CN104330778A - Multi-channel calibration method for active phased array radar - Google Patents

Abstract

The invention discloses a multi-channel calibration method for an active phased array radar. The multi-channel calibration method for the active phased array radar comprises configuring a plurality of receiving channels in an active phased array radar system, wherein every receiving channel comprises a plurality of frequency domain carrier wave subsets and calibrating the gain amplitude of a plurality of single receiving channels of the same carrier wave subset and the gain amplitude of different carrier wave subsets of the same receiving channel. The multi-channel calibration method for the active phased array radar effectively compensates inconformity of the amplitude and the characteristic of the receiving channels and obtains a better multi-channel calibration performance.

Description

Active Phased Array Radar is carried out to the method for multipath correction

Technical field

The present invention relates to radar and measurement and control area, be specifically related to a kind of method of Active Phased Array Radar being carried out to multipath correction.

Background technology

Active Phased Array Radar is at run duration, many reasons need to use self-tuing on line method: after long-play, due to the impact of device self deterioration and environment, multichannel initial parameter and state generation deviation when dispatching from the factory, if also continue to use the data of dispatching from the factory to be reference, the hydraulic performance decline of radar can be caused, need again to correct.In the micro-band communication of conventional radar, usually comprise closed loop gain and control (CLGC) function, during for ensureing system cloud gray model, Signal reception channel gain is stabilized in the precision of expectation; Because CLGC function only can keep the stable of integral passage gain, and not to compensation (or balanced) function of the inconsistent characteristic of channel amplitude, classic method has the occasion of inconsistent amplitude characteristic at receiving cable, can not amplitude response inconsistent between compensation channels inconsistent and hyperchannel effectively, correcting feature is undesirable.

Therefore, for the problems referred to above existing in correlation technique, at present effective solution is not yet proposed.

Summary of the invention

For solving the problem existing for above-mentioned prior art, the present invention proposes a kind of method of Active Phased Array Radar being carried out to multipath correction, the method comprises:

At Active Phased Array Radar system configuration many receiving cables, every bar receiving cable comprises multiple frequency domain carriers subset;

To the gain range of multiple Signal reception passages of same carrier wave subset, and the gain range of same receiving cable different carrier subset corrects.

Preferably, after Active Phased Array Radar system configuration many receiving cables, also comprise:

In every bar receiving cable, downlink information transmits in the frequency domain carriers subset be scheduled based on scheduling result;

The amplitude of frequency domain carriers subset digital signal based on predefined, with passage exterior antenna connector maximum transmit power corresponding maximal received power calibration, namely all carrier subset have the Signal reception channel gain amplitude of a constant and guarantee is scheduled, in carrier subset, the power summation of digital signal is no more than described maximal received power

Described frequency domain carriers subset signals is converted into time-domain baseband i/q signal through frequency-time-domain-transformation, after the process of Signal reception passage, is received by receiving antenna corresponding in external transmit by RF cable to aerial network.

Preferably, the gain range of the described gain range to same carrier wave subset multiple Signal reception passage and same receiving cable different carrier subset corrects, and comprises further:

To every bar receiving cable, on the basis that the inconsistent characteristic of acquisition receiving cable amplitude detects in real time, power statistic characteristic when radar system descending carrier subset Received signal strength based on priori is long, frequency domain carriers subset channel amplitude penalty coefficient or the time domain equalization filter factor of energy regularization in statistical significance when generation base band is long compensate;

By the gain range g of different carrier subset sums receiving cable _{n, k}carry out rectification building-out, be consistent with described channel gain amplitude g, namely for each k=1,2 ..., K, K are mapped to the carrier subset number on every bar receiving cable, make the gain range g of the carrier subset k of passage n _{n, k}=g, wherein n=1,2 ..., N, wherein, N is the receiving cable number in system.

Preferably, the real-time detection of the inconsistent characteristic of amplitude of described receiving cable is obtained by one of the following two kinds mode: send based on periodic broadband pilot signal, or based on measurement calibration data in advance.

Preferably, if produce base band long time statistical significance on the frequency domain carriers subset channel amplitude penalty coefficient of energy regularization compensate, then compensation process comprises further:

Uniform distribution received power between multiple receiving cables of same carrier wave subset, when representing Received signal strength on baseband receiving signals bandwidth intercarrier subset k long, power statistic is k=1,2 ..., K,

Every bar is needed to the receiving cable n corrected, amplitude compensating factor vector when the gain of K baseband frequency-domain carrier subset is long for:

$v_n^{\mathrm{Long}}={\mathrm{\α}}_n^{\mathrm{Long}}{[1/f_{n,1},1/f_{n,2},...,1/f_{n,K}]}^T$

Wherein, f _{n, k}(n=1,2 ..., N, k=1,2 ..., K) and represent the inconsistent amplitude response of passage that baseband receiving signals bandwidth internal channel n carrier subset k detects; Compensation term [1/f _{n, 1}, 1/f _{n, 2}..., 1/f _{n, K}] ^tinconsistent for what offset on different carrier subset channel gain; for energy regularization factors time long, in the power statistic meaning when carrier subset Received signal strength is long, make the baseband signal power P being input to signalling channel before and after compensating _inremain unchanged, make

$\underset{k=1}{\overset{K}{\mathrm{\Σ}}}{p}_k^{\mathrm{IN},\mathrm{Long}}={\left({\mathrm{\α}}_n^{\mathrm{Long}}\right)}^2\underset{k=1}{\overset{K}{\mathrm{\Σ}}}(p_k^{\mathrm{IN},\mathrm{Long}}/f_{n,k}^2)$

Namely

${\mathrm{\α}}_n^{\mathrm{Long}}=\sqrt{\frac{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}{p}_k^{\mathrm{IN},\mathrm{Long}}}{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}(p_k^{\mathrm{IN},\mathrm{Long}}/f_{n,k}^2)}}$

Described for at baseband frequency-domain to the k of passage n carrier subset passage g _{n, k}carry out amplitude correction compensation, Received signal strength after comprising the signalling channel process of the CLGC function that can maintain passage fixed gain amplitude g in real time, power P when multi-channel output signal is long in statistical significance _out=g ²p _inremain unchanged, thus all carrier subset channel gains are remained by statistical significance the gain range g of expectation when long.

Preferably, if produce base band time domain equalization filtering compensation coefficient to carry out channel correcting compensation, then energy regularization time domain equalization filter coefficient vector is utilized to replace frequency domain carriers subset gain range compensating factor vector corresponding energy regularization time domain equalization filter coefficient vector is wherein, F ^-1{ } is inversefouriertransform.

The present invention compared to existing technology, has the following advantages:

Effectively compensate the inconsistent phenomenon of receiving cable amplitude characteristic, obtain better multipath correction performance.

Accompanying drawing explanation

Fig. 1 is according to process flow diagram Active Phased Array Radar being carried out to multipath correction method of the embodiment of the present invention.

Embodiment

Detailed description to one or more embodiment of the present invention is hereafter provided together with the accompanying drawing of the diagram principle of the invention.Describe the present invention in conjunction with such embodiment, but the invention is not restricted to any embodiment.Scope of the present invention is only defined by the claims, and the present invention contain many substitute, amendment and equivalent.Set forth many details in the following description to provide thorough understanding of the present invention.These details are provided for exemplary purposes, and also can realize the present invention according to claims without some in these details or all details.

In order to solve the channel amplitude Correction Problems in wideband radar system in the inconsistent situation of receiving cable amplitude characteristic, the present invention proposes a kind of receiving cable amplitude correction method based on energy regularization equilibrium: time long based on carrier subset Received signal strength, the energy regularization of power statistic characteristic is balanced.

Fig. 1 is according to process flow diagram Active Phased Array Radar being carried out to multipath correction method of the embodiment of the present invention.An aspect of of the present present invention provides a kind of method of Active Phased Array Radar being carried out to multipath correction.First many receiving cables are configured in radar system.On every bar receiving cable, downlink information transmits in the frequency domain carriers subset be scheduled based on scheduling result; The amplitude of frequency domain carriers subset digital signal based on predefined, with passage exterior antenna connector maximum transmit power corresponding maximal received power calibration (namely supposes that all carrier subset have the Signal reception channel gain amplitude of a constant and be no more than by the scheduler power summation of digital signal in carrier subset that ensures to be scheduled frequency domain carriers subset signals is converted into time-domain baseband i/q signal through frequency-time-domain-transformation (i.e. IFFT conversion), after the process of Signal reception passage, is received by receiving antenna corresponding in external transmit by RF cable to aerial network.Digital intermediate frequency or zero intermediate frequency scheme is adopted to complete the rf modulations of baseband signal; Base band digital predistortion (DPD) technology based on power amplifier (PA) output signal feedback maintains channel linear; The real-time CLGC function maintenance channel gain exporting radio frequency signal feedback and channel gain off-line correction data (as the gain calibration data of feedback channel, the gain calibration data etc. of radio-frequency front-end receiving filter) based on PA or passage is stablized.The External connecting part (antenna channels containing in radio-frequency cable and aerial network) of receiving cable peripheral antenna connector can introduce certain decay usually to received signal.But this part has good band amplitude consistent degree usually, and different interchannel gain difference also the easy mode by off-line correction obtain and compensate.

In order to effectively excavate the performance gain of radar system wave beam forming and downlink, need to correct the gain range of same carrier wave subset multiple Signal reception passage and the gain range of same receiving cable different carrier subset, make the gain range g of different carrier subset sums receiving cable after rectification building-out _{n, k}be consistent, that is:

G _{n, k}=g, wherein n=1,2 ..., N; K=1,2 ..., K

And wherein, g _{n, k}for the gain range of passage n carrier subset k, N is the receiving cable number in system, and K is mapped to the carrier subset number on every bar receiving cable.

The basic process of multipath correction method is: to every bar receiving cable, on the basis that the inconsistent characteristic of acquisition channel amplitude detects in real time, power statistic characteristic when radar system descending carrier subset Received signal strength based on priori is long, when generation base band is long, in statistical significance, the frequency domain carriers subset channel amplitude penalty coefficient of energy regularization compensates, or generation time domain equalization filter factor compensates equivalently, thus correct.

Wherein in concrete engineering realizes, the real-time detection of the inconsistent characteristic of amplitude of receiving cable obtains by one of the following two kinds method usually: the method sent based on periodic broadband pilot signal and the method based on measurement calibration data in advance.

Power statistic characteristic and system network planning when Active Phased Array Radar system descending carrier subset Received signal strength is long, relevant by some metastable system performances such as head of a household's time-division cloth and resource dispatching strategy, can be obtained by the system performance measurement of theoretical simulation or reality, and be configured in system and use as prior imformation.

Consider in the Active Phased Array Radar system of reality; control to need easily for channel reception power; the multiple antennas treatment technology (MIMO, wave beam forming) applied usually can between multiple receiving cables of same carrier wave subset uniform distribution received power, when representing Received signal strength on baseband receiving signals bandwidth intercarrier subset k long, power statistic is k=1,2 ..., K.

In order to the target that the gain reaching all carrier subset and receiving cable in baseband receiving signals bandwidth is all the perfect Gain, every bar is needed to the receiving cable corrected, as passage n, when the gain of definition K baseband frequency-domain carrier subset is long, amplitude compensating factor vector is:

$v_n^{\mathrm{Long}}={\mathrm{\α}}_n^{\mathrm{Long}}{[1/f_{n,1},1/f_{n,2},...,1/f_{n,K}]}^T$

Wherein, f _{n, k}(n=1,2 ..., N, k=1,2 ..., K) and represent the inconsistent amplitude response of passage that baseband receiving signals bandwidth internal channel n carrier subset k detects; Compensation term [1/f _{n, 1}, 1/f _{n, 2}..., 1/f _{n, K}] ^tinconsistent for what offset on different carrier subset channel gain; for energy regularization factors time long, in the power statistic meaning when carrier subset Received signal strength is long, make the baseband signal power P being input to signalling channel before and after compensating _inremain unchanged, namely make

$\underset{k=1}{\overset{K}{\mathrm{\Σ}}}{p}_k^{\mathrm{IN},\mathrm{Long}}={\left({\mathrm{\α}}_n^{\mathrm{Long}}\right)}^2\underset{k=1}{\overset{K}{\mathrm{\Σ}}}(p_k^{\mathrm{IN},\mathrm{Long}}/f_{n,k}^2)$

Also be

${\mathrm{\α}}_n^{\mathrm{Long}}=\sqrt{\frac{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}{p}_k^{\mathrm{IN},\mathrm{Long}}}{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}(p_k^{\mathrm{IN},\mathrm{Long}}/f_{n,k}^2)}}$

for carrying out amplitude correction compensation at baseband frequency-domain to the k of passage n carrier subset passage.Due to compensation vector in p in statistical significance when existence makes long _inconstant, Received signal strength after comprising the signalling channel process of (can maintain passage fixed gain amplitude g's in real time) CLGC function, power P when multi-channel output signal is long in statistical significance _out=g ²p _inalso constant.Like this, after over-compensation, will statistical significance when long make all carrier subset channel gains consistent and gain range g for expecting.

With baseband frequency-domain carrier subset gain range compensating factor vector correspondence, as adopted the filtering of base band time domain equalization to carry out channel correcting compensation, corresponding energy regularization time domain equalization filter coefficient vector is wherein, F ^-1{ } is inversefouriertransform.

In sum, the present invention proposes a kind of multipath correction method, effectively compensate the inconsistent phenomenon of receiving cable amplitude characteristic, obtain better multipath correction performance.

Obviously, it should be appreciated by those skilled in the art, above-mentioned of the present invention each module or each step can realize with general computing system, they can concentrate on single computing system, or be distributed on network that multiple computing system forms, alternatively, they can realize with the executable program code of computing system, thus, they can be stored and be performed by computing system within the storage system.Like this, the present invention is not restricted to any specific hardware and software combination.

Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.

Claims (6)

1. Active Phased Array Radar is carried out to a method for multipath correction, it is characterized in that, the method comprises:

At Active Phased Array Radar system configuration many receiving cables, every bar receiving cable comprises multiple frequency domain carriers subset;

To the gain range of multiple Signal reception passages of same carrier wave subset, and the gain range of same receiving cable different carrier subset corrects.

2. method according to claim 1, after Active Phased Array Radar system configuration many receiving cables, also comprises:

In every bar receiving cable, downlink information transmits in the frequency domain carriers subset be scheduled based on scheduling result;

The amplitude of frequency domain carriers subset digital signal based on predefined, with passage exterior antenna connector maximum transmit power corresponding maximal received power calibration, namely all carrier subset have the Signal reception channel gain amplitude of a constant and guarantee is scheduled, in carrier subset, the power summation of digital signal is no more than described maximal received power

Described frequency domain carriers subset signals is converted into time-domain baseband i/q signal through frequency-time-domain-transformation, after the process of Signal reception passage, is received by receiving antenna corresponding in external transmit by RF cable to aerial network.

3. method according to claim 2, the gain range of the described gain range to same carrier wave subset multiple Signal reception passage and same receiving cable different carrier subset corrects, and comprises further:

To every bar receiving cable, on the basis that the inconsistent characteristic of acquisition receiving cable amplitude detects in real time, power statistic characteristic when radar system descending carrier subset Received signal strength based on priori is long, frequency domain carriers subset channel amplitude penalty coefficient or the time domain equalization filter factor of energy regularization in statistical significance when generation base band is long compensate;

By the gain range g of different carrier subset k and receiving cable n _{n, k}carry out rectification building-out, be consistent with described channel gain amplitude g, namely for each k=1,2 ..., K, K are mapped to the carrier subset number on every bar receiving cable, make the gain range g of the carrier subset k of passage n _{n, k}=g, wherein n=1,2 ..., N, wherein, N is the receiving cable number in system.

4. method according to claim 3, the real-time detection of the inconsistent characteristic of amplitude of described receiving cable is obtained by one of the following two kinds mode: send based on periodic broadband pilot signal, or based on measurement calibration data in advance.

5. method according to claim 4, if produce base band long time statistical significance on the frequency domain carriers subset channel amplitude penalty coefficient of energy regularization compensate, then compensation process comprises further:

Uniform distribution received power between multiple receiving cables of same carrier wave subset, when representing Received signal strength on baseband receiving signals bandwidth intercarrier subset k long, power statistic is k=1,2 ..., K,

Every bar is needed to the receiving cable n corrected, amplitude compensating factor vector when the gain of K baseband frequency-domain carrier subset is long for:

$v_n^{\mathrm{Long}}={\mathrm{\α}}_n^{\mathrm{Long}}{[1{/f}_{n,1},1/f_{n,2},...,1/f_{n,K}]}^T$

Wherein, f _{n, k}(n=1,2 ..., N, k=1,2 ..., K) and represent the inconsistent amplitude response of passage that baseband receiving signals bandwidth internal channel n carrier subset k detects; Compensation term [1/f _{n, 1}, 1/f _{n, 2}..., 1/f _{n, K}] ^tinconsistent for what offset on different carrier subset channel gain; for energy regularization factors time long, in the power statistic meaning when carrier subset Received signal strength is long, make the baseband signal power P being input to signalling channel before and after compensating _inremain unchanged, make

$\underset{k=1}{\overset{K}{\mathrm{\Σ}}}{p}_k^{\mathrm{IN},\mathrm{Long}}={\left({\mathrm{\α}}_n^{\mathrm{Long}}\right)}^2\underset{k=1}{\overset{K}{\mathrm{\Σ}}}(p_k^{\mathrm{IN},\mathrm{Long}}/f_{n,k}^2)$

Namely

${\mathrm{\α}}_n^{\mathrm{Long}}=\sqrt{\frac{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}{p}_k^{\mathrm{IN},\mathrm{Long}}}{\underset{k=1}{\overset{K}{\mathrm{\Σ}}}(p_k^{\mathrm{IN},\mathrm{Long}}/f_{n,k}^2)}}$

Described for at baseband frequency-domain to the k of passage n carrier subset passage g _{n, k}carry out amplitude correction compensation, Received signal strength after comprising the signalling channel process of the CLGC function that can maintain passage fixed gain amplitude g in real time, power P when multi-channel output signal is long in statistical significance _out=g ²p _inremain unchanged, thus all carrier subset channel gains are remained by statistical significance the gain range g of expectation when long.

6. method according to claim 5, also comprises, if produce base band time domain equalization filtering compensation coefficient to carry out channel correcting compensation, then utilizes energy regularization time domain equalization filter coefficient vector to replace frequency domain carriers subset gain range compensating factor vector corresponding energy regularization time domain equalization filter coefficient vector is wherein, F ^-1{ } is inversefouriertransform.