The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, the space debris environment is analyzed, the crucial technology for the design of space surveillance radar is studied, and finally, combined with the actual data, the detection efficiency of radar is simulated and demonstrated.
This paper presents the architecture of digital array radar and analysis the key technologies, digital T/R modules, waveform generation and amplitude-phase control module based on DDS, frequency up/down convert, high efficiency power amplifier, hybrid digital/microwave multilayer circuit and high performance computing are described as the main technologies. The correlation between the microsystems...
This paper deals with some co-operative mechanisms involving both Electronic Support Measurement systems (ESM) and Radars aboard single or networked airborne military platforms to provide covert, long range or accurate targets localizations for situation awareness or targeting.
Recent advances in wideband digital waveform generation, analog to digital converters (ADC) and high speed parallel processing provide the technology to develop ultra wideband systems for simultaneous synthetic aperture radar (SAR) and ground moving target indication (GMTI) modes. These systems are designed at either VHF or UHF frequencies to minimize the foliage attenuation and clutter masking of...
This paper introduces a high resolution imaging method, which is based on hybrid sampling of the airborne MIMO radar, combined the single snapshot of MIMO radar with the synthetic aperture of SAR. The method represents an equivalent array algorithm that the PRF of the system can be reduced dramatically to the conventional SAR, such that large unambiguity areas we can get. Numerical simulations are...
Sparse signal processing is introduced to microwave imaging technology, which forms a new theory, new system and new methodology in microwave imaging. Defined as sparse microwave imaging, it means that by the sparse domain representation of the observed object, the sparse microwave signal is acquired by sparse sampling in space or time domain. After the signal processing and information extraction,...
Bistatic and networked radar are currently the subject of a high degree of interest, with advances being made in many areas. In particular, Passive Bistatic Radar, the characterisation of bistatic radar sea clutter, bistatic SAR Finally, some newer, longer term ideas on networked radar as an intelligent, adaptive distributed sensor system are presented and discussed.
Polarimetric SAR interferometry (POLINSAR) is a very promising technique by combining polarimetric technique and interferometric technique. It can be applied to the area of remote sensing and measurement of structure over forest terrain. At present, many POLINSAR systems were developed, and the first POLINSAR prototype in China is also developed by 38th Research Institute of CETC. Lots of data are...
Radar automatic target recognition (RATR) is an important function for modern radar. Target high resolution range profile (HRRP) contains target structure signatures, such as target size, scatterer distribution, etc., thereby radar HRRP target recognition has received intensive attention from the RATR community. Statistical modeling of target HRRPs is the key stage for HRRP statistical recognition,...
Airborne Radar Network has the advantage over Airborne Single Radar in three aspects. Firstly how does it have the performance of countering stealth airplane and of hiding itself; Secondly how does it shorten the time of detecting object; Lastly how does it improve the recognized precision and positioned precision of object.
In this paper a transponder system dedicating for the on-orbit calibration of the two primary active microwave sensors: radar altimeter and radar scatterometer are designed. The three major parameters: the height measured by the altimeter, and the backscattering coefficient measured by the altimeter and the scatterometer can be fulfilled in the same system. The transponders proposed in this paper...
A compact RISC/FPGA based hardware architecture for high resolution SAR signal processing is presented. Sensor data rates above 300 Mbit/s and image dimensions of 8k × 4k pixels are processed in real-time. A maximum power consumption of less than 16 W enables for usage on small UAVs.
In the paper, the different characteristics between the spotlight mode and the sliding spotlight mode of spaceborne SAR are discussed. The system index, especially, antenna azimuth steering angle etc of sliding spotlight mode are studied. The realization method of the mode is presented, At the same time, the Doppler de-ambiguity, the requirement of azimuth steering angle, and the dwell time of azimuth...
The characteristics of geosynchronous Earth orbit synthetic aperture radar (GEO SAR) are affected significantly by Earth rotation. This paper first proposes a series of analytical methods of satellite motion parameters in arbitrary earth orbit height under the Satellite local Coordinate System. Then several calculation formulas of SAR system parameters, such as SAR Quality, are modified and the potential...
An algorithm for detection of the air maneuvering target based on the reconstruction of time sampling is proposed. Space sampling is used to reconstruct time sampling, which is equivalent to increasing the number of time sampling in one array element. So the problem that the estimation precision is low when using the fractional Fourier transform (FRFT) directly is solved, which is caused by the limited...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.