CN109407066A - The modulation /demodulation verification method and its equivalent model of radar signal - Google Patents
The modulation /demodulation verification method and its equivalent model of radar signal Download PDFInfo
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- CN109407066A CN109407066A CN201811582720.8A CN201811582720A CN109407066A CN 109407066 A CN109407066 A CN 109407066A CN 201811582720 A CN201811582720 A CN 201811582720A CN 109407066 A CN109407066 A CN 109407066A
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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
- G01S7/4056—Means for monitoring or calibrating by simulation of echoes specially adapted to FMCW
-
- 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
-
- 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
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
- G01S7/4065—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder involving a delay line
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention provides the modulation /demodulation verification method and its equivalent model of a kind of radar signal, and wherein signal source module provides linear FM signal；Fundamental frequency signal module is for providing fundamental frequency signal；The output end of the input terminal connection signal source module of first frequency multiplier；The input terminal of first frequency mixer is separately connected the output end of the first frequency multiplier and the output end of fundamental frequency signal module, the input terminal of the output end connection bandpass filter of the first frequency mixer, the bandpass filter output and frequency signal；The output end of the input terminal connection bandpass filter of second frequency multiplier, obtains two paths of signals for carrying out frequency multiplication to described and frequency signal, wherein being used as radar emission signal all the way, launches from antenna；In addition all the way by transmission delay as radar return；The two paths of signals solution is transferred to low-frequency range by demodulation module.The present invention overcomes the disadvantages of Terahertz radar system is cumbersome is actually built, coherent detection data can be rapidly verified and be calculated, are compared with theoretical value.
Description
Technical field
The present invention relates to field of signal processing, and in particular to a kind of the modulation /demodulation verification method and radar letter of radar signal
Number modulation /demodulation emulates equivalent model.
Background technique
THz wave is often referred to electromagnetic wave of the frequency between 0.1THz~10THz (30 μm~3mm of corresponding wavelength), frequency
Rate is between millimeter wave and infrared light.THz wave frequency is higher, is difficult to detect, so that THz wave becomes in electromagnetic spectrum
The last one frequency window do not studied and utilized comprehensively, referred to as " Terahertz gap ".Due to Terahertz frequency range wavelength degree
Less than microwave, millimeter wave, Terahertz radar is more easily implemented large signal bandwidth and narrow antenna beam, is also beneficial to carry out target
High-resolution imaging.Meanwhile the Doppler effect caused by Terahertz frequency range object of which movement is more significant, is also beneficial to target fortune
The detection identification of dynamic even fine motion feature.But since Terahertz frequency range device and integrated technology are still immature, in Terahertz thunder
Up in system development or build process, system integration project can shift to an earlier date the reasonability and correctness of test and verification system schema,
Convenient for parts selection, error anticipation and risk control, have a very important significance.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of modulation /demodulation verification method of radar signal
And its equivalent model.
The technical solution provided according to the present invention, as the first aspect of the present invention the modulation /demodulation authentication of a kind of signal
Method, the modulation /demodulation verification method of the signal is specifically includes the following steps: step 1: be modulated signal；Step 2: right
The signal modulated in the first step is demodulated；Step 3: the signal that verifying demodulates meets the equivalent signal of THz wave；
Signal is modulated specifically includes the following steps:
S110: linear FM signal is subjected to frequency multiplication；
S120: it carries out the linear FM signal after frequency multiplication to be mixed output CW with frequency modulation with fundamental frequency signal；
S130: output and frequency signal are filtered to the CW with frequency modulation；
S140: frequency multiplication is carried out to described and frequency signal and obtains radar emission signal radar emission signal, the radar is sent out
Signal is penetrated to launch from antenna；
S150: simulation receives the radar emission signal, and the radar emission signal is obtained by transmission delay module
Radar echo signal；
The signal modulated in the first step is demodulated specifically includes the following steps:
S210: receiver receives radar echo signal, and received radar echo signal is separated to mutually orthogonal
Two channels in；
S220: the receiver includes same phase channel and inverted channel, in the positive channel of the receiver, the thunder
It is mixed to obtain difference frequency signal with radar emission signal up to echo-signal；
S230: difference frequency signal progress low-pass filtering is obtained into intermediate-freuqncy signal；
Verify the signal that demodulates meet THz wave equivalent signal specifically includes the following steps:
S310: the radar emission signal that S140 is obtained passes through first time transmission delay respectively, second of transmission is prolonged
Slow and third time transmission delay is prolonged to respectively obtain the first transmission delay signal, the second transmission delay signal and third transmission
Slow signal；
S320: the first transmission delay signal is mixed with radar emission signal, then by the mixed frequency signal through too low
Pass filter obtains the first difference frequency signal；First difference frequency signal is made into low-frequency sampling, observes frequency spectrum；
S330: third transmission delay signal is mixed with radar emission signal, then by the mixed frequency signal through too low
Pass filter obtains the second difference frequency signal；Second difference frequency signal is made into low-frequency sampling, observes frequency spectrum；
S340: by the first transmission delay signal and the second transmission delay signal phase adduction by the signal and radar emission of output
Signal is mixed, then the signal of mixing is obtained third difference frequency signal by low-pass filtering；Third difference frequency signal is made into low frequency
Frequency spectrum is observed in sampling.
Further, the mathematic(al) representation of linear FM signal described in S110 step are as follows:
In formula: A is amplitude；The rectangular window for being τ for a width；F0 is original frequency；K is frequency modulation rate；Institute
Stating linear FM signal is the sine wave that frequency changes linearly over time, and the linear FM signal can be in the period of 1ms
It is interior by 300MHz linear increase to 550MHz, and the bandwidth of the linear FM signal is 250MHz；The linear frequency modulation letter
After number frequency multiplication, by 600MHz linear increase to 1100MHz, bandwidth 500MHz within the period of 1ms.
Further, the frequency of the fundamental frequency signal is 3.65GHz.
Further, bandpass filter described in S130 uses 16 ranks, the bandpass filter of 4GHz to 5GHz.
Further, described and frequency signal is the linear frequency modulation sine wave signal of 4.25GHz-4.75GHz.
Further, the radar emission signal is the linear frequency modulation sine wave of 8.5GHz-9.5GHz；The radar return
Signal is also the linear frequency modulation sine wave of 8.5GHz-9.5GHz, and the radar echo signal is sent out relative to the radar
Penetrating signal, there are time delays.
As a second aspect of the invention, a kind of modulating and demodulating signal emulation equivalent model, the signal modulation solution are provided
Tune emulates equivalent model
Signal source module, the signal source module provide linear FM signal；
Fundamental frequency signal module, the fundamental frequency signal module is for providing fundamental frequency signal；
First frequency multiplier, the output end of the input terminal connection signal source module of first frequency multiplier, for signal source
The linear FM signal that module generates carries out frequency multiplication；
The input terminal of first frequency mixer, first frequency mixer is separately connected the output end and fundamental frequency signal of the first frequency multiplier
The output end of module, the input terminal of the output end connection bandpass filter of the first frequency mixer, the bandpass filter output and frequency
Signal；
Second frequency multiplier, the output end of the input terminal connection bandpass filter of second frequency multiplier, for described and
Frequency signal carries out frequency multiplication and obtains two paths of signals radar emission signal, wherein launching all the way from antenna；In addition all the way by passing
Defeated delay is used as radar return；
The two paths of signals solution is transferred to low-frequency range by demodulation module, the demodulation module.
Further, first frequency mixer includes multiplier, and the input terminal of the multiplier is first frequency mixer
Input terminal, multiplier output end connection bandpass filter input terminal
Further, the demodulation module be I/Q quadrature demodulation unit it include first passage and second channel, it is described
First passage and second channel are mutually orthogonal, and the second frequency mixer and first filter, second mixing are equipped in first passage
The input terminal of device inputs radar emission signal and radar echo signal, the first filter of output end connection of second frequency mixer respectively
The input terminal of wave device.
It further, further include that the radar resolution connecting with modulating and demodulating signal emulation equivalent model verifies mould
Group, the radar resolution verifying mould group include:
Transmission delay module, the transmission delay module include the first transmission delay module, the second transmission delay module and
Third transmission delay module, the input terminal and third of the input terminal of the first transmission delay module, the second transmission delay module
The input terminal of transmission delay module is all connected with the output end of second frequency multiplier, for receiving the thunder of the second frequency multiplier output
Up to transmitting signal；
Third frequency mixer, the input terminal of the third frequency mixer are separately connected the output end and of the first transmission delay module
The output end of the output end of varactor doubler, the third frequency mixer connects second filter；The output end of the second filter
The input terminal of low-frequency sampling device is connected, frequency spectrograph connects the output end of the low-frequency sampling device；
4th frequency mixer, the input terminal of the 4th frequency mixer are separately connected the output end and of third transmission delay module
The output end of varactor doubler, the output end of the 4th frequency mixer connect the input terminal of a second filter；Second filtering
The input terminal of the output end connection low-frequency sampling device of device, frequency spectrograph connect the output end of the low-frequency sampling device；
Adder, the input terminal of the adder is separately connected the output end of the first transmission delay module and the second transmission is prolonged
The output end of slow module；
The input terminal of 5th frequency mixer, the 5th frequency mixer is separately connected the output end and the second frequency multiplication of the adder
The output end of device, the output end of the 5th frequency mixer connect the input terminal of a second filter；The second filter it is defeated
Outlet connects the input terminal of low-frequency sampling device, and frequency spectrograph connects the output end of the low-frequency sampling device.
From the modulation /demodulation verification method and its equivalent mould described above that can be seen that radar signal provided by the invention
Type has following advantages compared with prior art: first, since Terahertz linear FM radar is in high band, it is difficult to extract
A series of information, so being mainly mixed using the method for frequency reducing by frequencys multiplication, filtering, the processing such as modulation /demodulation.It is extracted transmission
Time delay, the information such as time domain waveform.Simulation result is almost the same with theoretical value.Terahertz thunder is actually built second, overcoming
The disadvantages of cumbersome up to system, can rapidly verify and calculate coherent detection data, compare with theoretical value.
Detailed description of the invention
Fig. 1 is the flow chart of signal modulating method in the present invention.
Fig. 2 is the flow chart of signal demodulating method in the present invention.
Fig. 3 is the structure principle chart that modulating and demodulating signal emulates equivalent model in the present invention.
Fig. 4 is the flow chart of the verification method of radar resolution in the present invention.
Fig. 5 is the structural schematic diagram of the verifying model of radar resolution in the present invention.
1. signal source module, 2. fundamental frequency signal modules, 3. first frequency multipliers, 4. first frequency mixers, 5. bandpass filters, 6.
Second frequency multiplier, 7. second frequency mixers, 8. first filters, 9. first transmission delay modules, 10. second transmission delay modules,
11. third transmission delay module, 12. third frequency mixers, 13. the 4th frequency mixers, 14. adders, 15. the 5th frequency mixers, 16. is low
Pass filter, 17. low-frequency sampling devices, 18. frequency spectrographs.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.Wherein identical components are presented with like reference characters.
Simulink provides signal processing module abundant in numerous simulation softwares, the images outputting provided convenience
Interface, and it is easy to operate, and cost is relatively low, is easy to be multiplexed, therefore select Simulink as certain ultra wide band Terahertz thunder herein
Emulation tool up to range-measurement system builds mathematical model, and can verifying extrapolate transmission delay by the frequency of the radar echo signal
Information.Since the system emulation is that radar signal is moved tremendously low frequency section from high band and is convenient for research in fact.It is opened herein just
It is to use 300MHz-331.25MHz, bandwidth is the linear frequency modulation sine wave and 7.86875GHz of 31.25MHz before beginning system modelling
Sine wave make 2 frequencys multiplication, mixing, filtering processing obtain the linear frequency modulation sine wave of 135.5GHz to 136.5GHz.But in reality
During system emulation, it is found that the key of emulation is to extract the information of the road I signal (in-phase signal) after demodulation.Using
The linear frequency modulation sine wave of 300MHz-550MHz and the sine wave of 3.65GHz make 2 frequencys multiplication, mixing, and filtering processing obtains
The linear frequency modulation sine wave of 8.5GHz-9.5GHz can equally reach effect.A kind of equivalent model of 8G left-right signal can be taken.
As the first aspect of the present invention, a kind of modulation /demodulation verification method of signal is provided comprising walk in detail below
It is rapid: step 1: being modulated to signal, second step, the signal modulated in the first step being demodulated；Third step, verifying are solved
Obtained signal is adjusted to meet the equivalent signal of THz wave.
Being modulated to signal for the first step specifically includes following below scheme:
S110: linear FM signal is subjected to frequency multiplication；The mathematic(al) representation of the linear FM signal are as follows:
In formula: A is amplitude；The rectangular window for being τ for a width；f0For original frequency；K is frequency modulation rate.The line
Property FM signal be the sine wave that changes linearly over time of frequency, the linear FM signal can within the period of 1ms by
300MHz linear increase is to 550MHz, and the bandwidth of the linear FM signal is 250MHz；The linear FM signal times
It, can be by 600MHz linear increase to 1100MHz, bandwidth 500MHz within the period of 1ms after frequency.
S120: it carries out the linear FM signal after frequency multiplication to be mixed one CW with frequency modulation of output with fundamental frequency signal；It is described
The frequency of fundamental frequency signal is 3.65GHz；
S130: so that the CW with frequency modulation is filtered and exports and frequency signal by bandpass filter 5；The band logical
Preferably 16 ranks of filter 5, the bandpass filter 5 of 4GHz to 5GHz, the bandpass filter 5, filter effect is good.Described and frequency
Signal is the linear frequency modulation sine wave signal of 4.25GHz-4.75GHz.
Mixing and filtering step described in S120 the and S130 step specifically includes: now by the linear FM signal after frequency multiplication
It is multiplied with fundamental frequency signal through multiplier, carries out bandpass filtering then to obtain described and frequency signal.
S140: carrying out frequency multiplication to described and frequency signal and obtain radar emission signal, and by the radar emission signal from day
Line is launched.Specifically, according to " signal that an original frequency is f is by a series of available random frequency multiplications that are multiplied
The principle of signal " carries out 1 process of frequency multiplication to it using phase multiplication during carrying out frequency multiplication to described and frequency signal.
Radar emission signal described in the S140 step is the linear frequency modulation sine wave of 8.5GHz-9.5GHz.
S150: simulation receives the radar emission signal.The radar emission signal is obtained by transmission delay module
Radar echo signal；The radar echo signal linear frequency modulation for being 8.5GHz-9.5GHz identical as radar emission signal is just
String wave；The transmission delay module simulation has carried out the transmission delay of 10us to the radar emission signal.And it will be received
Radar echo signal be separated in two mutually orthogonal channels.
Second step to the signal modulated in the first step carry out demodulation specifically include following below scheme:
S210: receiver receives radar echo signal, and received radar echo signal is separated to mutually orthogonal
Two channels in；
S220: the receiver includes same phase channel and inverted channel, in the positive channel of the receiver, the thunder
It is mixed to obtain difference frequency signal with radar emission signal up to echo-signal.
S230: difference frequency signal progress low-pass filtering is obtained into intermediate-freuqncy signal.
Radar emission signal is mixed with the radar echo signal Jing Guo 10us transmission delay, using the first of 125M
Filter 8 obtains difference frequency signal in positive channel.Since in the period linear increase 1GHz of 1ms, for 10us
Transmission delay, theoretically, the difference frequency signal that can be obtained is the sine wave of 10M.
Third step verifies the signal demodulated and meets the equivalent signal of THz wave specifically includes the following steps: repairing
Change the propagation delay time of the transmission delay module.
Specifically, the propagation delay time of the transmission delay module is revised as 5us, repeats the above steps to obtain
The difference frequency signal of about 4.9MHz.The propagation delay time of the transmission delay module is revised as 8us, repeat the above steps to
Obtain the difference frequency signal of about 8.1MHz.The propagation delay time of the transmission delay module is revised as 15us, repeats above-mentioned step
Suddenly to obtain the difference frequency signal of about 15.0MHz.The propagation delay time of the transmission delay module is revised as 20us, is repeated
Above-mentioned steps are to obtain the difference frequency signal of about 20.1MHz.
As a second aspect of the invention, a kind of modulating and demodulating signal emulation equivalent model is provided comprising:
Signal source module 1, the signal source module 1 provide linear FM signal；The mathematical table of the linear FM signal
Up to formula are as follows:
In formula: A is amplitude；The rectangular window for being τ for a width；f0For original frequency；K is frequency modulation rate.The line
Property FM signal is within the period of 1ms by 300MHz linear increase to 550MHz, bandwidth 250MHz.
Fundamental frequency signal module 2, the fundamental frequency signal module 2 is for providing fundamental frequency signal；
First frequency multiplier 3, the output end of the input terminal connection signal source module 1 of first frequency multiplier 3；Described first times
The linear FM signal that frequency device 3 is used to generate signal source module 1 carries out frequency multiplication, and in 1ms, (period is interior linear by 600MHz
Rise to 1100MHz, bandwidth 500MHz.
First frequency mixer 4, the input terminal of first frequency mixer 4 are separately connected the output end and fundamental frequency of the first frequency multiplier 3
The output end of signaling module 2；First frequency mixer 4 includes multiplier, and the input terminal of the multiplier is first mixing
The input terminal of device 4, multiplier output end connection bandpass filter 5 input terminal, through the bandpass filter 5 filtering obtain and
Frequency signal.
Second frequency multiplier 6, the output end of the input terminal connection bandpass filter 5 of second frequency multiplier 6；For to described
16 frequencys multiplication are carried out with frequency signal, to obtain two paths of signals, wherein being used as radar emission signal all the way, are launched from antenna；
In addition all the way by the transmission delay of 10us as radar return.
Demodulation module, the demodulation module are I/Q quadrature demodulation unit.The demodulated module solution of two paths of signals is transferred to
Low-frequency range.To complete signal demodulation.The demodulation module includes first passage and second channel, the first passage and second
Channel is mutually orthogonal, and the second frequency mixer 7 and first filter 8, the input terminal point of second frequency mixer 7 are equipped in first passage
Not Shu Ru radar emission signal and radar echo signal, second frequency mixer 7 output end connection first filter 8 input
End.
As the third aspect of the present invention, a kind of verification method of radar resolution is provided, wherein as shown in figure 4, according to
Radar calculation formula:
2*R (radar one way distance)=c (light velocity) * t (transmission time)
P (radar resolution)=c (light velocity)/(2*B (radar signal bandwidth))
The resolution ratio for the linear FM radar that bandwidth is 1GHz is 0.15m (being converted into transmission delay is 1ns).The radar
The verification method of resolution ratio the following steps are included:
S310: the first aspect present invention first step S140 obtained radar emission signal passes through the first transmission respectively and prolongs
Slow module 9, the second transmission delay module 10 and third transmission delay module 11 carry out first time transmission delay, second pass respectively
Defeated delay and third time transmission delay pass to respectively obtain the first transmission delay signal, the second transmission delay signal and third
Defeated postpones signal.The transmission of the first transmission delay module 9, the second transmission delay module 10 and third transmission delay module 11
Delay time is respectively 10us, 10.0033us and 10.001us, so that the first transmission delay signal is to transmit by 10us
The linear frequency modulation sine wave of the 8.5GHz-9.5GHz of delay, the second transmission delay signal are to prolong by 10.0033us transmission
The linear frequency modulation sine wave of slow 8.5GHz-9.5GHz, the third transmission delay signal are by 10.001us transmission delay
8.5GHz-9.5GHz linear frequency modulation sine wave.
S320: the first transmission delay signal is mixed with radar emission signal, then by the mixed frequency signal through overfrequency
18 frequency spectrograph of spectrometer, 1816 device obtains the first difference frequency signal；First difference frequency signal is made low-frequency sampling (sample rate 30MHz), is seen
Examine frequency spectrum.
S330: third transmission delay signal is mixed with radar emission signal, then by the mixed frequency signal through overfrequency
18 frequency spectrograph of spectrometer, 1816 device obtains the second difference frequency signal；Second difference frequency signal is made low-frequency sampling (sample rate 30MHz), is seen
Examine frequency spectrum.
S340: by the first transmission delay signal and the second transmission delay signal phase adduction by the signal and radar emission of output
Signal is mixed, then the signal of mixing is obtained third difference frequency signal by 18 frequency spectrograph of frequency spectrograph, 1816 device；Third is poor
Frequency signal is made low-frequency sampling (sample rate 30MHz), and frequency spectrum is observed.The parameter of the frequency spectrograph is set as Span=24MHz, CF
=0Hz, RBW=2e3Hz.
As the fourth aspect of the present invention, a kind of verifying model of radar resolution is provided, wherein as shown in figure 5, described
The verifying model of radar resolution is used to verify the radar emission signal of the output of the second frequency multiplier 6 described in second aspect of the present invention
Resolution ratio, the verifying model of the radar resolution specifically includes:
Transmission delay module, the transmission delay module include the first transmission delay module 9, the second transmission delay module 10
With third transmission delay module 11, the input terminal of the input terminal of the first transmission delay module 9, the second transmission delay module 10
The output end of the second frequency multiplier 6 is all connected with the input terminal of third transmission delay module 11, for receiving the output of the second frequency multiplier 6
Radar emission signal.
Third frequency mixer 12, the input terminal of the third frequency mixer 12 are separately connected the output of the first transmission delay module 9
The output end of the output end at end and the second frequency multiplier 6, the third frequency mixer 12 connects 18 frequency spectrograph of frequency spectrograph, 1816 device；It is described
The input terminal of the output end connection low-frequency sampling device 17 of 18 frequency spectrograph of frequency spectrograph, 1816 device, frequency spectrograph connect the low-frequency sampling device
17 output end.
The input terminal of 4th frequency mixer 13, the 4th frequency mixer 13 is separately connected the output of third transmission delay module 11
The output end at end and the second frequency multiplier 6, output end connection one frequency spectrograph, 18 frequency spectrograph, 1816 device of the 4th frequency mixer 13
Input terminal；The input terminal of the output end connection low-frequency sampling device 17 of 18 frequency spectrograph of frequency spectrograph, 1816 device, frequency spectrograph connect institute
State the output end of low-frequency sampling device 17.
Adder 14, the input terminal of the adder 14 are separately connected the output end and second of the first transmission delay module 9
The output end of transmission delay module 10.
5th frequency mixer 15, the input terminal of the 5th frequency mixer 15 are separately connected the output end and of the adder 14
The output end of varactor doubler 6, the input terminal of output end connection one frequency spectrograph, 18 frequency spectrograph, 1816 device of the 5th frequency mixer 15；
The input terminal of the output end connection low-frequency sampling device 17 of 18 frequency spectrograph of frequency spectrograph, 1816 device, frequency spectrograph connect the low frequency and adopt
The output end of sample device 17.
4th the 4th frequency mixer of frequency mixer 13,13 13 frequency spectrograph of third transmission delay the 4th frequency mixer of module 11,18 frequency spectrograph
1816 frequency spectrograph, 18 frequency spectrograph, 1816 low-frequency sampling device, 17 low-frequency sampling device 17
The parameter of frequency spectrograph is set as Span=24MHz, CF=0Hz, RBW=2e3Hz, so as to see on frequency spectrograph
Examine out radar resolution,
It should be understood by those ordinary skilled in the art that: the above is only a specific embodiment of the present invention, and
It is not used in the limitation present invention, all any modification, equivalent substitution, improvement and etc. within purport of the invention, done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of modulation /demodulation verification method of radar signal, which is characterized in that the modulation /demodulation authentication of the radar signal
Method is the following steps are included: step 1: be modulated signal；Step 2: being demodulated to the signal modulated in the first step；Third
Step: the signal that verifying demodulates meets the equivalent signal of THz wave；
Signal is modulated specifically includes the following steps:
S110: linear FM signal is subjected to frequency multiplication；
S120: it carries out the linear FM signal after frequency multiplication to be mixed output CW with frequency modulation with fundamental frequency signal；
S130: output and frequency signal are filtered to the CW with frequency modulation；
S140: frequency multiplication is carried out to described and frequency signal and obtains radar emission signal radar emission signal, the radar emission is believed
Number launch from antenna；
S150: simulation receives the radar emission signal, and the radar emission signal is obtained radar by transmission delay module
Echo-signal；
The signal modulated in the first step is demodulated specifically includes the following steps:
S210: receiver receives radar echo signal, and received radar echo signal is separated to mutually orthogonal two
In a channel；
S220: the receiver includes same phase channel and inverted channel, and in the positive channel of the receiver, the radar is returned
Wave signal is mixed to obtain difference frequency signal with radar emission signal；
S230: difference frequency signal progress low-pass filtering is obtained into intermediate-freuqncy signal；
Verify the signal that demodulates meet THz wave equivalent signal specifically includes the following steps:
S310: the radar emission signal that S140 is obtained pass through respectively first time transmission delay, second of transmission delay and
Third time transmission delay, to respectively obtain the first transmission delay signal, the second transmission delay signal and third transmission delay letter
Number；
S320: the first transmission delay signal is mixed with radar emission signal, then the mixed frequency signal is passed through low pass filtered
Wave obtains the first difference frequency signal；First difference frequency signal is made into low-frequency sampling, observes frequency spectrum；
S330: third transmission delay signal is mixed with radar emission signal, then the mixed frequency signal is passed through low pass filtered
Wave obtains the second difference frequency signal；Second difference frequency signal is made into low-frequency sampling, observes frequency spectrum；
S340: by the first transmission delay signal and the second transmission delay signal phase adduction by the signal of output and radar emission signal
It is mixed, then the signal of mixing is obtained into third difference frequency signal by low-pass filtering；Third difference frequency signal is made into low-frequency sampling,
Observe frequency spectrum.
2. the modulation /demodulation verification method of radar signal as described in claim 1, which is characterized in that described in S110 step
The mathematic(al) representation of linear FM signal are as follows:
In formula: A is amplitude；The rectangular window for being τ for a width；f0For original frequency；K is frequency modulation rate；It is described linear
FM signal is the sine wave that changes linearly over time of frequency, the linear FM signal can within the period of 1ms by
300MHz linear increase is to 550MHz, and the bandwidth of the linear FM signal is 250MHz；The linear FM signal times
After frequency, by 600MHz linear increase to 1100MHz, bandwidth 500MHz within the period of 1ms.
3. the modulation /demodulation verification method of radar signal as described in claim 1, which is characterized in that the frequency of the fundamental frequency signal
Rate is 3.65GHz.
4. the modulation /demodulation verification method of radar signal as described in claim 1, which is characterized in that by 16 ranks, 4GHz is arrived
The bandpass filter (5) of 5GHz is filtered output and frequency signal to CW with frequency modulation described in S130 step.
5. the modulation /demodulation verification method of radar signal as described in claim 1, which is characterized in that described to be with frequency signal
The linear frequency modulation sine wave signal of 4.25GHz-4.75GHz.
6. the modulation /demodulation verification method of radar signal as described in claim 1, which is characterized in that the radar emission signal
For the linear frequency modulation sine wave of 8.5GHz-9.5GHz；The radar echo signal be also the linear frequency modulation of 8.5GHz-9.5GHz just
String wave, and the radar echo signal relative to the radar emission signal, there are time delays.
7. a kind of radar signal modulation /demodulation emulates equivalent model, which is characterized in that the modulating and demodulating signal emulates equivalent mould
Type includes:
Signal source module (1), the signal source module (1) provide linear FM signal；
Fundamental frequency signal module (2), the fundamental frequency signal module (2) is for providing fundamental frequency signal；
First frequency multiplier (3), the output end of the input terminal connection signal source module (1) of first frequency multiplier (3), for letter
The linear FM signal that number source module (1) generates carries out frequency multiplication；
The input terminal of first frequency mixer (4), first frequency mixer (4) is separately connected the output end and base of the first frequency multiplier (3)
The output end of frequency signaling module (2), the input terminal of output end connection bandpass filter (5) of the first frequency mixer (4), the band logical
Filter (5) output and frequency signal；
Second frequency multiplier (6), the output end of input terminal connection bandpass filter (5) of second frequency multiplier (6), for institute
It states and obtains two paths of signals radar emission signal with frequency signal progress frequency multiplication, wherein launching all the way from antenna；In addition it passes through all the way
Transmission delay is crossed as radar return；
The two paths of signals solution is transferred to low-frequency range by demodulation module, the demodulation module.
8. radar signal modulation /demodulation as claimed in claim 7 emulates equivalent model, which is characterized in that first frequency mixer
It (4) include multiplier, the input terminal of the multiplier is the input terminal of first frequency mixer (4), and the output end of multiplier connects
The input terminal of tape splicing bandpass filter (5).
9. modulating and demodulating signal as claimed in claim 7 emulates equivalent model, which is characterized in that the demodulation module is I/Q
It includes first passage and second channel to quadrature demodulation unit, and the first passage and second channel are mutually orthogonal, first passage
In be equipped with the second frequency mixer (7) and first filter (8), the input terminal of second frequency mixer (7) inputs radar emission respectively
Signal and radar echo signal, the input terminal of output end connection first filter (8) of second frequency mixer (7).
10. radar signal modulation /demodulation as claimed in claim 7 emulates equivalent model, which is characterized in that further include with it is described
The radar resolution that modulating and demodulating signal emulates equivalent model connection verifies mould group, which is characterized in that the radar resolution is tested
Demonstrate,proving mould group includes:
Transmission delay module, the transmission delay module include the first transmission delay module (9), the second transmission delay module (10)
With third transmission delay module (11), the input terminal of the first transmission delay module (9), the second transmission delay module (10)
Input terminal and the input terminal of third transmission delay module (11) are all connected with the second frequency multiplier (6) as described in claim 8
Output end, for receiving the radar emission signal of the second frequency multiplier (6) output；
Third frequency mixer (12), the input terminal of the third frequency mixer (12) are separately connected the defeated of the first transmission delay module (9)
The output end of the output end of outlet and the second frequency multiplier (6), the third frequency mixer (12) connects second filter (16)；It is described
The input terminal of output end connection low-frequency sampling device (17) of second filter (16), frequency spectrograph (18) connect the low-frequency sampling device
(17) output end；
The input terminal of 4th frequency mixer (13), the 4th frequency mixer (13) is separately connected the defeated of third transmission delay module (11)
The output end of outlet and the second frequency multiplier (6), the output end connection one second filter (16) of the 4th frequency mixer (13)
Input terminal；The input terminal of output end connection low-frequency sampling device (17) of the second filter (16), frequency spectrograph (18) connect institute
State the output end of low-frequency sampling device (17)；
Adder (14), the input terminal of the adder (14) are separately connected the output end and of the first transmission delay module (9)
The output end of two transmission delay modules (10)；
5th frequency mixer (15), the input terminal of the 5th frequency mixer (15) be separately connected the adder (14) output end and
The output end of second frequency multiplier (6), the input terminal of the output end connection one second filter (16) of the 5th frequency mixer (15)；
The input terminal of output end connection low-frequency sampling device (17) of the second filter (16), frequency spectrograph (18) connect the low frequency and adopt
The output end of sample device (17).
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