Accession Number : ADA300781

Title :   Target Discrimination/Cl1assification Radar.

Descriptive Note : Final rept. 1 Aug 92-31 Jul 95,

Corporate Author : MISSISSIPPI STATE UNIV MISSISSIPPI STATE

Personal Author(s) : Skinner, B. J. ; Ingels, Frank ; Donohoe, P.

PDF Url : ADA300781

Report Date : 01 AUG 1995

Pagination or Media Count : 152

Abstract : The purpose of this study was to develop a signal processing scheme that would combine the separate research efforts of low probability of intercept signaling, low altitude low observable target tracking, and non-cooperative target recognition into a single research effort. The end result of this fusion is a new radar design concept designated adaptive FSK/PSK signaling. An adaptive FSK/PSK radar system makes use of matched FSK/PSK signals in conjunction with a gradient descent adaptive signal design algorithm. Matched FSK/PSK signals are ultra wideband pseudorandom multiple frequency bi-phase modulated signal sequences that have spectral content specifically matched to the target under track. This use of target-specific information in the design of radar signals is the salient point of this research effort. It allows for more efficient use of signal power and results in a performance improvement over existing radar technologies that are matched to the transmit signal only. Since the spectral content of the target is not known a priori, the target range profile must be learned by the radar. This matching of the signal to the target is accomplished through the use of an iterative (adaptive) algorithm that is based on gradient descent. Once the radar has adapted to the target (learned the target), the range profile of the target is known and target identification can take place based on the learned range profile. Therefore, an adaptive FSK/PSK radar system can be thought of as a learning system as opposed to a measurement system. In other words, the radar measurement is improved as a result of the learning process. The pseudorandom sequence structure of the matched FSK/PSK signal, along with its high time-band-width product, makes the radar inherently difficult to detect.

Descriptors :   *RADAR TARGET DESIGNATORS, *TARGET DISCRIMINATION, *RADAR SIGNALS, *RADAR JAMMING, *COUNTER COUNTERMEASURES, ALGORITHMS, SIGNAL PROCESSING, SCATTERING, SIGNAL TO NOISE RATIO, RADAR TRACKING, WHITE NOISE, THESES, RESONANCE, RADAR CLUTTER, MATCHED FILTERS, TARGET CLASSIFICATION, PHASE SHIFT KEYERS, SIDELOBES, PULSE COMPRESSION, NOISE(ELECTRICAL AND ELECTROMAGNETIC), GROUND CLUTTER, FREQUENCY SHIFT KEYERS, RADAR INTERCEPTION.

Subject Categories : Radar Countermeasures
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE