CN110261834A - A method of improving mixing radar signal quality - Google Patents
A method of improving mixing radar signal quality Download PDFInfo
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- CN110261834A CN110261834A CN201910657314.1A CN201910657314A CN110261834A CN 110261834 A CN110261834 A CN 110261834A CN 201910657314 A CN201910657314 A CN 201910657314A CN 110261834 A CN110261834 A CN 110261834A
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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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
Abstract
Present invention relates particularly to a kind of methods for improving mixing radar signal quality, comprising the following steps: (1) generates software by signal and import multi-section mixing radar signal parameter, input parameter type is defined as Array for structural body；(2) pulsewidth, signal amplitude and the repetition period of each radar signal are extracted；(3) the empty window time for calculating each radar signal constitutes empty window time array；(4) according to the empty window time, using zero to optimal delay time and proportionality coefficient between empty window time product as the delay time of each radar signal；(5) statistics mixes the amplitude information of radar signal and the amplitude of each radar signal is normalized；(6) it after according to the range parameter of obtained delay time and mixing radar signal, calculates the aliasing parameter of mixed signal and generates radar waveform file.Present invention improves mixing radar signal quality, improve the signal imitation effect of radar signal simulator.
Description
Technical field
The invention belongs to the generation of radar target signal and simulation fields, and in particular to a kind of improvement mixing radar signal quality
Method.
Background technique
Modern radar system is full-featured and performance is complicated, can be scanned, tracks, identifies and guide strike simultaneously
Multiple targets.When radar system is researched and developed and is tested, it usually needs tested using suitable target simulator.Using radar
When signal simulator generates mixing radar signal, radar waveform exports after analog-to-digital conversion, and mixing radar signal is indicated in radar
The information of multi-section radar is existed simultaneously in one radar waveform of signal simulator simulation.
The quality of radar signal is mixed mainly with the measurement of signal power dynamic range, after digital-to-analogue conversion, is presented as every
The difference that the maximum power of one radar signal and bottom are made an uproar.When the amplitude of the digital signal of injection digital analog converter turns more than digital-to-analogue
The maximum magnitude of parallel operation then will appear the saturation distortion of signal, therefore need to carry out mixed signal amplitude before being converted
Normalization, makes it below saturation threshold.The bottom of output signal is made an uproar to be determined by device itself and output channel, and mixes radar signal
Amplitude it is bigger, the normalization amplitude of each radar signal is smaller, and signal power dynamic range is with regard to smaller.Mix radar signal
Quality can judge the effect of radar signal simulator, directly affect the later period of the radar signal of radar signal simulator generation
Using test etc..Therefore the method for signal amplitude after needing one kind that can adjust mixing, to improve the quality of mixing radar signal.
Summary of the invention
The object of the present invention is to provide one kind by adjusting the mixed signal amplitude of radar signal, to improve mixing radar
The method of signal quality.
For achieving the above object, the technical scheme adopted by the invention is that: a kind of improvement mixes radar signal quality
Method, comprising the following steps:
(1) software is generated by signal and imports multi-section mixing radar signal parameter, input parameter type is defined as structural body
Array；
(2) in extraction step (1) each radar signal pulsewidth τ, signal amplitude A and repetition period PRI；
(3) the empty window time T of each radar signal is calculatedidle, constitute empty window time array.Wherein, empty window time TidleFor
The difference of repetition period characteristic value and pulsewidth:
Tidle(i)=repetition period PRI characteristic value (i)-radar pulsewidth τ (i)；
(4) according to the empty window time T of step (3)idle, zero is arrived optimal delay time and the ratio system between the empty window time
Delay time T of the product of number F as each radar signaldelay:
Tdelay(i)=_ radar_delay (Tidle(i))·F；
Wherein, the optimal delay time of each radar signal is calculated with function _ radar_delay ()；
(5) the amplitude information A of statistics mixing radar signalmAnd the amplitude of each radar signal is normalized:
Am=_ statstic_amp ()；
Ai=Ai/Am·Q；
Wherein, amplitude information AmIt is calculated by function _ statstic_amp (), Q is the maximum quantization value of digital analog converter；
(6) the delay time T obtained according to step (4) and step (5)delayAfter the range parameter of mixing radar signal,
It calculates the aliasing parameter of mixed signal and generates radar waveform file.
Preferably, the Array for structural body length is radar signal number, and the Array for structural body includes radar signal
Pulsewidth, repetition period, signal amplitude, frequency pattern, intra-pulse modulation mode, systematic sampling rate.
Preferably, repetition period PRI described in the step (2) includes fixed, irregular, sliding change and wobble type.
Preferably, the repetition period PRI characteristic value is the characteristic value through the processing of function _ deal_pri (), the function _
The calculation method of deal_pri () is to calculate repetition period characteristic value according to the type of repetition period, and repetition period PRI is solid
Fixed, sliding change and irregular three types, repetition period PRI characteristic value are the input repetition period, and repetition period PRI is wobble type,
Repetition period PRI characteristic value takes the average value of input pulse repetition period.
Preferably, the proportionality coefficient F in the step (4) in each radar signal delay time is set as identical normal
Number.
Preferably, function _ radar_delay () calculation method described in the step (4) is the empty window according to signal
Time array Tidle, the maximum value and minimum value of input signal data delay are calculated, will be randomly generated between maximum value and minimum
Delay between value is delayed as signal.
Preferably, function _ statstic_amp () calculation method described in the step (5) is to be believed according to multiple radars
Arrangement number in time, counts in each moment, the signal number of aliasing and the signal amplitude after aliasing, finally one by one
The maximum value of aliasing amplitude is taken to export as a result.
The invention has the following advantages: in the inventive solutions, the present invention obtains each radar signal and exists
Time delay and amplitude information before aliasing reduce radar signal in same position by controlling the delay time of signal
The control of mixed amplitude is a lesser value to control mixing radar signal amplitude by aliasing, so as to improve mixing thunder
Up to the quality of signal, the effect of radar signal simulator can be effectively improved, providing signal quality, more preferably hybrid analog-digital simulation is believed
Number.
Detailed description of the invention
Fig. 1 is overview flow chart of the present invention；
Fig. 2 is the radar waveform analogous diagram that the method for the present invention is not used；
Fig. 3 is the radar waveform analogous diagram using the method for 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, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
The information of multi-section radar is existed simultaneously in a radar waveform of radar signal simulator simulation, forms mixing thunder
Up to signal.When using radar signal is mixed, radar waveform exports after digital-to-analogue conversion, mix the quality of radar signal mainly with
Signal power dynamic range is measured, and after digital-to-analogue conversion, is presented as the difference that the maximum power of each radar signal and bottom are made an uproar
Value.Mix radar signal amplitude between the maximum value of single radar signal amplitude and all radar signal amplitudes and between.It needs
Digital analog converter output signal is injected after mixing radar signal amplitude is normalized, avoids the occurrence of signal saturation distortion.It is defeated
The bottom of signal is made an uproar out is determined by device itself and output channel, this is the influence of specific device, can not be controlled, and mixes thunder
Amplitude up to signal is bigger, then the normalization amplitude of each radar signal is smaller, and signal power dynamic range is with regard to smaller, i.e., mixed
Close radar signal Power Dynamic Range by, mix radar signal amplitude influence, therefore can pass through control mixing radar width
Degree mixes radar signal quality to improve.
Refering to fig. 1, a kind of method improving mixing radar signal quality provided by the invention uses following steps:
(1) mixing radar signal parameter is imported；
(2) pulsewidth, amplitude and the repetition period of each radar signal are extracted；
(3) the calculating empty window time obtains sky window time array；
(4) delay time of each radar signal is calculated；
(5) amplitude information of statistics mixing radar signal；
(6) radar waveform file is generated.
Further, the particular content of the step (1) are as follows: software is generated by signal and imports multi-section mixing radar signal
Parameter, for generating the aliasing signal of multi-section radar, input parameter type is defined as Array for structural body, the length of Array for structural body
It is identical as the number of radar signal.Further, the element in structural body includes the pulsewidth of radar signal, repetition period, letter
The parameters such as number amplitude, frequency pattern, intra-pulse modulation mode, systematic sampling rate.
Further, the particular content of the step (2) are as follows: the pulsewidth τ of each radar signal, letter in extraction step (1)
Number amplitude A and repetition period PRI.Further, the repetition period includes fixed, irregular, sliding change and wobble type, described
Repetition period PRI is warp _ deal_pri () function processing characteristic value.
Wherein, _ deal_pri () function, circular be according to the different type of repetition period (it is fixed, irregular,
Sliding change and shake) repetition period characteristic value is calculated, wherein fixed, sliding change and irregular three types, characteristic value are inputted and are repeated
Period, the repetition period characteristic value of wobble type take the average value of input pulse repetition period.
Further, the particular content of the step (3) are as follows: calculate the empty window time T of each radar signalidle, constitute
Empty window time array.Wherein, empty window time TidleFor repeat periodic proper value and pulsewidth difference:
Tidle(i)=repetition period PRI characteristic value (i)-radar pulsewidth τ (i)；
By calculating the empty window time of each radar signal, top is provided in the computing relay time for each radar signal
Boundary.
Further, the particular content of the step (4) are as follows: according to the empty window time T of step (3)idle, by zero to empty window
Delay time T of the product of optimal delay time and proportionality coefficient F between time as each radar signaldelay:
Tdelay(i)=_ radar_delay (Tidle(i))·F；
Wherein, the optimal delay time of each radar signal is calculated with function _ radar_delay ()._radar_delay
() function, according to the empty window time array T of signalidle, the maximum and minimum value of input data delay is obtained, then Jie is randomly generated
Delay between maximum and minimum value is delayed as signal.
By the reasonable delay to each radar signal, multiple radar signals are effectively reduced in the general of same position aliasing
Rate, to reduce total amplitude of the radar signal after aliasing.
Further, the proportionality coefficient F in each radar signal delay time is set as identical constant, so as to every
The delay time of a radar signal has carried out control in proportion, does not influence the otherness of every radar signal delay time.
Further, the particular content of the step (5) are as follows: the amplitude information A of statistics mixing radar signalmAnd to each
The amplitude of radar signal is normalized:
Am=_ statstic_amp ()；
Ai=Ai/Am·Q；
Wherein, aliasing signal amplitude information AmIt is calculated by function _ statstic_amp (), _ statstic_amp () letter
Number, effect are the amplitude peak A after the multiple radar signal aliasings of statisticsm, specific method is according to multiple radar signals in the time
On arrangement, counted one by one in each moment, the signal number of aliasing and the amplitude after aliasing, finally take aliasing amplitude
Maximum value exports as a result.Q is the maximum quantization value of digital analog converter.
It by the amplitude information of statistics mixing radar signal, and is normalized, can be avoided and postpone by signal
Afterwards still with the presence of aliasing signal with a lesser amplitude, to further prevent distortion when signal digital-to-analogue conversion.
By normalized mixing radar signal amplitude, corresponding each radar signal is obtained are as follows:
Thus each radar signal amplitude obtains the reduction of adaptability, further the amplitude of control mixing radar signal.
Further, the particular content of the step (6) are as follows: the delay time obtained according to step (4) and step (5)
TdelayWith the range parameter A of mixing radar signalmAfterwards, using Multiple Target Signals synthetic method, the aliasing ginseng of mixed signal is calculated
It counts and generates radar waveform file, it is to be understood that the Multiple Target Signals synthetic method selected is believed for a kind of fast multi-target
Number synthetic method (CN107589411 A) or a kind of no breakpoint Multiple Target Signals synthetic method (CN107589410 A).It is calculating
After completion, algorithm is exited, is then called using the waveform generator that the method that digital-to-analogue conversion is used arbitrarily generates analog signal
Radar waveform file, output mixing radar signal.
A kind of synthetic method of fast multi-target signal synthesis method as Multiple Target Signals is selected in the present embodiment, logical
It crosses after the above method obtains the delay time of radar signal and the range parameter of mixing radar signal, obtains updated signal ginseng
Number, including signal number, the delay of signal, signal pulsewidth, signal pulse recurrence interval, signal intra-pulse modulation mode and signal arteries and veins
Internal modulation parameter, and be discrete time signal parameter by continuous signal Parameter Switch by signal parameter；Pass through signal envelope information
Processing obtains the envelope information after Multiple Target Signals synthesis and the envelope information between individual signals and composite signal；Pass through
The processing of composite signal intrapulse information adds intra-pulse modulation information to composite signal, forms multiple target wave file, finally arbitrarily adopts
Radar waveform file, output mixing radar signal are called with the waveform generator that the method for digital-to-analogue conversion generates analog signal.
Refering to Fig. 2~3, respectively when using identical Multiple Target Signals synthetic method, the method for the present invention is not used to mixed
Radar signal is closed to carry out pretreatment and carry out pretreated radar wave figurate number to mixed signal radar signal using the method for the present invention
According to wherein mixing radar number is 15 for the average power signal converted by signal amplitude.As can be seen that this hair is not used
When bright method, radar waveform is excessively concentrated in initial position, and average power signal is 0.5 × 104Hereinafter, and applying new side
After method, average power signal is more than 2 × 104And it is uniformly distributed.Engineering can be obtained by repeatedly measurement and practical application in the present invention
Conclusion, i.e., using after new method, mixing radar signal signal-to-noise ratio is lifted beyond 5dB.
The present invention is by by the delay time of control radar signal, reducing radar letter before Multiple Target Signals synthesize
Number the aliasing in same position amplitude is adjusted to a small value to adjust the amplitude of mixing radar signal, reduce due to
When digital-to-analogue conversion mixing radar signal amplitude is excessive cause to be normalized after influence radar power dynamic range influence,
So as to improve mixing radar signal quality, the signal imitation effect of radar signal simulator can be effectively improved, letter is provided
Number quality more preferably analog signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of method for improving mixing radar signal quality, which comprises the following steps:
(1) software is generated by signal and imports multi-section mixing radar signal parameter, input parameter type is defined as Array for structural body；
(2) in extraction step (1) each radar signal pulsewidth τ, signal amplitude A and repetition period PRI；
(3) the empty window time T of each radar signal is calculatedidle, constitute empty window time array, in which:
Tidle(i)=repetition period PRI characteristic value (i)-radar pulsewidth τ (i)；
(4) according to the empty window time T of step (3)idle, by zero to empty window time TidleBetween the optimal delay time and ratio system
Delay time T of the product of number F as each radar signaldelay:
Tdelay(i)=_ radar_delay (Tidle(i))·F；
Wherein, the optimal delay time of each radar signal is calculated with function _ radar_delay ()；
(5) the amplitude information A of statistics mixing radar signalmAnd the amplitude of each radar signal is normalized:
Am=_ statstic_amp ()；
Ai=Ai/Am·Q；
Wherein, amplitude information AmIt is calculated by function _ statstic_amp (), Q is the maximum quantization value of digital analog converter；
(6) the delay time T obtained according to step (4) and step (5)delayAfter the range parameter of mixing radar signal, utilize
Multiple Target Signals synthetic method calculates the aliasing parameter of mixed signal and generates radar waveform file.
2. a kind of method for improving mixing radar signal quality according to claim 1, it is characterised in that: the structural body
Array length is radar signal number, and the Array for structural body includes pulsewidth, repetition period, the signal amplitude, frequency of radar signal
Rate pattern, intra-pulse modulation mode, systematic sampling rate.
3. a kind of method for improving mixing radar signal quality according to claim 1, it is characterised in that: the step
(2) repetition period PRI described in includes fixed, irregular, sliding change and wobble type.
4. a kind of method for improving mixing radar signal quality according to claim 3, it is characterised in that: described to repeat week
Phase PRI is through function _ deal_pri () processing characteristic value, and the function _ deal_pri () calculation method is according to repetition
The type of period PRI calculates repetition period characteristic value；The repetition period PRI is fixed, sliding change and irregular three types, is repeated
Periodic proper value is the input repetition period；The repetition period PRI is wobble type, and repetition period characteristic value takes input pulse weight
The average value in multiple period.
5. a kind of method for improving mixing radar signal quality according to claim 1, it is characterised in that: the step
(4) the proportionality coefficient F in each radar signal delay time is set as identical constant.
6. a kind of method for improving mixing radar signal quality according to claim 1, it is characterised in that: the step
(4) function described in _ radar_delay () calculation method is the empty window time array T according to signalidle, calculate input letter
The maximum value and minimum value of number delay, the delay being randomly generated between maximum value and minimum value is prolonged as signal
When.
7. a kind of method for improving mixing radar signal quality according to claim 1, it is characterised in that: the step
(5) function described in _ statstic_amp () calculation method is the arrangement according to multiple radar signals in time, one by one
Statistics finally takes the maximum value of aliasing amplitude to make in each moment, the signal number of aliasing and the signal amplitude after aliasing
For result output.
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