Distributed radar system and method of operation thereof
Distributed radar systems and techniques for processing data received from such distributed radar systems. The distributed radar systems may utilize data on beam spatial pattern for processing collected signals and determining direction of one or more reflection origins (e.g., one or more objects reflecting transmitted signal).
1 . A distributed antenna system, comprising:
a plurality of antenna units arranged in a predetermined spaced apart arrangement in a selected region and configured to collectively transmit an output radiation signal and receive collected radiation signals, the output radiation signal having a known beam structure including a plurality of spatial features within a beam envelope;
a control system connected to the plurality of antenna units and configured for:
transmitting operational instructions to said plurality of antenna units for transmitting the output radiation signals;
receiving data indicative of collected radiation signals, collected in response to a reflection of the output radiation signal, and
processing the data indicative of the collected radiation signals and determining at least data on an angular location of one or more objects associated with said collected radiation signals;
wherein, distances between the plurality of antenna units are larger than a wavelength of the output radiation signal transmitted or received by the antenna system; and
wherein, said processing comprising, for at least one axis: applying a first mono-pulse beam processing characterized by a first angular shift, and determining relative location of said one or more objects with respect to spatial features in the received beam, and applying a second mono-pulse beam processing characterized by a second angular shift different from the first angular shift for determining location of said one or more objects with respect to said arrangement of the plurality of antenna units;
wherein the first angular shift is determined in accordance with an angular width of the spatial features in the beam structure, wherein the second angular shift is determined based on an angular width of the beam envelope, being an integer multiple of an angular distance between the spatial features in the beam structure, and wherein the first angular shift is smaller with respect to the second angular shift.
2 . The distributed antenna system of claim 1 , wherein said plurality of antenna units are operated for transmitting said output radiation signal, and for receiving electromagnetic signals associated with reflection of said output radiation signal.
3 . The distributed antenna system of claim 1 , further comprising a separate receiving antenna arrangement comprises antenna units adapted for collecting electromagnetic signals associated with reflection of said output radiation signal.
4 . The distributed antenna system of claim 1 , wherein said plurality of antenna units comprise phase array antenna units.
5 . The distributed antenna system of claim 1 , wherein said second angular shift is further determined in accordance with said relative location of said one or more objects.
6 . The distributed antenna system of claim 1 , wherein said plurality of antenna units are arranged facing substantially parallel direction.
7 . The distributed antenna system of claim 1 , wherein said plurality of antenna units are arranged in conformity with certain environment pattern, phase and time delay of signal components adjusted between the plurality of antenna units for transmitting desired output radiation signal.
8 . The distributed antenna system of claim 1 , wherein said plurality of antenna units are configured for synchronous transmission of the output radiation signal.
9 . The distributed antenna system of claim 1 , wherein said plurality of antenna units comprise antenna units mounts on one or more moveable platforms.
10 . The distributed antenna system of claim 1 , wherein said processing comprises:
applying a first mono-pulse beam processing characterized by a first angular shift along first selected axis, and determining relative location of said one or more objects with respect to selected received beam;
applying a second mono-pulse beam processing characterized by a second angular shift along said first selected axis and determining location of said one or more objects with envelope structure of received beam along said first selected axis;
repeating said first and second mono-pulse processing utilizing corresponding first and second angular shifts along a second axis, being non-parallel with said first axis, and determining location of said one or more objects with envelope structure of received beam along the second selected axis.
11 . The distributed antenna system of claim 1 , wherein said processing further comprises determining distance of said one or more objects in accordance with time delay between time of transmission of signal and time of collecting of collected radiation signals portions.
12 . The distributed antenna system of claim 1 , wherein said processing further comprises determining closing velocity of said one or more objects in accordance with doppler shift of collected radiation signals.
13 . The distributed antenna system of claim 1 , wherein each of said first and second mono-pulse processing comprise determining first and second receive beams shifted between them by a selected angular shift, and determining a predetermined relation between said first and second receive beams, said predetermined relation being indicative of angular location of said one or more objects within span of said angular shift.
14 . A control unit for use in distributed radar system having a plurality of antenna units arranged in a predetermined spaced apart arrangement in a selected region and configured to collectively transmit an output radiation signal and receive collected radiation signals, the output radiation signal having a known beam structure including a plurality of spatial features within a beam envelope, with distances between the plurality of antenna units that are larger than a wavelength of the output radiation signal transmitted or received by the radar system, the control unit comprising:
a communication module configured for communicating with a plurality of antenna units for receiving input data indicative of collected radiation signal portions from said plurality of antenna units, said radiation signal portions being associated with reflected signal portions from one or more objects;
at least one processor, said processor comprises a localization module adapted for processing said input data and determining location of one of more objects;
said processing comprises for at least one axis: applying a first mono-pulse beam processing characterized by a first angular shift, and determining relative location of said one or more objects with respect to spatial features in a received beam by said plurality of antenna units, and applying a second mono-pulse beam processing characterized by a second angular shift different from the first angular shift for determining angular location of said one or more objects with respect to said arrangement of plurality of antenna units;
wherein the first angular shift is determined in accordance with an angular width of the spatial features in the beam structure, wherein the second angular shift is determined based on an angular width of the beam envelope, being an integer multiple of an angular distance between the spatial features in the beam structure, and wherein the first angular shift is smaller with respect to the second angular shift.
15 . The control unit of claim 14 , wherein said control unit comprises storage utility and at least one processor, said storage utility comprises array location data indicative of locations of said plurality of antenna units, said at least one processor comprises beam calculator adapted for using data of location of said plurality of antenna units and data on beam to be transmitted by said plurality of antenna units for determining beam features data indicative of toothlike features in the transmitted or received beam.
16 . A software product embedded in a non-transitory computer readable medium and comprising computer instructions that when executed by one or more computer processor cause the processors to:
acquire data indicative of a predetermined spaced apparat spatial arrangement of a distributed antenna system comprising a plurality of antenna units in a selected region and of a known beam structure of an output radiation signal collectively transmitted by the plurality of antenna units, of the known beam structure including a plurality of spatial features within a beam envelope, wherein distances between the plurality of antenna units are larger than a wavelength of the output radiation signal transmitted or received by the distributed antenna system;
receive input data collected from a plurality of antenna units and indicative of collected electromagnetic radiation signals associated with reflection of the transmitted output radiation signal from one or more objects;
processing the input data for determining location of said one or more objects with respect to said arrangement of a plurality of antenna units, said processing comprises:
applying a first mono-pulse beam processing characterized by a first angular shift, and determining a relative location of said one or more objects with respect to spatial features in a received beam, and
applying a second mono-pulse beam processing characterized by a second angular shift different from the first angular shift for determining location of said one or more objects with respect to said arrangement of plurality of antenna units;
wherein the first angular shift is determined in accordance with an angular width of the spatial features in the beam structure, wherein the second angular shift is determined based on an angular width of the beam envelope, being an integer multiple of an angular distance between the spatial features in the beam structure, and wherein the first angular shift is smaller with respect to the second angular shift.