摘要:
An apparatus is provided comprising processing circuitry configured to process data indicating a receive signal of a sensor through isolating a locally stationary signal component of the receive signal from at least one of a stochastic and a deterministic signal component of the receive signal.
摘要:
L'invention concerne un procédé d'identification d'un émetteur radar, à partir d'un ensemble d'impulsions reçues correspondantes, chacune associée à un instant d'arrivée respectif, le procédé étant mis en oeuvre par ordinateur et comprenant les étapes : - détermination d'une signature observée de l'émetteur radar à partir d'une distribution des écarts temporels entre les instants d'arrivée successifs ; - pour chaque classe d'émetteurs parmi une pluralité de classes d'émetteurs prédéterminées, chaque classe d'émetteurs étant associée à au moins une signature attendue, calcul d'un score de proximité entre la signature observée et chaque signature attendue associée à ladite classe d'émetteurs, chaque signature attendue étant fonction d'une distribution attendue des écarts temporels entre des instants d'émission successifs pour ladite classe d'émetteurs, et pour un taux de perte d'impulsions prédéterminé ; et - affectation de l'émetteur radar à la classe d'émetteurs associée à la signature attendue conduisant au meilleur score de proximité.
摘要:
A method for generating pulse descriptor words (PDWs) including frequency and/or bandwidth data from time-varying signals 114/116 received by a sensor 103 includes filtering, at a plurality of blind source separation (BSS) modules 120, signals 124/126 derived from the time-varying signals 114/116, each BSS module 120 including a filtering subsystem 207 having a plurality of filter modules 207a/207b/207c. Each filter module 207a/207b/207c has a frequency filter coefficient ( α ) and is parameterized by a center frequency ( f ). The method also includes transmitting at least one blind source separated signal 129 from the BSS modules 120 to a PDW generation module 128 communicatively coupled to the filtering subsystem 207. The method further includes generating, using the PDW generation module 128 and based on the blind source separated signal 129, at least one PDW parameter vector signal 138 containing the frequency data. The method also includes updating, upon generating and based on the PDW parameter vector signal 138, values of α and/or f for each filter module 207a/207b/207c.
摘要:
A radar apparatus using a pulse compression technique, in which any automatic response signals are prevented from creating false radar images on the indicator screen of the radar apparatus. An antenna repeats a transmit/receive cycle at a second time interval while rotating, in which i) a non-modulated pulse is transmitted, ii) a modulated pulse is transmitted a first time interval after the transmission of the non-modulated pulse, and iii) an echo and/or an automatic response signal occurring after the pulse transmission is received. For each transmit/receive cycle, a first separated receive signal having a frequency band corresponding to that of the modulated pulse and a second separated receive signal having a frequency band corresponding to that of the non-modulated pulse are separated. An elimination process is applied to the first separated receive signal, in which respective first separated receive signals for two consecutive transmit/receive cycles are compared and any signal component having discontinuity between two consecutive transmit/receive cycles is eliminated from the first separated receive signal. A pulse compression process is applied to the first separated receive signal having undergone the elimination process. The first separated receive signal having undergone the pulse compression process is combined with the second separated receive signal.
摘要:
A radar apparatus (100) for detecting around a ship is provided. The apparatus (100) includes an unstable area detecting module (10) configured to observe a variation in a signal level corresponding to detection data over a plurality of scans, obtain unstableness of the observed detection data, and detect unstable areas (41, 42, 43, 44, 410, 420, 430, 440) based on the unstableness, a determining module (22) configured to measure a size of each of the areas and determine the area as a small target object area (41, 43) when the size of the area is below a given threshold, a processing module (6) configured to process the detection data corresponding to the small target object area (41, 43) to be emphasized when displayed, than the detection data corresponding to the other unstable area (42, 44), and a display unit (8) configured to display the processing result.
摘要:
Embodiments of the disclosed technology use high-speed interpolated (interdigitated) sampling for the specific purpose of GPR (Ground-Penetrating RADAR). This technology solves several issues associated with high-speed sampling in GPR which included 1) dynamic range limitations, 2) regulatory compliance issues, 3) sampler core offset error, and 4) timing errors. High-speed interpolated sampling GPR is implemented using a high-speed ADC in combination with trigger logic (such as an FPGA) and a programmable delay generator. The FPGA or other trigger logic generates a series of randomly dithered trigger pulses. A variable delay generator (or "Vernier") is synchronously controlled in order to produce the fractional timing. The timing of the pulses is randomly or pseudo-randomly dithered, and the phase of the interpolation is shuffled in order to avoid producing discrete spectral lines in the radiated RADAR signal.
摘要:
There is disclosed a method for filtering sea clutter in a radar echo using a hydrographic model. The method comprises the following steps : determination of parameter values of the hydrographic model using the radar echo; estimation of the sea clutter corresponding to the sea surface as deduced from the hydrographic model; filtering of the estimated sea clutter from the radar echo. Application : radar detection.