By Topic

# IEEE Transactions on Aerospace and Electronic Systems

## Filter Results

Displaying Results 1 - 22 of 22
• ### Decentralized CFAR signal detection

Publication Year: 1989, Page(s):141 - 149
Cited by:  Papers (84)
| | PDF (627 KB)

The authors develop the theory of CA-CFAR (cell-averaging constant false-alarm rate) detection using multiple sensors and data fusion, where detection decisions are transmitted from each CA-CFAR detector to the data fusion center. The overall decision is obtained at the data fusion center based on some k out of n fusion rule. For a Swerling target model I embedded in white Gaussian noise of unknow... View full abstract»

• ### Studies of target detection algorithms that use polarimetric radar data

Publication Year: 1989, Page(s):150 - 165
Cited by:  Papers (111)  |  Patents (1)
| | PDF (1347 KB)

Algorithms are described which make use of polarimetric radar information in the detection and discrimination of targets in a ground clutter background. The optimal polarimetric detector (OPD) is derived. This algorithm processes the complete polarization scattering matrix (PSM) and provides the best possible detection performance from polarimetric radar data. Also derived is the best linear polar... View full abstract»

• ### Multisensor tracking of a maneuvering target in clutter

Publication Year: 1989, Page(s):176 - 189
Cited by:  Papers (111)  |  Patents (4)
| | PDF (824 KB)

An algorithm is presented for tracking a highly maneuvering target using two different sensors, a radar and an infrared sensor, assumed to operate in a cluttered environment. The nonparametric probabilist data association filter (PDAF) has been adapted for the multisensor (MS) case, yielding the MSPDAF. To accommodate the fact that the target can be highly maneuvering, the interacting multiple mod... View full abstract»

• ### Generalized guidance law for homing missiles

Publication Year: 1989, Page(s):197 - 212
Cited by:  Papers (70)  |  Patents (1)
| | PDF (1075 KB)

The concept of a generalized guidance law is presented, and the closed-form solution for a homing missile pursuing a maneuvering target according to generalized guidance laws is given. It is shown that the guidance laws appearing in the literature are merely special cases of the one proposed by the authors. The derived generalized forms of capture area, missile acceleration, and homing time durati... View full abstract»

• ### Time delay techniques for satellite interference location system

Publication Year: 1989, Page(s):224 - 231
Cited by:  Papers (19)  |  Patents (1)
| | PDF (791 KB)

Describes the development of a system for inferring the position of uplink ground stations, using existing domestic satellites, with minimal disruption of normal operation. The system uses the differential time delay of a single uplink signal passing through two adjacent spacecraft to infer the relative position of the uplink transmitter. A system for the measurement of such differential time dela... View full abstract»

• ### State-plane analysis of zero-voltage-switching resonant DC/DC converters

Publication Year: 1989, Page(s):232 - 240
Cited by:  Papers (3)
| | PDF (697 KB)

The state-plane analysis technique is established for the zero-voltage-switching resonant DC/DC power converter family of topologies, namely the buck, boost, buck-boost, Cuk, sepic, and dual-sepic converters. The state plane provides a compression of information, which allows the designer to examine the nonlinear dynamics of resonant converter operation. Utilizing the state plane, modes of resonan... View full abstract»

• ### Geometric accuracy in airborne SAR images

Publication Year: 1989, Page(s):241 - 258
Cited by:  Papers (49)
| | PDF (1443 KB)

Uncorrected across-track motions of a synthetic aperture radar (SAR) platform can cause both a severe loss of azimuthal positioning accuracy in, and defocusing of, the resultant SAR image. It is shown how the results of an autofocus procedure can be incorporated in the azimuth processing to produce a fully focused image that is geometrically accurate in azimuth. Range positioning accuracy is also ... View full abstract»

• ### Efficient scheduling algorithm for demand-assigned TDMA satellite systems

Publication Year: 1989, Page(s):259 - 267
| | PDF (663 KB)

An efficient scheduling algorithm (stations burst plan) for demand-assigned time-division multiple-access (TDMA) satellite network systems is introduced. The total demand for transmitting data through a transponder may exceed the available bit-rate capacity, and a scheduler of the system wishes to utilize the system with minimum changes of slot allocations while maximizing throughputs. By implemen... View full abstract»

• ### Chopper-controlled wind-driven self-excited induction generators

Publication Year: 1989, Page(s):268 - 276
Cited by:  Papers (6)
| | PDF (534 KB)

Two chopper circuit configurations, one with voltage commutation, are shown to be useful for obtaining a controllable DC voltage from wind-driven self-excited pole-changing induction generators. For the case of a resistive load, expressions for the average load voltage and power are derived, and a set of normalized curves relating the voltage ratio and time ratio is drawn. Experimental results on ... View full abstract»

• ### Comments on "Tracking a maneuvering target using input estimation

Publication Year: 1989
Cited by:  Papers (14)
| | PDF (81 KB)

P.L. Boglar (see ibid., vol.AES-23, no.3, p.298-310, May 1987) developed a recursive formulation of the Chan, Hu, and Plant (CHP) algorithm, and the results of the simulation verified the performance improvements. The commenter claims that Bogler obtained an incorrect recursive formulation of input estimation because he incorrectly used the formulation of the Kalman filter. The commenter presents ... View full abstract»

• ### Comments on "Tracking a maneuvering target using input estimation

Publication Year: 1989, Page(s):300 - 302
Cited by:  Papers (9)
| | PDF (223 KB)

A best linear unbiased estimate (BLUE) of the input process which characterizes a pilot-induced maneuver is developed for the case of the one-dimensional Kalman filter. This approach is utilized to yield a recursive implementation of the adaptive Kalman filter that is identical to that obtained by P.L. Bogler in the above mentioned paper (see ibid., vol.AES-23, no.3, p.298-310, May 1987).<> View full abstract»

• ### On combining target-location ellipses

Publication Year: 1989, Page(s):284 - 287
Cited by:  Papers (4)  |  Patents (1)
| | PDF (300 KB)

On the assumption of Gaussian statistics, expressions are obtained for the center, semiaxes, and the inclination of the major axis of a single location ellipse that combines the information in several location ellipses and/or bearings obtained from independent fixes on the same target. When all of the given ellipses have finite major axes and they are all shifted so as to have the same center, the... View full abstract»

• ### Digital beamforming calibration for FMCW radar

Publication Year: 1989, Page(s):281 - 284
Cited by:  Papers (7)
| | PDF (236 KB)

Three sources of beamforming deterioration are identified for an FMCW radar. These all relate to time-of-arrival and cable delays. There are small range-dependent phase errors at the receiver outputs. The delays cause frequency shifts, which produce phase errors at the discrete Fourier transform (DFT) outputs after ranging. These frequency shifts cause amplitude errors when the signals are resolve... View full abstract»

• ### Tracking a maneuvering target using input estimation versus the interacting multiple model algorithm

Publication Year: 1989, Page(s):296 - 300
Cited by:  Papers (173)  |  Patents (1)
| | PDF (300 KB)

Two maneuvering-target tracking techniques are compared. The first, called input estimation, models the maneuver as constant unknown input, estimates its magnitude and onset time, and then corrects the state estimate accordingly. The second models the maneuver as a switching of the target state model, where the various state models can be of different dimension and driven by process noises of diff... View full abstract»

• ### Autonomous fault-tolerant attitude reference system using DTGs in symmetrically skewed configuration

Publication Year: 1989, Page(s):302 - 307
Cited by:  Papers (4)
| | PDF (408 KB)

A novel symmetrically skewed configuration for an attitude reference system (ARS) using three dynamically tuned gyros (DTGs) is developed. Simple schemes for autonomous detection and identification of a faulty DTG in real time and subsequent reconfiguration of the attitude estimation algorithm are proposed. The performance of the present configuration is shown to be better than that of configurati... View full abstract»

• ### Efficient dynamic programming in presence of nuisance parameters

Publication Year: 1989, Page(s):277 - 280
Cited by:  Papers (2)
| | PDF (244 KB)

The dynamic programming approach for maximum a posteriori (MAP) estimation of Markov sequences is frequently proposed for problems in control theory, communications, and signal processing. It is usually assumed that the observation sequence is a perfectly known function of the Markov sequence of interest, except for some additive noise with known statistics. However, often the observation is not o... View full abstract»

• ### Finding the best set of K paths through a trellis with application to multitarget tracking

Publication Year: 1989, Page(s):287 - 296
Cited by:  Papers (53)  |  Patents (6)
| | PDF (628 KB)

A solution is presented to the problem of finding the best set of K completely unmerged paths through a trellis with M i⩾K states at depth i in the trellis, i=0, 1, 2, . . ., N. Here, best set' means that the sum of the metrics of all K paths in the set is minimized, and completely unmerged' means that no two paths pas... View full abstract»

• ### Performance of an adaptive detection algorithm; rejection of unwanted signals

Publication Year: 1989, Page(s):122 - 133
Cited by:  Papers (61)
| | PDF (860 KB)

The analysis of an adaptive detection algorithm described previously by the author (1985, 1986) is extended. Previously, the performance was evaluated for the case of a signal corresponding exactly to the steering vector used in the derivation of the algorithm. Here the performance for signals arriving from other directions is evaluated. It is shown that these signals are rejected much more strong... View full abstract»

• ### Performance of max-mean level detector with and without censoring

Publication Year: 1989, Page(s):213 - 223
Cited by:  Papers (15)  |  Patents (1)
| | PDF (740 KB)

The maximum-mean-level detector (MX-MLD) is a constant false-alarm rate (CFAR) detector designed to eliminate the excessively high false-alarm rate seen with the MLD at the edges of contiguous clutter regions. The concomitant high target suppression effect led M. Weiss (1982) to suggest a censored modification. The authors analyze the detection performance of the maximum-censored-mean-level detect... View full abstract»

• ### Estimating the Doppler centroid of SAR data

Publication Year: 1989, Page(s):134 - 140
Cited by:  Papers (171)  |  Patents (1)
| | PDF (524 KB)

After reviewing frequency-domain techniques for estimating the Doppler centroid of synthetic-aperture radar (SAR) data, the author describes a time-domain method and highlights its advantages. In particular, a nonlinear time-domain algorithm called the sign-Doppler estimator (SDE) is shown to have attractive properties. An evaluation based on an existing SEASAT processor is reported. The time-doma... View full abstract»

• ### Scan conversion of radar images

Publication Year: 1989, Page(s):166 - 175
Cited by:  Papers (6)  |  Patents (1)
| | PDF (672 KB)

The object of scan conversion is to resample a polar-sampled image into a Cartesian format while retaining integrity of the geometry and content of the image. Linear interpolation and decimation in two dimensions in the context of scan conversion are reviewed. Appropriate approximations of the nonlinear relationship between Cartesian and polar coordinates are then made to allow the application of ... View full abstract»

• ### Detectability of signals in Laplace noise

Publication Year: 1989, Page(s):190 - 196
Cited by:  Papers (17)
| | PDF (444 KB)

Closed-form expressions for the false-alarm and detection probabilities attained by the optimum and the linear detectors of a positive signal in n independent samples of noise having a bilateral exponential or Laplace distribution require lengthy computation when n is large, and those for the optimum detector suffer from round-off error because their terms alternate in sign. It i... View full abstract»

## Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the organization, design, development, integration, and operation of complex systems for space, air, ocean, or ground environment.  These systems include, but are not limited to, navigation, avionics, spacecraft, aerospace power, radar, sonar, telemetry, defense, transportation, automated testing, and command and control.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Lance Kaplan
Army Research Laboratory