CN106226761B - A kind of relevant higher-frequency radar multifrequency detection method of high-performance - Google Patents

A kind of relevant higher-frequency radar multifrequency detection method of high-performance Download PDF

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CN106226761B
CN106226761B CN201610533543.9A CN201610533543A CN106226761B CN 106226761 B CN106226761 B CN 106226761B CN 201610533543 A CN201610533543 A CN 201610533543A CN 106226761 B CN106226761 B CN 106226761B
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frequency
radar
signal
phase
error
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CN106226761A (en
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蓝爱兰
阎敬业
蒋松
李广明
王赤
吴季
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National Space Science Center of CAS
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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
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems

Abstract

The present invention provides a kind of relevant higher-frequency radar multifrequency detection methods of high-performance, the described method includes: step 1) specifies the frequency values of several frequencies and the observation beam of each frequency, it is directed toward the phase shift increments for determining each frequency according to observation beam, thus designs the transmitting signal in each channel of radar transmitter；Rate-aided signal is designed, inconsistency error between inconsistency error and receiving channel between transmission channel: range error and phase error is obtained on the basis of first passage；Amplitude Compensation and phase compensation are carried out to transmitting signal using inconsistency error between transmission channel, realize nonuniformity correction between transmission channel；Step 2) will be launched after the compensated emitted machine filter and amplification of transmitting signal by antenna；Then its echo is received by antenna and radar receiver again；Step 3) carries out frequency separation to echo digital signal, and carries out Amplitude Compensation and phase compensation using inconsistency error between the receiving channel obtained in step 1), obtains radar return data.

Description

A kind of relevant higher-frequency radar multifrequency detection method of high-performance
Technical field
The present invention relates to Radar Technology field, in particular to a kind of high-performance is concerned with higher-frequency radar multifrequency detection method.
Background technique
International SuperDARN (SuperDARN) is formed for high latitude area anomalous of the ionosphere in studying Be concerned with the radar netting that forms of higher-frequency radar battle array by tens of grounds.Ground is concerned with higher-frequency radar battle array according to received electricity Absciss layer echo obtains the speed and spectrum width of ionospheric drift, is further used for establishing the convection model in ionosphere.
Ionospheric plasma convection current is a kind of form of expression of solar wind-Magnetospheric coupling, with magnetosphere-ionization layer system electricity Dynamic process has close connection.The direction of interplanetary magnetic field (IMF) and size are to influence the determinant of ionospheric convection, IMF north-south component determines the basic structure of convection current and the intensity and space scale of convection current, and IMF thing component mainly influences pair The morning and evening asymmetry of stream.Under the conditions of quasi-static iMF, people have had relatively deeply the statistical nature of ionospheric convection Understanding and understanding.However, ionospheric convection to some critical issues for the transient response process that solar wind changes need into One step research.The temporal resolution that SuperDARN observes ionospheric convection at present is 1-2min, if improving temporal resolution, It will be helpful to the more accurate transient response process that we study ionospheric convection to sun wind disturbance, if ionospheric convection is to too The response of the pneumatic pressure enhancing of sun, ionosphere is drilled travelling Convection cell (Traveling convection vortex's, TCV) Change process.Therefore, the temporal resolution for improving radar is also significant to research ionospheric convection model.
In order to improve detection time resolution ratio, SuperDARN radar generallys use special scanning mode, realizes to a certain A wave position/direction carries out high time resolution detection, and there will be reduced for other wave position/direction temporal resolutions.It utilizes Two frequencies are simultaneously observed different wave position/directions, are increasing substantially the same of the temporal resolution in certain important orientation When, it does not reduce other wave position/direction temporal resolutions not only, also slightly improves.It detects, then can significantly mention according to multifrequency High time resolution.
Currently, generalling use the effect for increasing receiver channel, reaching " hair (transmitter) is double to receive (receiver) " in the world Fruit is achieved in dual frequency sounder.The characteristics of this method be on signal processing it is simple directly, but will increase system complexity and at Therefore this, also limits the realization of multifrequency detection method；In addition, due to the imperfection of hardware, using the system of " hair is double to be received " Measurement accuracy can be reduced with the inconsistency introduced between receiving channel.
Summary of the invention
It is an object of the invention to overcome the low performance of existing dual frequency sounder method, high cost, high complexity issue.This hair The bright means using Digital Signal Processing pass through the conjunction to transmitting signal, transmitter and receiver bandwidth in conjunction with internal calibration method The detection of high-performance multifrequency is realized in reason design.Compared with the method for increasing receiver channel, the invention avoids increase analog circuit band The various imperfection errors come improve system performance, while reducing system complexity and cost；The present invention also passes through internal calibration Realization is corrected the amplitude phase error of transmitter, receiver, reduces the influence of interchannel inconsistency, further increases system Performance realizes the detection of high-performance multifrequency to obtain the measurement data of higher precision.Method of the invention have high flexibility, The feature of high-performance, low cost.
To achieve the goals above, the present invention provides a kind of high-performance high-frequency radar multifrequency detection methods, comprising:
Step 1) specifies the frequency values of several frequencies and the observation beam of each frequency, is directed toward and is determined according to observation beam Thus the phase shift increments of each frequency design the transmitting signal in each channel of radar transmitter；Rate-aided signal is designed, with first passage On the basis of obtain inconsistency error between inconsistency error and receiving channel between transmission channel: range error and phase error； Amplitude Compensation and phase compensation are carried out to transmitting signal using inconsistency error between transmission channel, realized different between transmission channel The correction of cause property；
Step 2) will be launched after the compensated emitted machine filter and amplification of transmitting signal by antenna；Then again by antenna Its echo is received with radar receiver；
Step 3) carries out frequency separation to echo digital signal, and utilizes inconsistency between the receiving channel of step 1) acquisition Error carries out Amplitude Compensation and phase compensation to the signal after separation, to realize nonuniformity correction between receiving channel, obtains Radar return data.
In above-mentioned technical proposal, also include before the step 1): the parameter of setting radar transmitter and radar receiver； The parameter of the radar transmitter and radar receiver includes: radar transmitter and radar receiver bandwidth B, single-frequency detection radar Transmission power and multifrequency detection radar transmission power.
In above-mentioned technical proposal, the radar transmitter and radar receiver bandwidth B meet:
B≥N*Bsub+(N-1)*ΔB
Wherein, look-in frequency quantity is N, respective bandwidth Bsub, Δ B is the frequency interval of two subbands of filter.
In above-mentioned technical proposal, the single-frequency detection radar transmission power PtMeet:
Wherein, G is antenna gain；λ is radar operation wavelength；σ is the radar reflection section of target；R is target and radar Distance；F is propagation coefficient；kBFor Boltzmann constant；TrFor receiver temperature；
When realizing that N frequency detects, N frequency detection radar transmission power Pt (N)Are as follows:
Pt (N)=NPt。
In above-mentioned technical proposal, the step 1) is specifically included:
Step 101) specifies the frequency values of several frequencies and the observation beam of each frequency, is directed toward according to observation beam true The phase shift increments of fixed each frequency, thus design the transmitting signal of each frequency in each channel of radar transmitter, by all differences Frequency emissioning signal is overlapped to obtain the transmitting signal in each channel；
Step 102) designs rate-aided signal, on the basis of first passage, by making comparisons with first passage calibration output, obtains The deviation that output and first passage are calibrated to other channels, to obtain interchannel inconsistency error: range error and phase Error；
Step 103) carries out Amplitude Compensation and phase compensation to transmitting signal using inconsistency error between transmission channel, real Nonuniformity correction between existing transmission channel.
In above-mentioned technical proposal, specifically included when in the step 101):
Step 101-1) specify the frequency values f of N number of frequency1,f2,…fNAnd the observation beam of each frequency is directed toward: θB,1、 θB,2、…、θB,N；
Step 101-2) phase shift increments of each frequency are determined according to observation beam
Wherein, λiFor i-th of look-in frequency fiCorresponding wavelength,C is the light velocity；
Step 101-3) according to observing frequency and corresponding phase shift increments, design the transmitting of each frequency of each transmission channel Signal:
Wherein: sk,i(t) emit the signal of i-th of frequency in signal for transmission channel k；Ak,iEmit for transmission channel k and believes The amplitude of i-th of frequency component in number, k=1 ... M, M are total number of channels；I=1 ... N；And require | Ak,i|2≤Pt；
Step 101-4) transmitter channels k transmitting signal sk(t) are as follows:
In above-mentioned technical proposal, the step 102) is specifically included:
Step 102-1) design rate-aided signal；Rate-aided signal scal(t) include all frequency signals:
Wherein, A is the amplitude of rate-aided signal,For the start-phase of signal；
Step 102-2) working frequency be fiWhen read first channel calibration data, obtain its amplitude A1,iAnd phase PositionEnable k=1；
Step 102-3) k=k+1 is enabled, read work frequency is fiWhen k-th of channel calibration data, obtain its amplitude Ak,iAnd phase
Step 102-4) calculate range error Δ ak,iAnd phase error
Δak,i=A1,i/Ak,i
Step 102-5) judge whether k is equal to M, if a determination be made that certainly, it is transferred to step 103)；Otherwise, it is transferred to Step 102-3).
In above-mentioned technical proposal, the nonuniformity correction of the interchannel of the step 103) is by carrying out width to transmitting signal Degree compensation is realized with phase compensation:
Working frequency is fi, transmission channel k, k=1,2 ..., the range error and phase error of M is Δ ak,iWith Step 101-4) transmitting signal become after Amplitude Compensation and phase compensation:
s′K, iIt (t) is compensated transmitting signal；
It is described with plural form, above formula indicates are as follows:
In above-mentioned technical proposal, the step 3) is specifically included:
Step 3-1) using digital band-pass filter to echo-signal carry out frequency separation；
Step 3-2) pass through Digital Down Convert to the single-frequency segment signal progress orthogonal detection after frequency separation；
Step 3-3) low-pass filtering is carried out to the baseband signal after detection；
Step 3-4) using each inter-channel level error and phase error obtained in step 102), to number after low-pass filtering According to progress amplitude and phase correction；
Working frequency is fi, receiving channel k, k=1,2 ..., the range error and phase error of M is respectively Δ ak,iWithI, Q of respective channel export Ik,iAnd Qk,iIt is respectively as follows:
I, the Q signal of receiving channel k becomes after received machine amplitude-phase consistency correction:
Step 3-5) digital bea mforming is carried out to result after the amplitude and phase correction of the same frequency range in all channels, it obtains radar and returns Wave number evidence.
The present invention has the advantages that
1, method of the invention realizes that multifrequency detects using digital signal processing method, does not need multi-receiver, improves system System performance, while reducing system cost and system complexity；
2, method of the invention is substituted multi-receiver in the way of digital processing and realizes multifrequency detection, can be better ensured that The consistency of each interchannel of radar battle array, improves radar system performance；
3, method of the invention is corrected inter-channel level error and phase error by internal calibration, reduces system and misses Difference influences, and improves radar system performance.
Detailed description of the invention
Fig. 1 is high-performance coherent radar multifrequency detection method flow chart of the invention；
Fig. 2 is wave bit scan schematic diagram when single-frequency detects；
Fig. 3 is wave bit scan schematic diagram when improving temporal resolution using three frequency detections；
Fig. 4 is phase compensation schematic diagram in the battle array of linear array antenna battle array；
Fig. 5 is transmitting Design of Signal flow chart of the invention；
Fig. 6 is pulse time diagram；
Fig. 7 is that multichannel of the invention calibrates for error process flow diagram；
Fig. 8 is multifrequency echo signal processing flow chart of the invention.
Specific embodiment
The present invention will be further described in detail in the following with reference to the drawings and specific embodiments.
A kind of relevant higher-frequency radar multifrequency detection method of high-performance, as shown in Figure 1, which comprises
Step 1) determines look-in frequency range according to target property, and according to detection demand determine look-in frequency quantity N and Bandwidth Bsub；
Step 2) is designed transmitter bandwidth and receiver bandwidth according to determining look-in frequency quantity and bandwidth；
Determine that look-in frequency quantity is N, respective bandwidth Bsub, consider that the practical cutoff frequency of filter is greater than bandwidth, be The interference between different frequency range is avoided as far as possible, it is desirable that the bandwidth B of transmitter and receiver meets the following conditions:
B≥N*Bsub+(N-1)*ΔB (1)
In above formula, Δ B is the frequency interval of two subbands of filter.
Step 3), according to factors such as detection range, receiver performance and look-in frequency quantity, radar transmission power is carried out Design；It specifically includes:
Step 3-1), determine the detection range and receiver sensitivity of radar；
Step 3-2), estimation radar working frequency range Background Noise Power；
Step 3-3), according to factors such as detection range, target property, receiver performances, determine and sent out when single-frequency detection Penetrate power demand；
It is related that the echo power that radar receives depends not only on transmission power, also with antenna gain, detection range, mesh It is related to mark the factors such as characteristic.Relationship between the echo power and transmission power of radar is usually described with radar equation:
Wherein, PrAnd PtRespectively radar return power and transmission power；G is antenna gain；λ is radar operation wavelength；σ For the radar reflection section of target；R is target at a distance from radar；F is propagation coefficient caused by path attenuation and other factors.
Radar can not directly measure target echo power, the total reception being made of target echo and system noise measured Power；Total received power PsAre as follows:
Ps=Pr+Pn (3)
Wherein: PnFor receiver noise power.And receiver noise intensity and its bandwidth B and receiver temperature TrBetween close System is shown below:
Pn=kBTrB (4)
In above formula: kBFor Boltzmann constant.In order to extract effective echo information from the signal that radar receives, send out Penetrate power PtDesign when need to guarantee the reception power P of radarrGreater than receiver noise Pn, i.e.,
Pr> Pn (5)
(2) formula and (4) formula are substituted into (5) formula, obtained
That is transmission power PtFollowing formula need to be met:
Step 3-4), according to look-in frequency quantity, transmission power when determining multifrequency detection；
Determine that the transmission power needed when single-frequency detection is P by step 3-3)t, to realize that N then needs to send out when frequency detects Penetrate machine power Pt (N)Are as follows:
Pt (N)=NPt
Step 4) is designed transmitting signal according to the observed pattern of multifrequency detection；
In order to improve temporal resolution, it is desirable that transmitting signal is made of multi-frequency signal, and each frequency signal is through wave beam Detection direction after synthesis is different, i.e., is observed simultaneously to multiple and different directions (wave position), so as to shorten observation cycle, improves Temporal resolution；
By taking three frequencies are observed as an example, radar observation region is divided into 24 wave positions, (see Fig. 2) when being detected using single-frequency, The observation cycle for completing the observation of 24 wave positions is 24Td(TdFor the residence time of a wave position)；It is detected according to 3 frequencies (see Fig. 3), observation cycle can be reduced to 8Td, i.e. 2 times of temporal resolution raising.Specifically it is shown in Table 1:
Table 1
As shown in figure 4, being the phased-array radar of linear array at equal intervals for antenna array, if beam position is θB, then phase is required Phase shift increments between the transmitting signal of adjacent unitAre as follows:
Wherein, λ is radar operation wavelength, and d is adjacent antenna spacing.
When detecting raising temporal resolution using multifrequency, each pulse carries the signal of multiple frequencies, and each frequency simultaneously The beam position of rate is different, that is, realizes more wave positions while detecting.
As shown in figure 5, the step 4) specifically includes:
Step 4-1) specify the frequency values f1, f of N number of frequency2,…fNAnd the observation beam of each frequency is directed toward: θB,1、 θB,2、…、θB,N；
Step 4-2) phase shift increments of each frequency are determined according to observation beam
Wherein, λiFor i-th of look-in frequency fiCorresponding wavelength,C is the light velocity.
In addition, since its detection range scale is big, and target speed is high simultaneously for SuperDARN radar, in order to The contradiction that solution range ambiguity and doppler velocity obscure generallys use the multipulse sequence of unequal interval distribution to transmitting signal Carry out amplitude modulation (see Fig. 6).
Step 4-3) according to observing frequency and corresponding phase shift increments, design the transmitting signal of each frequency in each channel:
Wherein: sk,i(t) emit the signal of i-th of frequency in signal for channel k；Ak,iEmit in signal i-th for channel k The amplitude of frequency component, k=1 ... M, M are total number of channels；I=1 ... N；And require | Ak,i|2≤Pt。
Step 4-4) in order to realize the more wave positions of multifrequency while detect, it is desirable that the signal that each pulse carries is multiple-frequency signal, The then transmitting signal s of channel kk(t) are as follows:
Step 5), the range error and phase error for obtaining transmitter and receiver interchannel, i.e. width between Acquisition channel Spend inconsistency error and Sensor gain and phase perturbations error；
As shown in fig. 7, the step 5) specifically includes:
Step 5-1) design rate-aided signal；
From transmitting signal it is different, rate-aided signal be for transmitter and receiver range error and phase error progress Correction does not have specific requirement to synthesis beam position.In order to simplify the treatment process of calibration data, each channel is all made of identical Rate-aided signal.
In addition, due to the frequency characteristic in channel, for same channel, the change in gain and phase delay of different frequency signals It is different.Therefore, when carrying out multifrequency detection, the amplitude phase error to all frequencies is needed to be corrected.In order to realize multifrequency point Amplitude phase error be corrected simultaneously, rate-aided signal include all frequency signals, are as follows:
Wherein, A is the amplitude of rate-aided signal,For the start-phase of signal.
It is assumed that the system transfer function in M channel is respectively h1(t)、h2(t)、…、hM(t), then output is respectively as follows:
vk(t)=scal(t)*hk(t) (k=1,2 ..., M)
Above formula becomes after Fourier transform:
Because of the rate-aided signal s of each channel inputcal(t) identical, then its difference respectively exported only with each channel System transfer function inconsistency is related, i.e. v1(t)、v2(t)、…、vM(t) difference between is by h1(t)、h2(t)、…、hM (t) inconsistency between causes.So the amplitude inconsistency of interchannel and Sensor gain and phase perturbations may be expressed as:
Step 5-2) working frequency be fiWhen read first channel calibration data, obtain its amplitude A1,iAnd phaseEnable k=1；
Because of the rate-aided signal s of each channel inputcal(t) identical, then its difference respectively exported is due to interchannel Inconsistency cause, therefore, on the basis of the output in the 1st channel, other channels respectively with the 1st channel output be compared, Resulting range error and phase error are to characterize the inconsistency in the 1st channel and other channels, while can also characterize other Inconsistency between each channel.
Step 5-3) k=k+1 is enabled, read work frequency is fiWhen k-th of channel calibration data, obtain its amplitude Ak,i And phase
Step 5-4) calculate range error Δ ak,iAnd phase error
Δak,i=A1,i/Ak,i
Step 5-5) judge whether k is equal to M, if a determination be made that certainly, it is transferred to step 6)；Otherwise, it is transferred to step 5-3)。
Step 6) is corrected the inconsistency transmission channel；
The nonuniformity correction of interchannel is realized by mutually compensating transmitting signal progress width.It is assumed that working frequency is fi When each transmission channel between range error and phase error be Δ ak,iWithStep 4-3) transmitting signal Become after width mutually compensates:
If being described with plural form, above formula can be indicated are as follows:
Launched after step 7), the corrected emitted machine filter and amplification of transmitting signal by antenna, then again by antenna Its echo is received with receiver；
Step 8) handles echo-signal；Frequency separation is carried out to digital signal during echo signal processing, And inconsistency error carries out Amplitude Compensation and phase compensation to the signal after separation between the receiving channel obtained using step 5), To realize nonuniformity correction between receiving channel；
As shown in figure 8, after AD is sampled, carrying out frequency separation and letter to digital signal by antenna receives echo-signal Number processing, specifically include:
Step 8-1), using digital band-pass filter to echo-signal carry out frequency separation；
The present invention realizes that different wave positions detect simultaneously using multifrequency detection, to improve the temporal resolution of radar.Although The observation wave position of different frequency signals/direction is different, but because it emits simultaneously while receiving, the echo of each frequency signal is blended in Together, it needs to carry out frequency separation to it that the echo data of different direction can be obtained.
The present invention carries out frequency separation using digital filtering method, substitutes tradition pair/multi-receiver and carries out frequency separation Method reduces system complexity and cost while improving system performance.
Step 8-2), by Digital Down Convert to after frequency separation single-frequency segment signal carry out orthogonal detection；
In order to obtain the phase information of echo-signal, needs to carry out orthogonal detection processing to signal, obtain I, Q two-way letter Number.
Step 8-3), to after detection baseband signal carry out low-pass filtering, inhibit interference effect；
Step 8-4), using each inter-channel level error and phase error obtained in step 5), to number after low-pass filtering According to amplitude and phase correction is carried out, reducing interchannel inconsistency influences, and improves system performance；
The bearing calibration of receiver amplitude-phase consistency is similar with transmitter sensor gain and phase uncertainties bearing calibration in step 6), only Calibration object becomes echo-signal by transmitting signal.Receiver range error and phase error, right according to obtained in step 5) Echo-signal is corrected.It is assumed that working frequency is fiWhen receiving channel k range error and phase error be respectively Δ ak,iWithI, Q of respective channel export Ik,iAnd Qk,iIt is respectively as follows:
I, the Q signal of channel k becomes after received machine amplitude-phase consistency correction:
Step 8-5), to after the amplitude and phase correction of the same frequency range in all channels result carry out digital bea mforming, obtain radar Echo data.

Claims (7)

  1. The higher-frequency radar multifrequency detection method 1. a kind of high-performance is concerned with, which comprises
    Step 1) specifies the frequency values of several frequencies and the observation beam of each frequency, is directed toward according to observation beam and determines each frequency Thus the phase shift increments of rate design the transmitting signal in each channel of radar transmitter；Rate-aided signal is designed, using first passage as base Inconsistency error between inconsistency error and receiving channel between quasi- acquisition transmission channel: range error and phase error；It utilizes Inconsistency error carries out Amplitude Compensation and phase compensation to transmitting signal between transmission channel, realizes inconsistency between transmission channel Correction；
    Step 2) will be launched after the compensated emitted machine filter and amplification of transmitting signal by antenna；Then again by antenna and thunder Its echo is received up to receiver；
    Step 3) carries out frequency separation to echo digital signal, and utilizes inconsistency error between the receiving channel of step 1) acquisition Amplitude Compensation and phase compensation are carried out to the signal after separation, realize nonuniformity correction between receiving channel, obtains radar return Data；
    Also include before the step 1): the parameter of setting radar transmitter and radar receiver；The radar transmitter and thunder Parameter up to receiver includes: radar transmitter and radar receiver bandwidth B, single-frequency detection radar transmission power and multifrequency detection Radar transmission power；
    The radar transmitter and radar receiver bandwidth B meet:
    B≥N*Bsub+(N-1)*ΔB
    Wherein, look-in frequency quantity is N, respective bandwidth Bsub, Δ B is the frequency interval of two subbands of filter.
  2. The higher-frequency radar multifrequency detection method 2. high-performance according to claim 1 is concerned with, which is characterized in that the single-frequency is visited Survey radar transmission power PtMeet:
    Wherein, G is antenna gain；λ is radar operation wavelength；σ is the radar reflection section of target；R be target and radar away from From；F is propagation coefficient；kBFor Boltzmann constant；TrFor receiver temperature；
    When realizing that N frequency detects, N frequency detection radar transmission powerAre as follows:
  3. The higher-frequency radar multifrequency detection method 3. high-performance according to claim 2 is concerned with, which is characterized in that the step 1) It specifically includes:
    Step 101) specifies the frequency values of several frequencies and the observation beam of each frequency, is directed toward and is determined respectively according to observation beam Thus the phase shift increments of frequency design the transmitting signal of each frequency in each channel of radar transmitter, by all different frequencies Transmitting signal is overlapped to obtain the transmitting signal in each channel；
    Step 102) designs rate-aided signal, on the basis of first passage, by making comparisons with first passage calibration output, obtains it The deviation of his channel calibration output and first passage, to obtain interchannel inconsistency error: range error and phase error；
    Step 103) carries out Amplitude Compensation and phase compensation to transmitting signal using inconsistency error between transmission channel, realizes hair Penetrate interchannel nonuniformity correction.
  4. The higher-frequency radar multifrequency detection method 4. high-performance according to claim 3 is concerned with, which is characterized in that when the step 101) it is specifically included in:
    Step 101-1) specify the frequency values f of N number of frequency1,f2,…fNAnd the observation beam of each frequency is directed toward: θB,1、 θB,2、…、θB,N；
    Step 101-2) phase shift increments of each frequency are determined according to observation beam
    Wherein, λiFor i-th of look-in frequency fiCorresponding wavelength,C is the light velocity；
    Step 101-3) according to observing frequency and corresponding phase shift increments, design the transmitting letter of each frequency of each transmission channel Number:
    Wherein: sk,i(t) emit the signal of i-th of frequency in signal for transmission channel k；Ak,iEmit in signal for transmission channel k The amplitude of i-th of frequency component, k=1 ... M, M are total number of channels；I=1 ... N；And require | Ak,i|2≤Pt；
    Step 101-4) transmitter channels k transmitting signal sk(t) are as follows:
  5. The higher-frequency radar multifrequency detection method 5. high-performance according to claim 4 is concerned with, which is characterized in that the step 102) it specifically includes:
    Step 102-1) design rate-aided signal；Rate-aided signal scal(t) include all frequency signals:
    Wherein, A is the amplitude of rate-aided signal,For the start-phase of signal；
    Step 102-2) working frequency be fiWhen read first channel calibration data, obtain its amplitude A1,iAnd phase Enable k=1；
    Step 102-3) k=k+1 is enabled, read work frequency is fiWhen k-th of channel calibration data, obtain its amplitude Ak,iAnd phase Position
    Step 102-4) calculate range error Δ aK, iAnd phase error
    Δak,i=A1,i/Ak,i
    Step 102-5) judge whether k is equal to M, if a determination be made that certainly, it is transferred to step 103)；Otherwise, it is transferred to step 102-3)。
  6. The higher-frequency radar multifrequency detection method 6. high-performance according to claim 5 is concerned with, which is characterized in that the step 103) nonuniformity correction of interchannel is realized by carrying out Amplitude Compensation and phase compensation to transmitting signal:
    Working frequency is fi, transmission channel k, k=1,2 ..., the range error and phase error of M is Δ ak,iWithStep Transmitting signal 101-4) becomes after Amplitude Compensation and phase compensation:
    s′k,iIt (t) is compensated transmitting signal；
    It is described with plural form, above formula indicates are as follows:
  7. The higher-frequency radar multifrequency detection method 7. high-performance according to claim 5 is concerned with, which is characterized in that the step 3) It specifically includes:
    Step 3-1) using digital band-pass filter to echo-signal carry out frequency separation；
    Step 3-2) pass through Digital Down Convert to the single-frequency segment signal progress orthogonal detection after frequency separation；
    Step 3-3) low-pass filtering is carried out to the baseband signal after detection；
    Step 3-4) using each inter-channel level error and phase error obtained in step 102), to data after low-pass filtering into Row amplitude and phase correction；
    Working frequency is fi, receiving channel k, k=1,2 ..., the range error and phase error of M is respectively Δ ak,iWithPhase I, the Q in channel is answered to export Ik,iAnd Qk,iIt is respectively as follows:
    I, the Q signal of receiving channel k becomes after received machine amplitude-phase consistency correction:
    Step 3-5) digital bea mforming is carried out to result after the amplitude and phase correction of the same frequency range in all channels, obtain radar return number According to.
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