Moving target indication

About: Moving target indication is a research topic. Over the lifetime, 2653 publications have been published within this topic receiving 32435 citations.

Ultra wideband, multi-mode radar processing

Abstract: 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. A system equipped with this capability will provide uninterrupted coverage on targets entering and exiting the main-beam clutter of the Radar, typically seen in move-stop-move environments. The evolving challenge is to develop a common waveform, with emphasis on real-time signal processing, for ubiquitous target detection that employs SAR, along-track interferometry (ATI) and GMTI for advanced tracking.

RCS analysis on different targets and bistatic angles using LTE frequency

Abstract: Moving target detection and location are a function of dependent bistatic Radar Cross Section (RCS) and radar design parameters which in our experimental study used long-term evolution (LTE) signal as a source for passive bistatic radar (PBR). Moving target also can be classified in positions of different bistatic radar angles using conventional processing approaches which we performed a simulation using Computer Simulation Technology (CST) Microwave studio. The target bistatic radar cross-section, sb will give a realistic calculation on PBR performance with the requirement of complete treatment. The targets used are Toyota Rush (SUV) and Proton Exora (compact MPV) as a moving target had been designed based on the actual size to observe the performance of RCS due to the changing of bistatic angle between transmitter and receiver. The frequency transmit signal from LTE based station is 2.6 GHz, far-field conditions and the material used for the moving target is perfect electrical conductor. Simulation used different bistatic angles which are 59° and 90° of plane wave propagation. The simulation results show that largest area of moving target had better outcome that reliable with Babinet's principle, which declares a target of physical cross-sectional area is proportionate to RCS. The variation of RCS also depends on the shape of moving target, size of moving target and angles of plane wave. This might improve the sensitivity elevation targets with an adjustment of receiver angle to the target and transmitter for a better RCS performance.

Hybrid filter employing digital techniques and analog components and amti radar employing same

Abstract: A filter employing the principles of digital filters representative of Z-transform solution of mth-order difference equations is implemented using analog components; arithmetic units are realized by resistive networks employed with operational amplifiers, and memory elements are realized by the use of switched capacitors. A particular embodiment comprises a cascade implementation of a Cauer or elliptic filter applied to range-gated clutter attenuation in an airborne moving target indicator (AMTI) radar; time sharing of arithmetic units among range bins, multiplexing of slow filters for achievement of faster overall system response, and electronically variable filter characteristics (through electronic component selection) are disclosed.

Stagger period selection for moving-target radars

Abstract: A moving-target-indication (m.t.i.) radar is used to reject signals from fixed, unwanted targets whilst retaining the Doppler shifted signals from moving targets. For a radar with a constant p.r.f., nulls in the m.t.i. response (`blind speeds?) occur at multiples of the p.r.f. in addition to the desired null at zero frequency. The frequency at which the first blind speed occurs may be extended by the use of a nonuniform pulse-repetition interval, or staggered p.r.f. This paper presents the results of an investigation into methods of selecting these stagger periods to achieve acceptable passband performance.

Moving target indicator with no blind speeds

Abstract: A moving target indicating system wherein a pulse source which generates radiofrequency drive pulses at a predetermined pulse repetition frequency is connected to the inputs of a pair of channels. The first channel includes a phase-dispersive filter having a first phase-slope dispersion characteristic, while the second channel has a phase-dispersive filter having a phase-slope dispersion characteristic which is the negative of that of the first filter. A pulse group comprising the output of the first and the second channels is transmitted periodically as each drive pulse is applied. The pulse repetition frequency is sufficiently low that when transmitted, echos of only one pulse of each group are received at a time. Due to the "matched" or "conjugate" phase-dispersive characteristics of the filters in the respective channels, the first channel operates in reception upon the reflected pulse originally generated in the second channel and compresses it thus resynthesizing or reconstituting a short duration pulse like the original, while the second channel operates in reception upon the reflected pulse generated in the first channel, compressing it to reconstitute a short duration pulse like the original. A canceler is switched between the outputs of the first and second channels to receive the two resulting reconstituted pulses of each group. In the usual application, fixed target information is cancelled out and moving target information is derived for application to a display device.