The basic concept of radar is relatively simple even though in many instances its practical implementation is not. A radar operates by radiating electromagnetic energy and detecting the echo returned from reflecting objects (targets). The nature of the echo signal provides information about the target. The range, or distance , to the target is found from the time it takes for the radiated energ...

The most usual ways of observation of satellites and space debris and measurement of their orbits are • telescopic images, • radar reflections, • laser measurements. We use two of these three modalities, we combine telescopic images with response of Doppler radars. We use single images from a terrestrial telescope. Our radar is passive, we receive the signal of a distant terrestrial transmitter...

Since there is a frequency offset between each adjacent antenna of FDA radar, exists angle-range two-dimensional dependence in the transmitter. For bistatic FDA-multiple input multiple output (MIMO) range-direction departure (DOD)-direction arrival (DOA) information coupled transmitting steering vector. How to decouple three has become focus research. Aiming at issue target parameter estimation...

U) This is the final report for a study performed for the 1992 LDRD spaceborne SAR (Synthetic Aperture Radar) study. This report presents an overview of some of the issues that must be considered for design and implementation of a SAR on a spaceborne platform. The issues addressed in this report include: a survey of past, present, and future spaceborne SARS; pulse-repetition frequency (PRF); ge...

One-bit ∆Σ modulation in a wireless transmitter is studied as a potential candidate for multifunction broadband transmit front ends. Characterizing a single ∆Σ modulated transmit element is the first step towards a transmit array for radar/communication applications. A wireless link directly driven by a 2 Gb/s ∆Σ bit sequence is analyzed through simulation and measurement. Effects of clock jitt...

Residential or occupational exposures to electric or magnetic fields have been reported to be associated with health problems, particularly cancer and reproductive mishaps. Misconceptions about these alleged effects continue to be published in the medical and scientific literature. Invalid statements relating to these effects are challenged in this paper. Case reports and studies dealing with e...

We introduce the stripmap mode test of X-band AutoSAR (automobile synthetic aperture radar) prototype in this paper. We design and develop a power amplifier, a signal demodulator, and use Matlab for post-processing. The transmitter of this prototype, however composes measurement instruments, an Arbitrary Waveform Generator (N8241A, Keysight) for chirp generation and a Vector Signal Generator (E...

An incoherent scatter experiment using alternating coded pulses has been implemented at Jicamarca. The experiment is intended to facilitate aeronomy research in the topside and protonosphere. By virtue of utilizing the full duty cycle capabilities of the radar transmitter, the experiment has improved sensitivity over the conventional double pulse experiment and permits multiple parameter estima...

To retrieve a high-resolution vector signal from a set of measured low-resolution vector signals, we deliberately delayed the synchronization between the transmitter and the receiver of a pulsed laser radar (lidar). Once several range-shifted low-resolution vector signals had been obtained, we independently applied a regularization method and the singular-value-decomposition method to restore h...

—The paper introduces a frequency independent phase shifting technique suitable for RADAR, satellite and wireless telecommunications applications. The proposed phased array transmitter achieves a high degree of precision along with an arbitrary small phase step value. The theory governing the design of the phase shifter is thoroughly discussed and three prototypes operating in different bands r...