CN104506253A - Amplitude phase error correction system and method for transmitting channel of phased-array antenna - Google Patents
Amplitude phase error correction system and method for transmitting channel of phased-array antenna Download PDFInfo
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- CN104506253A CN104506253A CN201510016099.9A CN201510016099A CN104506253A CN 104506253 A CN104506253 A CN 104506253A CN 201510016099 A CN201510016099 A CN 201510016099A CN 104506253 A CN104506253 A CN 104506253A
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Abstract
The invention discloses an amplitude phase error correction system and an amplitude phase error correction method for a transmitting channel of a phased-array antenna. The amplitude phase error correction system comprises a correction signal source, a rotary selector switch, a to-be-corrected transmitting channel, an auxiliary receiving channel and a correction coefficient calculating module. When the amplitude phase error correction is carried out on an n transmitting channel, a correction signal source transmits a correction signal y (k), and the auxiliary receiving channel receives a signal yn (k) at the same time. A correction coefficient calculating module calculates a correction weight signal wn through the signal yn (k) and a reference signal yref (k) in such a way of adopting a minimum mean square self-adaptive filtering algorithm. According to the method and system provided by the invention, the methods engineering can be realized simply, and the correction accuracy is higher, therefore the system and the method can be applied to the field of the amplitude phase error correction of a uniform circular array phased-array antenna.
Description
Technical field
The present invention relates to phased array antenna and correct field, be specifically related to a kind of phased array antenna transmission channel amplitude and phase error correction system and method.
Background technology
Phased array antenna is the aerial array be made up of much same antenna array element and corresponding radio-frequency front-end, each passage contains some microwave devices, as Radiative antenna elements, phase shifter, electrically controlled attenuator, power amplifier, frequency converter, LNA, filter, amplitude limiter etc.Phased array antenna is in process of production due to the inconsistency of each device, and manufacture, the assembling of equipment exist tolerance, makes the amplitude of antenna each array element respective channel and phase place occur larger error, i.e. Ro-vibrational population.In addition, due to the change of environment for use, in Long-Time Service process, the replacing etc. of aging, the equipment of device, also can cause the amplitude of each array element passage of antenna and phase place to occur error.
Phased array antenna is that phase place by accurately controlling each array element, amplitude are to realize Beam synthesis and control, amplitude phase error between each passage will cause the index such as antenna side lobe, beam-pointing accuracy to decline, affect the performance of phased array antenna, even cisco unity malfunction time serious.Therefore, carrying out accurate correction to its each interchannel amplitude phase error during one's term of military service in phased array antenna is the key that phased array antenna normally works.
The basic skills that current phased array antenna corrects is in darkroom, is corrected by far-field measurement.This method, first needs phased array antenna to transfer to darkroom from mounting platform, then uses various instrument and equipment to measure in darkroom, complicated operation.
Summary of the invention
The present invention aims to provide and a kind ofly simply Project Realization can either can obtain again the uniform circular array phased array antenna transmission channel amplitude and phase error correction system and method for higher calibration precision, solves uniform circular array phased array antenna transmission channel amplitude and phase error correction problem.
The present invention can reach by the following technical programs, a kind of phased array antenna transmission channel amplitude and phase error correction system, comprises correction signal source, rotates diverter switch, transmission channel to be corrected, auxiliary reception passage, correction factor calculation module, it is characterized in that:
N number of transmitting array element of phased array antenna to be corrected is evenly arranged in one circumferentially, and auxiliary reception passage array element is positioned at the center of circle, wherein N be greater than 1 integer;
Correction signal source is connected with rotation diverter switch, be connected with correction factor calculation module simultaneously, the correction signal y (k) produced, while passing to rotation diverter switch, passes to correction factor calculation module, as the reference signal y of correction factor calculation module
ref(k), wherein k=0,1,2... represents sampling sequence number;
Rotate diverter switch to be connected with transmission channel to be corrected with correction signal source; Rotate diverter switch by N number of K switch
1..., K
nform, each moment is a closed switch only, and all the other N-1 switches disconnect; When n-th switch closes, rotate diverter switch and correction signal y (k) is passed to the n-th transmission channel to be corrected; Wherein, n=1 ..., N;
Transmission channel to be corrected comprises the transmission channel of N number of same structure, and each transmission channel is made up of D/A, radio-frequency front-end and array element; The correction signal y (k) that each transmission channel to be corrected receives is converted to analog signal through D/A, then is transmitted into free space through radio-frequency front-end and array element;
Auxiliary reception passage is made up of reference array element, radio-frequency front-end and A/D, be connected with correction factor calculation module, reference array element receives the correction signal of launching through the n-th transmission channel to be corrected from free space, by radio-frequency front-end, then be converted to discrete Received signal strength y through A/D
n(k), and pass to correction factor calculation module;
Correction factor calculation module, is connected with the A/D of correction signal source with auxiliary reception passage respectively, by the correction signal y (k) and the discrete Received signal strength y that launch
nk (), completes the calculating of correction coefficient.
A kind of phased array antenna transmission channel amplitude and phase error correction method, is characterized in that:
1. correction signal source continues to produce the frequency sinusoidal signal y (k) identical with phased array antenna signal carrier frequency;
2. get n=1, for the n-th transmission channel to be corrected, rotate diverter switch breaker in middle K
nclosed, rest switch disconnects, and correction signal y (k) is transmitted into free space through n-th to be corrected transmission channel; Correction factor calculation module receives reference signal y from correction signal source
refk ()=y (k), meanwhile, from the signal y that auxiliary reception channel reception is launched through n-th to be corrected transmission channel
n(k);
3. correction factor calculation module is according to signal y
ref(k) and y
nk (), adopts lowest mean square (Least MeanSquare, LMS) adaptive filter algorithm, calculates the correction coefficient w of the n-th transmission channel to be corrected
n;
4. get n=2 respectively, 3 ..., N, according to step 2.-method 3., calculate the correction coefficient w of each transmission channel to be corrected
n, thus complete phased array antenna transmission channel amplitude and phase error correction.
A kind of phased array antenna transmission channel amplitude and phase error correction method, is characterized in that, step is middle correction coefficient w 3.
nthe specific implementation step of computational methods is:
The first step, if k=0, and arranges initialization correction coefficient w
n(k)=1; Selected iteration step length μ, step size mu will meet the LMS adaptive filter algorithm condition of convergence;
Second step, calculates output error e
n(k)=y
ref(k)-w
n(k) y
n(k);
3rd step, calculates and upgrades correction coefficient
wherein, conjugation is got in symbol " * " expression;
4th step, judges whether correction coefficient restrains, if no convergence, then k=k+1, jumps to second step; If restrained, correction coefficient w now
nk () is as the correction coefficient w of the n-th transmission channel to be corrected
n, and stop iterative computation.
The invention provides a kind of uniform circular array phased array antenna transmission channel amplitude and phase error correction system and method, make phased array antenna transmission channel amplitude and phase error correction without the need to carrying out far-field measurement in darkroom, but just can realize on phased array antenna mounting platform, do not need to use various instrument and equipment, Project Realization is simple, can obtain better correction accuracy simultaneously.The present invention can be applied to the amplitude and phase error correction field of uniform circular array phased array antenna transmission channel.
Accompanying drawing explanation
Fig. 1 corrective system front array element distribution schematic diagram
Fig. 2 phased array antenna emitting structural block diagram
Fig. 3 uniform circular array phased array antenna transmitting channel correction block diagram of system
Fig. 4 LMS adaptive algorithm flow chart
Embodiment
A uniform circular array phased array antenna be made up of N number of array element and respective channel thereof, N number of transmitting array element is evenly arranged in one circumferentially, and center of circle array element is auxiliary reception passage array element, as shown in Figure 1.As shown in Figure 2, transmitter produces to transmit and be radiated free space by array element after D/A, radio-frequency front-end phased array antenna emitting structural block diagram.Be narrow band signal because phased array antenna transmits, in whole signal bandwidth, each interchannel amplitude gain and phase error can be similar to not with frequency shift.So timing does not need to consider respectively the signal of different frequency, is all similar to and thinks to occur in centre frequency, as long as so introduce a range error factors A at each interchannel
nwith the phase error factor
, wherein n=1 ..., N.Need to carry out test evaluation to the transmission coefficient of each transmission channel to be corrected in advance for correcting uniform circular array phased array antenna transmission channel amplitude phase error, and then ask for the correction coefficient of each transmission channel to be corrected
The invention provides a kind of phased array antenna transmission channel amplitude and phase error correction system and method, the accurate correction of transmission channel can be realized.Correct test for convenience, the heart arranges an auxiliary reception channel receiving signal in an array, and auxiliary reception passage array element is positioned at the center of circle.
The uniform circular array phased array antenna transmission channel amplitude and phase error correction block diagram of system as shown in Figure 3, comprises correction signal source, rotates diverter switch, transmission channel to be corrected, auxiliary reception passage and correction factor calculation module.
Correction signal source is connected with rotation diverter switch, be connected with correction factor calculation module simultaneously, the correction signal y (k) produced, while passing to rotation diverter switch, passes to correction factor calculation module, as the reference signal y of correction factor calculation module
ref(k), wherein k=0,1,2... represents sampling sequence number;
Rotate diverter switch to be connected with transmission channel to be corrected with correction signal source; Rotate diverter switch by N number of K switch
1..., K
nform, each moment is a closed switch only, and all the other N-1 switches disconnect; When n-th switch closes, rotate diverter switch and correction signal y (k) is passed to the n-th transmission channel to be corrected; Wherein, n=1 ..., N;
Transmission channel to be corrected comprises the transmission channel of N number of same structure, and each transmission channel is made up of D/A, radio-frequency front-end and array element; The correction signal y (k) that each transmission channel to be corrected receives is converted to analog signal through D/A, then is transmitted into free space through radio-frequency front-end and array element;
Auxiliary reception passage is made up of reference array element, radio-frequency front-end and A/D, be connected with correction factor calculation module, reference array element receives the correction signal of launching through the n-th transmission channel to be corrected from free space, by radio-frequency front-end, then be converted to discrete Received signal strength y through A/D
n(k), and pass to correction factor calculation module;
Correction factor calculation module, is connected with the A/D of correction signal source with auxiliary reception passage respectively, by the correction signal y (k) and the discrete Received signal strength y that launch
nk (), completes the calculating of correction coefficient.
Uniform circular array phased array antenna transmission channel amplitude and phase error correction method, its specific implementation step is:
1. correction signal source continues to produce the frequency sinusoidal signal y (k) identical with phased array antenna signal carrier frequency;
2. get n=1, for the n-th transmission channel to be corrected, rotate diverter switch breaker in middle K
nclosed, rest switch disconnects, and correction signal y (k) is transmitted into free space through n-th to be corrected transmission channel; Correction factor calculation module receives reference signal y from correction signal source
refk ()=y (k), meanwhile, from the signal y that auxiliary reception channel reception is launched through n-th to be corrected transmission channel
n(k);
3. correction factor calculation module is according to signal y
ref(k) and y
nk (), adopts lowest mean square (Least MeanSquare, LMS) adaptive filter algorithm, calculates the correction coefficient w of the n-th transmission channel to be corrected
n;
4. get n=2 respectively, 3 ..., N, according to step 2.-method 3., calculate the correction coefficient w of each transmission channel to be corrected
n, thus complete phased array antenna transmission channel amplitude and phase error correction.
Above-mentioned uniform circular array phased array antenna transmission channel amplitude and phase error correction method specific implementation step 3. in, correction coefficient w
nadopt LMS adaptive filter algorithm to calculate, as shown in Figure 4, its specific implementation step is algorithm flow chart:
The first step, if k=0, and arranges initialization correction coefficient w
n(k)=1; Selected iteration step length μ, step size mu will meet the LMS adaptive filter algorithm condition of convergence;
Second step, calculates output error e
n(k)=y
ref(k)-w
n(k) y
n(k);
3rd step, calculates and upgrades correction coefficient
wherein, conjugation is got in symbol " * " expression;
4th step, judges whether correction coefficient restrains, if no convergence, then k=k+1, jumps to second step; If restrained, correction coefficient w now
nk () is as the correction coefficient w of the n-th transmission channel to be corrected
n, and stop iterative computation.
The present invention, the unit needed for amplitude and phase error correction, combines together with phased array antenna design, so, carry out the mode corrected without the need to adopting far-field measurement in darkroom, phase array mounting platform just can complete measurement.So the invention enables the transmission channel amplitude and phase error correction of uniform circular array phased array antenna not only to have degree of precision, Project Realization also facilitates.
Claims (3)
1. a phased array antenna transmission channel amplitude and phase error correction system, comprises correction signal source, rotates diverter switch, transmission channel to be corrected, auxiliary reception passage, correction factor calculation module, it is characterized in that:
N number of transmitting array element of phased array antenna to be corrected is evenly arranged in one circumferentially, and auxiliary reception passage array element is positioned at the center of circle, wherein N be greater than 1 integer;
Correction signal source is connected with rotation diverter switch, be connected with correction factor calculation module simultaneously, the correction signal y (k) produced, while passing to rotation diverter switch, passes to correction factor calculation module, as the reference signal y of correction factor calculation module
ref(k), wherein k=0,1,2 ... represent sampling sequence number;
Rotate diverter switch to be connected with transmission channel to be corrected with correction signal source; Rotate diverter switch by N number of K switch
1..., K
nform, each moment is a closed switch only, and all the other N-1 switches disconnect; When n-th switch closes, rotate diverter switch and correction signal y (k) is passed to the n-th transmission channel to be corrected; Wherein, n=1 ..., N;
Transmission channel to be corrected comprises the transmission channel of N number of same structure, and each transmission channel is made up of D/A, radio-frequency front-end and array element; The correction signal y (k) that each transmission channel to be corrected receives is converted to analog signal through D/A, then is transmitted into free space through radio-frequency front-end and array element;
Auxiliary reception passage is made up of reference array element, radio-frequency front-end and A/D, be connected with correction factor calculation module, reference array element receives the correction signal of launching through the n-th transmission channel to be corrected from free space, by radio-frequency front-end, then be converted to discrete Received signal strength y through A/D
n(k), and pass to correction factor calculation module;
Correction factor calculation module, is connected with the A/D of correction signal source with auxiliary reception passage respectively, by the correction signal y (k) and the discrete Received signal strength y that launch
nk (), completes the calculating of correction coefficient.
2. a phased array antenna transmission channel amplitude and phase error correction method, is characterized in that:
1. correction signal source continues to produce the frequency sinusoidal signal y (k) identical with phased array antenna signal carrier frequency;
2. get n=1, for the n-th transmission channel to be corrected, rotate diverter switch breaker in middle K
nclosed, rest switch disconnects, and correction signal y (k) is transmitted into free space through n-th to be corrected transmission channel; Correction factor calculation module receives reference signal y from correction signal source
refk ()=y (k), meanwhile, from the signal y that auxiliary reception channel reception is launched through n-th to be corrected transmission channel
n(k);
3. correction factor calculation module is according to signal y
ref(k) and y
nk (), adopts lowest mean square (Least MeanSquare, LMS) adaptive filter algorithm, calculates the correction coefficient w of the n-th transmission channel to be corrected
n;
4. n=2 is got respectively, 3 ..., N, according to step 2.-method 3., calculate the correction coefficient w of each transmission channel to be corrected
n, thus complete phased array antenna transmission channel amplitude and phase error correction.
3. a kind of phased array antenna transmission channel amplitude and phase error correction method according to claim 2, is characterized in that, step is middle correction coefficient w 3.
nthe specific implementation step of computational methods is:
The first step, if k=0, and arranges initialization correction coefficient w
n(k)=1; Selected iteration step length μ, step size mu will meet the LMS adaptive filter algorithm condition of convergence;
Second step, calculates output error e
n(k)=y
ref(k)-w
n(k) y
n(k);
3rd step, calculates and upgrades correction coefficient
wherein, conjugation is got in symbol " * " expression;
4th step, judges whether correction coefficient restrains, if no convergence, then k=k+1, jumps to second step; If restrained, correction coefficient w now
nk () is as the correction coefficient w of the n-th transmission channel to be corrected
n, and stop iterative computation.
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| CN106357351A (en) * | 2015-07-17 | 2017-01-25 | 上海华虹集成电路有限责任公司 | Phased-array calibration system and method |
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