CN107329123A - A kind of weak radar pulse envelope signal detecting method and device - Google Patents
A kind of weak radar pulse envelope signal detecting method and device Download PDFInfo
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- CN107329123A CN107329123A CN201710543286.1A CN201710543286A CN107329123A CN 107329123 A CN107329123 A CN 107329123A CN 201710543286 A CN201710543286 A CN 201710543286A CN 107329123 A CN107329123 A CN 107329123A
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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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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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
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Abstract
The present invention proposes a kind of weak radar pulse envelope signal detecting method and device, including：Radar signal to input carries out digital channelizing processing, including：The radar signal of input is extracted and filtered using many phase band pass filter groups, and exported after Fourier's FFT the sample point of multiple channels, to realize that digital channelizing is handled；I Q form signals after being handled according to digital channelizing, calculating obtains multiple signals amplitude, and it is signal envelope to extract signal amplitude maximum at same time point；Using the pulse detection algorithm based on channel number, whether pulse detection is carried out continuously according to channelizing to obtained signal envelope, to ensure to detect weak radar pulse signal.The present invention improves signal detection sensitivity, and ensures to detect complete pulse signal.
Description
Technical field
Scouted the present invention relates to the radar pulse signal in electronic reconnaissance and acquisition techniques field, more particularly to a kind of weak thunder
Up to pulse envelope signal detecting method and device.
Background technology
Then radar receives by certain specific signal to spatial emission and handles the echo-signal of target to realize hair
Existing target simultaneously determines its coordinate.The primary and foremost purpose of Radar Signal Processing is exactly that the signal of reception is processed, eliminate or
The various interference of reduction, noise and the uncertainty as caused by these interference, noise, in order to extract information needed and carry
The quality of high information., it is necessary to intercept and capture and analyze radar signal form for radar-reconnaissance, form situation and judge.
At present, relatively common is that the parameters such as the amplitude to radar signal, frequency, pulsewidth, orientation are measured, and then right
Radar is identified and threat assessment.With developing rapidly and jamproof needs for Radar Technology, low probability of intercept thunder
Reach the direction developed for radar.
How this radar signal is intercepted and captured, and the detection of the especially this small and weak signal of non-cooperation always is electronic reconnaissance
The problem in field.
The content of the invention
The purpose of the present invention is intended at least solve one of described technological deficiency.
Therefore, it is an object of the invention to propose a kind of weak radar pulse envelope signal detecting method and device.
To achieve these goals, the embodiment of one aspect of the present invention provides a kind of weak radar pulse envelope signal detection side
Method, comprises the following steps：
Step S1, the radar signal to input carries out digital channelizing processing, including：Using many phase band pass filter groups pair
The radar signal of input is extracted and filtered, and exported after Fourier's FFT the sample point of multiple channels, to realize
Digital channelizing processing；
Step S2, the I Q form signals after being handled according to digital channelizing, calculating obtains multiple signals amplitude, and
It is signal envelope that same time point, which extracts signal amplitude maximum,；
Whether step S3, using the pulse detection algorithm based on channel number, connect to obtained signal envelope according to channelizing
It is continuous to carry out pulse detection, to ensure to detect weak radar pulse signal.
Further, it is described handled according to digital channelizing after I Q form signals, calculating obtain multiple signals amplitude, wrap
Include：
| Y |=max (| L |+(1/8+1/32) | S |, (1-1/8-1/32) | L |+(1/2+1/16-1/128) | S |)
Wherein, | L |=max (| YI |, | YQ |), | S |=min (| YI |, | YQ |), YI is signal I values, and YQ is signal Q values.
Further, in the step S3, whether described pair of obtained signal envelope is carried out continuously pulse according to channelizing
Detection, including：
Affected by noise when the external world does not have signal, the channel number of envelope signal has randomness, is discontinuous；
When the external world has pulse signal, the channel number of envelope signal has continuity；
Whether pulse signal can continuously be judged whether according to the channel number of envelope signal.
Further, if current channel number is ci, then think that current channel number connects when current channel number meets following condition
It is continuous：
| ci-ci-j |≤1 (0≤j≤N) or | ci-ci+j |≤1 (0≤j≤N)
It is more or less the same when signal envelope has continuous N number of sampled point channel number in 1 when, that is, it is pulse letter to think current demand signal
Number, wherein, N is variable.
The embodiment of the present invention also proposes a kind of weak radar pulse envelope signal supervisory instrument, including：Digital channelizing module,
Signal envelope extraction module and the pulse detection module based on channel number, wherein,
The digital channelizing module is used to carry out digital channelizing processing to the radar signal of input, including：Using many
Phase band pass filter group is extracted and filtered to the radar signal of input, and carries out exporting multiple letters after Fourier's FFT
The sample point in road, to realize that digital channelizing is handled；
The signal envelope extraction module is used for the I Q form signals after being handled according to digital channelizing, and calculating obtains many
Road signal amplitude, and it is signal envelope to extract signal amplitude maximum at same time point；
The pulse detection module based on channel number uses the pulse detection algorithm based on channel number, to obtained signal
Whether envelope is carried out continuously pulse detection according to channelizing, to ensure to detect weak radar pulse signal.
Further, the digital channelizing module is realized using the multiphase phase band pass filter group of even permutation, critical extraction
Digital channelizing processing.
Further, the I Q form signals after the signal envelope extraction module is handled according to digital channelizing, calculating is obtained
Multiple signals amplitude, including：
| Y |=max (| L |+(1/8+1/32) | S |, (1-1/8-1/32) | L |+(1/2+1/16-1/128) | S |)
Wherein, | L |=max (| YI |, | YQ |), | S |=min (| YI |, | YQ |), YI is signal I values, and YQ is signal Q values.
Further, whether the pulse detection module based on channel number is continuous according to channelizing to obtained signal envelope
Pulse detection is carried out, including：
Affected by noise when the external world does not have signal, the channel number of envelope signal has randomness, is discontinuous；
When the external world has pulse signal, the channel number of envelope signal has continuity；
Whether pulse signal can continuously be judged whether according to the channel number of envelope signal.
Further, the pulse detection module based on channel number sets current channel number as ci, then current channel number is met
Think that current channel number is continuous during following condition：
| ci-ci-j |≤1 (0≤j≤N) or | ci-ci+j |≤1 (0≤j≤N)
It is more or less the same when signal envelope has continuous N number of sampled point channel number in 1 when, that is, it is pulse letter to think current demand signal
Number, wherein, N is variable.
Weak radar pulse envelope signal detecting method and device according to embodiments of the present invention, external radar signals are carried out
Channelizing is handled, and can filter out out-of-band noise, improves Signal-to-Noise；Carried by carrying out envelope to the signal after channelizing
Take, the number of channel that rear end needs to detect can be reduced, detection speed is improved, reduce resource consumption, and can solve the problem that broadband is believed
Number across channel fragmentation problem；By using the pulse detection algorithm based on channel number, signal detection can be further improved sensitive
Degree, and ensure to detect complete pulse signal.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 is the flow chart of the weak radar pulse envelope signal detecting method according to the embodiment of the present invention；
Fig. 2 is the structure chart of the weak radar pulse envelope signal supervisory instrument according to the embodiment of the present invention；
Fig. 3 is the digital channelizing schematic diagram based on multiphase filter structure according to the embodiment of the present invention；
Fig. 4 is the multiplex (MUX) signal exemplary plot after the WBFM signal channellization according to the embodiment of the present invention；
Fig. 5 is the complete signal envelope after the WBFM signal multiplex (MUX) envelope extraction according to the embodiment of the present invention
Exemplary plot；
Fig. 6 is the pulse detection design sketch based on channel number according to the embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
As shown in figure 1, the weak radar pulse envelope signal detecting method of the embodiment of the present invention, comprises the following steps：
Step S1, the radar signal to input carries out digital channelizing processing, including：Using many phase band pass filter groups pair
The radar signal of input is extracted and filtered, and exported after Fourier's FFT the sample point of multiple channels, to realize
Digital channelizing processing.
In one embodiment of the invention, number is realized using the multiphase phase band pass filter group of even permutation, critical extraction
Word channelizing is handled, to filter out the noise outside channel.
Specifically, realize that digital channelizing is handled using the multiphase phase band pass filter group of even permutation, critical extraction.To defeated
Enter radar signal using one group of performance identical bandpass filter group, original full range band signal is divided into multiple sub-bands and believed
Number.Digital channelizing has a kind of efficient implementation method, the i.e. channelization structure based on multiphase filter group.
As shown in figure 3, even permutation, critical extraction multiphase filter structure shown in figure for complex signal, main process is first
D times is carried out to input signal to extract, is then filtered to extracting signal, eventually passes the sample that D points FFT exports D channel
Point.The present embodiment realizes digital channelizing using even permutation, the multiphase filter structure of critical extraction.
Step S2, the I Q form signals after being handled according to digital channelizing, calculating obtains multiple signals amplitude, and
It is signal envelope that same time point, which extracts signal amplitude maximum,.
Signal envelope extraction process mainly includes two steps：Channel signal envelope is calculated and channel signal envelope extraction.Due to
The signal of digital channelizing module output for I Q forms, it is necessary to switch to signal amplitude, subsequent treatment, channel signal could be used for
Envelope, which calculates to be calculated according to signal I Q, obtains signal amplitude.
Specifically, the I Q form signals after being handled according to digital channelizing, calculating obtains multiple signals amplitude, including：
| Y |=max (| L |+(1/8+1/32) | S |, (1-1/8-1/32) | L |+(1/2+1/16-1/128) | S |)
Wherein, | L |=max (| YI |, | YQ |), | S |=min (| YI |, | YQ |), YI is signal I values, and YQ is signal Q values.
Fig. 4 is that a WBFM signal calculates obtained multiplex (MUX) signal width by channelizing processing and amplitude
Degree.Figure includes a plurality of different channel, it can be seen that single wideband pulse has output in multiple channels.
Channel signal envelope extraction algorithm calculates obtained multiplex (MUX) signal amplitude according to step S1, at same time point
Extract signal amplitude maximum, as signal envelope.The signal carried out to Fig. 3 after Amplitude maxima extraction is shown in Fig. 4
Envelope diagram, it can be seen that by after envelope extraction, complete pulse signal is formd in signal envelope.
Whether step S3, using the pulse detection algorithm based on channel number, connect to obtained signal envelope according to channelizing
It is continuous to carry out pulse detection, to ensure to detect weak radar pulse signal.
Specifically, whether pulse detection is carried out continuously according to channelizing to obtained signal envelope, including：
Affected by noise when the external world does not have signal, the channel number of envelope signal has randomness, is usually discontinuous
's；And when the external world has pulse signal, the channel number of envelope signal has continuity, according to this feature, i.e., believed according to envelope
Number channel number whether continuously i.e. can judge whether pulse signal.
Wherein, judge that the whether continuous number of channel number is set to N, if current channel number is ci, then current channel number is expired
Think that current channel number is continuous during sufficient following condition：
| ci-ci-j |≤1 (0≤j≤N) or | ci-ci+j |≤1 (0≤j≤N)
It is more or less the same when signal envelope has continuous N number of sampled point channel number in 1 when, that is, it is pulse letter to think current demand signal
Number, wherein, N is variable.
Fig. 6 shows the channel number testing result for the envelope signal that Fig. 5 is represented.The asterisk that wherein A is pointed to represents signal bag
The channel number of network, the lines that B is pointed to represent to carry out the result of pulse detection according to the continuity criterion of channel number.The line that B is pointed to
In bar, 0 represents noise, and non-zero expression detects pulse signal.It can be seen that whether continuously can be accurate according to channel number
Really detect pulse signal.Compared with conventional amplitude detection method, the advantage of the method can improve signal detection
Sensitivity.Amplitude detection is typically only capable to the pulse signal that detection signal-to-noise ratio is more than 13db, can be examined using channel number continuation algorithm
Measure the pulse signal that signal to noise ratio is less than 10db.
The key technical indexes of the present invention is relevant with parameter setting, can reach following index：When using 128 digital channels
During change, the wideband linear frequency modulated radar pulse signal and ordinary radar pulse letter of -8db signal to noise ratio can be accurately detected
Number.
As shown in Fig. 2 the embodiment of the present invention also proposes a kind of weak radar pulse envelope signal supervisory instrument, including：Numeral
Channelization block 100, signal envelope extraction module 200 and the pulse detection module 300 based on channel number.
Specifically, digital channelizing module 100 is used to carry out digital channelizing processing to the radar signal of input, including：
The radar signal of input is extracted and filtered using many phase band pass filter groups, and exported after Fourier's FFT
The sample point of multiple channels, to realize that digital channelizing is handled.
In one embodiment of the invention, digital channelizing module 100 is using even permutation, the multiphase facies tract of critical extraction
Bandpass filter group realizes that digital channelizing is handled.
Specifically, digital channelizing module 100 realizes number using even permutation, the multiphase phase band pass filter group of critical extraction
Word channelizing is handled.To input radar signal using one group of performance identical bandpass filter group, by original full range band signal point
It is segmented into multiple sub-band signals.Digital channelizing has a kind of efficient implementation method, the i.e. channelizing based on multiphase filter group
Structure.
As shown in figure 3, even permutation, critical extraction multiphase filter structure shown in figure for complex signal, main process is first
D times is carried out to input signal to extract, is then filtered to extracting signal, eventually passes the sample that D points FFT exports D channel
Point.The present embodiment realizes digital channelizing using even permutation, the multiphase filter structure of critical extraction.
Signal envelope extraction module 200 is used for the I Q form signals after being handled according to digital channelizing, and calculating obtains multichannel
Signal amplitude, and it is signal envelope to extract signal amplitude maximum at same time point.
Signal envelope extraction process mainly includes two steps：Channel signal envelope is calculated and channel signal envelope extraction.Due to
The signal that digital channelizing module 100 is exported for I Q forms, it is necessary to switch to signal amplitude, subsequent treatment, channel letter could be used for
Number envelope, which calculates to be calculated according to signal I Q, obtains signal amplitude.
Specifically, the I Q form signals after signal envelope extraction module 200 is handled according to digital channelizing, calculating is obtained
Multiple signals amplitude, including：
| Y |=max (| L |+(1/8+1/32) | S |, (1-1/8-1/32) | L |+(1/2+1/16-1/128) | S |)
Wherein, | L |=max (| YI |, | YQ |), | S |=min (| YI |, | YQ |), YI is signal I values, and YQ is signal Q values.
Fig. 4 is that a WBFM signal calculates obtained multiplex (MUX) signal width by channelizing processing and amplitude
Degree.Figure includes a plurality of different channel, it can be seen that single wideband pulse has output in multiple channels.
Channel signal envelope extract block 200 is extracted at same time point and believed according to obtained multiplex (MUX) signal amplitude
Number Amplitude maxima, as signal envelope.The signal envelope figure carried out to Fig. 3 after Amplitude maxima extraction is shown in Fig. 4,
It can be seen that after envelope extraction, complete pulse signal is formd in signal envelope.
Pulse detection module 300 based on channel number uses the pulse detection algorithm based on channel number, to obtained signal
Whether envelope is carried out continuously pulse detection according to channelizing, to ensure to detect weak radar pulse signal.
Specifically, whether the signal envelope that 300 pairs of the pulse detection module based on channel number is obtained is continuous according to channelizing
Pulse detection is carried out, including：
Affected by noise when the external world does not have signal, the channel number of envelope signal has randomness, is usually discontinuous
's；And when the external world has pulse signal, the channel number of envelope signal has continuity, according to this feature, i.e., believed according to envelope
Number channel number whether continuously i.e. can judge whether pulse signal.
Wherein, judge that the whether continuous number of channel number is set to N, if current channel number is ci, then current channel number is expired
Think that current channel number is continuous during sufficient following condition：
| ci-ci-j |≤1 (0≤j≤N) or | ci-ci+j |≤1 (0≤j≤N)
It is more or less the same when signal envelope has continuous N number of sampled point channel number in 1 when, that is, it is pulse letter to think current demand signal
Number, wherein, N is variable.
Fig. 6 shows the channel number testing result for the envelope signal that Fig. 5 is represented.The asterisk that wherein A is pointed to represents signal bag
The channel number of network, the lines that B is pointed to represent to carry out the result of pulse detection according to the continuity criterion of channel number.The line that B is pointed to
In bar, 0 represents noise, and non-zero expression detects pulse signal.It can be seen that whether continuously can be accurate according to channel number
Really detect pulse signal.Compared with conventional amplitude detection method, the advantage of the method can improve signal detection
Sensitivity.Amplitude detection is typically only capable to the pulse signal that detection signal-to-noise ratio is more than 13db, can be examined using channel number continuation algorithm
Measure the pulse signal that signal to noise ratio is less than 10db.
Weak radar pulse envelope signal detecting method and device according to embodiments of the present invention, external radar signals are carried out
Channelizing is handled, and can filter out out-of-band noise, improves Signal-to-Noise；Carried by carrying out envelope to the signal after channelizing
Take, the number of channel that rear end needs to detect can be reduced, detection speed is improved, reduce resource consumption, and can solve the problem that broadband is believed
Number across channel fragmentation problem；By using the pulse detection algorithm based on channel number, signal detection can be further improved sensitive
Degree, and ensure to detect complete pulse signal.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art is not departing from the principle and objective of the present invention
In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.The scope of the present invention
By appended claims and its equivalent limit.
Claims (10)
1. a kind of weak radar pulse envelope signal detecting method, it is characterised in that comprise the following steps：
Step S1, the radar signal to input carries out digital channelizing processing, including：Using many phase band pass filter groups to input
Radar signal extracted and filtered, and exported after Fourier's FFT the sample point of multiple channels, to realize numeral
Channelizing is handled；
Step S2, the I Q form signals after being handled according to digital channelizing, calculating obtains multiple signals amplitude, and same
It is signal envelope that time point, which extracts signal amplitude maximum,；
Whether step S3, using the pulse detection algorithm based on channel number, continuously enter to obtained signal envelope according to channelizing
Horizontal pulse is detected, to ensure to detect weak radar pulse signal.
2. weak radar pulse envelope signal detecting method as claimed in claim 1, it is characterised in that in the step S1,
Realize that digital channelizing is handled using the multiphase phase band pass filter group of even permutation, critical extraction.
3. weak radar pulse envelope signal detecting method as claimed in claim 1, it is characterised in that in the step S2,
It is described handled according to digital channelizing after I Q form signals, calculating obtain multiple signals amplitude, including：
| Y |=max (| L |+(1/8+1/32) | S |, (1-1/8-1/32) | L |+(1/2+1/16-1/128) | S |)
Wherein, | L |=max (| YI |, | YQ |), | S |=min (| YI |, | YQ |), YI is signal I values, and YQ is signal Q values.
4. weak radar pulse envelope signal detecting method as claimed in claim 1, it is characterised in that in the step S3,
In the step S3, whether described pair of obtained signal envelope is carried out continuously pulse detection according to channelizing, including：
Affected by noise when the external world does not have signal, the channel number of envelope signal has randomness, is discontinuous；
When the external world has pulse signal, the channel number of envelope signal has continuity；
Whether pulse signal can continuously be judged whether according to the channel number of envelope signal.
5. weak radar pulse envelope signal detecting method as claimed in claim 1, it is characterised in that in the step S3,
If current channel number is ci, then think that current channel number is continuous when current channel number meets following condition：
| ci-ci-j |≤1 (0≤j≤N) or | ci-ci+j |≤1 (0≤j≤N)
It is more or less the same when signal envelope has continuous N number of sampled point channel number in 1 when, that is, it is pulse signal to think current demand signal,
Wherein, N is variable.
6. a kind of weak radar pulse envelope signal supervisory instrument, it is characterised in that including：Digital channelizing module, signal envelope
Extraction module and the pulse detection module based on channel number, wherein,
The digital channelizing module is used to carry out digital channelizing processing to the radar signal of input, including：Using many facies tracts
Bandpass filter group is extracted and filtered to the radar signal of input, and carries out exporting multiple channels after Fourier's FFT
Sample point, to realize that digital channelizing is handled；
The signal envelope extraction module is used for the I Q form signals after being handled according to digital channelizing, and calculating obtains multichannel letter
Number amplitude, and it is signal envelope to extract signal amplitude maximum at same time point；
The pulse detection module based on channel number uses the pulse detection algorithm based on channel number, to obtained signal envelope
Whether pulse detection is carried out continuously according to channelizing, to ensure to detect weak radar pulse signal.
7. weak radar pulse envelope signal supervisory instrument as claimed in claim 6, it is characterised in that the digital channelizing mould
Block realizes that digital channelizing is handled using even permutation, the multiphase phase band pass filter group of critical extraction.
8. weak radar pulse envelope signal supervisory instrument as claimed in claim 6, it is characterised in that the signal envelope is extracted
Module handled according to digital channelizing after I Q form signals, calculating obtain multiple signals amplitude, including：
| Y |=max (| L |+(1/8+1/32) | S |, (1-1/8-1/32) | L |+(1/2+1/16-1/128) | S |)
Wherein, | L |=max (| YI |, | YQ |), | S |=min (| YI |, | YQ |), YI is signal I values, and YQ is signal Q values.
9. weak radar pulse envelope signal supervisory instrument as claimed in claim 6, it is characterised in that described based on channel number
Whether pulse detection module is carried out continuously pulse detection to obtained signal envelope according to channelizing, including：
Affected by noise when the external world does not have signal, the channel number of envelope signal has randomness, is discontinuous；
When the external world has pulse signal, the channel number of envelope signal has continuity；
Whether pulse signal can continuously be judged whether according to the channel number of envelope signal.
10. weak radar pulse envelope signal supervisory instrument as claimed in claim 6, it is characterised in that described to be based on channel number
Pulse detection module set current channel number as ci, then think when current channel number meets following condition current channel number connect
It is continuous：
| ci-ci-j |≤1 (0≤j≤N) or | ci-ci+j |≤1 (0≤j≤N)
It is more or less the same when signal envelope has continuous N number of sampled point channel number in 1 when, that is, it is pulse signal to think current demand signal,
Wherein, N is variable.
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| CN109490848A (en) * | 2018-11-07 | 2019-03-19 | 国科电雷(北京)电子装备技术有限公司 | A kind of length radar pulse signal detection method based on two-stage channelizing |
| CN109490848B (en) * | 2018-11-07 | 2021-01-01 | 国科电雷(北京)电子装备技术有限公司 | Long and short radar pulse signal detection method based on two-stage channelization |
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Application publication date: 20171107 |