CN109459733A - Anticollision Radar target velocity simulator, system and method based on pm mode - Google Patents
Anticollision Radar target velocity simulator, system and method based on pm mode Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
Abstract
Description
Technical field
This disclosure relates to frequency microwave the field of test technology, and in particular to a kind of Anticollision Radar target based on pm mode Speed simulator, system and analogy method.
Background technique
Existing Anticollision Radar target velocity analogy method is the simulation as needed first in the way of Doppler frequency shift Velocity magnitude and direction, generate the controllable orthogonal signalling in two-way direction, which is adjusted with the reflection signal of target System is launched by transmitting antenna again after carrying out single-side belt filtering, after Anticollision Radar receives the signal, is carried out at internal Reason, calculates velocity information.
Above-mentioned analogy method needs positive intermodulation on channel since it is desired that generate two-way high-precision doppler frequency signal System, the local oscillation signal that orthogonal modulation needs is postpones signal of the target simulator after data acquire, and simulated range is to 200 meters When, data delay time reaches 1.33 μ S, due to needing two-way Doppler frequency to generate unit, increases the body of analogue unit Product.Existing simulation test has following shortcoming:
(1) analog rate is slow, testing efficiency is low；
It is existing to Anticollision Radar target velocity analogy method since the signal of radar emission being prolonged by certain time It lags and send to I/Q modulator, analog rate is slower, and testing efficiency is low for the test of radar production line；
(2) channel volume is big, at high cost.
It is existing to Anticollision Radar target velocity simulator due to need two-way DDS chip generate two-way I, Q signal, account for Hardware and software resource is more, and entire simulator volume is big, at high cost, is not suitable for this economy field of radar production line The application of conjunction.
In conclusion needing two-way Doppler's frequency for the existing analogy method to Anticollision Radar target velocity and device Rate generation circuit leads to the generation of false target, and analog rate is slower there are local-oscillator leakage in such a way that IQ is mixed, Eventually lead to that testing efficiency is low, and the problem of the volume that hardware resource occupies is big, higher cost, still shortage effective technology side Case.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the Anticollision Radar target based on pm mode that the present invention provides a kind of Speed simulator, system and method, using phase difference analog rate, using FPGA as phase modulation unit, the hardware of occupancy is provided Source is few, scalability is strong, carries out IQ modulation using zero-lag local oscillation signal, analog rate is fast.
The technical scheme adopted by the invention is that:
A kind of Anticollision Radar target velocity simulator based on pm mode, the device include sequentially connected FPGA tune Phase element, DAC and filter unit and single sideband modulation unit；
The FPGA phase modulation unit is configured as the phase control words of receiving host transmission, in the effect of outer trigger signal The lower sine and cosine two paths of signals for generating out of phase, and sinusoidal and cosine two paths of signals is sent to DAC and filter unit；
Sinusoidal and cosine two ways of digital signals is converted sinusoidal and cosine two-way simulation letter by the DAC and filter unit Number, and two-way analog signal is filtered respectively, by the sine and cosine two-way analog signal after filtering processing It send to single sideband modulation unit；
The single sideband modulation unit, is configured as receiving signal that Anticollision Radar is sent as zero-lag local oscillation signal, After sinusoidal, cosine analog signal is mixed with zero-lag local oscillation signal progress IQ respectively, final output frequency f is obtainedoutSend to The input terminal of the transmission channel of simulator.
A kind of Anticollision Radar target velocity simulation system based on pm mode, which includes such as above-mentioned Anticollision Radar Target velocity simulator and host；
The host is configured as calculating the corresponding phase difference of velocity amplitude to be simulated according to speed and the relationship of phase difference The phase difference value, is converted to the phase control words of binary code form by value, is sent to Anticollision Radar target velocity simulation dress It sets.
A kind of Anticollision Radar target velocity analogy method based on pm mode, method includes the following steps:
Host calculates the corresponding phase of velocity amplitude to be simulated according to the speed established and the relational expression of phase difference The phase difference value is converted to the phase control words of binary code form by difference, is sent to the simulation of Anticollision Radar target velocity Device；
After Anticollision Radar target velocity simulator receives the phase control words of host transmission, in the work of outer trigger signal With lower generation sinusoidal and cosine signal；Sinusoidal and cosine signal is converted into two-way analog signal and is filtered, after filtering processing Two paths of signals carry out obtaining final output frequency f after IQ is mixed respectively with zero-lag local oscillation signaloutIt send to simulator The input terminal of transmission channel.
Further, the relational expression of the speed and phase difference are as follows:
Wherein, TCFor the scan period of Anticollision Radar, v is speed,For phase difference, λ=c/fc, fcFor radar emission Initial frequency, c are the light velocity.
Compared with prior art, the beneficial effects of the present invention are:
(1) disclosure carries out speed simulation as core in the way of phase modulation, makes according to certain control and connection relationship This device automatic work, and by blocking design philosophy, there is very strong versatility and maintainability；
(2) disclosure carries out the simulation of Anticollision Radar target friction speed using phase difference, it is only necessary to is arranged by host computer Different phase control words can be completed；
(3) disclosure utilizes the programmable flexibility of FPGA, more using the additional inside FPGA of the hardware resource of single channel Logic Core can simulate the speed of multiple groups target simultaneously, and the hardware resource of occupancy is few, scalability is strong；Reduce hardware resource, only It needs to utilize a phase modulation unit inside FPGA, so that it may sinusoidal and cosine two paths of signals is generated, and is controlled flexibly, phase modulation essence Degree is high；
(4) disclosure carries out digital-to-analogue conversion by dual channel high speed DAC and direct current biasing is adjusted, and degree of regulation is high；It utilizes Zero-lag local oscillation signal carries out IQ modulation, and analog rate is fast；
(5) disclosure can carry out the simulation of multiple target speed, due to carrying out the design of phase modulation unit using fpga logic core, It only needs to call multiple Logic Cores when simulating multiple target, the output of each logic is then subjected to synthesis and achieves that synchronization is more The speed of echo signal generates, and scalability is strong.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is existing Anticollision Radar target velocity analogy method composition block diagram；
Fig. 2 is the Anticollision Radar target velocity simulator structural block diagram of the disclosure；
Fig. 3 is the single sideband modulation cellular construction block diagram of the disclosure；
Fig. 4 is the Anticollision Radar target velocity simulation system structural block diagram of the disclosure；
Fig. 5 is the Anticollision Radar target velocity analogy method flow chart of the disclosure.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Existing Anticollision Radar target velocity analogy method by DDS1, DDS2 Doppler frequency as shown in Figure 1, mainly generated The units such as unit, filter unit, mixing composition.Existing Anticollision Radar target velocity analogy method is needed firstly the need of generation two Road I/Q orthogonal signalling, then two-way i/q signal is filtered and bias-adjusted, 2 two-way of output 1 and output after adjusting Signal carries out IQ mixing with radar received signal, obtains final output frequency and send to radar receiver, output frequency is fout.This method needs the relative phase relation by changing output 1 and output 2 that Doppler frequency generative circuit generates, can To realize output upper side band or output lower sideband, and achieve the purpose that inhibit another side band and local oscillator but due to needing on hardware Two channels, two paths of signals are difficult to accomplish completely the same, and there are certain deviation, and the local oscillation signal that IQ frequency mixer needs is The signal that the signal of radar emission exports after centainly postponing, when simulated range reaches 200 meters, while system when analog rate Delay reaches 1.33 μ S, and analog rate is slower；Due to needing two-way Doppler frequency generative circuit on hardware, hardware volume is big, It is at high cost.
As it can be seen that existing analogy method and device to Anticollision Radar target velocity needs two-way Doppler frequency to generate electricity Road leads to the generation of false target, and analog rate is slower, eventually leads to there are local-oscillator leakage in such a way that IQ is mixed Testing efficiency is low, and the volume that hardware resource occupies is big, higher cost.In order to solve the shortcomings of the prior art, this public affairs It opens and a kind of Anticollision Radar target velocity simulation system and method based on pm mode is provided, utilize target velocity and multiple groups echo Corresponding relationship between signal phase difference converts final speed simulation to the simulation of the phase difference of multiple groups echo-signal, most Eventually by generating sine wave inside FPGA, change the relative phase of each scan period sine wave of sine wave to realize pair The simulation of target velocity makes full use of the features such as FPGA internal logic resource is abundant, number adjustable accuracy is high, passes through and call inside Phase modulation module realizes that Phase Continuation is adjustable, improves the accuracy of simulation, reduces device space.
The present embodiment provides a kind of Anticollision Radar target velocity simulator based on pm mode, as shown in Fig. 2, the dress Set FPGA phase modulation unit, DAC and filter unit, single sideband modulation unit including setting gradually.
The input terminal of FPGA phase modulation unit, the FPGA phase modulation unit is connect with host, and control terminal and trigger signal occur Device connection, is configured as the phase control words of receiving host transmission, is generating out of phase just under the action of outer trigger signal String Sin and cosine Cos two paths of signals, and sinusoidal Sin and cosine Cos two paths of signals are sent to DAC and filter unit.
In the present embodiment, the FPGA phase modulation unit is using DDS core inside XC7K325, by controlling Logic Core Exportable two-way out of phase just, cosine signal.
The input terminal of DAC and filter unit, the DAC and filter unit is connect with FPGA phase modulation unit, output end and list The connection of sideband modulation unit, be configured as converting the sinusoidal Sin of out of phase and cosine Cos two ways of digital signals to it is sinusoidal and Cosine two-way analog signal, and two-way analog signal is filtered respectively, it will be sinusoidal and remaining after filtering processing String two-way analog signal is sent to single sideband modulation unit.
In the present embodiment, the DAC and filter unit include that twin-channel high-speed DAC converter and two convert with DAC Device output end connection filter, by twin-channel high-speed DAC converter by out of phase just, cosine two ways of digital signals Conversion be positive, cosine two-way analog signal, two-way analog signal respectively by corresponding filter filtering processing after, be sent into it is unilateral Band modulation unit.
Twin-channel high-speed DAC converter uses twin-channel DAC chip AD9779, by corresponding to the chip Register control the direct current biasing of adjustable two-way output.
The zero-lag local oscillation signal input terminal of single sideband modulation unit, the single sideband modulation unit connects Anticollision Radar, Output end is connected to the input terminal of the transmission channel of simulator, is configured as receiving the radar hair for the zero-lag that Anticollision Radar is sent Signal is penetrated as zero-lag local oscillation signal, sinusoidal, cosine two-way analog signal is subjected to IQ with zero-lag local oscillation signal respectively and is mixed After frequency, final output frequency f is obtainedoutIt send to the input terminal of the transmission channel of simulator.
In the present embodiment, the single sideband modulation unit is made of homemade IQ modulation chip, as shown in figure 3, the IQ tune Coremaking piece includes that I and Q two-way modulator, all the way frequency mixer and other amplitude and phase adjust part, mainly will be with frequency In the signal modulation to radio-frequency carrier signal of rate information and phase.
Specifically, it includes amplifier I, power splitter, 90 ° of phase shifters, the road I phase shift micro actuator, the amplification of the road I which, which modulates chip, Device, the road I modulator, the road I amplitude regulator, the road Q phase shift micro actuator, the road Q amplifier, the road Q modulator, the road Q amplitude regulator and Frequency mixer, the input terminal of the amplifier connect Anticollision Radar, and output end connects power splitter, the input termination of the amplifier I The radar emission signal of the zero-lag of Anticollision Radar transmitting is received, and after amplifying processing to it, output to power splitter；Power splitter The radar emission signal of zero-lag is divided into two-way zero-lag local oscillation signal, zero-lag local oscillation signal passes through 90 ° of phase shifters all the way Phase shift, the amplitude modulation of the road I phase shift micro actuator, the road I amplifier are amplified into the road I modulator, and sinusoidal analog signal passes through the road I amplitude tune It saves after device is adjusted and enters the road I modulator, after the road the I modulators modulate, be sent into frequency mixer；Another way zero-lag local oscillation signal After the amplitude modulation of the road Q phase shift micro actuator, the amplification of the road Q amplifier, into the road Q modulator；Cosine analog signal passes through the road Q amplitude tune It saves after device is adjusted and enters the road Q modulator, after the road the Q modulators modulate, be sent into frequency mixer；It is mixed, obtains by frequency mixer Final output frequency fout。
In the present embodiment, it is also connected between the road I amplifier, the road I modulator for adjusting the zero-lag sheet for entering the road I The road the I bias regulator that the signal that shakes biases；It is also connected between the road Q amplifier, the road Q modulator and enters the road Q for adjusting The road the Q bias regulator of zero-lag local oscillation signal biasing.
Anticollision Radar target velocity simulator disclosed in the present embodiment will lead to after the signal Direct-conversion of radar emission I/Q modulator is crossed, the radar emission signal direct conversion of zero-lag is equivalent to, improves analog rate, speed is simulated by frequency modulation Mode be converted into the mode of phase modulation, and phase modulation unit is directly generated using the core of patrolling of FPGA, and the variation of positive-negative velocity is direct It is determined by the positive and negative values of phase difference.
The present embodiment also provides a kind of Anticollision Radar target velocity simulation system based on pm mode, as shown in figure 4, should System includes Anticollision Radar target velocity simulator and host as described above.
The host is configured as the relational expression according to speed and phase difference, and it is corresponding to calculate velocity amplitude to be simulated Phase difference value, which is converted to the phase control words of binary code form, is sent to Anticollision Radar target speed Spend simulator.
The corresponding relationship of speed and phase difference are as follows:
There are certain delays for the signal that the signal of Anticollision Radar transmitting receives after target reflects, by formula (1) Known to:
In formula, d is the distance between radar and barrier；C is the light velocity.
The signal of Anticollision Radar transmitting is mixed to obtain one group of intermediate-freuqncy signal with the signal received after target reflects, should The initial phase of intermediate-freuqncy signal isThe initial phase is that Anticollision Radar emits original signal and the letter after target reflects Number phase difference, from formula (2):
Formula (1) is combined with formula (2), obtains formula (3) are as follows:
For being the object of d at a distance from Anticollision Radar, intermediate frequency (IF) signal will be a sine wave, which can table Up to for formula (4):
For the simulation of the echo signal of Anticollision Radar known to formula (4), most direct method is exactly to simulate f0With Formula (5) can be further converted to for formula (4):
Wherein, TCFor the scan period of Anticollision Radar；
Then speed v and phase differenceRelational expression are as follows:
The Anticollision Radar target velocity simulator, after being configured as the phase control words for receiving host transmission, Two paths of signals is generated under the action of external trigger signal, respectively sine Sin and cosine Cos signal；By sinusoidal and cosine two paths of signals Be converted to two-way analog signal and filter corresponding clutter, the two paths of signals after being filtered respectively with the zero-lag that receives Local oscillation signal carry out IQ mixing after, obtain final output frequency foutIt send to the input terminal of the transmission channel of simulator, realizes Single sideband modulation.
The present embodiment also provides a kind of Anticollision Radar target velocity analogy method based on pm mode, and this method is to be based on What Anticollision Radar target velocity simulation system as described above was realized, as shown in figure 5, method includes the following steps:
The signal that Anticollision Radar is sent is input to the zero-lag sheet of Anticollision Radar target velocity simulator by step S101 Shake signal input part, and the output end that Anticollision Radar target velocity is simulated is connected to the input terminal of the transmission channel of simulator；
Step S102, it is corresponding that host calculates the velocity amplitude needed according to the speed established with the relational expression of phase difference Phase difference value, which is converted to the phase control words of binary code form, is sent to Anticollision Radar target speed Spend the FPGA phase modulation unit of simulator；
The phase control words that step S103, FPGA phase modulation unit receiving host is sent, produce under the action of outer trigger signal The sinusoidal Sin and cosine Cos two paths of signals of raw out of phase, and sinusoidal Sin and cosine Cos two paths of signals are sent to DAC and filter Wave unit；
Step S104, DAC and filter unit convert the sinusoidal Sin of out of phase and cosine Cos two ways of digital signals to Sinusoidal and cosine two-way analog signal, and two-way analog signal being filtered respectively, by after filtering processing just String and cosine two-way analog signal are sent to single sideband modulation unit；
Step S105, single sideband modulation unit receive the local oscillation signal for the zero-lag that Anticollision Radar is sent, by sinusoidal, cosine After two-way analog signal is mixed with zero-lag local oscillation signal progress IQ respectively, final output frequency f is obtainedoutIt send to simulator Transmission channel input terminal.
In the present embodiment, the method for building up of the relational expression of the speed and phase difference are as follows:
There are certain delays for the signal that the signal of Anticollision Radar transmitting receives after target reflects, by formula (1) Known to:
In formula, d is the distance between radar and barrier；C is the light velocity.
The signal of Anticollision Radar transmitting is mixed to obtain one group of intermediate-freuqncy signal with the signal received after target reflects, should The initial phase of intermediate-freuqncy signal isThe initial phase is that Anticollision Radar emits original signal and the signal after target reflects Phase difference, from formula (2):
Formula (2) is combined with formula (3), obtains formula (3) are as follows:
For being the object of d at a distance from Anticollision Radar, intermediate frequency (IF) signal will be a sine wave, which can table Up to for formula (4):
For the simulation of the echo signal of Anticollision Radar known to formula (4), most direct method is exactly to simulate f0With Formula (5) can be further converted to for formula (4):
Wherein, TCFor the scan period of Anticollision Radar；
Then speed v and phase differenceRelational expression are as follows:
Wherein, TCFor the scan period of Anticollision Radar, v is speed,For phase difference, λ=c/fc, fcFor radar emission Initial frequency, c are the light velocity.
It can be seen from the above description that disclosure the above embodiments realize following technical effect:
(1) disclosure is that core carries out speed simulation according to the mode of phase modulation, is made according to certain control and connection relationship This device automatic work, and by blocking design philosophy, there is very strong versatility and maintainability；
(2) disclosure carries out the simulation of Anticollision Radar target friction speed using phase difference, it is only necessary to is arranged by host computer Different phase control words can be completed；
(3) disclosure utilizes the programmable flexibility of FPGA, more using the additional inside FPGA of the hardware resource of single channel Logic Core can simulate the speed of multiple groups target simultaneously, and the hardware resource of occupancy is few, scalability is strong；Reduce hardware resource, only It needs to utilize a phase modulation unit inside FPGA, so that it may sinusoidal and cosine two paths of signals is generated, and is controlled flexibly, phase modulation essence Degree is high；
(4) disclosure carries out digital-to-analogue conversion by dual channel high speed DAC and direct current biasing is adjusted, and degree of regulation is high；It utilizes Zero-lag local oscillation signal carries out IQ modulation, and analog rate is fast；
(5) disclosure can carry out the simulation of multiple target speed, due to carrying out the design of phase modulation unit using fpga logic core, It only needs to call multiple Logic Cores when simulating multiple target, the output of each logic is then subjected to synthesis and achieves that synchronization is more The speed of echo signal generates, and scalability is strong.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
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