CN106226761A - A kind of high-performance is concerned with higher-frequency radar multifrequency detection method - Google Patents

Abstract

The invention provides a kind of high-performance to be concerned with higher-frequency radar multifrequency detection method, described method includes: step 1) specify frequency values and the observation beam of each frequency of several frequencies, point to the phase shift increments determining each frequency according to observation beam, thus design the transmitting signal of each passage of radar transmitter；Design calibration signal, obtains between transmission channel discordance error on the basis of first passage and receives interchannel discordance error: range error and phase error；Discordance error between transmission channel is utilized to carry out Amplitude Compensation and phase compensation to launching signal, it is achieved nonuniformity correction between transmission channel；Step 2) will compensate after transmitting signal emitted machine filter and amplification after launched by antenna；Its echo is received the most again by antenna and radar receiver；Step 3) echo digital signal is carried out frequency separation, and utilize step 1) in obtain reception interchannel discordance error carry out Amplitude Compensation and phase compensation, it is thus achieved that radar return data.

Description

A kind of high-performance is concerned with higher-frequency radar multifrequency detection method

Technical field

The present invention relates to Radar Technology field, be concerned with higher-frequency radar multifrequency detection method particularly to a kind of high-performance.

Background technology

International SuperDARN (SuperDARN) be in order in studying high latitude area anomalous of the ionosphere and formed Be concerned with the radar netting that higher-frequency radar battle array forms by tens of grounds.Ground is concerned with the electricity that higher-frequency radar battle array receives according to it Absciss layer echo obtains speed and the spectrum width of ionospheric drift, is further used for setting up ionospheric convection model.

Ionospheric plasma convection current is a kind of form of expression of solar wind-Magnetospheric coupling, with magnetosphere-ionosphere system electricity Dynamic process has close contact.The direction of interplanetary magnetic field (IMF) and size are the determiners affecting ionospheric convection, IMF north-south component determines the basic structure of convection current and the intensity of convection current and space scale, and IMF thing component mainly affect right The unsymmetry in morning and evening of stream.Under the conditions of quasistatic iMF, the statistical nature of ionospheric convection has been had the most deeply by people Understanding and understanding.But, some key issues of the transient response process that solar wind is changed by ionospheric convection need into One step research.The temporal resolution of the ionospheric convection of SuperDARN observation at present is 1-2min, if improving temporal resolution, Will assist in us and study the ionospheric convection more accurate transient response process to solar wind disturbance, if ionospheric convection is to too The response that wind syndrome caused by excess of YANG dynamic pressure strengthens, ionosphere is drilled travelling Convection cell (Traveling convection vortex, TCV's) Change process.Therefore, the temporal resolution improving radar is the most significant to research ionospheric convection model.

In order to improve detection time resolution, SuperDARN radar generally uses special scan mode, it is achieved to a certain Individual ripple position/direction carries out high time resolution detection, and the temporal resolution in other ripple position/directions then can decrease.Utilize Different ripple position/directions are observed by two frequencies simultaneously, are increasing substantially temporal resolution same in some important orientation Time, the most do not reduce the temporal resolution in other ripple position/directions, the most slightly improve.Detect according to multifrequency, then can significantly carry High time resolution.

At present, the effect increasing receiver channel, reaching " (transmitter) double receipts (receiver) " is generally used in the world Really, it is achieved in dual frequency sounder.The feature of this method is simple direct on signal processing, but can increase system complexity and become This, the most therefore limit the realization of multifrequency detection method；Further, since the imperfection of hardware, use the system of " double receipts " The interchannel discordance of reception can be introduced by band, reduce certainty of measurement.

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 The means of bright employing Digital Signal Processing, in conjunction with internal calibration method, by launching signal, the conjunction of transmitter and receiver bandwidth Reason design, it is achieved high-performance multifrequency detects.Than the method increasing receiver channel, present invention, avoiding increase analog circuit band The all imperfection errors come, improve systematic function, reduce system complexity and cost simultaneously；The present invention is also by internal calibration Realize the amplitude phase error of transmitter, receiver is corrected, reduce the impact of interchannel discordance, improve system further Performance, thus obtain the measurement data of higher precision, it is achieved high-performance multifrequency detects.The method of the present invention have high flexibility, High-performance, the feature of low cost.

To achieve these goals, the invention provides a kind of high-performance high-frequency radar multifrequency detection method, including:

Step 1) specify frequency values and the observation beam of each frequency of several frequencies, point to according to observation beam and determine The phase shift increments of each frequency, thus designs the transmitting signal of each passage of radar transmitter；Design calibration signal, with first passage On the basis of obtain between transmission channel discordance error and receive interchannel discordance error: range error and phase error； Discordance error between transmission channel is utilized to carry out Amplitude Compensation and phase compensation to launching signal, it is achieved to differ between transmission channel Cause corrects；

Step 2) will compensate after transmitting signal emitted machine filter and amplification after launched by antenna；The most again by antenna Its echo is received with radar receiver；

Step 3) echo digital signal is carried out frequency separation, and utilize step 1) the reception interchannel discordance that obtains Error carries out Amplitude Compensation and phase compensation to the signal after separating, thus realizes receiving interchannel nonuniformity correction, it is thus achieved that Radar return data.

In technique scheme, described step 1) also comprise before: set radar transmitter and the parameter of radar receiver； The parameter of described radar transmitter and radar receiver includes: radar transmitter and radar receiver bandwidth B, single-frequency detection radar Launch power and multifrequency detection radar launches power.

In technique scheme, described radar transmitter and radar receiver bandwidth B meet:

B≥N*B_sub+(N-1)*ΔB

Wherein, look-in frequency quantity is N, and respective bandwidth is B_sub, Δ B is the frequency interval of two subbands of wave filter.

In technique scheme, described single-frequency detection radar launches power P_tMeet:

$P_t>k_B{T}_{r}B\·\frac{{\left(4\mathrm{\π}\right)}^3{R}^4}{G^2{\mathrm{\λ}}^2\mathrm{\σ}F}$

Wherein, G is antenna gain；λ is radar operation wavelength；σ is the radar reflection cross section of target；R is target and radar Distance；F is propagation coefficient；k_BFor Boltzmann constant；T_rFor receiver temperature；

When realizing N frequency detection, N frequency detection radar launches power P_t ^(N)For:

P_t ^(N)=NP_t。

In technique scheme, described step 1) specifically include:

Step 101) specify frequency values and the observation beam of each frequency of several frequencies, point to really according to observation beam The phase shift increments of fixed each frequency, thus the transmitting signal of each frequency of the design each passage of radar transmitter, by all differences Frequency emissioning signal is overlapped obtaining the transmitting signal of each passage；

Step 102) design calibration signal, on the basis of first passage, by making comparisons with first passage calibration output, To the deviation of the calibration output of other passages with first passage, thus obtain interchannel discordance error: range error and phase place Error；

Step 103) utilize discordance error between transmission channel to carry out Amplitude Compensation and phase compensation to launching signal, real Nonuniformity correction between existing transmission channel.

In technique scheme, when described step 101) in specifically include:

Step 101-1) specify the frequency values f of N number of frequency₁,f₂,…f_N, and the observation beam sensing of each frequency: θ_B,1、 θ_B,₂、…、θ_B,N；

Step 101-2) phase shift increments of each frequency is determined according to observation beam

Wherein, λ_iFor i-th look-in frequency f_iCorresponding 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: s_k,iT () is that transmission channel k launches the signal of i-th frequency in signal；A_k,iLetter is launched for transmission channel k The amplitude of i-th frequency component, k=1 in number ... M, M are total number of channels；I=1 ... N；And require | A_k,i|²≤P_t；

Step 101-4) the transmitting signal s of transmitter channels k_k(t) be:

$s_k\left(t\right)=\underset{i=1}{\overset{N}{\Σ}}{s}_{k,i}\left(t\right).$

In technique scheme, described step 102) specifically include:

Step 102-1) design calibration signal；Calibration signal s_calT () comprises all frequency signals:

Wherein, A is the amplitude of calibration signal,Start-phase for signal；

Step 102-2) it is f in operating frequency_iTime read first passage calibration data, obtain its amplitude A_1,iAnd phase PositionMake k=1；

Step 102-3) to make k=k+1, read work frequency be f_iTime kth passage calibration data, obtain its amplitude A_k,iAnd phase place

Step 102-4) calculate range error Δ a_k,iAnd phase error

Δa_k,i=A_1,i/A_k,i

Step 102-5) judge whether k is equal to M, if a determination be made that certainly, proceed to step 103)；Otherwise, proceed to Step 102-3).

In technique scheme, described step 103) interchannel nonuniformity correction by carrying out width to launching signal Degree compensates and phase compensation realizes:

Operating frequency is f_i, transmission channel k, k=1,2 ..., the range error of M and phase error are Δ a_k,iWith Step 101-4) transmitting signal become after Amplitude Compensation and phase compensation:

s′_{K, i}T () is the transmitting signal after compensating；

Describing with plural form, above formula is expressed as:

In technique scheme, described step 3) specifically include:

Step 3-1) utilize digital band-pass filter that echo-signal is carried out frequency separation；

Step 3-2) by Digital Down Convert, the one-segment signal after frequency separation is carried out orthogonal detection；

Step 3-3) baseband signal after detection is carried out low-pass filtering；

Step 3-4) utilize step 102) in obtain each inter-channel level error and phase error, to after low-pass filtering number According to carrying out amplitude and phase correction；

Operating frequency is f_i, receive passage k, k=1,2 ..., the range error of M and phase error are respectively Δ a_k,iWithI, Q of respective channel exports I_k,iAnd Q_k,iIt is respectively as follows:

Receive the I of passage k after being received the correction of machine amplitude-phase consistency, Q signal becomes:

Step 3-5) frequency range same to all passages amplitude and phase correction after result carry out digital bea mforming, it is thus achieved that radar returns Wave datum.

It is an advantage of the current invention that:

1, the method for the present invention utilizes digital signal processing method to realize multifrequency detection, it is not necessary to multi-receiver, improves system System performance, reduces system cost and system complexity simultaneously；

2, the method for the present invention utilizes digital processing mode to substitute multi-receiver and realizes multifrequency detection, it is possible to better ensure that The each interchannel concordance of radar battle array, improves radar system performance；

3, inter-channel level error and phase error are corrected by the method for the present invention by internal calibration, reduce system by mistake Difference impact, improves radar system performance.

Accompanying drawing explanation

Fig. 1 is the high-performance coherent radar multifrequency detection method flow chart of the present invention；

Ripple bit scan schematic diagram when Fig. 2 is single-frequency detection；

Ripple bit scan schematic diagram when Fig. 3 is to utilize three frequency detection raising temporal resolutions；

Fig. 4 be linear array antenna battle array battle array in phase compensation schematic diagram；

Fig. 5 is the transmitting Design of Signal flow chart of the present invention；

Fig. 6 is pulse time diagram；

Fig. 7 is that the multichannel of the present invention calibrates for error process chart；

Fig. 8 is the multifrequency echo signal processing flow chart of the present invention.

Detailed description of the invention

The present invention will be further described in detail with specific embodiment below in conjunction with the accompanying drawings.

A kind of high-performance is concerned with higher-frequency radar multifrequency detection method, as it is shown in figure 1, described method includes:

Step 1), determine look-in frequency scope according to target property, and according to detection demand determine look-in frequency quantity N and Bandwidth B_sub；

Step 2), according to the look-in frequency quantity determined and bandwidth, transmitter bandwidth and receiver bandwidth are designed；

Determining that look-in frequency quantity is N, respective bandwidth is B_sub, it is considered to the actual cut-off frequency of wave filter is more than bandwidth, for Avoid the interference between different frequency range as far as possible, it is desirable to the bandwidth B of transmitter and receiver meets following condition:

B≥N*B_sub+(N-1)*ΔB (1)

In above formula, Δ B is the frequency interval of two subbands of wave filter.

Step 3), according to factors such as detection range, receiver performance and look-in frequency quantity, radar transmission power is carried out Design；Specifically include:

Step 3-1), determine detection range and the receiver sensitivity of radar；

Step 3-2), estimate radar working frequency range Background Noise Power；

Step 3-3), according to factors such as detection range, target property, receiver performances, determine carry out single-frequency detection time send out Penetrate power demand；

It is relevant, also with antenna gain, detection range, mesh that the echo power that radar receives depends not only on transmitting power The factors such as mark characteristic are relevant.Echo power and the relation launched between power of radar generally describe with radar equation:

$P_r=\frac{P_t{G}^2{\mathrm{\λ}}^2\mathrm{\σ}F}{{\left(4\mathrm{\π}\right)}^3{R}^4}---\left(2\right)$

Wherein, P_rAnd P_tIt is respectively radar return power and launches power；G is antenna gain；λ is radar operation wavelength；σ Radar reflection cross section for target；R is the distance of target and radar；The propagation coefficient that F is path attenuation and other factors cause.

Radar cannot directly record target echo power, the total reception being made up of target echo and system noise recorded Power；Total received power P_sFor:

P_s=P_r+P_n (3)

Wherein: P_nFor receiver noise power.And receiver noise intensity and its bandwidth B and receiver temperature T_rBetween close System is shown below:

P_n=k_BT_rB (4)

In above formula: k_BFor Boltzmann constant.Extract effective echo information in order in the signal that receives from radar, send out Penetrate power P_tDesign time need ensure radar reception power P_rMore than receiver noise P_n, i.e.

P_r＞ P_n (5)

(2) formula and (4) formula are substituted in (5) formula,

$\frac{P_t{G}^2{\mathrm{\λ}}^2\mathrm{\σ}F}{{\left(4\mathrm{\π}\right)}^3{R}^4}>k_B{T}_{r}B---\left(6\right)$

I.e. launch power P_tNeed to meet following formula:

$P_t>k_B{T}_{r}B\·\frac{{\left(4\mathrm{\π}\right)}^3{R}^4}{G^2{\mathrm{\λ}}^2\mathrm{\σ}F}---\left(7\right)$

Step 3-4), according to look-in frequency quantity, determine when multifrequency detects transmitting power；

By step 3-3) determine that the transmitting power needed when single-frequency detects is P_t, then need to send out during N to be realized frequency detection Penetrate acc power P_t ^(N)For:

P_t ^(N)=NP_t

Step 4), according to multifrequency detection observed pattern to launch signal be designed；

In order to improve temporal resolution, it is desirable to launch signal and be made up of multi-frequency signal, and each frequency signal is through wave beam Detection direction after synthesis is different, is observed multiple different directions (ripple position) the most simultaneously, thus shortens observation cycle, improves Temporal resolution；

As a example by three frequency observations, radar observation region is divided into 24 ripple positions, when using single-frequency to detect (see Fig. 2), The observation cycle completing 24 ripple position observations is 24T_d(T_dIt is the residence time of a ripple position)；Detect according to 3 frequencies (see Fig. 3), observation cycle can reduce to 8T_d, i.e. temporal resolution improves 2 times.Specifically it is shown in Table 1:

Table 1

As shown in Figure 4, for the phased-array radar that antenna array is linear array at equal intervals, if beam position is θ_B, then phase is required The phase shift increments launched between signal of adjacent unitFor:

Wherein, λ is radar operation wavelength, and d is adjacent antenna spacing.

When utilizing multifrequency detection to improve temporal resolution, the signal of multiple frequency, and each frequency are carried in each pulse simultaneously The beam position of rate is different, i.e. realizes many ripples position and detects simultaneously.

As it is shown in figure 5, described step 4) specifically include:

Step 4-1) specify the frequency values f1, f of N number of frequency₂,…f_N, and the observation beam sensing of each frequency: θ_B,1、 θ_B,2、…、θ_B,N；

Step 4-2) phase shift increments of each frequency is determined according to observation beam

Wherein, λ_iFor i-th look-in frequency f_iCorresponding wavelength,C is the light velocity.

It addition, for SuperDARN radar, owing to its detection range yardstick is big, and target speed is high simultaneously, in order to The contradiction that solution range ambiguity and doppler velocity obscure, generally uses the multipulse sequence of unequal interval distribution to transmitting signal Carry out amplitude modulation(PAM) (see Fig. 6).

Step 4-3) according to observing frequency and corresponding phase shift increments, design the transmitting signal of each frequency of each passage:

Wherein: s_k,iT () is that passage k launches the signal of i-th frequency in signal；A_k,iI-th in signal is launched for passage k The amplitude of frequency component, k=1 ... M, M are total number of channels；I=1 ... N；And require | A_k,i|²≤P_t。

Step 4-4) detect to realize multifrequency many ripples position simultaneously, it is desirable to the signal that each pulse is carried is multiple-frequency signal, The then transmitting signal s of passage k_k(t) be:

$s_k\left(t\right)=\underset{i=1}{\overset{N}{\Σ}}{s}_{k,i}\left(t\right).$

Step 5), the width that obtains between the interchannel range error of transmitter and receiver and phase error, i.e. Acquisition channel Degree discordance error and Sensor gain and phase perturbations error；

As it is shown in fig. 7, described step 5) specifically include:

Step 5-1) design calibration signal；

Different from launching signal, calibration signal is for carrying out the range error of transmitter and receiver and phase error Correction, does not has specific requirement to synthesis beam position.In order to simplify the processing procedure of calibration data, each passage all uses identical Calibration signal.

Further, since the frequency characteristic of passage, for same passage, the change in gain of different frequency signals and Phase delay It is different.Therefore, when carrying out multifrequency detection, need the amplitude phase error of all frequencies is corrected.In order to realize multifrequency point Amplitude phase error be corrected simultaneously, calibration signal comprises all frequency signals, for:

Wherein, A is the amplitude of calibration signal,Start-phase for signal.

Assuming that the system transfer function of M passage is respectively h₁(t)、h₂(t)、…、h_MT (), then output is respectively as follows:

v_k(t)=s_cal(t)*h_k(t) (k=1,2 ..., M)

Above formula becomes after Fourier transform:

Because calibration signal s of each passage input_calT () is identical, then its difference each exported only with each passage System transfer function discordance is relevant, i.e. v₁(t)、v₂(t)、…、v_MT the difference between () is by h₁(t)、h₂(t)、…、h_M T the discordance between () causes.The most interchannel amplitude discordance and Sensor gain and phase perturbations are represented by:

Step 5-2) it is f in operating frequency_iTime read first passage calibration data, obtain its amplitude A_1,iAnd phase placeMake k=1；

Because calibration signal s of each passage input_calT () is identical, then its difference each exported is due to interchannel Discordance cause, therefore, be output as benchmark with the 1st passage, other passages respectively with the 1st passage output compare, The range error of gained and phase error i.e. characterize the discordance of the 1st passage and other passages, also can characterize other simultaneously Discordance between each passage.

Step 5-3) to make k=k+1, read work frequency be f_iTime kth passage calibration data, obtain its amplitude A_k,i And phase place

Step 5-4) calculate range error Δ a_k,iAnd phase error

Δa_k,i=A_1,i/A_k,i

Step 5-5) judge whether k is equal to M, if a determination be made that certainly, proceed to step 6)；Otherwise, step is proceeded to 5-3)。

Step 6) discordance between transmission channel is corrected；

Interchannel nonuniformity correction is by carrying out width and compensate mutually and realize launching signal.Assuming that operating frequency is f_i Time each transmission channel between range error and phase error be Δ a_k,iWithStep 4-3) transmitting signal Become after width compensates mutually:

If describing with plural form, above formula can be expressed as:

Step 7), launched by antenna, the most again by antenna after calibrated transmitting signal emitted machine filter and amplification Its echo is received with receiver；

Step 8), echo-signal is processed；During echo signal processing, digital signal is carried out frequency separation, And utilize step 5) obtain receive interchannel discordance error to separate after signal carry out Amplitude Compensation and phase compensation, Thus realize receiving interchannel nonuniformity correction；

As shown in Figure 8, receive echo-signal by antenna, after AD samples, digital signal is carried out frequency separation and letter Number process, specifically include:

Step 8-1), utilize digital band-pass filter that echo-signal is carried out frequency separation；

The present invention utilizes multifrequency detection to realize different ripple position and detects simultaneously, thus improves the temporal resolution of radar.Although The observation ripple position of different frequency signals/direction is different, but launches because of it simultaneously and receive simultaneously, and the echo of each frequency signal is blended in Together, need that it is carried out frequency separation and can obtain the echo data of different azimuth.

The present invention uses digital filtering method to carry out frequency separation, substitutes traditional double/multi-receiver and carries out frequency separation Method, reduces system complexity and cost while improving systematic function.

Step 8-2), by Digital Down Convert, the one-segment signal after frequency separation is carried out orthogonal detection；

In order to obtain the phase information of echo-signal, need signal is carried out orthogonal detection process, it is thus achieved that I, Q two-way is believed Number.

Step 8-3), the baseband signal after detection is carried out low-pass filtering, suppress interference effect；

Step 8-4), utilize step 5) in obtain each inter-channel level error and phase error, to after low-pass filtering number According to carrying out amplitude and phase correction, reduce the impact of interchannel discordance, improve systematic function；

Receiver amplitude-phase consistency bearing calibration and step 6) in transmitter sensor gain and phase uncertainties bearing calibration similar, simply Calibration object is become echo-signal by launching signal.According to step 5) in the receiver range error that obtains and phase error, right Echo-signal is corrected.Assuming that operating frequency is f_iTime receive the range error of passage k and phase error is respectively Δ a_k,iWithI, Q of respective channel exports I_k,iAnd Q_k,iIt is respectively as follows:

After being received the correction of machine amplitude-phase consistency, the I of passage k, Q signal become:

Step 8-5), result carries out digital bea mforming after the amplitude and phase correction of frequency range same to all passages, it is thus achieved that radar Echo data.

Claims (9)

1. high-performance is concerned with a higher-frequency radar multifrequency detection method, and described method includes:

Step 1) specify frequency values and the observation beam of each frequency of several frequencies, point to according to observation beam and determine each frequency The phase shift increments of rate, thus designs the transmitting signal of each passage of radar transmitter；Design calibration signal, with first passage as base Discordance error and reception interchannel discordance error between quasi-acquisition transmission channel: range error and phase error；Utilize Between transmission channel, discordance error carries out Amplitude Compensation and phase compensation to launching signal, it is achieved discordance between transmission channel Correction；

Step 2) will compensate after transmitting signal emitted machine filter and amplification after launched by antenna；The most again by antenna and thunder Reach receiver and receive its echo；

Step 3) echo digital signal is carried out frequency separation, and utilize step 1) the reception interchannel discordance error that obtains Signal after separating is carried out Amplitude Compensation and phase compensation, it is achieved receive interchannel nonuniformity correction, it is thus achieved that radar return Data.

High-performance the most according to claim 1 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described step 1) The most also comprise: set radar transmitter and the parameter of radar receiver；Described radar transmitter and the parameter of radar receiver Including: radar transmitter and radar receiver bandwidth B, single-frequency detection radar launch power and multifrequency detection radar launches power.

High-performance the most according to claim 2 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described radar is sent out Penetrate machine and radar receiver bandwidth B meet:

B≥N*B_sub+(N-1)*ΔB

Wherein, look-in frequency quantity is N, and respective bandwidth is B_sub, Δ B is the frequency interval of two subbands of wave filter.

High-performance the most according to claim 3 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described single-frequency is visited Survey radar transmission power P_tMeet:

$P_t>k_B{T}_{r}B\·\frac{{\left(4\mathrm{\π}\right)}^3{R}^4}{G^2{\mathrm{\λ}}^2\mathrm{\σ}F}$

Wherein, G is antenna gain；λ is radar operation wavelength；σ is the radar reflection cross section of target；R be target with radar away from From；F is propagation coefficient；k_BFor Boltzmann constant；T_rFor receiver temperature；

When realizing N frequency detection, N frequency detection radar launches power P_t ^(N)For:

P_t ^(N)=NP_t。

High-performance the most according to claim 4 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described step 1) Specifically include:

Step 101) specify frequency values and the observation beam of each frequency of several frequencies, point to according to observation beam determine each The phase shift increments of frequency, thus the transmitting signal of each frequency of the design each passage of radar transmitter, by all different frequencies Launch signal and be overlapped obtaining the transmitting signal of each passage；

Step 102) design calibration signal, on the basis of first passage, by making comparisons with first passage calibration output, obtain it He exports the deviation with first passage at passage calibration, thus obtains interchannel discordance error: range error and phase error；

Step 103) utilize discordance error between transmission channel to carry out Amplitude Compensation and phase compensation to launching signal, it is achieved send out Penetrate interchannel nonuniformity correction.

High-performance the most according to claim 5 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that when described step 101) specifically include in:

Step 101-1) specify the frequency values f of N number of frequency₁,f₂,…f_N, and the observation beam sensing of each frequency: θ_B,1、 θ_B,2、…、θ_B,N；

Step 101-2) phase shift increments of each frequency is determined according to observation beam

Wherein, λ_iFor i-th look-in frequency f_iCorresponding 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: s_k,iT () is that transmission channel k launches the signal of i-th frequency in signal；A_k,iLaunch in signal for transmission channel k The amplitude of i-th frequency component, k=1 ... M, M are total number of channels；I=1 ... N；And require | A_k,i|²≤P_t；

Step 101-4) the transmitting signal s of transmitter channels k_k(t) be:

$s_k\left(t\right)=\underset{i=1}{\overset{N}{\Σ}}{s}_{k,i}\left(t\right).$

High-performance the most according to claim 6 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described step 102) specifically include:

Step 102-1) design calibration signal；Calibration signal s_calT () comprises all frequency signals:

Wherein, A is the amplitude of calibration signal,Start-phase for signal；

Step 102-2) it is f in operating frequency_iTime read first passage calibration data, obtain its amplitude A_1,iAnd phase place Make k=1；

Step 102-3) to make k=k+1, read work frequency be f_iTime kth passage calibration data, obtain its amplitude A_k,iAnd phase Position

Step 102-4) calculate range error Δ a_{K, i}And phase error

Δa_k,i=A_1,i/A_k,i

Step 102-5) judge whether k is equal to M, if a determination be made that certainly, proceed to step 103)；Otherwise, step is proceeded to 102-3)。

High-performance the most according to claim 7 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described step 103) interchannel nonuniformity correction is by carrying out Amplitude Compensation and phase compensation realizes to launching signal:

Operating frequency is f_i, transmission channel k, k=1,2 ..., the range error of M and phase error are Δ a_k,iWithStep Transmitting signal 101-4) becomes after Amplitude Compensation and phase compensation:

s′_k,iT () is the transmitting signal after compensating；

Describing with plural form, above formula is expressed as:

High-performance the most according to claim 7 is concerned with higher-frequency radar multifrequency detection method, it is characterised in that described step 3) Specifically include:

Step 3-1) utilize digital band-pass filter that echo-signal is carried out frequency separation；

Step 3-2) by Digital Down Convert, the one-segment signal after frequency separation is carried out orthogonal detection；

Step 3-3) baseband signal after detection is carried out low-pass filtering；

Step 3-4) utilize step 102) in obtain each inter-channel level error and phase error, data after low-pass filtering are entered Row amplitude and phase correction；

Operating frequency is f_i, receive passage k, k=1,2 ..., the range error of M and phase error are respectively Δ a_k,iWithPhase I, Q of answering passage export I_k,iAnd Q_k,iIt is respectively as follows:

Receive the I of passage k after being received the correction of machine amplitude-phase consistency, Q signal becomes:

Step 3-5) frequency range same to all passages amplitude and phase correction after result carry out digital bea mforming, it is thus achieved that radar return number According to.