CN1023515C - Self-correlation long-distance transmitting-receiving radar positioning method - Google Patents

Abstract

The self-correlation radar positioning method for transmitting and receiving in different places is a new double-multiple base radar positioning method. The positioning method only utilizes a completely uncontrolled and uncooled transmitting station as a target irradiation source and a time reference source, namely, a receiving station carries out relevant delay on a received time reference source signal according to a selected target in an irradiation space of the transmitting station to realize the ranging positioning of the target. Therefore, a plurality of receiving stations can freely select, track or shoot different targets in the same emitting station irradiation space, the data of the emitting station does not need to be transmitted, the work of the emitting station does not need to be fed back and regulated, and the display distortion of the targets does not exist.

Description

Autocorrelation receiving and transmitting radar locating method

Autocorrelation receiving and transmitting radar locating method is new two multistatic radar localization methods.This localization method has its remarkable advantages and characteristics solving aspect many technical barriers that two multistatic radars run into because of bistatic.The objective of the invention is for two multistatic radars provide a kind of new distance-measuring and positioning method, and can guarantee to realize that a plurality of receiving stations can freely select, follow the tracks of, shoot different targets in irradiation spatial domain, same cell site, and easy, flexibly and be easy to realize.

Many two multistatic radar location techniques although its method is different, mostly get on to seek to solve the target localization problem from bistatic or many bases " cooperation ".And for this " cooperation " need correspondingly solve a series of technical barriers.Adopt two multistatic radars of angle-measuring method such as: the radiation that utilizes noncooperative transmitter by receiving station, need the cooperation of plural receiving station usually and solve under data in real time transmission problem, spatial beams stationary problem and the multiple goal situation between receiving station because of cooperating bad " mirage " problem that may exist; Utilize distance and or range difference add two multistatic radars of angle-measuring method, need to solve time, spatial synchronization problem and the display distortion problem in receiving station of the strictness between transmitting-receiving station; Utilize receiving station regulation and control and synchronized transmissions station with the bistatic radar system of eliminating receiving station's display distortion in, this regulation and control with also limited synchronously this cell site and be availability that other receiving station utilized or the like.In a word, just because of the reason of these cooperations, restricted two multistatic radar application flexibilitys, being difficult for a plurality of receiving stations of realization can freely select, follow the tracks of or shoot different targets in irradiation spatial domain, same cell site.

The present invention-autocorrelation receiving and transmitting radar locating method is finished the range finding location voluntarily by receiving station under non-special matching requirements.It is compared with existing many two multistatic radar location techniques, and its characteristics are:

One, the cell site is provided with a T ₁Lag line 12.T ₁Lag line 12 makes the cell site to empty radiation pulses f.The time reference f of cell site broadcasting fixedly lags.Pulse T ₁Microsecond.Only this, the work of cell site with regard to receiving station to regard to the target localization being non-fiting property fully.

Its two, receiving station is provided with a relevant chronotron 21.The time reference f that relevant chronotron 21 transmits the cell site.Pulse triggers parallel synchronizer 22 and the range finding starting point pulse t of formation behind its correlation delay _oBe positioned at: if during as the transponder pulse of receiving station, the reflected signal that forms from the selected target of receiving station, just in time with shine the formed reflection echo signal t of this target by the cell site _mCoincide.

Its three, the time delay of relevant chronotron 21 is by correlation computer 25 result of calculation t ₂Value is adjusted.t ₂Determined by the geometric relationship between strange land transmitting-receiving radar and target.

Its four, above-mentioned range finding starting point pulse t _oWith target reflection echoed signal t _mPress 1/2 (t through range extraction device 24 _m-t _o) C directly enroll generate target apart from receiving station apart from r ₂

Its five, parallel synchronizer 22 makes each synchronizing pulse of receiving station with range finding starting point pulse t _oControlled together translation.Therefore, there is not display distortion in this target on receiving station's display 26, need not to show specially rectification.

Fig. 1 is the functional-block diagram of autocorrelation receiving and transmitting radar locating method.

Introduce enforcement principle of the present invention and method in detail below in conjunction with Fig. 1.

At first, cell site's time reference 10 produces a shared time reference f of this radar system _oPulse.f _oPulse is through broadcast transmitter 11 modulate emission, along down going channel D _oThe through broadcasting receiver 20 that enters receiving station; Another road f _oPulse is through T ₁After lag line 12 postpones, by irradiation transmitter 13 modulate emission, along data feedback channel R ₁, R ₂Enter the target receiver 23 of receiving station from target m reflection.

The f of broadcasting receiver 20 outputs _oPulse behind relevant chronotron 21 correlation delays, triggers parallel synchronizer 22 and produces a series of respective synchronization pulses of receiving station, also makes the range finding starting point pulse t of receiving station _oCorrectly be positioned at if during, just in time with the radiation pulses f of cell site as the transponder pulse of receiving station _aCoincide at this target place.Like this, this target reflection echoed signal t of target receiver 23 receptions _m, in range extraction device 24, press 1/2 (t _m-t _o) C form apart from r ₂Be exactly the distance of this target apart from receiving station.

So, how to calculate t time delay that determines relevant chronotron 21 ₂?

Space geometry from Fig. 1 concerns as can be known: for the f that guarantees down to work _oThe f of pulse and data feedback channel _oPulse arrives target m place simultaneously, then should guarantee away the f by broadcast transmitter 11 broadcasting of down going channel _oPulse, f in advance _oRadiation pulses t microsecond.

t＝ 1/(C) （D _L+r ₂-r ₁）……（1）

(1) D in the formula _LBe f _o(comprise circuit delay etc., the corresponding time is t to pulse edge down going channel transmission distance _a).Because the cell site has made f _oPulse advance f _aRadiation pulses T ₁Therefore microsecond, needs its time reference f that receives in receiving station _oPulse postpones t again ₂=T ₁-t microsecond.According to the observation ε of receiving station to target ₂(angular altitude), β ₂(position angle), then relevant chronotron t 21 time delay ₂Should be:

That is:

(2) in the formula

$\frac{1}{C}{\mathrm{(D}}_o\mathrm{-\; r}{}_2+\sqrt{D{}_o{}^2{\mathrm{+\; r}}_2{}^2{\mathrm{-\; 2D}}_{o}r{}_2\mathrm{COS\; \epsilon }{}_2\mathrm{COS\; (\; \beta }{}_o\mathrm{-\; \beta }{}_2)})$

Be called the related synchronization controlled quentity controlled variable, D _oBe the horizon grange between two stations, β _oBe the position angle, cell site; T ₁-(D _o+ D _L)/(C)=△ t is called fiducial error correction, T ₁Usually value is:

$T_1\ge \frac{D_{\mathrm{o\; m\; a\; x}}{\mathrm{+\; D}}_{\mathrm{l\; m\; a\; x}}}{C}$

, to satisfy the horizon grange D of receiving station farthest _OmaxWith transmission distance D _LmaxEach receiving station flies to be set by software by the school to the assignment of △ t, inserts from keyboard 27.Correlation computer 25 will be by formula (2) calculate to produce t ₂Relevant delay value, and adjust time delay of relevant chronotron 21 with the control of digital quantity form, make range finding starting point pulse t _oBe positioned at t _o=t _a+ t ₂On the position.Produce r by range extraction device 24 ₂=1/2 (t _m-t _o) C _oBecause t _m=T ₁+ t _R1+R2So:

(3) t in the formula _R1+R2By target reflection echoed signal t _mThe position determines that this localization method does not need specifically to obtain in theory.

When the relevant control system of receiving station is pressed Fig. 1 theory structure high-speed cruising again and again, i.e. when admission-calculating-output is adjusted, it finish just to t _R1+R2Interative computation for set-point.That is:

This iteration operating mechanism makes relevant chronotron constantly obtain adjusting 21 time delays, thereby makes the r of range extraction device 22 admissions ₂(4) convergence is by formula followed the tracks of at r ₂=R ₂Fasten the pass.Synthetic target viewing angle ε ₂, β ₂, also just finished independently the range finding of its selected target located by receiving station.

Consider that receiving station observation cell site also has an angular altitude H _oThe time, need the cosine angle COS ε in the above-mentioned formula ₂COS(β ₀-β ₂) change into:

COSH ₀·COSε ₂·COS（β ₀-β ₂）+SinH ₀·Sinε ₂

As:

Obviously, this localization method, receiving station has just utilized the cell site of the non-cooperation of complete non-control as target irradiation source and time reference source.In addition, selection, location and the tracking of target are all independently finished by receiving station, fully with self selected target for relevant.Need not to transmit the data of cell site, need not work, do not have the display distortion of this target again by receiving station feedback regulation cell site.This is especially suitable for the bistatic guidance radar that needs seeker, is convenient to realize a plurality of reception guidance radars in the spatial domain is shone in same cell site, freely selects, follows the tracks of the different target of shooting.No matter be exactly under narrow launching beam illuminate condition, be tracking target or to the sky search, this localization method can both guarantee by receiving station equally by its target or spatial point position m(R that determines ₂, ε ₂, β ₂), the remote control angle ε of decision cell site ₁, β ₁Realize the transmitting-receiving wave beam in the space precise synchronization, need not state exchange and special setting the " programming search " mode etc.

Claims (3)

1, a kind of auto-correlation strange land transmitting-receiving radar fix system, the cell site mainly includes time reference 10, broadcast transmitter 11, irradiation transmitter 13, receiving station mainly includes broadcasting receiver 20, target receiver 23, range extraction device 24, display 26 etc., it is characterized in that:

The cell site is added with a T ₁Lag line 12, T ₁Lag line 12 makes the cell site to empty radiation pulses f _aThe time reference f of cell site broadcasting fixedly lags _oPulse T ₁Microsecond; Receiving station is added with a relevant chronotron 21, parallel synchronizer 22, correlation computer 25, the time reference f that relevant chronotron 21 transmits the cell site _oPulse postpones t through it ₂Trigger parallel synchronizer 22 after the microsecond, parallel synchronizer 22 forms the range finding starting point pulse t of receiving station _oAnd each synchronizing pulse, and make each synchronizing pulse with this range finding starting point pulse t _oControlled together translation; Correlation computer 25 is by t time delay of the given relevant chronotron 21 of algorithm computation regulation and control ₂Value; Range extraction device 24 is with tm and t _oHalf is directly enrolled and generates the distance signal r of target apart from receiving station mistiming ₂, be transmitted back to correlation computer 25 again.

2, a kind of autocorrelation receiving and transmitting radar locating method is characterized in that:

1. the time reference f of cell site.Pulse, the one tunnel is not delayed by broadcast transmitter 11 modulate emission, and another road is through T ₁Lag line 12 postpones T ₁After the microsecond by irradiation transmitter 13 modulate emission, T ₁Value is: T ₁〉=(Domax+Dlmax)/C

2. the target receiver 23 of receiving station is with the angle on target signal epsilon of its observation ₂, β ₂Deliver to correlation computer 25 and range extraction device 24 respectively with target echo signal tm; Broadcasting receiver 20 is with its time reference f that receives.Pulse postpones t through relevant chronotron 21 ₂Trigger parallel synchronizer 22 after the microsecond, form the range finding starting point pulse t of receiving station.And with this range finding starting point pulse t.Each synchronizing pulse of controlled translation together; T time delay of relevant chronotron 21 ₂Pressing given algorithm by correlation computer 25 calculates definite; Range finding starting point pulse t.Press r with target echo signal tm by range extraction device 24 ₂=0.5(tm-to) C directly enrolls and generates and as the distance signal r of target apart from receiving station ₂, be transmitted back to correlation computer 25 again.

3, autocorrelation receiving and transmitting radar locating method according to claim 2 is characterized in that the related data of correlation computer 25 according to the selected target of this receiving station, presses given algorithm:

+ T ₁(D _o+ D _L)/(C) calculated t time delay that determines relevant chronotron 21 ₂Value.

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