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Tuesday, July 7, 2020 | History

2 edition of Optimum processing of unequally spaced radar pulse trains for clutter rejection found in the catalog.

Optimum processing of unequally spaced radar pulse trains for clutter rejection

L. E. Brennan

Optimum processing of unequally spaced radar pulse trains for clutter rejection

by L. E. Brennan

  • 223 Want to read
  • 1 Currently reading

Published by Rand Corp.] in [Santa Monica, Calif .
Written in English

    Subjects:
  • Radar -- Interference.

  • Edition Notes

    StatementL.E. Brennan, I.S. Reed.
    SeriesPaper / Rand -- P-36573657, P (Rand Corporation) -- P-3657.
    ContributionsReed, Irving S.
    The Physical Object
    Pagination11 p. ;
    Number of Pages11
    ID Numbers
    Open LibraryOL20572145M

    4 is the receive aperture at the radar. The result is P tG tG rλ2σ (4π)3 R4 (6) The received power, P r, can be written in terms of signal-to-noise ratio (SNR), S/N,andthermalnoisepowerkT 0BN F,wherek is Boltz- man’s constant, T 0 is the noise temperature of the radar,B is the noise bandwidth of the radar receiver, and N F is its noise figure. Substituting. A multiple range interval clutter cancellation circuit for MTI radars is disclosed, for assuring cancellation of narrow band clutter in the second or further range interval, while preserving wideband cancellation in the nearer range intervals and economizing on the number of fill pulses. The circuit includes two clutter cancellers. One canceller has a relatively narrow band clutter rejection.

    A monostatic radar has the transmitter collocated with the receiver. The transmitter generates a pulse which hits the target and produces an echo received by the receiver. By measuring the location of the echoes in time, we can estimate the range of a target. This example focuses on a pulse radar system design which can achieve a set of design. Space-time adaptive processing (STAP) can achieve optimum clutter rejection via implicit platform motion compensation. In this report the fundamentals and properties of STAP applied to air- and spacebome MTI radar are summarised. The effect of platform motion on the characteristics of airborne clutter is discussed.

    and the sidelobe clear region is a function of the relative radar-target velocity ra-tio and is shown in Fig. for four cases. Case 1 is where the radar and target speeds are equal and the target can be seen clear of sidelobe clutter in a head-on TARGET OR ANTENNA AZIMUTH (degrees). Factors affecting radar performance. The performance of a radar system can be judged by the following: (1) the maximum range at which it can see a target of a specified size, (2) the accuracy of its measurement of target location in range and angle, (3) its ability to distinguish one target from another, (4) its ability to detect the desired target echo when masked by large clutter echoes.


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Optimum processing of unequally spaced radar pulse trains for clutter rejection by L. E. Brennan Download PDF EPUB FB2

Optimum Processing of Unequally Spaced Radar Pulse Trains for Clutter Rejection. by $ 20% Web Discount: Discussion of methods to improve the performance of radar by rejecting the external clutter from echoes. based on the maximum signal-to-clutter ratio, is developed for selection of the pulse weights.

No direct method for Cited by:   Optimum Processing of Unequally Spaced Radar Pulse Trains for Clutter RejectionCited by: A train of radar pulses from one resolution cell can be processed coherently to reject echoes from external clutter and detect targets moving radially with respect to the clutter.

Optimum methods of signal processing are defined for systems in which the interpulse spacings are multiply staggered to avoid target blind speeds. A train of radar pulses from one resolution cell can be processed coherently to reject echoes from external clutter and detect targets moving radially with respect to the clutter.

Optimum methods. Synthesis of Finite Length Multi Level Sequences for Clutter Rejection in Radar. systems for radar and deep-space ranging problems [].

MODULATED PULSE TRAINS FOR CLUTTER REJECTION IN. This third edition of 'Principles of Space-Time Adaptive Processing' provides a detailed introduction to the fundamentals of space-time adaptive processing, with emphasis on clutter suppression in airborne or space based phased array radar, covering specifically the principles of airborne or space based MTI radar for detection of slow moving targets for use in the fields of earth observation, surveillance and reconnaissance, with special attention paid to clutter rejection techniques.

Then the common assumption for standard RD processing, i.e. a target should stay in trains-the most popular radar signal * Diversity in pulse trains, including stepped frequency pulses. [Bre68b] Brennan, L.

E., Reed, I. () Optimum processing of unequally spaced radar pulse train for clutter rejection. IEEE Transactions on Aerospace. where p(t) is a rectangular pulse, as defined in ().A periodic impulse train consists of impulses (delta functions) uniformly spaced T 0 seconds apart.

An application of a periodic impulse train is in the ideal sampling process. Using (), an even periodic impulse train, as shown in Figure b, can be analytically expressed as follows.

Pulse-Pair Processing. To distinguish a moving target of a fixed object with help of the Doppler frequency, at least two periods of the deflection must be compared with each other. Since the Doppler- frequency (few Hertz) is small relatively to the transmitted frequency (much Mega-Hertz), therefore a phase comparison is more easily to carry out than a direct frequency comparison technically.

Publisher Summary. This chapter describes the following principal improvements required in pulse radar: (1) more consistent echo painting, (2) improved ability to see wanted echoes through distributed clutter, (3) better rejection of extended discrete-object clutter, (4) improved ability to distinguish target size and shape, (5) more accurate position and velocity information, (6) improved.

• Normal radar functions: 1. range (from pulse delay) 2. velocity (from Doppler frequency shift) 3. angular direction (from antenna pointing) • Signature analysis and inverse scattering: 4. target size (from magnitude of return) 5. target shape and components (return as a function of direction) 6.

moving parts (modulation of the return). cross ambiguity function contributions for the pulse train. Letting p n = 0 and s n(t) = s0(t) ∀n, we have a uniformly spaced pulse train. In this paper, we investigate the ambiguity properties of pulse trains with staggered pulses in each PRI.

/10/$ © IEEE The problem of detection of coherent radar signals with unknown Doppler shift in noise plus clutter, which is assumed to be gaussian is addressed. The authors solve the detection problem and find the optimum ALR detector.

Since it includes a difficult integral, they derive several suboptimum detectors including CGLR, AALR and CALR. Comparison of these detectors via computer simulations shows. Pulse Compression Gain. With the help of pulse compression, a relatively long transmission pulse with comparatively low peak power can achieve a better, longer range than the basic radar equation would suggest.

This is because pulse compression can still detect echo signals that have already disappeared in the noise before pulse compression. Matthias Weiß, in Academic Press Library in Signal Processing, Volume 7, Sparse Sampling in Range and Doppler. For the second example we consider a pulse radar which emits a pulse train with a given pulse repetition time interval (PRI) or reciprocal pulse repetition frequency (PRF), respectively.

The samples are then arranged into a matrix form with one index corresponding to the. Optimum Processing of Unequally Spaced Radar Pulse Trains for Clutter Rejection.

A Comparison of Average Likelihood and Maximum Likelihood Ratio Tests for Detecting Radar Targets of Unknown Doppler Frequency Quantization Noise in Digital MTI Systems. A Recursive Method of Computing the Q-Function. The problem of separating unknown signals from much stronger ‘coloured’ noise often arises in radar receivers (m.t.i.

cancellers) and antenna sytems (directive noise in phased-array antennas). Two main optimisation criteria can be used to design rejection filters, namely (i) the maximisation of average signal/interference ratio (based on the evaluation of the eigenvectors of the.

Purchase Radar Signals - 1st Edition. Print Book & E-Book. ISBNTwo common strategies to improve measure or performance in a clutter environment are: Moving target indication, which integrates successive pulses and; Doppler processing, which uses filters to separate clutter from desirable signals.

The most effective clutter reduction technique is pulse-Doppler radar with Look-down/shoot-down capability. Radar Space-Time Processing for Range-Folded Spread-Doppler Clutter Mitigation by William W. Lee Department of Electrical and Computer Engineering Duke University Date: Approved: Je rey L.

Krolik, Supervisor Lawrence Carin Loren W. Nolte Matthew S. Reynolds David L. Banks Dissertation submitted in partial ful llment of the requirements for the.Optimum Processing of Unequally Spaced Radar Pulse Trains for Clutter Rejection.

A Comparison of Average Likelihood and Maximum Likelihood Ratio Tests for Detecting Radar Targets of Unknown Doppler Frequency General Shift-Register Sequence Generators.

Effect of Non-uniform Frequ~ency Spacing 5N for Noncoherent Processing v \h.7) _____ CONTENTS EFFECT OF COHERENT AND NONCOHERENT PROCESSING OF RETURNS 57 FROM FREQUENCY-AGILE RADAR PULSE TRAINS ON TARGET-CLUTTER CONTRAST RATIO FOR TARGETS EMBEDDED IN GROUND CLUTTER Effect of Coherent Processing on Target .