Patent
Pulse doppler radar with a variable pulse repetition frequency
TLDR
In this article, a modified coherent integration is proposed for a pulse Doppler radar system with variable pulse repetition frequency, where the reflected pulses are subject to a simplified vectorial addition by the use of a number of filters.Abstract:
A pulse Doppler radar system with variable pulse repetition frequency has a coherent integrator to which the reflected pulses are supplied in order to avoid deterioration of the indication of a moving target given over-the-horizon reception. The coherent integrator subjects the reflected pulses to a simplified vectorial addition by the use of a number of filters. A precondition for the modified coherent integration is a staggering of the pulse repetition periods such that their sums formed over successive pulse repetition periods are constant, and a phase reference for the signal amplitudes is obtained such that the phase difference is equal to zero after every second pulse repetition.read more
Citations
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References
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Patent
Autocorrelation sidelobe suppression device for a continuous periodic phase-coded signal
TL;DR: In this paper, a scheme for suppressing autocorrelation sidelobes in a pseudo-random coded radar system employing a phase-coded CW signal in which the phase code is preselected to have a predetermined symmetry was proposed.
Patent
Pulse radar apparatus
TL;DR: In this article, the threshold level of the first comparator is maximally equal to that of the second comparator on the receipt of each two sequential video signals with an interval Delta T, the correlator causes that the gate circuit blocks the access to a PPI for the corresponding video signals supplied via the delay element.
Patent
Staggered pulse repetition frequency radar providing discrimination between first and second returns
Patent
Clutter filter for pulse doppler radar
TL;DR: In this paper, an improved clutter filter for a Pulse Doppler Radar utilizing rapidly changing p.r.f.'s was proposed to reduce the effect of spectrum spreading which has previously caused difficulties.