CN108445485A - MIMO radar transceiving integrated device based on FMCW signal - Google Patents
MIMO radar transceiving integrated device based on FMCW signal Download PDFInfo
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- CN108445485A CN108445485A CN201810106117.6A CN201810106117A CN108445485A CN 108445485 A CN108445485 A CN 108445485A CN 201810106117 A CN201810106117 A CN 201810106117A CN 108445485 A CN108445485 A CN 108445485A
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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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
- G01S7/35—Details of non-pulse systems
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- Radar, Positioning & Navigation (AREA)
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Abstract
The present invention relates to a kind of MIMO radar transceiving integrated device based on FMCW signal, including FMCW signal generator and IF signal processors, FMCW signal generator includes Direct Digital Frequency Synthesizers and frequency synthesizer of phase locking, IF signal processors include the roads N IF signal conditions and sample circuit, wherein N is the even number no more than 10, and IF signal conditions include high pass low-pass filter circuit, voltage controlled gain amplifying circuit and analog to digital conversion circuit with sample circuit.The function that FMCW signal generator part realizes and reduces signal noise, improves signal accuracy, IF signal processors part solve transmitting antenna and need and change with imaging circumstances to the gain that reception antenna couples the influence to system and controls intermediate-freuqncy signal.The present invention realizes the transceiving integrated of FMCW signal and IF signals, and the synchronous gain controllable amplification for realizing multichannel IF signals, cutoff frequency is adjustable filtering and analog-to-digital conversion, can be applied to radar imagery field.
Description
Technical field
The present invention relates to a kind of MIMO radar transceiving integrated device, especially a kind of MIMO radar based on FMCW signal
Transceiving integrated device belongs to MIMO radar imaging field.
Background technology
Multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) Radar concepts in 2004 for the first time
It proposes, is mainly characterized by possessing transmitting antenna and reception antenna simultaneously, the signal of transmitting is mutually orthogonal, returns and connects after target
Antenna is received, independent receive-transmit system is formed.Since the transmitted waveform of MIMO radar has diversity, so with traditional
Radar is compared to more with advantage.
Since the concept of MIMO radar is suggested, the research interest of numerous scholars is just excited rapidly.MIMO radar technology
It is growing and perfect in terms of imaging, and obtain a lot of achievement in research.Present each mechanism is placed on research emphasis
On imaging approach, and verified by experiment and data acquisition.
With the development of the times with science and technology progress, CW with frequency modulation (frequency modulated continuous
Wave, FMCW) radar of system gradually obtains the attention of domestic and international researcher, and its theoretical level and experimental level has greatly
The raising of amplitude.CW with frequency modulation signal generator have test the speed, range accuracy it is high, the advantages such as compatibility is good, in the military, people
It is widely used with equal fields.In some external developed countries, which is applied to velocity-measuring system, navigation system, spy
The multiple fields such as examining system.In all mechanisms, the Massachusetts Polytechnics in the U.S. has started the research of this respect at first.By document
(MIMO radar theory and experimental results[C].Conference Record of the 38th
Asilomar Conference on Signals,Systems and Computers,2004,(1):300-304P.) know
Under the financial support of United States Air Force department, Massachusetts Polytechnics Lincoln laboratory carried out related work in 2004.In reality
In testing, they verify the performance of MIMO radar using the different radar of two service bands and bandwidth.Wherein one is band
Width is 1MHz, and in the radar of L-band work, another portion is bandwidth 500MHz, in the wideband radar of X-band work.According to experiment
As a result it can be derived that, using MIMO technology compared with application traditional technology, the degree of freedom of self-adaptive processing increases, to target
Resolution ratio also get a promotion.By document (Real-time through-wall imaging using an
ultrawideband multiple-input multiple-output(MIMO)phased array radar system
[C].IEEE International Symposium on Phased Array Systems and Technology
(ARRAY),2010:551-558P.) know from 2010 to 2012 year, under the lasting subsidy of United States Air Force department, Lin Kenshi
It tests room and has invented a kind of ultra wide band near field through-wall imaging MIMO radar.The frequency range of the radar is 2GHz-4GHz, emits signal
Using FMCW, ensure the orthogonality for emitting signal using the mode of time-division.Using ranging offset algorithm and related software to experiment
Data carry out processing and data analysis in real time, and final realize carries out the mobile object after cement wall with the image taking speed of 10.8Hz
Real time imagery.
It is a kind of high-performance, the scheme of low cost, DAC+VCO formulas FMCW letters that FMCW signal, which is applied to MIMO radar imaging,
Number generator is since DAC is influenced by conversion accuracy to lead to quantizing noise, and so that precision is reduced influences signal quality, and the present invention selects
DDS+PLL formula FMCW signal generator phase noise phase errors it is smaller, precision is significantly larger than the former.Intermediate frequency
The distance and bearing information for including target in (intermediate frequency, IF) signal simultaneously, in MIMO radar antenna
In array, antenna is laid out in a concentrated manner, and coupling of the signal from transmitting antenna to reception antenna is that influence system is normal
One main cause of work needs to carry out respective handling.In intermediate-freuqncy signal modulation circuit, to meet wanting for different occasions
It asks, the adjustable circuit of designing gain.To design efficient analog to digital conversion circuit according to sampling needs simultaneously.Therefore it designs
The higher FMCW signal generator of precision and IF signal processors are the key that high quality imagings.
Invention content
For the above-mentioned prior art, the technical problem to be solved in the present invention is to provide one kind capable of solving transmitting antenna to connecing
Receive antenna influence of the coupling to system and control intermediate-freuqncy signal gain needed with imaging circumstances and change based on FMCW signal
MIMO radar transceiving integrated device.
In order to solve the above technical problems, the present invention is based on the MIMO radar transceiving integrated devices of FMCW signal, including
FMCW signal generator and IF signal processors, the FMCW signal generator include Direct Digital Frequency Synthesizers and locking phase frequency
Rate synthesizer, IF signal processors include the roads N IF signal conditions and sample circuit, and wherein N is the even number no more than 10, the IF
Signal condition includes high pass-low-pass filter circuit, voltage controlled gain amplifying circuit and analog to digital conversion circuit with sample circuit.
The present invention is based on the MIMO radar transceiving integrated devices of FMCW signal, may also include：
1. using switch capacitor filter chip in high pass-low-pass filter circuit.
2. voltage controlled gain amplifying circuit uses rotary transformer adjust gain size, it is synchronous realize each road IF signal conditions with
The gain controllable of sample circuit intermediate-freuqncy signal amplifies.
3. analog to digital conversion circuit realizes that each road IF signal conditions are believed with sample circuit intermediate frequency using double channel A/D C circuit synchronizations
Number analog-to-digital conversion.
4.FMCW signal generators are S-band FMCW signal generator and emit the centre frequency 2.5GHz of signal, bandwidth
80MHz, power are more than 0dBm.
Advantageous effect of the present invention：
1, high pass-low-pass filter circuit of the invention solves coupling between antenna and out-of-band noise makes image-forming information
At influence.High-pass filter can inhibit the power of the coupled signal in short range, low-pass filter that can disappear
The signal of target and out-of-band noise is filtered out in addition to positioned at investigative range.Using switch capacitor filter make high-pass filter and
The cutoff frequency of low-pass filter can adjust, and solve analogue filter circuit component parameters once it is determined that rear cutoff frequency just can not
The case where change, is suitable for actual radar system.
2, voltage controlled gain amplifying circuit of the invention uses the chip that voltage controlled gain range is continuously adjusted.Due to needing centering
Frequency signal carries out respective handling, and it is too small such as need to improve the anti-stop signal of gain in more spacious place, need to subtract in the place of comparatively dense
Small gain avoids distorted signals, so single gain amplification cannot be satisfied the imaging requirements in different places.Design voltage controlled gain
The continuously adjustable circuit of range can effectively solve the problems, such as this.
3, double channel A/D C sample circuits of the invention, are advantageously integrated, it is small to occupy space, it can be ensured that multichannel road analog-to-digital conversion
Property while circuit sampling.
Description of the drawings
Fig. 1 is the MIMO radar transceiving integrated device structure chart based on FMCW signal.
Fig. 2 is FMCW signal generator output test chart.
Fig. 3 is IF signals waveform after level-one is amplified.
Fig. 4 is IF signals waveform after high-pass filter again after level-one is amplified.
Fig. 5 is IF signals waveform after AD603 again after high-pass filter.
Fig. 6 is IF signals waveform after two-stage amplifier again after AD603.
Fig. 7 is IF signals waveform after low-pass filtered device again after two-stage amplifier.
Fig. 8 is IF signals waveform (not adjusting rotary transformer) after voltage controlled gain amplifies.
Fig. 9 is that (adjustment rotary transformer amplification factor subtracts waveform IF signals counterclockwise after voltage controlled gain amplifies
It is small).
Figure 10 is that (adjustment rotary transformer amplification factor increases waveform IF signals clockwise after voltage controlled gain amplifies
Greatly).
Figure 11 is the waveform (not adjusting rotary transformer) that the low-pass filtered device of IF signals is acquired through analog-to-digital conversion again.
Figure 12 is that the waveform that the low-pass filtered device of IF signals is acquired through analog-to-digital conversion again (adjusts rotary transformer to put counterclockwise
Big multiple reduces).
Figure 13 is that the waveform that the low-pass filtered device of IF signals is acquired through analog-to-digital conversion again (adjusts rotary transformer to put clockwise
Big multiple increases).
Specific implementation mode
The specific embodiment of the invention is illustrated below in conjunction with the accompanying drawings.
It is 4 tunnel high passes-low-pass filtering that apparatus of the present invention transmitting terminal, which selects DDS+PLL formula FMCW signal generators, receiving terminal,
The IF signal processors that circuit, voltage controlled gain amplifying circuit and analog to digital conversion circuit are constituted.In this way, center can be obtained
The FMCW transmitting signals of frequency 2.5GHz, bandwidth 80MHz, power more than 0dBm and the synchronous gain controllable for realizing 4 road IF signals
Amplification, cutoff frequency is adjustable filtering and analog-to-digital conversion.
As shown in Figure 1, a kind of MIMO radar transceiving integrated device based on FMCW signal, including S-band FMCW signal
Generator and IF signal processors.Being first depending on DDS (Direct Digital Frequency Synthesizers) and PLL, (indirect frequency synthesizer is also known as
For frequency synthesizer of phase locking) principle and feature design center frequency 2.5GHz, bandwidth 80MHz, power be more than 0dBm FMCW
Signal generator；Then design IF signal processors, including the bandwidth-limited circuit of high-pass filter and low-pass filter composition,
The analog to digital conversion circuit of gain size adjustable voltage controlled gain amplifying circuit and double channel A/D C；It is final realize FMCW signal and
IF signal transmitting and receiving integrations.Detailed process is as follows：
S-band FMCW signal generator part：DDS have frequency range is wide, the frequency agility time is short, frequency resolution is high and
The excellent characteristic of phase noise, and various modulation can be conveniently realized.But working frequency current DDS is relatively low, it is spuious
It is more complicated, it needs to be synthesized with PLL.Which not only solves the not high problem of frequency synthesizer of phase locking resolution ratio, and
And mostly low problem is overcome DDS clutters also by the narrow bandwidth tracking characteristics of PLL with output frequency.
DDS+PLL frequency synthesizer output frequencies are expressed as：
fo=MF=MKfc/2N (1)
In formula, fcFor crystal reference source output frequency；F=fc/2NFor DDS output frequencies；M is the frequency dividing of frequency divider in PLL
Than K is frequency control word, and N is the phase accumulator word length of DDS.It is found that the resolution ratio of synthesizer depends on DDS from formula (1)
Resolution ratio, output bandwidth is M times of DDS output bandwidths.This converter can make frequency transformation period elongated, while can also lead
The frequency and resolution ratio for causing work are got higher.
At work, DDS first generates simple signal, the input signal as PLL.After phaselocked loop, input voltage
Difference with both output voltages is zero, reaches PGC demodulation at this time.Swept frequency range is arranged using DDS control words, according to requiring
Upper limiting frequency and lower frequency limit are set.DDS of the present invention selects AD9910 chips, PLL that HMC820 chips, setting DDS is selected to control
Word upper limiting frequency is 50.8MHz, and lower frequency limit 49.2MHz, the frequency multiplication multiple that PLL is arranged in control word is 50 times, i.e. PLL's is defeated
It is 2.46GHz-2.54GHz to go out frequency range, to ensure that centre frequency is 2.5GHz.
IF signal processors part：After intermediate-freuqncy signal input, first stage amplifier is first passed through；Using high-pass filter, this
When there are impedance problems, and filter can play attenuation to signal, be embodied on voltage；Later using voltage controlled gain
Amplifier AD603, amplification factor can be controlled by rotary transformer, rotated amplification factor counterclockwise and reduced, instantaneous time rotation amplification
Multiple increases；Then pass through two-stage amplifier；Using low-pass filter, voltage has certain decaying；Modulus is finally carried out to turn
It changes.
High-pass filter is used for inhibiting the power of the coupled signal in short range, low-pass filter to be used for eliminating
The signal of target and out-of-band noise is filtered out except investigative range.In actual radar system, measuring distance range is
It is changed according to the different requirements of different user, so to ensure that the frequency range of bandwidth-limited circuit is adjustable.According to
Analogue filter circuit, the parameter of element are unsatisfactory for requiring, so the present invention selects once it is determined that rear cutoff frequency just can not adjust
2 switch capacitor filter chip LTC1068 produced by Linear Techn Inc. make high-pass filter and low-pass filter
Cutoff frequency can adjust, and LTC1068 can be realized as high low-pass filtering by the way that peripheral circuit is arranged, and conveniently build electricity
Road.
In IF signal processors, needs to carry out respective handling to intermediate-freuqncy signal, such as amplify.It needs to improve in more spacious place
The anti-stop signal of gain amplifier is too small, and need to reduce gain amplifier in the place of comparatively dense avoids distorted signals.Single gain amplification
The amplifying device that cannot be satisfied the imaging requirements in different places, therefore voltage controlled gain range should be used to be continuously adjusted.The present invention selects
It is controlled with linear in dB gain, the chip AD603 that gain ranging is adjustable, bandwidth is unrelated with variable gain, not only encapsulates smaller, be conducive to
It is integrated, and noise is smaller.
The analog signal of IF signal processors output is input to after A/D is converted into digital signal in FPGA, therefore is wanted
Design 4 road IF signal processings and sample circuit, and the synchronous analog-to-digital conversion for realizing 4 tunnel intermediate-freuqncy signals.According to requiring, select
Double channel A/D C be Differential Input, differential transfer mode has following three prominent characteristics：First strong antijamming capability.Interference is made an uproar
Size and Orientation of the sound in two signal lines is consistent, is filtered out by common mode inhibition.Second can effectively inhibit electromagnetic interference.
Two signal wire distances are very short, and signal amplitude size is identical.There is electricity between the two root signal wires and ground wire simultaneously
Magnetic field, amplitude is identical, and polarity is on the contrary, can cancel out each other.Third sequential positioning stablity.Common single-ended signal, the change of sequential
Change point and depend on threshold voltage, is easier to change, it is relatively unstable.And the timing variations point of differential signal and two signal lines
On amplitude difference it is related, i.e. sequential also changes when difference changes, and will not be interfered by signal voltage.Compared to it
Under, the sequential of differential signal is more stablized.So the present invention selects LTC2286 chips to build analog to digital conversion circuit, collection is both facilitated
At it is small to occupy space, in turn, ensures that 4 road analog to digital conversion circuits sampling while property and stability.
It is final to realize FMCW signal and IF signal transmitting and receiving integrations, meet transmitting four road of FMCW signal all the way and receives simultaneously simultaneously
Handle the function of IF signals；
The effect of the present invention can pass through following description of test：
(1) experiment condition and content：
1, the MIMO radar transceiving integrated device design drawing based on FMCW signal
Fig. 1 is the MIMO radar transceiving integrated device design drawing based on FMCW signal, and left side is FMCW signal generator
Partial circuit, right side are IF signal processor partial circuits.
2, FMCW signal generator measure of merit
Fig. 2 is FMCW signal generator output test chart, i.e., the waveform after acquiring all swept-frequency signals.Abscissa represents
Frequency, unit MHz；Ordinate represents amplitude, unit dBm.It can directly find out that centre frequency is 2.5GHz, work(from figure
Rate is more than 0dBm.Lateral totally ten small lattice in grid shown by frequency spectrograph, frequency range 100MHz, a small lattice are ranging from
10MHz, the waveform after acquisition account for 8 small lattice altogether, it is known that bandwidth 80MHz.It can be seen that FMCW signal generator test result is equal
Meet design requirement.
3, IF signal processors measure of merit
Input the frequency f of intermediate-freuqncy signalo=1KHz, voltage peak-to-peak value Vpp=2mV.
Fig. 3 is IF signals waveform after level-one is amplified.Abscissa represents the time, and unit is μ s；Ordinate represents
Amplitude, unit mV.After intermediate-freuqncy signal input, first pass through after level-one amplifier amplifies 21 times, obtained voltage V1st=47.6mV.
Fig. 4 is IF signals waveform after high-pass filter again after level-one is amplified.Abscissa represents the time, single
Position is μ s；Ordinate represents amplitude, unit mV.There are impedance problems when signal passes through high-pass filter, and filter meeting
Attenuation is risen to signal, and is embodied on voltage, voltage V is measuredhp=24mV.
Fig. 5 is IF signals waveform after AD603 again after high-pass filter.Abscissa represents time, unit
For μ s；Ordinate represents amplitude, unit mV.Signal passes through AD603, and amplification factor can be controlled by rotary transformer, output electricity
Press Vout=928mV.
Fig. 6 is IF signals waveform after two-stage amplifier again after AD603.Abscissa represents time, unit μ
s；Ordinate represents amplitude, unit mV.Signal amplifies 2 times by two level amplifier, obtained voltage V2st=1.83V.
Fig. 7 is IF signals waveform after low-pass filtered device again after two-stage amplifier.Abscissa represents the time, single
Position is μ s；Ordinate represents amplitude, unit mV.Signal finally passes through low-pass filter, voltage attenuation VLP=1.81V.
By Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, it can be seen that the noise of signal output waveform obviously becomes smaller, illustrate filter circuit
The function of finally realizing meets design requirement.
Fig. 8 is IF signals waveform (not adjusting rotary transformer) after voltage controlled gain amplifies.When abscissa represents
Between, unit is μ s；Ordinate represents amplitude, unit mV.VGA=290mV at this time, Vout=1.85V.
Fig. 9 is IF signals waveform (adjusting rotary transformer counterclockwise) after voltage controlled gain amplifies.Abscissa generation
Table time, unit are μ s；Ordinate represents amplitude, unit mV.After rotary transformer is adjusted counterclockwise, by figure it can be seen that
Amplification factor reduces, and amplitude reduces.VGA=155mV at this time, Vout=980mV.
Figure 10 is IF signals waveform (adjusting rotary transformer clockwise) after voltage controlled gain amplifies.Abscissa generation
Table time, unit are μ s；Ordinate represents amplitude, unit mV.After rotary transformer is adjusted clockwise, by figure it can be seen that
Amplification factor increases, and amplitude increases.VGA=350mV at this time, Vout=2.49V.
By Fig. 8, Fig. 9, Figure 10, it can be seen that rotary transformer can change the size of gain, which meets design and wants
It asks.
The output of modulus conversion chip is collected in computer, using Quartus softwares, obtains following waveform.
Figure 11 is the waveform (not adjusting rotary transformer) that IF signals are acquired through analog-to-digital conversion.Abscissa is the time, indulges and sits
It is designated as amplitude, VGA=188mV when not adjusting rotary transformer.
Figure 12 is the waveform (adjusting rotary transformer counterclockwise) acquired through analog-to-digital conversion.Abscissa is time, ordinate
For amplitude, VGA=95mV after rotary transformer is adjusted counterclockwise.By scheming it can be seen that the amplitude of waveform is subtracted compared with Figure 11
It is small.
Figure 13 is the waveform (adjusting rotary transformer clockwise) acquired through analog-to-digital conversion.Abscissa is time, ordinate
For amplitude, VGA=268mV after rotary transformer is adjusted clockwise.By figure it can be seen that waveform amplitude compared with Figure 11
Increase.
By Figure 11, Figure 12, Figure 13, it can be seen that the output-consistence of 4 tunnel intermediate-freuqncy signals is very high, 4 electricity can be changed simultaneously
The gain size on road, the function meet design requirement.
It is proved by testing, part design meets the synchronous gain controllable amplification for realizing 4 tunnel intermediate-freuqncy signals, cutoff frequency
The requirement of adjustable filtering and analog-to-digital conversion.
The specific embodiment of the invention further includes：
One kind being based on the MIMO radar transceiving integrated device of CW with frequency modulation (FMCW) signal, including S-band FMCW letters
Number generator and IF signal processors.S-band FMCW signal generator is by Direct Digital Frequency Synthesizers and Phase locking frequency synthesis
Device is constituted.The IF signal processors are made of the identical IF signal conditions of 4 tunnel functions with sample circuit, every to include all the way
High pass-low-pass filter circuit, voltage controlled gain amplifying circuit and analog to digital conversion circuit.
The centre frequency 2.5GHz, bandwidth 80MHz, power that S-band FMCW signal generator emits signal are more than 0dBm.
In high pass-low-pass filter circuit of IF signal processors, high-pass filter can inhibit in short range
Coupled signal power, low-pass filter can eliminate except investigative range the signal of target and filter out band and make an uproar outside
Sound.
In high pass-low-pass filter circuit of IF signal processors, using switch capacitor filter chip, ensure high-pass filtering
The cutoff frequency of device and low-pass filter can adjust.
In the voltage controlled gain amplifying circuit of IF signal processors, using controllable gain amplifier chip adjust gain size with
Meet the imaging requirements in different places, the synchronous gain controllable amplification for realizing 4 tunnel intermediate-freuqncy signals.
In the analog to digital conversion circuit of IF signal processors, the mould of 4 tunnel intermediate-freuqncy signals is realized using double channel A/D C circuit synchronizations
Number conversion.
The invention discloses a kind of multiple-input and multiple-output (MIMO) radar transmit-receives being based on CW with frequency modulation (FMCW) signal
Integrated apparatus, the device utilize Direct Digital Frequency Synthesizers, frequency synthesizer of phase locking, high pass-low-pass filter, voltage-controlled increasing
Beneficial amplifier and analog-digital converter complete the design to S-band FMCW signal generator and intermediate frequency (IF) signal processor.FMCW
The function that signal generator part realizes and reduces signal noise, improves signal accuracy, IF signal processors part includes to IF
The conditioning and sampling of signal solve transmitting antenna and couple the influence to system to reception antenna and control the gain of intermediate-freuqncy signal
It needs and changes with imaging circumstances.The present invention realizes the transceiving integrated of FMCW signal and IF signals, and synchronous realizes multichannel
The gain controllable of IF signals amplifies, cutoff frequency is adjustable filtering and analog-to-digital conversion, can be applied to radar imagery field.
Claims (6)
1. a kind of MIMO radar transceiving integrated device based on FMCW signal, it is characterised in that：Including FMCW signal generator
With IF signal processors, the FMCW signal generator includes Direct Digital Frequency Synthesizers and frequency synthesizer of phase locking, IF letters
Number processor includes the roads N IF signal conditions and sample circuit, and wherein N is the even number no more than 10, the IF signal conditions with adopt
Sample circuit includes high pass-low-pass filter circuit, voltage controlled gain amplifying circuit and analog to digital conversion circuit.
2. a kind of MIMO radar transceiving integrated device based on FMCW signal according to claim 1, it is characterised in that：
Switch capacitor filter chip is used in the high pass-low-pass filter circuit.
3. a kind of MIMO radar transceiving integrated device based on FMCW signal according to claim 1 or 2, feature exist
In：The voltage controlled gain amplifying circuit uses rotary transformer adjust gain size, synchronous to realize each road IF signal conditions and adopt
The gain controllable of sample circuit intermediate-freuqncy signal amplifies.
4. a kind of MIMO radar transceiving integrated device based on FMCW signal according to claim 1 or 2, feature exist
In：Analog-digital conversion circuit as described realizes each road IF signal conditions and sample circuit intermediate-freuqncy signal using double channel A/D C circuit synchronizations
Analog-to-digital conversion.
5. a kind of MIMO radar transceiving integrated device based on FMCW signal according to claim 3, it is characterised in that：
Analog-digital conversion circuit as described realizes the mould of each road IF signal conditions and sample circuit intermediate-freuqncy signal using double channel A/D C circuit synchronizations
Number conversion.
6. a kind of MIMO radar transceiving integrated device based on FMCW signal according to claim 1 or 2, feature exist
In：The FMCW signal generator is S-band FMCW signal generator and emits the centre frequency 2.5GHz of signal, bandwidth
80MHz, power are more than 0dBm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109521417A (en) * | 2018-12-07 | 2019-03-26 | 哈尔滨工程大学 | Multi-target detection calculation method and a kind of fmcw radar waveform based on fmcw radar waveform |
| CN111007463A (en) * | 2019-12-25 | 2020-04-14 | 湖南纳雷科技有限公司 | Verification and simulation integrated system for radar intermediate frequency signal simulation processing |
| WO2021102693A1 (en) * | 2019-11-26 | 2021-06-03 | 珠海微度芯创科技有限责任公司 | Multi-input multi-output radar and mobile tool |
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