Monopulse radar avoids problems seen in conical scanning radar systems, which can be confused by rapid changes in signal strength. Performance analysis of spacetimeadaptive monopulse. As shown in figure 3, the system uses a multielement antenna where the received signals consist of three types. As a preparation to adaptive beam forming, which is treated in several other sections, the topic of pattern shaping by deterministic. Design and implemetation of a monopulse radar signal processor.
A realtime pulse compression of 16k points is accomplished by fpga with fft ip core technology. It also provides robust interference removal to remain functional in a littoral signal environment while removing multipath to reduce the effects of reflected. The name refers to its ability to extract range and direction from a single signal pulse. Shortrange fmcw monopulse radar for handgesture sensing. Digital monopulse doppler radar and dsp teaching 11 a tracking radar is a good support for dsp teaching a typical cursus about dsp is made of the following chapters. A method, system and computer program is disclosed for reducing range and angular ambiguities in a target data matrix output from a real beam monopulse radar sensor within a single beam for use in terrain morphing applications employed by brownout takeoff and landing aid systems. Design and performance of the monopulse pointing system of the dsn 34meter beamwaveguide antennas m. Furthermore, we confirm that the monopulse based aoa estimator maoa is comparable to the singletarget estimation performance of subspacebased algorithms with high complexity such as multiple signal classification music and estimation of signal parameters via rotational. Frontend processing for monopulse doppler radar figure 2. Signal processing steps signal sorting methods and direction finding as shown in figure 1, sig nal processing is basically a problem of signal detection, emitter parameter measurement and correlation, emitter so rting, identification, and operator notification. Signaltonoise ratio snr considering the presence of noise, the important parameter for detection is the signaltonoise ratio snr factors have been added for processing gain gp and loss l most radars are designed so that at this point we will consider only two noise sources.
Monopulse systems usually contain enhanced processing to give. Under the hypothesis of no target present, the pdf of the allrt test statistic is called a. The monopulse radar system according to claim 6, wherein said signal processing means is provided in correspondence with a channel for effecting signal processing on at least one receiving antenna, which includes correction means for correcting at least either the phase or amplitude of the calibration signal, and a control signal generating. Jeff holder 0 0 sensors and electromagnetic applications laboratory, georgia tech research institute, 7220 richardson road, smyrna, ga 300801041, usa 1 school of electrical and computer engineering, georgia institute. The applied monopulse technique determines the nature of information in the received signal prior to any processing. First, compute the conventional response of an array steered to an arrival direction. Monopulse is a type of radar that sends additional information in the signal in order to avoid problems caused by rapid changes in signal strength. It is commonly used in radar systems to determine the angleofarrival aoa of a target.
This seminar report explores the applications of digital signal processing in radar. Signalprocessing techniques for simulated wideband monopulse radar data 12, personal authors ronald j. One or more range bins are calculated to selectively determine one or more range segments from. Proceedings of international conference on information. The received wave is subject to a frequency shift doppler shift, f, and is also subject to a time delay the relative motion of. Strain3 this article describes the design, analysis, and performance prediction of a monopulse pointing system in a 34m beamwaveguide antenna of the deep space network dsn. Nov 03, 1998 monopulse radio frequency receiver 390 is coupled to the multiple feeds of antenna 350 and provides a monopulse sum and difference, video signal output.
Acoustics speech and signal processing icassp, 2010, 1419 march 2010, dallas. The concept of subarrays and monopulse estimation with arbitrary subarrays is developed. However, as the target angle approaches that of the jammer, mitigation performance is increasingly hampered and distortions are introduced into the resulting beam. The input of this interruption is a low active state and as the frequency of new samples is 2 mhz, a. Performance analysis of spacetimeadaptive monopulse pdf.
A spacefasttime adaptive monopulse technique pdf paperity. The snr analysis is given in section 5, and the simulation results are. For a ula, the arrival direction is specified by the broadside angle. Beamforming, radar detection and parameter estimation are described. Sometimes only a twochannel receiver is used, as the two difference signals are multiplexed into one with a switching arrangement. In this paper we obtain the probability density function pdf of r. The purpose of this paper is to illustrate a digital computer simulation meth dology to exploit a signalantenna analogy fo analysis andor design of radar monopulse antennas where the farfield pw. Monopulse is resistant to jamming which is one of the main reasons it is used in most radar systems today. Bickel prepared by sandia national laboratories albuquerque, new mexico 87185 and livermore, california 94550 sandia national laboratories is a multiprogram laboratory managed and operated by sandia corporation. Kaband monopulse antenna pointing calibration using. Low noise signal processing technique for monopulse. All three channels of ddc and dpc of monopulse digital receiver are. In this paper, the problem is well resolved by increasing the. Pdf detection and localization of multiple unresolved.
Model of a monopulse radar tracking system for student. A typical monopulse processor for phased array radars is. Signal processing techniques for simulated wideband monopulse radar data 12, personal authors ronald j. Monopulse gives much better target azimuth measurements than the estimating of the angular position shown in figure 1. The sumanddifference monopulse algorithm is used to the estimate the arrival direction of a narrowband signal impinging upon a uniform linear array ula. A spacefasttime adaptive monopulse technique eurasip. Monopulse systems usually contain enhanced processing to give better quality target code information. A monopulse radar is able to derive accurate angular measurements via intelligent processing of its sum and difference channel returns. In the fmcw radar, the transmitted signal is frequency modulated by a periodic sawwave function. Monopulse antenna signal processing issues armin w. The pdf and statistics are utilized to develop estimators of the target. Monopulse gives much better target azimuth measurements than the estimating of the angular position shown in figure 3.
Multitarget tracking and monopulse signal processing for. Gadre, associate professor abstract there has been an explosive growth in digital signal processing theory and applications over the years. The first pan involves the development of the probability density function pdf and statistics of the measured amplitude of the sum signal for an arbitrary number of unresolved rician targets. Mainbeam jamming poses a particularly difficult challenge for conventional monopulse radars. Monopulse processing for tracking unresolved targets dtic. A fourth signal, called the q difference is the diagonal difference of the quadrants. Instantaneous dynamic range loss is a critical problem when digital signal processing is performed on fixedpoint fpgas. Pentek radar topics, applications and pentek products. It can operate at a much lower interrogation rate to benefit others in the environment.
Angleofarrival estimation in antenna arrays based on. Unresolved objects, target tracking, data association, radar signal processing, monopulse. This updated and expanded edition of an artech house classic offers you a current and comprehensive treatment of. Due to its simplicity, the monopulse system is also used in many educational laboratories to teach antenna systems, microwave engineering and signal processing 25 29. Angle estimation for two unresolved targets with monopulse radar. Processing chain for a monopulse radar as shown in figure 1 will have a digital beam former dbf which would form the monopulse beam. Pdf synthetic aperture radar signal processing with. Hindawi publishing corporation eurasip journal on applied signal processing volume 2006 a spacefast time adaptive monopulse technique yaron seliktar 2 douglas b. This section gives a short survey of the principles and the terminology of phased array radar. Low noise signal processing technique for monopulse pointing of dsn 34meter diameter antennas i aung gudim, wodek gawronski jet propulsion laboratory 4800 oak grove dr.
Es3701u implements advanced signal algorithms for positive emitter identification and library classification. Addressing the adc as the dsp is running with interruption it1, the signal which will activate the interruption during at least 3 consecutive machine cycles have to be chosen. Estimation of breaklock in pll synthesizers for monopulse radar applications. Sum, azimuth and elevation channels are used in finding position of target in a beam. Detection and localization of multiple unresolved extended targets via monopulse radar signal processing. The complex monopulse technique is a processing approach. As a preparation to adaptive beam forming, which is treated in several other sections, the topic of pattern shaping. However, as the target angle approaches that of the jammer, mitigation performance is increasingly hampered and distortions are introduced into. Monopulse radio frequency receiver 390 is coupled to the multiple feeds of antenna 350 and provides a monopulse sum and difference, video signal output. Tracking separating targets with a monopulse radar. Monopulse processing for tracking unresolved targets is addressed in four pans. Digital signal processing 10 unit step signal a signal, which satisfies the following two conditions 1.
Phasecomparison monopulse also called phaseinterferometry describes a technique that can be used in radar and direction finding applications to accurately estimate the direction of arrival of a signal from the phase difference of the signal measured on two or more separated antennas. Jeff holder 0 0 sensors and electromagnetic applications laboratory, georgia tech research institute, 7220 richardson road, smyrna, ga 300801041, usa 1 school of electrical and computer. The gaussian mixture model gmm is introduced to model the probability density function pdf of the echo monopulse ratio. Difference beam aided target detection in monopulse radar. Monopulse processing for tracking unresolved targets. Pdf model of a monopulse radar tracking system for. Some radar signal processing algorithms take advantage of the return.
Monopulse radar signal processing this is a reallife example of the signal processing involved with a typical monopulse radar application. While the basic concept of monopulse pointing is not new, its application in the dsn is novel in two ways. Monopulse is a widely used technique to provide accurate angle measurements in the tracking radar. Radio frequency receiver 390 sum channel receives the input from circulatorduplexer 370 in the form of additively combined energy from the two lobes of the radiation pattern of antenna 350. Examples of monopulse sum and difference voltage patterns. Recently there have emerged techniques for angular estimation of several unresolved targets, meaning targets that are, in principle, merged within the same radar beam, can be extracted separately. This means that the choice of a certain monopulse technique will determine the construction of the radar antenna system. Signalprocessing techniques for simulated wideband. Pdf model of a monopulse radar tracking system for student. Model of a monopulse radar tracking system for student laboratory.
A radar signal processing system characterizing high instantaneous dynamic range and low system latency is designed based on a specifically developed signal processing platform. Experimental and simulation approach diffusionbonded wband monopulse array antenna for space debris radar effectiveness of repeat jamming using linear fm interference signal in monopulse receivers. Taking the advantage of the gmm, the algorithm can. These naturally include array signal processing beamforming, interference nulling or highresolution direction finding 10, 14 and multiplebeam monopulse 17. A highperformance signal processing system for monopulse. Signalprocessing techniques for simulated wideband monopulse. Angle estimation for two unresolved targets with monopulse.
Bickel prepared by sandia national laboratories albuquerque, new mexico 87185 and livermore, california 94550 sandia national laboratories is a multiprogram laboratory managed. Monopulse radar is a radar system that uses additional encoding of the radio signal to provide accurate directional information. Principle of a monopulse system one received echo is sufficiently. Low noise signal processing technique for monopulse pointing. In such cases spatially adaptive processing provides some interference suppression when the target and jammer are not exactly coaligned. P signal processing techniques for simulated wideband monopulse radar data 12, personal authors ronald j. Pdf fundamentals of signal processing for phased array. Design and performance of the monopulse pointing system of. Design and performance of the monopulse pointing system. Page count summary from jan 88 to jan 89 april 1990 43 16. Kaband monopulse antenna pointing calibration using wideband.
1302 1157 1555 1022 1322 420 880 171 1183 722 1550 1469 1376 946 1026 559 671 204 874 1213 1244 195 584 578 1397 217 346 338 1094 232 1284