CN105974387 B CN 105974387B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The embodiment of the invention discloses a kind of signal gain control method and device, the first signal that will acquire carries out analog to digital conversion, Digital Signal Processing, obtains second signal；The second signal is subjected to interlacing amplitude statistics, determines interlacing amplitude statistics mean value；According to the interlacing amplitude statistics mean value and pre-determined threshold, gain control code is determined, gain control is carried out to signal according to the gain control code.Signal gain control method provided in an embodiment of the present invention and device can improve system remote sensing sensitivity with the gain of automatic regulating system receives link signal.
Description
Technical field
The present invention relates to the multi polarized SAR SAR technology in spaceborne field more particularly to a kind of signal gain controls
Method and apparatus processed.
Background technique
Multi polarized SAR (SAR, Synthetic Aperture Radar) passes through transmitting/reception not same polarization
Electromagnetic signal acquisition is more more abundant than single polarization SAR to be observed terrestrial object information.Multipolarization SAR system can use bis- (polarization)
Channel emission, four (polarization) channel reception modes theoretically receive perfact polarization information simultaneously, wherein two parallel launch channels
Emit H, V polarized pulse signal respectively, four parallel receiving channels receive tetra- kinds of polarized signals of HH, HV, VH, VV respectively.In order to
The complexity of reduction system cost of implementation and equipment, spaceborne multipolarization SAR system generally pass through single transmission channel cross fire two
Kind polarization pulse (H polarization pulse and V polarization pulse), the double reception channel including H polarization reception channel and V polarization reception channel
Realize quasi- four polarization informations of acquisition simultaneously.In multipolarization SAR system, the cross polarization echo received not co polar signal amplitude
With significant difference, accordingly, it is desirable to provide a kind of gain control method for adapting to this reception signal amplitude alternating variation characteristic.
Summary of the invention
In order to solve the above technical problems, the embodiment of the present invention provides a kind of signal gain control method and device, can from
The gain of dynamic regulating system receives link signal, improves system remote sensing sensitivity.
The technical scheme of the present invention is realized as follows:
The embodiment of the present invention provides a kind of signal gain control method, which comprises
The first signal that will acquire carries out analog to digital conversion, Digital Signal Processing, obtains second signal；
The second signal is subjected to interlacing amplitude statistics, determines interlacing amplitude statistics mean value；
According to the interlacing amplitude statistics mean value and pre-determined threshold, gain control code is determined, according to the gain control code
Gain control is carried out to signal.
Further, described that the second signal is subjected to interlacing amplitude statistics, it determines interlacing amplitude statistics mean value, wraps
It includes:
The second signal is subjected to the cumulative summation of interlacing piecemeal, determines interlacing amplitude statistics mean value.
Further, described that the second signal is subjected to the cumulative summation of interlacing piecemeal, determine interlacing amplitude statistics mean value,
Include:
Distance is set to the deblocking parameter with orientation；
After receiving pulse signal, the frame data of the second signal are obtained, the pulse signal instruction starts to obtain
Frame data；
The frame data for the second signal that will acquire carry out first and add up, until the first accumulation distance is big to data amount check
In pre-determined distance to deblocking parameter when, the number of pulse signal judges whether the frame data are odd number based on the received
Frame；
When the frame data are odd-numbered frames, odd-numbered frame progress interlacing second is added up in orientation, until second
Cumulative Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, second accumulated value is the interlacing amplitude
Average statistical；
When the frame data are even frames, even frame progress interlacing third is added up in orientation, until third
Cumulative Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, the third accumulated value is the interlacing amplitude
Average statistical.
Further, described according to the interlacing amplitude statistics mean value and pre-determined threshold, determine gain control code, comprising:
The interlacing amplitude statistics mean value is compared with pre-determined threshold；
When the interlacing amplitude statistics mean value is greater than the upper limit value of pre-determined threshold, preset gain control code is increased by first
Preset value obtains the gain control code；
When the interlacing amplitude statistics mean value is less than the lower limit value of pre-determined threshold, preset gain control code is reduced second
Preset value obtains the gain control code；
When the interlacing amplitude statistics mean value is less than or equal to the upper limit value of pre-determined threshold, and the interlacing amplitude statistics mean value
More than or equal to pre-determined threshold lower limit value when, keep preset gain control code it is constant, the preset gain control code be the increasing
Beneficial control code.
Further, analog to digital conversion, Digital Signal Processing are carried out in first signal that will acquire, obtains second signal
Before, further includes:
Receive synthetic aperture radar SAR echo signal；
The SAR echo signal is subjected to the first signal processing, obtains the first signal.
Further, described that the SAR echo signal is subjected to the first signal processing, obtain the first signal, comprising:
The SAR echo signal is amplified, down coversion, filtering processing, obtain the first signal, first signal is
Intermediate-freuqncy signal；
Alternatively,
The SAR echo signal is amplified, down coversion, filtering, quadrature demodulation processing, obtains the first signal, it is described
First signal includes: the road I signal or the road Q signal；
Alternatively,
The SAR echo signal is amplified, is filtered, the first signal is obtained, first signal is radio frequency letter
Number.
The embodiment of the present invention provides a kind of signal gain control device, described device include: processing unit, determination unit,
Control unit, wherein
The processing unit, the first signal for will acquire carry out analog to digital conversion, Digital Signal Processing, obtain the second letter
Number；
The determination unit determines interlacing amplitude statistics mean value for the second signal to be carried out interlacing amplitude statistics；
It is also used to determine gain control code according to the interlacing amplitude statistics mean value and pre-determined threshold；
Described control unit, for carrying out gain control to signal according to the gain control code.
Further, the determination unit is specifically used for carrying out the second signal into the cumulative summation of interlacing piecemeal, determine
Interlacing amplitude statistics mean value.
Further, the determination unit includes: setup module, obtains module, accumulator module,
The setup module, for distance to be arranged to the deblocking parameter with orientation；
The acquisition module, for after receiving pulse signal, obtaining the frame data of the second signal, the pulse
Signal designation starts to obtain frame data；
The accumulator module, the frame data of the second signal for will acquire carry out it is first cumulative, until first tired
Add distance to data amount check be greater than pre-determined distance to deblocking parameter when, the number of pulse signal judges institute based on the received
State whether frame data are odd-numbered frame；Be also used to when the frame data are odd-numbered frames, orientation by the odd-numbered frame carry out every
Row second is cumulative, until the second cumulative Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, described second
Accumulated value is the interlacing amplitude statistics mean value；It is also used to when the frame data are even frames, in orientation by the even number
Frame carries out that interlacing third is cumulative, until third add up Data in Azimuth Direction frame number greater than pre-configured orientation to deblocking parameter when,
The third accumulated value is the interlacing amplitude statistics mean value.
Further, the determination unit, specifically for comparing the interlacing amplitude statistics mean value with pre-determined threshold
Compared with；It is also used to that preset gain control code is increased by the when the interlacing amplitude statistics mean value is greater than the upper limit value of pre-determined threshold
One preset value obtains the gain control code；It is also used to be less than the lower limit value of pre-determined threshold when the interlacing amplitude statistics mean value
When, preset gain control code is reduced by the second preset value, obtains the gain control code；It is also used to when the interlacing amplitude statistics
Mean value is less than or equal to the upper limit value of pre-determined threshold, and the interlacing amplitude statistics mean value is more than or equal to the lower limit value of pre-determined threshold
When, keep preset gain control code constant, the preset gain control code is the gain control code.
Further, described device further include: receiving unit, for receiving synthetic aperture radar SAR echo signal；
The processing unit obtains the first signal for the SAR echo signal to be carried out the first signal processing.
Further, the processing unit, specifically for the SAR echo signal is amplified, down coversion, at filtering
Reason, obtains the first signal, and first signal is intermediate-freuqncy signal；
Alternatively,
The processing unit, specifically for the SAR echo signal is amplified, down coversion, filtering, at quadrature demodulation
Reason obtains the first signal, and first signal includes: the road I signal or the road Q signal；
Alternatively,
The processing unit, specifically for the SAR echo signal is amplified, is filtered, the first signal of acquisition,
First signal is radiofrequency signal.
The embodiment of the invention provides a kind of signal gain control method and device, the first signal that will acquire carries out modulus
Transformation, Digital Signal Processing obtain second signal；The second signal is subjected to interlacing amplitude statistics, determines that interlacing amplitude is united
Count mean value；According to the interlacing amplitude statistics mean value and pre-determined threshold, gain control code is determined, according to the gain control code pair
Signal carries out gain control.The embodiment of the invention provides signal gain control method and device, can be according to interlacing amplitude
It counts and determines gain control code, by the gain of gain control code automatic regulating system receives link signal, improve system remote sensing
Sensitivity.
Detailed description of the invention
Fig. 1 is the transmitting reception schematic diagram that single channel emits that dual channel receiver obtains four polarization informations；
Fig. 2 is H polarization reception channel reception data array exemplary diagram；
Fig. 3 is signal gain control method flow diagram one provided in an embodiment of the present invention；
Fig. 4 is signal gain control method flow diagram two provided in an embodiment of the present invention；
Fig. 5 is that signal gain provided in an embodiment of the present invention controls implementation example figure one；
Fig. 6 is that signal gain provided in an embodiment of the present invention controls implementation example figure two；
Fig. 7 is that signal gain provided in an embodiment of the present invention controls implementation example figure three；
Fig. 8 is that gain control code provided in an embodiment of the present invention determines flow chart；
Fig. 9 is that signal gain provided in an embodiment of the present invention controls implementation example figure four；
Figure 10 is signal gain controling device structure diagram one provided in an embodiment of the present invention；
Figure 11 is signal gain controling device structure diagram two provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.
Technical solution in embodiment in order to better understand the present invention, firstly, the prior art is briefly described,
As shown in Figure 1, single channel transmitting dual channel receiver realizes that the transmitting of four polarization acquisition of information receives schematic diagram, the first row in Fig. 1
For PRF lock-out pulse；The single pass transmitting pulse of second behavior, single transmission channel cross fire H polarization pulse and V polarization arteries and veins
Punching；Third behavior H polarization reception channel, H polarization reception channel reception HH polarized signal and VH polarized signal；Fourth line is the pole V
Change receiving channel, V polarization reception channel reception HV polarized signal and VV polarized signal, it is thus possible to hand over by single transmission channel
Fork emits two kinds of polarization pulse dual channel receivers and obtains four polarized signals.
Wherein, PRF (pulse recurrence frequency) i.e. pulse recurrence frequency, the triggering arteries and veins that each second generates
Number is rushed, is the inverse in pulse duration.Pulse duration is exactly between the time between pulse and next pulse
Every.
As shown in Fig. 2, by taking H polarization reception channel as an example, data arrangement after signal sampling is received, is laterally distance to the
The data arrangement of one behavior HH polarization data, the data arrangement of the second behavior VH polarization data；It is vertically orientation, data are in side
Position is to by HH, VH, HH, VH interlacing cross arrangement.
The embodiment of the present invention provides a kind of signal gain control method, as shown in figure 3, this method may include:
Step 101, the first signal that will acquire carry out analog to digital conversion, Digital Signal Processing, obtain second signal.
Specifically, the executing subject of signal gain control method provided in an embodiment of the present invention is signal gain control dress
It sets, which can be separately provided, and also can be set in SAR receiver, data shape device can also be set,
The embodiment of the present invention is not specifically limited in this embodiment.
Specifically, signal gain control device receives synthetic aperture radar SAR echo signal, by the SAR echo signal
The first signal processing is carried out, the first signal is obtained, then, the first signal is subjected to modulus AD transformation, Digital Signal Processing, is obtained
Second signal.
Wherein, first signal can be intermediate-freuqncy signal or radiofrequency signal, can also be demodulated I
Road signal or the road Q signal.
The second signal is carried out interlacing amplitude statistics by step 102, determines interlacing amplitude statistics mean value.
The second signal is carried out the cumulative summation of interlacing piecemeal by signal gain control device, determines that interlacing amplitude statistics is equal
Value, specifically, distance is arranged to the deblocking parameter with orientation in signal gain control device；When receiving pulse signal
Afterwards, the frame data of the second signal are obtained, the pulse signal instruction starts to obtain frame data；Second letter that will acquire
Number frame data carry out it is first cumulative, until the first accumulation distance to data amount check be greater than pre-determined distance to deblocking parameter
When, the number of pulse signal judges whether the frame data are odd-numbered frame based on the received；When the frame data are odd-numbered frames,
Orientation by the odd-numbered frame progress interlacing second add up, until the second cumulative Data in Azimuth Direction frame number be greater than pre-configured orientation to
Deblocking parameter when, second accumulated value be the interlacing amplitude statistics mean value；When the frame data are even frames,
Orientation by the even frame progress interlacing third add up, until third add up Data in Azimuth Direction frame number greater than pre-configured orientation to
Deblocking parameter when, the third accumulated value be the interlacing amplitude statistics mean value.
Step 103, according to the interlacing amplitude statistics mean value and pre-determined threshold, gain control code is determined, according to the increasing
Beneficial control code carries out gain control to signal.
Specifically, the interlacing amplitude statistics mean value is compared by signal gain control device with pre-determined threshold；Work as institute
When stating upper limit value of the interlacing amplitude statistics mean value greater than pre-determined threshold, preset gain control code is increased by the first preset value, is obtained
The gain control code；When the interlacing amplitude statistics mean value is less than the lower limit value of pre-determined threshold, by preset gain control code
It reduces by the second preset value, obtains the gain control code；When the interlacing amplitude statistics mean value is less than or equal to the upper of pre-determined threshold
Limit value, and the interlacing amplitude statistics mean value be more than or equal to pre-determined threshold lower limit value when, keep preset gain control code it is constant,
The preset gain control code is the gain control code, then, carries out gain control to signal according to gain control code.
Wherein, the first preset value and the second preset value can be 1, or others value.
Illustratively, gain control code can be generated by data shaper in the embodiment of the present invention, and data shaper is to solution
The cumulative summation of data interlacing piecemeal, accumulated value then control gain compared with preset thresholding, if it is greater than upper limit value after tune
Code increases by 1, and receiver numerical control attenuation amount increases at this time, and gain reduces, and input signal becomes smaller；It will if accumulated value is less than lower limit
Gain control code subtracts 1, and receiver numerical control attenuation amount reduces at this time, and gain increases, and input signal becomes larger.It so can automated closed-loop
Control input signal gain.When input signal gain is suitable, when so that accumulated value is between high and low thresholds, gain control code is not
Become.
It should be noted that method provided in an embodiment of the present invention can be applied in spaceborne multipolarization SAR system, it can also
To apply in any system by certain repetition rate return pulse signal, the method provided through the embodiment of the present invention is carried out
The system that automatic growth control, especially return pulse signal amplitude are significantly alternately changed by repetition rate.
The embodiment of the present invention provides a kind of signal gain control method, and gain control can be determined according to interlacing amplitude statistics
Code improves system remote sensing sensitivity by the gain of gain control code automatic regulating system receives link signal.
The embodiment of the present invention provides a kind of signal gain control method, as shown in figure 4, this method may include:
Step 201, signal gain control device receive synthetic aperture radar SAR echo signal, by the SAR echo signal
The first signal processing is carried out, the first signal is obtained.
Specifically, the executing subject of signal gain control method provided in an embodiment of the present invention is signal gain control dress
It sets, which can be separately provided, and also can be set in SAR receiver, data shape device can also be set,
The embodiment of the present invention is not specifically limited in this embodiment.
Wherein, first signal can be intermediate-freuqncy signal or radiofrequency signal, can also be demodulated I
Road signal or the road Q signal.
In a kind of possible implementation, the SAR echo signal is amplified, down coversion, filtering processing, obtains the
One signal, first signal are intermediate-freuqncy signal.
Wherein, down coversion refers to the intermediate-freuqncy signal obtained after mixing in superheterodyne receiver than original signal frequency
A kind of low mixing schemes of rate.The purpose of down coversion is that the carrier frequency or directly removal carrier frequency in order to reduce signal obtain
To baseband signal.
Illustratively, as shown in figure 5, SAR receiver by antenna receive SAR echo signal, to the SAR echo signal into
Row amplification, down coversion, filtering processing, obtain intermediate-freuqncy signal, gain control code are determined according to the intermediate-freuqncy signal, specifically, data
Shaper to intermediate-freuqncy signal carry out AD sampling transformation, quadrature demodulation and to demodulation rear video data interlacing amplitude statistics, according to system
Amplitude equalizing value adjust gain control code is counted, output gain control code to receiver controls its numerical-control attenuator adjustment input signal and increases
Benefit.Operating mode parameter can be issued to data shaper by monitoring computer, with data during flexible setting amplitude statistics point
Block size.
In a kind of possible implementation, the SAR echo signal is amplified, down coversion, filtering, at quadrature demodulation
Reason obtains the first signal, and first signal includes: the road I signal or the road Q signal.
Illustratively, as shown in fig. 6, SAR receiver by antenna receive SAR echo signal, to the SAR echo signal into
Row amplification, down coversion, filtering, quadrature demodulation processing, obtain the road I signal and the road Q signal respectively, determine that the road I increases according to the road I signal
Beneficial control code determines the road Q gain control code according to the road Q signal.
In a kind of possible implementation, the SAR echo signal is amplified, is filtered, obtains the first signal,
First signal is radiofrequency signal.
Illustratively, as shown in fig. 7, SAR receiver by antenna receive SAR echo signal, to the SAR echo signal into
Row amplification, filtering processing, obtain radiofrequency signal, determine gain control code according to the radiofrequency signal.
The first signal that step 202, signal gain control device will acquire carries out analog to digital conversion, Digital Signal Processing, obtains
Obtain second signal.
The second signal is carried out the cumulative summation of interlacing piecemeal by step 203, signal gain control device, determines interlacing width
Spend average statistical.
Specifically, distance is arranged to the deblocking parameter with orientation in signal gain control device；When receiving pulse
After signal, the frame data of the second signal are obtained, the pulse signal instruction starts to obtain frame data；Will acquire described
The frame data of binary signal carry out it is first cumulative, until the first accumulation distance to data amount check be greater than pre-determined distance to deblocking
When parameter, the number of pulse signal judges whether the frame data are odd-numbered frame based on the received；When the frame data are odd numbers
When frame, odd-numbered frame progress interlacing second is added up in orientation, is preset until the second cumulative Data in Azimuth Direction frame number is greater than
When the deblocking parameter of orientation, second accumulated value is the interlacing amplitude statistics mean value；When the frame data are even
When number frame, even frame progress interlacing third is added up in orientation, until third adds up Data in Azimuth Direction frame number greater than pre-
If when the deblocking parameter of orientation, the third accumulated value is the interlacing amplitude statistics mean value.
Step 204, signal gain control device determine gain control according to the interlacing amplitude statistics mean value and pre-determined threshold
Code processed carries out gain control to signal according to the gain control code.
Specifically, when the interlacing amplitude statistics mean value is the second accumulated value, according to the interlacing amplitude statistics mean value
And pre-determined threshold, determine gain control code, comprising:
Second accumulated value is compared with pre-determined threshold；
When second accumulated value is greater than the upper limit value of pre-determined threshold, preset gain control code increase by first is preset
Value；
When second accumulated value is less than the lower limit value of pre-determined threshold, preset gain control code reduction second is preset
Value；
When upper limit value of second accumulated value less than or equal to pre-determined threshold, and it is more than or equal to the lower limit value of pre-determined threshold
When, keep preset gain control code constant.
Specifically, when the interlacing amplitude statistics mean value is third accumulated value, according to the interlacing amplitude statistics mean value
And pre-determined threshold, determine gain control code, comprising:
The third accumulated value is compared with pre-determined threshold；
When the third accumulated value is greater than the upper limit value of pre-determined threshold, preset gain control code increase by first is preset
Value；
When the third accumulated value is less than the lower limit value of pre-determined threshold, preset gain control code reduction second is preset
Value；
When upper limit value of the third accumulated value less than or equal to pre-determined threshold, and it is more than or equal to the lower limit value of pre-determined threshold
When, keep preset gain control code constant.
Illustratively, gain control code determines process, as shown in figure 8, after signal gain control device obtains second signal,
Distance is set to the deblocking size with orientation, according to whether receiving PRF pulse signal determines the synchronous starting of frame data,
The instruction of PRF pulse signal starts to obtain frame data；I.e. after receiving PRF pulse signal, start the frame data of second signal, it will
The frame data of the second signal of acquisition carry out Continuous accumulation, when frame data add up number greater than preset data piecemeal size,
The number of PRF pulse signal judges that the frame data are odd-numbered frame or even frame, the i.e. received PRF of odd-times based on the received
The frame data of pulse signal are odd-numbered frames, and the frame data of the received PRF pulse signal of even-times are even frames.
When frame data are odd-numbered frames, odd-numbered frame progress interlacing is added up in orientation, until the orientation number that adds up
According to frame number be greater than pre-configured orientation to deblocking size when, which is compared with pre-determined threshold, when the accumulated value
Greater than pre-determined threshold upper limit value when, preset gain control code is added 1, stores odd-numbered frame gain control code, output even frame increases
Beneficial control code；When the accumulated value is less than the lower limit value of pre-determined threshold, preset gain control code is subtracted 1, stores odd-numbered frame gain
Control code exports even frame gain control code, when upper limit value of the accumulated value less than or equal to pre-determined threshold, and is more than or equal to pre- gating
It when the lower limit value of limit, keeps preset gain control code constant, stores odd-numbered frame gain control code, output even frame gain control
Code.
When frame data are even frames, even frame progress interlacing is added up in orientation, until the orientation number that adds up
According to frame number be greater than pre-configured orientation to deblocking size when, which is compared with pre-determined threshold, when the accumulated value
Greater than pre-determined threshold upper limit value when, preset gain control code is added 1, stores even frame gain control code, output odd-numbered frame increases
Beneficial control code；When the accumulated value is less than the lower limit value of pre-determined threshold, preset gain control code is subtracted 1, stores even frame gain
Control code exports odd-numbered frame gain control code, when upper limit value of the accumulated value less than or equal to pre-determined threshold, and is more than or equal to pre- gating
It when the lower limit value of limit, keeps preset gain control code constant, stores even frame gain control code, output odd-numbered frame gain control
Code.
Illustratively, as shown in figure 5, receiver receives radiofrequency signal, intermediate-freuqncy signal is exported after amplification, down coversion, filtering,
Data shaper demodulates intermediate frequency signal in orthogonal, adjusts increasing to the orthogonal video data amplitude statistics after demodulation and compared with thresholding
Beneficial control code, thresholding used in comparison procedure have been set as needed two groups, and monitoring computer input parameter determines which is used
Kind thresholding, while amplitude statistics deblocking parameter is inputted also by monitoring computer.
In the embodiment of the present invention, input signal carries out gain adjustment by gain control code, and data shaper determines gain
After control code, which can be transferred to numerical-control attenuator, numerical-control attenuator is according to the gain control code to signal
It is adjusted.Numerical-control attenuator can be to the device that signal is adjusted by gain control code, be also possible to other devices,
It can integrate in receivers, as shown in Fig. 5, Fig. 6, Fig. 7, also can integrate in data shaper, as shown in figure 9,
It is placed on the other positions of input signal link.
In the embodiment of the present invention, data shaper is converted by AD input analog signal being converted into digital quantity, in number
To the amplitude of signal judgement signal magnitude for statistical analysis in domain, data shaper is cumulative using interlacing to input data analysis
Summation, gain control code also interlacing output control, adapts to multipolarization SAR system cross polarization input signal.Cumulative data piecemeal
Size can include distance by state modulator, parameter to Data in Azimuth Direction piecemeal length；The cumulative interlacing of interlacing controls not shadow
Ring automatic growth control (AGC, the Automatic Gain Control) control that the present invention is applied to single polarization input signal.
In practical applications, data shaper can be by being realized to the adjustment of gain control code by FPGA, and FPGA is several
According to the digital signal processing device of shaper, it carries out signal processing to SAR echo data as needed, and piecemeal adds up and door
It limits relatively and adjusts output gain control code；Gain can also be generated by completing statistical analysis with DSP, CPU, asic chip
Control code.
Method provided in an embodiment of the present invention realized in multipolarization SAR system by data shaper and receiver, but simultaneously
It is not excluded for controlling SAR system AGC using the method for the present invention with other equipment or combination.
The embodiment of the invention provides signal gain control method, gain control can be determined according to interlacing amplitude statistics
Code improves system remote sensing sensitivity by the gain of gain control code automatic regulating system receives link signal.
The embodiment of the present invention provides a kind of signal gain control device 1, and as shown in Figure 10, described device 1 includes: that processing is single
First 10, determination unit 11, control unit 12, wherein
The processing unit 10, the first signal for will acquire carry out analog to digital conversion, Digital Signal Processing, obtain second
Signal；
The determination unit 11 determines that interlacing amplitude statistics is equal for the second signal to be carried out interlacing amplitude statistics
Value；It is also used to determine gain control code according to the interlacing amplitude statistics mean value and pre-determined threshold；
Described control unit 12, for carrying out gain control to signal according to the gain control code.
Further, the determination unit 11 is specifically used for carrying out the second signal into the cumulative summation of interlacing piecemeal, really
Determine interlacing amplitude statistics mean value.
Further, as shown in figure 11, the determination unit 11 includes: setup module 110, obtains module 111, cumulative mould
Block 112,
The setting mould 110, for distance to be arranged to the deblocking parameter with orientation；
The acquisition module 111, it is described for after receiving pulse signal, obtaining the frame data of the second signal
Pulse signal instruction starts to obtain frame data；
The accumulator module 112, the frame data of the second signal for will acquire carry out first and add up, until first
Accumulation distance to data amount check be greater than pre-determined distance to deblocking parameter when, based on the received pulse signal number judgement
Whether the frame data are odd-numbered frame；It is also used to carry out the odd-numbered frame in orientation when the frame data are odd-numbered frames
Interlacing second is cumulative, until the second cumulative Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, described the
Two accumulated values are the interlacing amplitude statistics mean value；It is also used to when the frame data are even frames, in orientation by the idol
Number frames carry out that interlacing thirds are cumulative, until third add up Data in Azimuth Direction frame number greater than pre-configured orientation to deblocking parameter
When, the third accumulated value is the interlacing amplitude statistics mean value.
Further, the determination unit 11 is specifically used for carrying out the interlacing amplitude statistics mean value and pre-determined threshold
Compare；It is also used to increase preset gain control code when the interlacing amplitude statistics mean value is greater than the upper limit value of pre-determined threshold
First preset value obtains the gain control code；It is also used to be less than the lower limit of pre-determined threshold when the interlacing amplitude statistics mean value
When value, preset gain control code is reduced by the second preset value, obtains the gain control code；It is also used to unite when the interlacing amplitude
The upper limit value that mean value is less than or equal to pre-determined threshold is counted, and the interlacing amplitude statistics mean value is more than or equal to the lower limit value of pre-determined threshold
When, keep preset gain control code constant, the preset gain control code is the gain control code.
Further, as shown in figure 11, described device further include: receiving unit 13, for receiving synthetic aperture radar SAR
Echo-signal；
The processing unit 10 obtains the first signal for the SAR echo signal to be carried out the first signal processing.
Further, the processing unit 10, specifically for amplifying the SAR echo signal, down coversion, filtering
Processing, obtains the first signal, and first signal is intermediate-freuqncy signal；
Alternatively,
The processing unit 10, specifically for amplifying the SAR echo signal, down coversion, filtering, quadrature demodulation
Processing obtains the first signal, and first signal includes: the road I signal or the road Q signal；
Alternatively,
The processing unit 10 obtains the first letter specifically for amplifying, being filtered by the SAR echo signal
Number, first signal is radiofrequency signal.
Specifically, the understanding of signal gain control device provided in an embodiment of the present invention can refer to above-mentioned signal gain control
The explanation of method processed, details are not described herein for the embodiment of the present invention.
The embodiment of the invention provides signal gain control device, gain control can be determined according to interlacing amplitude statistics
Code improves system remote sensing sensitivity by the gain of gain control code automatic regulating system receives link signal.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the present invention
Formula.Moreover, the present invention, which can be used, can use storage in the computer that one or more wherein includes computer usable program code
The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (10)
1. a kind of signal gain control method, which is characterized in that the described method includes:
The first signal that will acquire carries out analog to digital conversion, Digital Signal Processing, obtains second signal；
The second signal is subjected to interlacing amplitude statistics, determines interlacing amplitude statistics mean value；
According to the interlacing amplitude statistics mean value and pre-determined threshold, gain control code is determined, according to the gain control code to letter
Number carry out gain control；
Wherein, described according to the interlacing amplitude statistics mean value and pre-determined threshold, determine gain control code, comprising:
The interlacing amplitude statistics mean value is compared with pre-determined threshold；
When the interlacing amplitude statistics mean value is greater than the upper limit value of pre-determined threshold, preset gain control code increase by first is preset
Value, obtains the gain control code；
When the interlacing amplitude statistics mean value is less than the lower limit value of pre-determined threshold, preset gain control code reduction second is preset
Value, obtains the gain control code；
When upper limit value of the interlacing amplitude statistics mean value less than or equal to pre-determined threshold, and the interlacing amplitude statistics mean value is greater than
Equal to pre-determined threshold lower limit value when, keep preset gain control code it is constant, the preset gain control code be the gain control
Code processed.
2. the method according to claim 1, wherein it is described by the second signal carry out interlacing amplitude statistics,
Determine interlacing amplitude statistics mean value, comprising:
The second signal is subjected to the cumulative summation of interlacing piecemeal, determines interlacing amplitude statistics mean value.
3. according to the method described in claim 2, it is characterized in that, described second signal progress interlacing piecemeal adds up is asked
With determine interlacing amplitude statistics mean value, comprising:
Distance is set to the deblocking parameter with orientation；
After receiving pulse signal, the frame data of the second signal are obtained, the pulse signal instruction starts to obtain frame number
According to；
The frame data for the second signal that will acquire carry out first and add up, until the first accumulation distance is greater than in advance to data amount check
If distance to deblocking parameter when, the number of pulse signal judges whether the frame data are odd-numbered frame based on the received；
When the frame data are odd-numbered frames, odd-numbered frame progress interlacing second is added up in orientation, until second cumulative
Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, second accumulated value be the interlacing amplitude statistics
Mean value；
When the frame data are even frames, even frame progress interlacing third is added up in orientation, until third is cumulative
Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, the third accumulated value be the interlacing amplitude statistics
Mean value.
4. the method according to claim 1, wherein first signal that will acquire carry out analog to digital conversion,
Digital Signal Processing, obtain second signal before, further includes:
Receive synthetic aperture radar SAR echo signal；
The SAR echo signal is subjected to the first signal processing, obtains the first signal.
5. according to the method described in claim 4, it is characterized in that, described carry out the SAR echo signal at the first signal
Reason obtains the first signal, comprising:
The SAR echo signal is amplified, down coversion, filtering processing, obtain the first signal, first signal is intermediate frequency
Signal；
Alternatively,
The SAR echo signal is amplified, down coversion, filtering, quadrature demodulation processing, the first signal of acquisition, described first
Signal includes: the road I signal or the road Q signal；
Alternatively,
The SAR echo signal is amplified, is filtered, the first signal is obtained, first signal is radiofrequency signal.
6. a kind of signal gain control device, which is characterized in that described device includes: processing unit, determination unit, control list
Member, wherein
The processing unit, the first signal for will acquire carry out analog to digital conversion, Digital Signal Processing, obtain second signal；
The determination unit determines interlacing amplitude statistics mean value for the second signal to be carried out interlacing amplitude statistics；Also use
According to the interlacing amplitude statistics mean value and pre-determined threshold, gain control code is determined；
The determination unit, specifically for the interlacing amplitude statistics mean value to be compared with pre-determined threshold；It is also used to work as institute
When stating upper limit value of the interlacing amplitude statistics mean value greater than pre-determined threshold, preset gain control code is increased by the first preset value, is obtained
The gain control code；It is also used to when the interlacing amplitude statistics mean value is less than the lower limit value of pre-determined threshold, by preset gain
Control code reduces by the second preset value, obtains the gain control code；It is also used to be less than or equal to when the interlacing amplitude statistics mean value
The upper limit value of pre-determined threshold, and when the interlacing amplitude statistics mean value is more than or equal to the lower limit value of pre-determined threshold, it keeps default and increases
Beneficial control code is constant, and the preset gain control code is the gain control code；
Described control unit, for carrying out gain control to signal according to the gain control code.
7. device according to claim 6, which is characterized in that the determination unit is specifically used for the second signal
The cumulative summation of interlacing piecemeal is carried out, determines interlacing amplitude statistics mean value.
8. device according to claim 7, which is characterized in that the determination unit include: setup module, obtain module,
Accumulator module,
The setup module, for distance to be arranged to the deblocking parameter with orientation；
The acquisition module, for after receiving pulse signal, obtaining the frame data of the second signal, the pulse signal
Instruction starts to obtain frame data；
The accumulator module, the frame data of the second signal for will acquire carry out it is first cumulative, until first it is cumulative away from
Descriscent data amount check be greater than pre-determined distance to deblocking parameter when, the number of pulse signal judges the frame based on the received
Whether data are odd-numbered frame；It is also used to when the frame data are odd-numbered frames, the odd-numbered frame is subjected to interlacing the in orientation
Two is cumulative, until the second cumulative Data in Azimuth Direction frame number be greater than pre-configured orientation to deblocking parameter when, described second is cumulative
Value is the interlacing amplitude statistics mean value；Be also used to when the frame data are even frames, orientation by the even frame into
Row interlacing third is cumulative, until third add up Data in Azimuth Direction frame number greater than pre-configured orientation to deblocking parameter when, it is described
Third accumulated value is the interlacing amplitude statistics mean value.
9. device according to claim 6, which is characterized in that described device further include: receiving unit, for receiving synthesis
Aperture radar SAR echo signal；
The processing unit obtains the first signal for the SAR echo signal to be carried out the first signal processing.
10. device according to claim 9, which is characterized in that
The processing unit obtains the first letter specifically for amplifying the SAR echo signal, down coversion, filtering processing
Number, first signal is intermediate-freuqncy signal；
Alternatively,
The processing unit, specifically for the SAR echo signal is amplified, down coversion, filtering, quadrature demodulation processing,
The first signal is obtained, first signal includes: the road I signal or the road Q signal；
Alternatively,
The processing unit, specifically for amplifying, being filtered by the SAR echo signal, the first signal of acquisition is described
First signal is radiofrequency signal.
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| CN109270498B (en) * | 2018-08-01 | 2019-11-15 | 中国科学院国家空间科学中心 | A kind of AGC adjusting method of the spaceborne interference imaging altimeter based on FPGA |
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