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Square waves enable radar implementation in modern digital technology giving power-efficent, compact and flexible radar solutions. Using a simple square wave generator and a sweep threshold quantizer we can realize a PN-sequence radar as well as a CW, SFCW, FMCW or a pulsed radar. The square wave receiver can utilize a digital XOR gate as a mixer and we present post layout simulations confirming our...
Multifunction RF systems which can operate with different RF functions like radar, communication and electronic warfare offer a variety of benefits beyond the well-known AESA (Active Electronically Steerable Antenna) features. To reach a sufficient technology maturity to start product development a series of challenges most stemming from the large required operation bandwidth have to be resolved....
A radar sensor for high speed moving objects is implemented using single chip CMOS UWB IC. To reduce the measuring and processing time for the fast moving target, the reliable and low power consumed envelope detection architecture is used at the expense of high resolution. The equivalent time sampling technique is adopted for UWB transceiver, employing delay locked loop and digitally synthesized impulse...
TRS-4D is the latest generation of the naval radars of Airbus DS Electronics and Border Security GmbH. TRS-4D is a multifunction radar for sea and air surveillance and target acquisition, operating in C-band. The radar is based on the latest Active Electronically Scanning Array (AESA) technology. With its capability to switch rapidly beam direction and waveform in combination with multiple functions,...
In studying the history of radar, it is evident that several of the earliest experiments were bistatic. It is interesting therefore to examine some of these experiments in the light of our current knowledge and experience. The paper describes Appleton's 1924 experiments to measure the height of the ionosphere (which was also the first FMCW radar), Watson Watt's celebrated Daventry Experiment in 1935,...
For the polarimetric-Doppler weather radar, sometimes there are artifacts caused by radar system itself or external sources displaying in the radar plan position indicator (PPI). These artifacts are not confined to specific range bins and also they are non-stationary when observed in the Doppler domain. This paper puts forward a method to suppress such clutter by designing the generalized spectral...
For automotive radar sensors the Doppler resolution is a key parameter, since it is used to separate targets which are in the same radial distance. For future applications the Doppler signature of targets can be exploited for classification purpose, e.g. discrimination among road users like pedestrians or bicyclists. In this paper, a signal processing scheme based on the chirp-sequence modulation...
Automotive radar sensors achieve a strongly increasing market penetration and are intensively used as sensors for Active Safety Systems from assisted driving to fully autonomous driving. That is true from Long Range Radar (LRR) to Short Range Radar (SRR) devices used for 360° radar surround view around a vehicle. In urban scenarios these sensors face complex conditions in not only detecting surrounding...
This article is focused on Precision Approach Radar with active electronically scanned antenna AESA. For more detailed explanation is presented only azimuth antenna. It was explained by the fundamental principle of weighting in the mode of transmission and reception. Final results are presented on the realized antenna.
In this paper, a guidelines for designing a volumetric ultra-wideband (UWB) antenna is proposed. The methodology is applied for the design of various travelling waves antenna shapes. A comparative study between various design geometries leads to a particularly interesting antenna dimensions: The K antenna. We demonstrate the use of an appropriate dielectric material is an efficient way to reduce the...
The forward scattering phenomenology is investigated in this work, providing a straightforward electromagnetic analytical model valid also in near-field conditions. A typical configuration useful for forward scatter radar operational scenarios, where a metallic object is illuminated while crossing a baseline, is considered. The effects of different target sizes on the scattered signal are evaluated...
Operation of sky wave radar in Canada is challenged by the presence of ionospheric clutter from the earth's auroral zone due to severe Doppler spreading, which results in clutter-limited detection of aircraft. Elevation angle control in the transmit and/or receive beams to separate the target can mitigate the auroral clutter to some degree, but may not be always effective especially when operating...
The Radar Warning and Information System (RAWIS), which is intended for civil protection applications and will support emergency teams engaged in complex mission contexts, is being designed and constructed in a consortium comprising eight partners. This paper presents the hardware design and realization of transmit and receive paths of the main radar system which is a stationary 3D imaging multiple...
Waveform diversity is considered to be an effective scheme for Electronic counter measures(ECM) jammers. Phase coded waveforms can be easily utilized in this Electronic counter-counter measures(ECCM) technique for conventional radar system, but they tend to suffer from severe losses caused by Doppler effects and may be inadequate to apply for SAR operation. In this paper, we propose a novel scheme...
This paper proposes a target detecting method for passive bistatic radar (PBR) using stepped-frequency radar as the transmitter. This method can resolve the energy spreading caused by range-Doppler coupling and achieve the integrated energy equal to that of the coherent integration approximately. This paper models the echo signal of the PBR using stepped-frequency radar as the transmitter mathematically...
For cone-cylinder targets, sliding-type scattering center is the most dominant nonideal scattering models. This nonideal phenomenon induces defocusing in radar imagery since it slides on the edge discontinuity with the change of incident angle. This paper proposes a method to discriminate among the ideal-type and sliding-type scattering centers on the cone-cylinder target based on the deviation degree...
This paper investigates the effectiveness of a passive radar for enhancing the security level in small airports and private runways. Specifically WiFi transmissions are parasitically exploited to perform detection and localization of non-cooperative targets that can be occupying the runway and the surrounding areas. Targets of interest include light/ultralight aircrafts, vehicles, people and even...
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