CN104375132B - Digital Array Radar multi-channel analog passage relative time delay measurement apparatus and method - Google Patents

Abstract

The invention discloses Digital Array Radar multi-channel analog passage relative time delay measurement apparatus and method.The method includes: collection is through multiple wideband correlation of the multi-channel analog passage of coupling network, and obtains multichannel base band I/Q signal after analog-and digital-mixing；Multichannel base band I/Q signal is intercepted identical counting from identical distance segment and obtains multiple phase curve；Subtract each other the variation relation obtaining multiple phase difference φ t in time respectively with the phase curve of Standard ideal with multiple phase curves, and fitting a straight line obtains multiple slope k, thus respectively obtain the wideband correlation multiple time delays relative to the wideband correlation of Standard ideal of multi-channel analog passage；After deducting, with multiple time delays, the time delay that respective analog channel coupling network brings, subtract each other, as reference, the time delay of the every other road analog channel time delay respectively and as this road analog channel of reference, the relative time delay finally given between each passage again using the time delay of the most a certain road analog channel.

Description

Digital Array Radar multi-channel analog passage relative time delay measurement apparatus and method

Technical field

The present invention relates to electronic information technical field, particularly relate to be applied to the Digital Arrays of wideband digital array radar industry Row radar multi-channel analog passage relative time delay measurement apparatus and method.

Background technology

Phased-array radar has beam scanning and the agile ability of agility, can realize multiple target intercepting and capturing, tracking, self adaptation etc. Advantage.And the signal of big instant bandwidth can improve the antijamming capability of phased-array radar, have higher range accuracy and point The imaging of resolution, beneficially target, identify and classify.Therefore, wide band net technology is modern radar technology development One of Main way.

In array radar system, due to the difference of the assembly such as cable, analog device, signal is by multi-channel analog passage Time delay is different, and traditional phased-array radar arrives the phase difference of receiver by measuring multiple interchannel center frequency point signals Approximate the delay inequality that the assembly such as compensating cable, analog device brings.For narrow band signal system, the method is feasible.But For wideband signaling system, owing to different frequencies is different to phase place produced by identical time delay, it is impossible to use center frequency point Phase place replace, it is therefore desirable to accurately measure the interchannel relative time delay of multi-channel analog, and then signal carried out compensation of delay.

Summary of the invention

Present invention solves the technical problem that and be, wideband array radar system is accurately measured the relative of multi-channel analog passage Time delay, provides foundation for follow-up compensation of delay and broadband signal beam scanning.Therefore, the present invention provides a kind of Digital Array Radar Multi-channel analog passage relative time delay measurement apparatus and Digital Array Radar multi-channel analog passage relative time delay measuring method thereof, it is full The demand that in foot breadth band Digital Array Radar system, multi-channel analog passage relative time delay is accurately measured.

The present invention is achieved by the following technical solutions: a kind of Digital Array Radar multi-channel analog passage relative time delay is surveyed Amount device, comprising:

Base band I/Q signal acquisition module: it is for gathering multiple wide-band linearity of the multi-channel analog passage through coupling network FM signal, and after analog-and digital-mixing, obtain multichannel base band I/Q signal；

Phase curve acquisition module, it is for intercepting identical counting to this multichannel base band I/Q signal from identical distance segment Obtain multiple phase curve；

Delay acquisition module, its with the plurality of phase curve respectively with the phase place of the wideband correlation of Standard ideal Curve subtracts each other the variation relation obtaining multiple phase difference φ t in time, and fitting a straight line obtains multiple slope k, many according to this The variation relation of individual phase difference φ t in time and corresponding slope k respectively obtain the wide-band LFM of multi-channel analog passage Signal is relative to multiple time delays of the wideband correlation of Standard ideal；

Relative time delay acquisition module, it is for deducting, with the plurality of time delay, the time delay that respective analog channel coupling network brings After, then using the time delay of the most a certain road analog channel as reference, the time delay of every other road analog channel respectively with as ginseng The relative time delay finally given between each passage is subtracted each other in the time delay of Kao Zhe road analog channel.

As the further improvement of such scheme, this phase curve acquisition module same reception passage, same correction connect Receipts machine gathers the wideband correlation of the multi-channel analog passage through coupling network.

As the further improvement of such scheme, this coupling network is passive.

As the further improvement of such scheme, the way of this analog channel is two-way:

One road signal is intermediate frequency f₀, bandwidth B, pulsewidth T₀, time delay t₀, initial phase deviation φ₀Linear FM signal, its Phase place expression formula is:

Another linear FM signal is no-delay and phase deviation, then have: Two paths of signals phase place is subtracted each other, then have:

$\begin{array}{c}\mathrm{\Δ}\mathrm{\φ}(t,t_0,{\mathrm{\φ}}_0)\\ ={\mathrm{\φ}}_{ch1}(t,t_0,{\mathrm{\φ}}_0)-{\mathrm{\φ}}_{ch2}(t,0,0)\\ =2\mathrm{\π}(f_0-\frac{B}{2})(t-t_0)+\mathrm{\π}\frac{B}{T_0}{(t-t_0)}^2+{\mathrm{\φ}}_0-\left(2\mathrm{\π}\right(f_0-\frac{B}{2})t+\mathrm{\π}\frac{B}{T_0}{t}^2)\\ =-2\mathrm{\π}\frac{B}{T_0}{t}_{0}t+\mathrm{\π}\frac{B}{T_0}{t_0}^2-2\mathrm{\π}(f_0-\frac{B}{2})t_0+{\mathrm{\φ}}_0\end{array};$

Two-way phase difference φ (t, t₀,φ₀) linear with time t, it is carried out a beeline y=kx+b matching, obtains Slope k and intercept b, then have

Obtain the relative time delay t of two-way linear FM signal₀With relative initial phase φ₀It is respectively as follows:

$t_0=-\frac{T_{0}k}{2\mathrm{\π}B},{\mathrm{\φ}}_0=b-\mathrm{\π}\frac{B}{T_0}{t_0}^2+2\mathrm{\π}(f_0-\frac{B}{2})t_0=b-\frac{T_0{k}^2}{4\mathrm{\π}B}-(f_0-\frac{B}{2})\frac{T_{0}k}{B}.$

The present invention also provides for a kind of Digital Array Radar multi-channel analog passage relative time delay measuring method, and it includes following step Rapid:

Collection, through the wideband correlation of the multi-channel analog passage of coupling network, obtains after analog-and digital-mixing To multichannel base band I/Q signal；

This multichannel base band I/Q signal is intercepted identical counting from identical distance segment and obtains multiple phase curve；

Subtract each other with the phase curve of the wideband correlation of Standard ideal respectively with the plurality of phase curve obtain many The variation relation of individual phase difference φ t in time, and fitting a straight line obtains multiple slope k, according to the plurality of phase difference φ with The variation relation of time t and corresponding slope k respectively obtain the wideband correlation of multi-channel analog passage relative to standard Preferably multiple time delays of wideband correlation；

After deducting, with the plurality of time delay, the time delay that respective analog channel coupling network brings then logical with the simulation of the most a certain road The time delay in road as reference, the time delay of every other road analog channel respectively with the time delay phase of this road analog channel as reference Subtract the relative time delay finally given between each passage.

As the further improvement of such scheme, gather through catenet with same reception passage, same correction receiver The wideband correlation of the multi-channel analog passage of network.

As the further improvement of such scheme, this coupling network is passive.

As the further improvement of such scheme, the way of this analog channel is two-way:

One road signal is intermediate frequency f₀, bandwidth B, pulsewidth T₀, time delay t₀, initial phase deviation φ₀Linear FM signal, its Phase place expression formula is:

Another linear FM signal is no-delay and phase deviation, then have: Two paths of signals phase place is subtracted each other, then have:

$\begin{array}{c}\mathrm{\Δ}\mathrm{\φ}(t,t_0,{\mathrm{\φ}}_0)\\ ={\mathrm{\φ}}_{ch1}(t,t_0,{\mathrm{\φ}}_0)-{\mathrm{\φ}}_{ch2}(t,0,0)\\ =2\mathrm{\π}(f_0-\frac{B}{2})(t-t_0)+\mathrm{\π}\frac{B}{T_0}{(t-t_0)}^2+{\mathrm{\φ}}_0-\left(2\mathrm{\π}\right(f_0-\frac{B}{2})t+\mathrm{\π}\frac{B}{T_0}{t}^2)\\ =-2\mathrm{\π}\frac{B}{T_0}{t}_{0}t+\mathrm{\π}\frac{B}{T_0}{t_0}^2-2\mathrm{\π}(f_0-\frac{B}{2})t_0+{\mathrm{\φ}}_0\end{array};$

Two-way phase difference φ (t, t₀,φ₀) linear with time t, it is carried out a beeline y=kx+b matching, obtains Slope k and intercept b, then have

Obtain the relative time delay t of two-way linear FM signal₀With relative initial phase φ₀It is respectively as follows:

$t_0=-\frac{T_{0}k}{2\mathrm{\π}B},{\mathrm{\φ}}_0=b-\mathrm{\π}\frac{B}{T_0}{t_0}^2+2\mathrm{\π}(f_0-\frac{B}{2})t_0=b-\frac{T_0{k}^2}{4\mathrm{\π}B}-(f_0-\frac{B}{2})\frac{T_{0}k}{B}.$

Compared with prior art, the invention have the benefit that

1, the time delay of gained is obtained by fitting a straight line, can improve certainty of measurement；

2, frequency content signals all in full bandwidth being carried out fitting a straight line, the time delay recorded is the group delay that signal is overall Time, the overall permanence of representation signal；

3, signal lag is tried to achieve by then passing through straight slope, unrelated with receiving start-phase, phase ambiguity need not be considered The impact brought；

4, measured time delay is the relative time delay between each passage rather than definitely time delay, represents interchannel time delay Difference, is also the part needing in real work to compensate；

5, use same reception passage, same correction receiver to gather signal, active correction can be removed and receive passage The measure error that otherness is brought, improves the stability of systematic survey；

6, the reception coupling network used is passive, can accurately measure each interchannel absolute time delay.

Accompanying drawing explanation

Fig. 1 is the measuring principle schematic block diagram of the present invention.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and embodiment, The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, It is not intended to limit the present invention.

The present invention is directed to the measurement problem of analog channel relative time delay in existing wideband digital array radar system, carry Going out a kind of Digital Array Radar multi-channel analog passage relative time delay measurement apparatus and method, this device and method is adjusted with wide-band linearity Frequently signal carries out the measurement of relative time delay as test signal.For wideband correlation, phase place is in secondary in time Curvilinear motion, and the difference that there are two phase curves of relative time delay is straight line, by carrying out this phase difference straight line Fitting a straight line, can obtain the relative time delay between passage, provides for follow-up compensation of delay and broadband signal beam scanning and depends on According to.

The Digital Array Radar multi-channel analog passage relative time delay measurement apparatus of the present invention includes that base band I/Q signal obtains mould Block, phase curve acquisition module, delay acquisition module, relative time delay acquisition module.

This base band I/Q signal acquisition module is for gathering multiple wide-band linearity of the multi-channel analog passage through coupling network FM signal, and after analog-and digital-mixing, obtain multichannel base band I/Q signal.This phase curve acquisition module is preferably with same Reception passage, same correction receiver gather the wideband correlation of the multi-channel analog passage through coupling network.Use Same reception passage, same correction receiver gather signal, can remove active correction and receive the survey that the otherness of passage is brought Amount error, improves the stability of systematic survey.This coupling network is passive, can accurately measure each interchannel absolute time delay.

This phase curve acquisition module is for intercepting identical counting to this multichannel base band I/Q signal from identical distance segment Obtain multiple phase curve.

This delay acquisition module with the plurality of phase curve respectively with the phase place of the wideband correlation of Standard ideal Curve subtracts each other the variation relation obtaining multiple phase difference φ t in time, and fitting a straight line obtains multiple slope k, many according to this The variation relation of individual phase difference φ t in time and corresponding slope k respectively obtain the wide-band LFM of multi-channel analog passage Signal is relative to multiple time delays of the wideband correlation of Standard ideal.The time delay of gained is to be obtained by fitting a straight line , certainty of measurement can be improved, it addition, frequency content signals all in full bandwidth are carried out fitting a straight line, the time delay recorded is The group delay that signal is overall, the overall permanence of representation signal；Furthermore, tried to achieve signal lag by then passing through straight slope, and connect Receipts start-phase is unrelated, need not consider the impact that phase ambiguity is brought.

This relative time delay acquisition module is for deducting, with the plurality of time delay, the time delay that respective analog channel coupling network brings After, then using the time delay of the most a certain road analog channel as reference, the time delay of every other road analog channel respectively with as ginseng The relative time delay finally given between each passage is subtracted each other in the time delay of Kao Zhe road analog channel.Measured time delay be each passage it Between relative time delay rather than definitely time delay, represent interchannel delay difference, be also the portion needing in real work to compensate Point.

This Digital Array Radar multi-channel analog passage relative time delay measurement apparatus and array radar multi-channel analog passage are relative Time delay measurement method, its specific implementation process is as described below.

The first step, gathers the multi-channel analog passage through coupling network with same reception passage, same correction receiver Rf broadband linear FM signal, obtains base band I/Q signal after analog-and digital-mixing.

Second step, intercepts identical counting to multichannel base band I/Q signal from identical distance segment and obtains corresponding phase place song Line.

3rd step, the phase place of the phase curve of the actual signal recorded with second step and the linear FM signal of Standard ideal Curve subtracts each other the variation relation obtaining phase difference φ t in time, and fitting a straight line obtains slope k, according to computing formula, obtains many Road actual signal is relative to the time delay of ideal signal.

4th step, after the time delay that respective analog channel coupling network brings is deducted in the time delay obtained with the 3rd pacing, then with it In the analog channel time delay of a certain road as reference, the analog channel time delay of every other road is subtracted each other with it can finally give each passage Between relative time delay.

As a example by two paths of signals, measuring principle is as follows.

If a road signal is intermediate frequency f₀, bandwidth B, pulsewidth T₀, time delay t₀, initial phase deviation φ₀Linear FM signal, Its phase place expression formula is:

Another linear FM signal is no-delay and phase deviation, then have

Two paths of signals phase place is subtracted each other, and has

$\begin{array}{c}\mathrm{\Δ}\mathrm{\φ}(t,t_0,{\mathrm{\φ}}_0)\\ ={\mathrm{\φ}}_{ch1}(t,t_0,{\mathrm{\φ}}_0)-{\mathrm{\φ}}_{ch2}(t,0,0)\\ =2\mathrm{\π}(f_0-\frac{B}{2})(t-t_0)+\mathrm{\π}\frac{B}{T_0}{(t-t_0)}^2+{\mathrm{\φ}}_0-\left(2\mathrm{\π}\right(f_0-\frac{B}{2})t+\mathrm{\π}\frac{B}{T_0}{t}^2)\\ =-2\mathrm{\π}\frac{B}{T_0}{t}_{0}t+\mathrm{\π}\frac{B}{T_0}{t_0}^2-2\mathrm{\π}(f_0-\frac{B}{2})t_0+{\mathrm{\φ}}_0\end{array}.$

Two-way phase difference φ (t, t is understood by above formula₀,φ₀) linear with time t, it is carried out straight line y=kx+ B matching, can obtain slope k and intercept b, then have

So the relative time delay t of two-way linear FM signal can be released₀With relative initial phase φ₀It is respectively as follows:

$t_0=-\frac{T_{0}k}{2\mathrm{\π}B},{\mathrm{\φ}}_0=b-\mathrm{\π}\frac{B}{T_0}{t_0}^2+2\mathrm{\π}(f_0-\frac{B}{2})t_0=b-\frac{T_0{k}^2}{4\mathrm{\π}B}-(f_0-\frac{B}{2})\frac{T_{0}k}{B}.$

The present invention, by the fitting a straight line to two-way linear FM signal phase difference, is accurately obtained relative time delay.The method Higher certainty of measurement can be obtained under low signal-to-noise ratio, and be prone to Project Realization.

Bandwidth 100MHz, pulsewidth 10 μ s, signal to noise ratio 20, time delay waveform during time delay 5ns and ideal non-time delay waveform such as Fig. 1 Shown in, both phase curves subtract each other and obtain phase difference curve, and wherein black line is fitting a straight line.Add up 5000 times, by matching The time delay recorded is t₀=5.0001 ± 0.0123ns, statistic bias is 0.246% with the ratio of measured value, surveys under low signal-to-noise ratio Accuracy of measurement is higher.

In sum, compared with prior art, the invention have the benefit that

1, the time delay of gained is obtained by fitting a straight line, can improve certainty of measurement；

2, frequency content signals all in full bandwidth being carried out fitting a straight line, the time delay recorded is the group delay that signal is overall Time, the overall permanence of representation signal；

3, signal lag is tried to achieve by then passing through straight slope, unrelated with receiving start-phase, phase ambiguity need not be considered The impact brought；

4, measured time delay is the relative time delay between each passage rather than definitely time delay, represents interchannel time delay Difference, is also the part needing in real work to compensate；

5, use same reception passage, same correction receiver to gather signal, active correction can be removed and receive passage The measure error that otherness is brought, improves the stability of systematic survey；

6, the reception coupling network used is passive, can accurately measure each interchannel absolute time delay.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.

Claims (8)

1. a Digital Array Radar multi-channel analog passage relative time delay measurement apparatus, it is characterised in that: comprising:

Base band I/Q signal acquisition module: it is for gathering multiple wide-band LFMs of the multi-channel analog passage through coupling network Signal, and after analog-and digital-mixing, obtain multichannel base band I/Q signal；

Phase curve acquisition module, it obtains for this multichannel base band I/Q signal is intercepted identical counting from identical distance segment Multiple phase curves；

Delay acquisition module, its with the plurality of phase curve respectively with the phase curve of the wideband correlation of Standard ideal Subtract each other the variation relation obtaining multiple phase difference φ t in time, and fitting a straight line obtains multiple slope k, according to the plurality of phase The variation relation of potential difference Δ φ t in time and corresponding slope k respectively obtain the wideband correlation of multi-channel analog passage Multiple time delays relative to the wideband correlation of Standard ideal；

Relative time delay acquisition module, it is after deducting, with the plurality of time delay, the time delay that respective analog channel coupling network brings, Again using the time delay of the most a certain road analog channel as reference, the time delay of every other road analog channel respectively with as reference The relative time delay finally given between each passage is subtracted each other in the time delay of this road analog channel.

2. Digital Array Radar multi-channel analog passage relative time delay measurement apparatus as claimed in claim 1, it is characterised in that: should Phase curve acquisition module same reception passage, same correction receiver gather the multi-channel analog passage through coupling network Wideband correlation.

3. Digital Array Radar multi-channel analog passage relative time delay measurement apparatus as claimed in claim 1, it is characterised in that: should Coupling network is passive.

4. Digital Array Radar multi-channel analog passage relative time delay measurement apparatus as claimed in claim 1, it is characterised in that: should The way of analog channel is two-way:

One road signal is intermediate frequency f₀, bandwidth B, pulsewidth T₀, time delay t₀, initial phase deviation φ₀Linear FM signal, its phase meter Reaching formula is:

Another linear FM signal is no-delay and phase deviation, then have:Two Road signal phase subtracts each other, then have:

$\begin{array}{c}\mathrm{\Δ}\mathrm{\φ}(t,t_0,{\mathrm{\φ}}_0)\\ ={\mathrm{\φ}}_{ch1}(t,t_0,{\mathrm{\φ}}_0)-{\mathrm{\φ}}_{ch2}(t,0,0)\\ =2\mathrm{\π}(f_0-\frac{B}{2})(t-t_0)+\mathrm{\π}\frac{B}{T_0}{(t-t_0)}^2+{\mathrm{\φ}}_0-\left(2\mathrm{\π}\right(f_0-\frac{B}{2})t+\mathrm{\π}\frac{B}{T_0}{t}^2)\\ =-2\mathrm{\π}\frac{B}{T_0}{t}_{0}t+\mathrm{\π}\frac{B}{T_0}{t_0}^2-2\mathrm{\π}(f_0-\frac{B}{2})t_0+{\mathrm{\φ}}_0\end{array};$

Two-way phase difference φ (t, t₀,φ₀) linear with time t, it is carried out a beeline y=kx+b matching, obtains slope K and intercept b, then have

Obtain the relative time delay t of two-way linear FM signal₀With relative initial phase φ₀It is respectively as follows:

$t_0=-\frac{T_{0}k}{2\mathrm{\π}B},{\mathrm{\φ}}_0=b-\mathrm{\π}\frac{B}{T_0}{t_0}^2+2\mathrm{\π}(f_0-\frac{B}{2})t_0=b-\frac{T_0{k}^2}{4\mathrm{\π}B}-(f_0-\frac{B}{2})\frac{T_{0}k}{B}.$

5. a Digital Array Radar multi-channel analog passage relative time delay measuring method, it is characterised in that: it comprises the following steps:

Collection, through the wideband correlation of the multi-channel analog passage of coupling network, obtains many after analog-and digital-mixing Road base band I/Q signal；

This multichannel base band I/Q signal is intercepted identical counting from identical distance segment and obtains multiple phase curve；

Subtract each other with the phase curve of the wideband correlation of Standard ideal respectively with the plurality of phase curve and obtain multiple phase Potential differenceThe variation relation of t, and fitting a straight line in time obtains multiple slope k, according to the plurality of phase differenceT in time Variation relation and corresponding slope k respectively obtain the wideband correlation width relative to Standard ideal of multi-channel analog passage Multiple time delays with linear FM signal；

After deducting, with the plurality of time delay, the time delay that respective analog channel coupling network brings, then with the most a certain road analog channel Time delay is as reference, and the time delay of every other road analog channel time delay with this road analog channel as reference respectively is subtracted each other Obtain the relative time delay between each passage eventually.

6. Digital Array Radar multi-channel analog passage relative time delay measuring method as claimed in claim 5, it is characterised in that: use Same reception passage, same correction receiver gather the wideband correlation of the multi-channel analog passage through coupling network.

7. Digital Array Radar multi-channel analog passage relative time delay measuring method as claimed in claim 5, it is characterised in that: should Coupling network is passive.

8. Digital Array Radar multi-channel analog passage relative time delay measuring method as claimed in claim 5, it is characterised in that: should The way of analog channel is two-way:

One road signal is intermediate frequency f₀, bandwidth B, pulsewidth T₀, time delay t₀, initial phase deviation φ₀Linear FM signal, its phase meter Reaching formula is:

Another linear FM signal is no-delay and phase deviation, then have:Two Road signal phase subtracts each other, then have:

$\begin{array}{c}\mathrm{\Δ}\mathrm{\φ}(t,t_0,{\mathrm{\φ}}_0)\\ ={\mathrm{\φ}}_{ch1}(t,t_0,{\mathrm{\φ}}_0)-{\mathrm{\φ}}_{ch2}(t,0,0)\\ =2\mathrm{\π}(f_0-\frac{B}{2})(t-t_0)+\mathrm{\π}\frac{B}{T_0}{(t-t_0)}^2+{\mathrm{\φ}}_0-\left(2\mathrm{\π}\right(f_0-\frac{B}{2})t+\mathrm{\π}\frac{B}{T_0}{t}^2)\\ =-2\mathrm{\π}\frac{B}{T_0}{t}_{0}t+\mathrm{\π}\frac{B}{T_0}{t_0}^2-2\mathrm{\π}(f_0-\frac{B}{2})t_0+{\mathrm{\φ}}_0\end{array};$

Two-way phase difference φ (t, t₀,φ₀) linear with time t, it is carried out a beeline y=kx+b matching, obtains slope K and intercept b, then have

Obtain the relative time delay t of two-way linear FM signal₀With relative initial phaseIt is respectively as follows:

$t_0=-\frac{T_{0}k}{2\mathrm{\π}B},{\mathrm{\φ}}_0=b-\mathrm{\π}\frac{B}{T_0}{t_0}^2+2\mathrm{\π}(f_0-\frac{B}{2})t_0=b-\frac{T_0{k}^2}{4\mathrm{\π}B}-(f_0-\frac{B}{2})\frac{T_{0}k}{B}.$