Rajesh Saini

Results of a Space-Surface Bistatic SAR Image Formation Algorithm

This paper reports progress in the development of an image formation algorithm suitable for stripmap space-surface bistatic synthetic aperture radar. A description of the proposed algorithm, which is a modification of the standard range-Doppler algorithm, is provided for the case when the transmitter and the receiver have parallel flight paths and unequal velocities. Both simulation and initial experimental results are presented to verify our analysis.

Direct path interference suppression in bistatic system: DTV based radar

Over the past 20 years, bistatic radar has been an emerging technology. One of the major problems in continuous wave bistatic radar is the direct path interference (DPI). The reflected signal from the target is received at the background of this interference; the target would be buried under the sidelobes of the DPI in the receiver circuit. The conventional solution to this problem is the use of an adaptive antenna, steering a null towards the interference. Unfortunately, this technology is most effective in quasi-stationary receivers. For surveillance radar, the null depth obtained is not enough. This paper proposes a new technique of DPI suppression, based on dynamic compensation. Some aspects of cross-polarisation isolation between the transmitter and receiver is also considered.

Space surface bistatic SAR with space-borne non-cooperative transmitters

This paper presents research results in space-surface bistatic synthetic aperture radar (SS-BSAR) with GNSS non-cooperative transmitters. The experimental-setup used to study the SS-BSAR is described. The signal processing algorithm that will be used to process the data collected from SS-BSAR is also discussed

Experiences Gained during the Development of a Passive BSAR with GNSS Transmitters of Opportunity

An electrode for a plasma arc torch comprises a copper holder having a lower end which mounts an emissive element serving as the cathode terminal for the arc during operation. A relatively non-emissive separator formed of silver alloyed with 0.5 to 4 percent of copper or other metals surrounds the emissive element and separates the emissive element from the copper holder at the exposed end face of the electrode. The separator serves to prevent the arc from detaching from the emissive element and attaching to the copper holder.

Modified Range-Doppler Algorithm for Space-Surface BSAR imaging

This paper reports progress in the development of an image formation algorithm suitable for space-surface bistatic synthetic aperture radar (SS-BSAR). An overview of the proposed algorithm in its current stage of development, a modification of the standard range-Doppler algorithm (RDA) is provided and some first experimental bistatic results obtained using the algorithm are presented

Development of space-surface bistatic synthetic aperture radar with GNSS trasmnitter of opportunity

This paper present an overview of the research being carried out by the University of Birmingham in the area of space-surface bistatic radar (SS-BSAR). Global navigation satellite system is considered as the transmitter of opportunity. It also highlights some of the problems faced when a receiver is mounted on a real aircraft. New experimental and imaging results are also presented.

Image formation algorithm for Space-Surface BSAR

This paper presents an overview of a generalised space-surface bistatic SAR (SS-BSAR) image formation algorithm. An analytical description of the algorithm is provided, and supported by simulation results.

Signal synchronisation in SS-BSAR based on GLONASS satellite emission

This paper presents the issue of synchronisation in space-surface synthetic aperture radar (SS-BSAR). GLONASS satellite system is considered as the transmitter of opportunity. Experimental testing of the synchronisation algorithm is also presented and verified. (5 pages)