Detection of weak signals of unknown parameters

A system for processing of electro-magnetic signals, comprising a third processing circuitry, the third processing circuitry configured to perform a computerized method, the computerized method comprising the following:

• i. receive at least one sampled received signal, comprising at least one emitted signal emitted by a transmitter;
• ii. determine a plurality of points in a parameter space, wherein each point in the parameter space of the plurality of points comprises:
• a value of pulse width, a value of Pulse Repetition Interval (PRI), a value of initial time, and a value of number of integrated pulses, wherein the number of integrated pulses is at least two,
• wherein the plurality of points in the parameter space are non-identical;
• iii. repeatedly performing the following, wherein each repetition is performed in respect of a unique point of the plurality of points:
• perform an integration associated with the at least one sampled received signal, based on the unique point,
• thereby deriving at least one corresponding integrated power correlating the at least one sampled received signal with the unique point,
• the repetition thereby deriving a plurality of corresponding integrated powers,
• the repetition constituting a search in the parameter space;
• iv. determine a derived integrated power, of the plurality of corresponding integrated powers, which meets a signal-to-noise (SNR) condition, the derived integrated power constituting a chosen integrated power;
• v. determine a determined point in the parameter space, of the plurality of points in the parameter space that correlates with the chosen integrated power;
• and
• vi. determine that parameter values corresponding to the determined point constitute parameters of the at least one emitted signal, wherein the parameters comprise one or more of a determined pulse width, a determined Pulse Repetition Interval (PRI), and determined initial time,
• thereby detecting the at least one emitted signal.

An antenna system, configured to detect electro-magnetic signals, comprising:

• a. an antenna;
• b. a sectoral feed manifold, the sectoral feed manifold comprising a plurality of feeds located on a focal surface of the antenna;
• and
• c. a third processing circuitry, the third processing circuitry configured to perform a computerized method,
• wherein the antenna is configured to function as a two-dimensional focusing element, having spherical symmetry,
• wherein the antenna system is configured such that a planar wave-front impinging on the antenna, the planar wave-front associated with at least one electro-magnetic signal, is focused by the antenna to a feed of the plurality of feeds, the feed situated at a distance from the antenna corresponding to a focal distance of the antenna along a propagation vector of the planar wave-front,
• wherein the spatial field of view of the antenna system is based on a number of the plurality of feeds and the spacing between feeds of the plurality of feeds,
• wherein the spacing between the feeds is equal to or less than half of a wavelength of the at least one electro-magnetic signal,
• the antenna thereby producing a plurality of high-gain beams, each respective high-gain beam of the plurality of high-gain beams associated with each feed of the plurality of feeds, wherein the direction of the each respective high-gain beam is along the line connecting a center of the spherical symmetry and the each feed,
• wherein the sectoral feed manifold comprises two opposite halves, wherein the two opposite halves are divided along a symmetry line along the E-field,
• wherein the each feed comprises an RF choke, thereby enabling reduction of electro-magnetic coupling between adjacent feeds,
• wherein the RF choke comprises an RF current barrier, which is carved into the sectoral feed manifold in between at least some adjacent feeds,
• wherein the system comprises a sectoral polarizer inserted between the sectoral feed manifold and the lens,
• wherein a plurality of the respective high-gain beams constituting at least one sampled received signal,
• wherein the computerized method comprises the following:
• i. receive the at least one sampled received signal, comprising at least one emitted signal emitted by a transmitter;
• ii. determine a plurality of points in a parameter space, wherein each point in the parameter space of the plurality of points comprises:
• a value of pulse width, a value of Pulse Repetition Interval (PRI), a value of initial time, and a value of number of integrated pulses, wherein the number of integrated pulses is at least two,
• wherein the plurality of points in the parameter space are non-identical;
• iii repeatedly performing the following, wherein each repetition is performed in respect of a unique point of the plurality of points:
• perform an integration associated with the at least one sampled received signal, based on the unique point,
• thereby deriving at least one corresponding integrated power correlating the at least one sampled received signal with the at least one unique point,
• the repetition thereby deriving a plurality of corresponding integrated powers,
• the repetition constituting a search in the parameter space;
• iv. determine a derived integrated power, of the plurality of corresponding integrated powers which meets a signal-to-noise (SNR) condition, the derived integrated power constituting a chosen integrated power;
• v. determine a determined point in the parameter space, of the plurality of points in the parameter space that correlates with the chosen integrated power;
• and
• vi. determine that parameter values corresponding to the determined point constitute parameters of the at least one emitted signal,
• thereby detecting the at least one emitted signal.