In order to test and evaluate the jamming effect of electronic warfare weapons on missiles, a method based on seeker captive flight jamming test and missile flight simulation test is put forward, in which real data for the jamming effect of the electronic warfare weapon on seekers is obtained by seeker captive flight jamming test, and immitted into a missile digital simulation system to perform large numbers of missile flight simulation tests under jamming, then one could evaluate the jamming effect of the electronic warfare weapon on missiles according to the simulation test results. The method is demonstrated and validated by test and evaluation of the jamming effect of a smokescreen jamming device on TV guidance missiles. The results show that, the method proposed here not only overcomes the shortcomings of both pure digital simulation test and field test, but also combines their advantages, thus could be taken as an easy, economical and reliable method for testing and evaluating electronic jamming effect on missiles.
The effect and mechanism of smokescreen and stealth jamming on TV seekers are investigated by seeker captive flight jamming test. Based on a comprehensive analysis of large amounts of test results, we have discovered the laws of smokescreen and stealth jamming effect on the performance of TV seekers, such as tracking status, tracking error, measurement of line-of-sight angle and its angular rate. A rational explanation for the laws has also been presented based on the principle of stabilization of seeker optical axis. The results are not only useful for evaluating smokescreen and stealth jamming effect on TV guidance missiles, but also referential for the study of smokescreen and stealth mechanism and the anti-jamming design of imaging seekers.
Methods for quantitatively evaluating smokescreen jamming effect on electro-optical imaging systems are investigated.
Smokescreen jamming could degrade the target discrimination ability of imaging systems. Based on the theory of digital
image processing and the Johnson criterion for target detection and discrimination, which describes the quantitative
relationship between the resolving power and target discrimination ability of imaging systems, four rules for
quantitatively evaluating smokescreen jamming effect on imaging systems are proposed as the
target-discrimination-grade rule, target-discrimination-probability rule, target-discrimination-range rule and correlativity
rule. For the target-discrimination-grade rule, the smokescreen jamming effect is evaluated according to the change of
target discrimination grade of the imaging system after being jammed. For the target-discrimination-probability rule, the
jamming effect is evaluated according to the ratio of the discrimination probabilities of the imaging system before and
after being jammed. For the target-discrimination-range rule, the jamming effect is evaluated according to the ratio of the
discrimination ranges before and after being jammed, or the decline rate of discrimination range of the imaging system
after being jammed. For the correlativity rule, the jamming effect is evaluated and graded as three jamming levels
according to the correlativity between the images of the imaging system before and after being jammed, which could be
expressed with the mean absolute difference or correlation function between the images before and after being jammed.
Compared with the existing evaluation methods for the jamming effect on electro-optical imaging systems, the
evaluation rules given here are featured as more quantitative, objective and readily applicable.
The paper is devoted to a study of methods for quantitatively evaluating the jamming effect of a laser jamming device on
electro-optical imaging systems. Based on the theory of digital image processing and the Johnson criterion for target
detection and discrimination, four evaluation rules for laser jamming effect on electro-optical observation and aiming
devices are proposed. For the target-discrimination-grade, target-discrimination-probability, or target-discriminationrange
rule, the laser jamming effect is evaluated respectively according to the change of the target discrimination grade,
probability, or range of the imaging system after being jammed. For the correlativity rule, the jamming effect is
determined according to the correlativity between the two images of the imaging system before and after being jammed.
In order to evaluate laser jamming effect on electro-optical search and track systems, three evaluation rules are proposed
for the three working stages of the imaging system. At the searching or capturing stage, the jamming effect could be
evaluated respectively according to the change of the target detection or capture probability of the imaging system after
being jammed. At the tracking stage, whether the imaging system under jamming could produce effective tracking
errors, or whether the tracking errors exceed three times its normal tracking accuracy is proposed as the criterion for
determining whether the jamming is effective or not, and the jamming effect could be graded according to the jamming
success rate for numbers of tests. Finally, the test methods for laser jamming effect on electro-optical imaging systems
are discussed.
The paper is devoted to a study of methods for characterizing and diagnosing the beam quality of high energy laser. It begins with a review of the rationality and usability of the parameters that have been used for characterizing laser beam quality. Considering the specific characteristics of high energy laser, we suggest characterizing the beam quality of high energy laser with diffraction limit multiple β-factor and encircled energy ratio BQ. Then the selection of the referential (or ideal) beam for β-factor is discussed in detail and the far-field diffraction intensity distributions and divergent angles of various referential beams have been calculated and compared. The results show that among all of referential beams with the same diffraction area or external aperture size, the circular solid homogenous beam has the smallest far-field divergent angle, thus choosing such a beam as the ideal beam would be the most reasonable and strongly proposed. Finally, techniques for diagnosing the beam quality of high energy laser are presented.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.