Email alert
2005 Vol. 27, No. 9
Display Method:
2005, 27(9): 1345-1348.
Abstract:
To analyze several key problems about effectiveness analysis of spaceborne parasitic SAR system，firstly,an index system ofefectiveness assessment is established based on the m ission request ofdistributed SAR system；combined with orbit characteristic...
To analyze several key problems about effectiveness analysis of spaceborne parasitic SAR system，firstly,an index system ofefectiveness assessment is established based on the m ission request ofdistributed SAR system；combined with orbit characteristic...
2005, 27(9): 1349-1352.
Abstract:
Phase Gradient Algorithm （PGA） is accomodated to focus the StripMap SAR data in this article. A new approach to StripMap SAR autofocus, StripMap PGA（SPGA）, is developed based on the difference between the received signal of StripMap SAR and SpotLight...
Phase Gradient Algorithm （PGA） is accomodated to focus the StripMap SAR data in this article. A new approach to StripMap SAR autofocus, StripMap PGA（SPGA）, is developed based on the difference between the received signal of StripMap SAR and SpotLight...
2005, 27(9): 1353-1356.
Abstract:
A robust correcting method for discrete spectrum in CW radar velocity measuring is proposed in this paper, t is named the method of triangle. This method, with low compution and high accuracy, is theoretically simple and easily carried out. The paper...
A robust correcting method for discrete spectrum in CW radar velocity measuring is proposed in this paper, t is named the method of triangle. This method, with low compution and high accuracy, is theoretically simple and easily carried out. The paper...
2005, 27(9): 1357-1360.
Abstract:
In some condition the present most of the methods are wake of ship or the natural interwave can be observed in remote sensing imagery. In used to detect linear features. This paper puts forward a method, which uses static boundary contour system base...
In some condition the present most of the methods are wake of ship or the natural interwave can be observed in remote sensing imagery. In used to detect linear features. This paper puts forward a method, which uses static boundary contour system base...
2005, 27(9): 1361-1364.
Abstract:
This paper is proposes to detecting radial moving ground targets from SAR image. Radical moving targets have focused image just as fixed ground clutters. The algorithm for detection and parameter estimation of radical targets has three steps. The fir...
This paper is proposes to detecting radial moving ground targets from SAR image. Radical moving targets have focused image just as fixed ground clutters. The algorithm for detection and parameter estimation of radical targets has three steps. The fir...
2005, 27(9): 1365-1369.
Abstract:
Traditional speckle removal methods generally result in the lost of image features. This paper presents a new approach to edge-preserving smoothing of digital SAR images based on the PDE's. A brief analysis of the principle of anisotropic nonlinear d...
Traditional speckle removal methods generally result in the lost of image features. This paper presents a new approach to edge-preserving smoothing of digital SAR images based on the PDE's. A brief analysis of the principle of anisotropic nonlinear d...
2005, 27(9): 1370-1374.
Abstract:
A practical modified autofocus algorithm for synthetic aperture radar, the iterative shift-and-correlation algorithm, is presented, Comparing with the original shift-and-correlation algorithm, the modified one can obtain more accurate estimations in ...
A practical modified autofocus algorithm for synthetic aperture radar, the iterative shift-and-correlation algorithm, is presented, Comparing with the original shift-and-correlation algorithm, the modified one can obtain more accurate estimations in ...
2005, 27(9): 1375-1378.
Abstract:
This paper detailedly analyzes precise Range Cell Migration（RCM） correction of the targets and motion error compensation of platforrn in high resolution airborne SAR data processing. The motion error of platforrn is divided into space-invariant compo...
This paper detailedly analyzes precise Range Cell Migration（RCM） correction of the targets and motion error compensation of platforrn in high resolution airborne SAR data processing. The motion error of platforrn is divided into space-invariant compo...
2005, 27(9): 1379-1382.
Abstract:
The key problem of calibration for low frequency ultra wide band synthetic aperture radar system is the acquisition of the scattering information of calibrators and suitable signal processing model. In this paper, the RCS of trihedral triangle reflec...
The key problem of calibration for low frequency ultra wide band synthetic aperture radar system is the acquisition of the scattering information of calibrators and suitable signal processing model. In this paper, the RCS of trihedral triangle reflec...
2005, 27(9): 1383-1387.
Abstract:
Range multi-aperture imaging algorithm is proved by theory that it can widen the swath and obtain high resolution at the same time. To evaluate the practicality of range multi-aperture SAR system, this paper gives quantitative errors analysis of this...
Range multi-aperture imaging algorithm is proved by theory that it can widen the swath and obtain high resolution at the same time. To evaluate the practicality of range multi-aperture SAR system, this paper gives quantitative errors analysis of this...
2005, 27(9): 1388-1392.
Abstract:
People can use measuring information provided by guider to establish optimal burst control algorithm in order to realize optimal burst. It is an important direction of burst control technology of missile. The optimal burst algorithm includes the esti...
People can use measuring information provided by guider to establish optimal burst control algorithm in order to realize optimal burst. It is an important direction of burst control technology of missile. The optimal burst algorithm includes the esti...
2005, 27(9): 1393-1397.
Abstract:
The performance of Cyclic Adaptive Beamforming （CAB） algorithm degrades severely when the estimation of the cycle frequency is not accurate. A robust CAB algorithm is proposed in this paper which overcomes the sensitivity to the Cycle Frequency Error...
The performance of Cyclic Adaptive Beamforming （CAB） algorithm degrades severely when the estimation of the cycle frequency is not accurate. A robust CAB algorithm is proposed in this paper which overcomes the sensitivity to the Cycle Frequency Error...
2005, 27(9): 1398-1403.
Abstract:
The Chirplet Transform（CT） have being become one of the most popular field in signal processing, which is extend from the Wavelet Transform（WT）. This paper calculate the Gaussian Chirplet Transform（GCT） by the Short-Time Fourier Transform（STFT）. At t...
The Chirplet Transform（CT） have being become one of the most popular field in signal processing, which is extend from the Wavelet Transform（WT）. This paper calculate the Gaussian Chirplet Transform（GCT） by the Short-Time Fourier Transform（STFT）. At t...
2005, 27(9): 1404-1407.
Abstract:
This paper proposes a new estimator for estimating the parameters of K-distribution which combines U estimator with X estimator efficiently. Simulations show that this new estimator yields shape parameter estimates with lower variance when compared w...
This paper proposes a new estimator for estimating the parameters of K-distribution which combines U estimator with X estimator efficiently. Simulations show that this new estimator yields shape parameter estimates with lower variance when compared w...
2005, 27(9): 1408-1411.
Abstract:
Coherence diffusion is an important preprocessing step for analyzing oriented structures in the image. Previous coherence diffusion methods for image enhancement could not recognize weak boundaries. In this paper, an efficient diffusion approach is p...
Coherence diffusion is an important preprocessing step for analyzing oriented structures in the image. Previous coherence diffusion methods for image enhancement could not recognize weak boundaries. In this paper, an efficient diffusion approach is p...
2005, 27(9): 1412-1415.
Abstract:
In this paper, a mistake made the multi-rate kinematic model is improv by Hong （2001） is pointed ed. And then, a multi-scan out and corrected, and the estimation performance of probabilistic data association algorithm is presented With the introducti...
In this paper, a mistake made the multi-rate kinematic model is improv by Hong （2001） is pointed ed. And then, a multi-scan out and corrected, and the estimation performance of probabilistic data association algorithm is presented With the introducti...
2005, 27(9): 1416-1419.
Abstract:
Using the Kalman filtering method, based on white noise estimation theory, under the linear minimum variance information fusion criterion, two-sensor information fusion steady-state optimal Wiener filter, smoother and predictor are presented for the ...
Using the Kalman filtering method, based on white noise estimation theory, under the linear minimum variance information fusion criterion, two-sensor information fusion steady-state optimal Wiener filter, smoother and predictor are presented for the ...
2005, 27(9): 1420-1424.
Abstract:
Automatic segmentation of brain magnetic resonance images is a critical problem in many medical imaging applications. In this paper, a robust automated segmentation algorithm is presented for the brain magnetic resonance images. The segmentation fram...
Automatic segmentation of brain magnetic resonance images is a critical problem in many medical imaging applications. In this paper, a robust automated segmentation algorithm is presented for the brain magnetic resonance images. The segmentation fram...
2005, 27(9): 1425-1428.
Abstract:
By exploring the phase information among symbols of the Direct Sequence Spread Spectrum （DS-SS） signal, a novel de-noising approach, used in low signal noise ratio environment, is presented. By coherent integration, this method can fully retain the s...
By exploring the phase information among symbols of the Direct Sequence Spread Spectrum （DS-SS） signal, a novel de-noising approach, used in low signal noise ratio environment, is presented. By coherent integration, this method can fully retain the s...
2005, 27(9): 1429-1432.
Abstract:
Chaos Neural Network（CNN）is applied to solve channel assignment problem in this paper. Energy function expression of channel assignment as well as mathematic model of CNN are put forward. Lyapunov exponent is calculated to judge whether there is chao...
Chaos Neural Network（CNN）is applied to solve channel assignment problem in this paper. Energy function expression of channel assignment as well as mathematic model of CNN are put forward. Lyapunov exponent is calculated to judge whether there is chao...
2005, 27(9): 1433-1436.
Abstract:
Orientation of the receive and transmit antenna arrays is always omitted while researching the performance of wireless channels. This paper investigates the impact on spatial correlation and capacity of MIMO （Multiple-lnput Multiple-Output） wireless ...
Orientation of the receive and transmit antenna arrays is always omitted while researching the performance of wireless channels. This paper investigates the impact on spatial correlation and capacity of MIMO （Multiple-lnput Multiple-Output） wireless ...
2005, 27(9): 1437-1440.
Abstract:
In this paper, an iterative joint channel-estimation and symbol-detection algorithm based on prediction is presented for orthogonal frequency-division multiplexing systems. Considering the correlation between impulse responses, the prediction method ...
In this paper, an iterative joint channel-estimation and symbol-detection algorithm based on prediction is presented for orthogonal frequency-division multiplexing systems. Considering the correlation between impulse responses, the prediction method ...
2005, 27(9): 1441-1445.
Abstract:
In this paper, the closed loop transmit diversity technique is investigated. The RAKE receiver model and the weighting vector algorithm are presented. Since the feedback delay in the practical systems has considerable effect on the receiver performan...
In this paper, the closed loop transmit diversity technique is investigated. The RAKE receiver model and the weighting vector algorithm are presented. Since the feedback delay in the practical systems has considerable effect on the receiver performan...
2005, 27(9): 1446-1449.
Abstract:
A subspace-based channel estimation method for Single-Carrier Block Transmission （SCBT） systems is presented, which estimates frequency-selective channel blindly in frequency domain, based on zero-padding technology in SCBT system. Sufficient conditi...
A subspace-based channel estimation method for Single-Carrier Block Transmission （SCBT） systems is presented, which estimates frequency-selective channel blindly in frequency domain, based on zero-padding technology in SCBT system. Sufficient conditi...
2005, 27(9): 1450-1453.
Abstract:
In this paper, an improved method of constructing multiple quasi-orthogonal spreading codes and a new modulation and demodulation scheme based on position mapping are proposed on the research of methods of constructing multiple quasi-orthogonal codes...
In this paper, an improved method of constructing multiple quasi-orthogonal spreading codes and a new modulation and demodulation scheme based on position mapping are proposed on the research of methods of constructing multiple quasi-orthogonal codes...
2005, 27(9): 1454-1458.
Abstract:
In mobile OFDM system, this paper pays much attention to the character of time domain result of LS channel estimation. At the same time, it is noticed that the character of Channel Impulse Response （CIR） is finite impulse response. A new algorithm is...
In mobile OFDM system, this paper pays much attention to the character of time domain result of LS channel estimation. At the same time, it is noticed that the character of Channel Impulse Response （CIR） is finite impulse response. A new algorithm is...
2005, 27(9): 1459-1462.
Abstract:
Focused on the scenario that none of the current standards achieves user identity＇s confidentiality, two enhanced methods are proposed, respectively based on public key cryptography and symmetric key cryptography, in which each user＇s real identity i...
Focused on the scenario that none of the current standards achieves user identity＇s confidentiality, two enhanced methods are proposed, respectively based on public key cryptography and symmetric key cryptography, in which each user＇s real identity i...
2005, 27(9): 1463-1466.
Abstract:
Identifiability is one of several security requirements of general proxy signature schemes, i.e. a verifier can determine the identity of the corresponding proxy signer from a proxy signature. In special application, the original signer wants to conc...
Identifiability is one of several security requirements of general proxy signature schemes, i.e. a verifier can determine the identity of the corresponding proxy signer from a proxy signature. In special application, the original signer wants to conc...
2005, 27(9): 1467-1469.
Abstract:
In order to investigate the cryptographical properties of the Multi-outputting Boolean functions under non-uniformity of arguments, this paper defines the spectrum and eigenvalue, presents the general expression and estimation formula, and computes t...
In order to investigate the cryptographical properties of the Multi-outputting Boolean functions under non-uniformity of arguments, this paper defines the spectrum and eigenvalue, presents the general expression and estimation formula, and computes t...
2005, 27(9): 1470-1475.
Abstract:
The bluetooth combiner, a combiner with four bit memory, is the stream cipher used in bluetooth protocols. The expression and computation of correlation coefficients between inputs and outputs of this combiner is difficult, while this is the base of ...
The bluetooth combiner, a combiner with four bit memory, is the stream cipher used in bluetooth protocols. The expression and computation of correlation coefficients between inputs and outputs of this combiner is difficult, while this is the base of ...
2005, 27(9): 1476-1478.
Abstract:
A secure and efficient （t, n） multisecret sharing authenticating scheme based on double shadow is proposed. The main merits are that the participant can reuse his shadows to recover the sharing multiple secrets that the dealer given and it only needs...
A secure and efficient （t, n） multisecret sharing authenticating scheme based on double shadow is proposed. The main merits are that the participant can reuse his shadows to recover the sharing multiple secrets that the dealer given and it only needs...
2005, 27(9): 1479-1482.
Abstract:
The maximization of data rate under the constraint of total transmit power and bit error rate is a considerable issue in OFDM system. Recognizing that the number of bits on each subcarrier must be a discrete number for real systems, this paper propos...
The maximization of data rate under the constraint of total transmit power and bit error rate is a considerable issue in OFDM system. Recognizing that the number of bits on each subcarrier must be a discrete number for real systems, this paper propos...
2005, 27(9): 1483-1487.
Abstract:
Because the fiber links share the common physical resources, they have the Correlated Link Failure Probability （CLFP）. Based on CLFP and Differentiated Reliability （DiR）, the dual-link failures problem has been studied, and a novel protection algorit...
Because the fiber links share the common physical resources, they have the Correlated Link Failure Probability （CLFP）. Based on CLFP and Differentiated Reliability （DiR）, the dual-link failures problem has been studied, and a novel protection algorit...
2005, 27(9): 1488-1492.
Abstract:
The problem that how to set the price to maximize revenue in WCDMA networks is investigated in this paper. Instead of adopting congestion pricing mechanism, this paper imposes fixed usage price on throughput of each user, which is assumed to be the f...
The problem that how to set the price to maximize revenue in WCDMA networks is investigated in this paper. Instead of adopting congestion pricing mechanism, this paper imposes fixed usage price on throughput of each user, which is assumed to be the f...
2005, 27(9): 1493-1497.
Abstract:
In multi-cell Wireless Local Area Networks （WLAN）, co-channel interference between access points, and interference between co-channel users located in neighbored cells are existed, which lead the system performance different from the situation in a s...
In multi-cell Wireless Local Area Networks （WLAN）, co-channel interference between access points, and interference between co-channel users located in neighbored cells are existed, which lead the system performance different from the situation in a s...
2005, 27(9): 1498-1502.
Abstract:
This paper studies on handoff management in hierarchically multi-hop wireless networks and proposes a novel user handoff algorithm and mobile base station route handoff strategy. The user handoff algorithm can reduce the number of handoff and balance...
This paper studies on handoff management in hierarchically multi-hop wireless networks and proposes a novel user handoff algorithm and mobile base station route handoff strategy. The user handoff algorithm can reduce the number of handoff and balance...
2005, 27(9): 1503-1506.
Abstract:
Trajectory estimation using the measurement of arrival angles from space-based infrared sensors is one of the key technologies in the space early warning system. This paper presents a pseudolinear measure-Kalman estimator for trajectory estimation in...
Trajectory estimation using the measurement of arrival angles from space-based infrared sensors is one of the key technologies in the space early warning system. This paper presents a pseudolinear measure-Kalman estimator for trajectory estimation in...
2005, 27(9): 1507-1509.
Abstract:
The paper presents a hybrid method based on FDTD and ADI-FDTD, introduces a method of weighted average to reduce the reflection caused by two different methods on the boundary, and presents a celerity method for the linear, lossless and isotropic med...
The paper presents a hybrid method based on FDTD and ADI-FDTD, introduces a method of weighted average to reduce the reflection caused by two different methods on the boundary, and presents a celerity method for the linear, lossless and isotropic med...
2005, 27(9): 1510-1512.
Abstract:
In this paper, a unified formulation to determine the terminal currents of an arbitrarily bended cable excited by a plane wave at any polarization angle is presented. Both the influence of the earth and the curve of cable on the terminal currents are...
In this paper, a unified formulation to determine the terminal currents of an arbitrarily bended cable excited by a plane wave at any polarization angle is presented. Both the influence of the earth and the curve of cable on the terminal currents are...
