Frequency diverse (FD) radar waveforms are attractive in radar research and practice. By combining two typical FD waveforms, the frequency diverse array (FDA) and the steppedfrequency (SF) pulse train, we propose a general FD waveform model, termed the random frequency diverse multi-input-multioutput (RFD-MIMO) in this paper. The new model can be applied to specific FD waveforms by adapting par...

In this paper we are explosively the fundamental theory of radar system modules STC (sensitivity time control) or sea clutter and FTC (fast time constant) or rain clutter. The STC and FTC are commonly used to some clutter. The radar signal is widely used for weather forecast, air port traffic control, military and fire control. The system implements radar processing procedures in real time mode...

Clutter contamination is common in radar observations and is one of the major factors impacting quantitative applications. This can be particularly severe for ground based weather radar when observing the precipitation at low attitude and close range. Strong clutter can project observations with intense reflectivity as well as bias the Doppler moments. The NSF engineering research center of col...

HF radar can provide Over the Horizon detection of ships on very large oceanic areas, making use of the ionospheric refraction of radio waves. The Doppler spectrum of the sea clutter is composed of the first-order Bragg lines with a second-order continuum, as described in [1]. Normally, the Doppler shift produces by ships is small, of the same order of magnitude of the Doppler shift of the sea ...

abstract according to the adventages of passive radars they have been reconsidered recently due to development of signal processing technology. in the field of sea targets detection using passive radar few research have been reported. this paper presents a new method to detect sea targets using adaptive filter weights variation model and using the fact that the radar cross section of sea target...

in this paper, we deal with the problem of adaptive coherent signal detection in gaussian interference (clutter plus noise) for surveillance pulse radars. some of the adaptive radar detectors exploit the ar model for clutter. most of these detectors have been obtained using the glr test. this test relies on the maximum likelihood estimation whose accuracy depends on the number of data. whereas,...

Automotive radars for potential accident reduction and for autonomous cruse control were available in 1999, and 77 GHz long-range radars and 24 GHz short-range radars are developing [1]. 79-GHz shortrange automotive radars have a bandwidth of 4 GHz, a maximum range of 30 m, and a range resolution of 5 cm. Radar reception signals often contain unwanted echoes, called “radar clutter.” Moving targ...

The mission of a ground moving target indication (GMTI) radar, as its name implies, is to detect and classify ground-based vehicles, even ones with very low velocities. This type of radar can provide a wide area of coverage and frequent updates of a specific area of interest if the radar is placed on a satellite with a low earth orbit. However, because of the large footprint of the radar on the...

space-time adaptive processing is used for clutter mitigation in airborne radars. in this paper, deterministic clutter subspace and direct data domain methods are introduced due to the fact that space-time adaptive processing algorithm requires estimating covariance matrix, limited training data and high complexity in processing. in first proposed method, filter coefficients are calculated by e...

Space-time adaptive processing (STAP) is an important airborne radar technique used to improve target detection in clutter-limited environments. Effective STAP implementation is dependent on accurate space-time covariance matrix estimation. Heterogeneous clutter, including spiky, spatial clutter variation, violates underlying STAP training assumptions and can significantly degrade corresponding...