Radar system and related method of scanning remote objects

A method of scanning remote objects, comprising:

• arranging a plurality of first receiving devices to dispose on a first axis;
• arranging a plurality of second receiving devices to dispose on a second axis different from the first axis;
• arranging the plurality of first receiving devices for generating a plurality of first digital signals according to a plurality of first incoming signals, respectively, during a receiving mode;
• arranging the plurality of second receiving devices for generating a plurality of second digital signals according to a plurality of second incoming signals, respectively, during the receiving mode;
• and
• arranging a processing device to distinguish a first object and a second object, and the first object and the second object having a same radial speed and located at a same range;
• wherein the step of arranging the processing device to distinguish the first object and the second object comprises:
• performing a first beamforming operation to generate a plurality of first beamforming signals according to the plurality of first digital signals and a first gain matrix;
• performing a second beamforming operation to generate a plurality of second beamforming signals according to the plurality of second digital signals and a second gain matrix;
• and
• determining a first altitude angle of the first object and a second altitude angle of the second object according to the plurality of first beamforming signals, and to determine a first azimuth angle of the first object and a second azimuth angle of the second object according to the plurality of second beamforming signals;
• wherein the step of performing the second beamforming operation further comprises:
• determining the second gain matrix such that a power of a side lobe of an equivalent receiving radiation pattern of the plurality of second receiving devices is at least 13 dB smaller than a power of a main lobe of the equivalent receiving radiation pattern of the plurality of second receiving devices.

A radar system, comprising:

• a processing device;
• a plurality of first receiving devices, coupled to the processing device, for generating a plurality of first digital signals according to a plurality of first incoming signals, respectively, during a receiving mode, wherein the plurality of first receiving devices are disposed on a first axis;
• and
• a plurality of second receiving devices, coupled to the processing device, for generating a plurality of second digital signals according to a plurality of second incoming signals, respectively, during the receiving mode, wherein the plurality of second receiving devices are disposed on a second axis different from the first axis;
• wherein, based on the plurality of first digital signals and the plurality of second digital signals, the processing device is further arranged to distinguish a first object and a second object, and the first object and the second object have a same radial speed and are located at a same range;
• and the processing device is further arranged to perform a first beamforming operation to generate a plurality of first beamforming signals according to the plurality of first digital signals and a first gain matrix, and arranged to perform a second beamforming operation to generate a plurality of second beamforming signals according to the plurality of second digital signals and a second gain matrix;
• and arranged to determine a first altitude angle of the first object and a second altitude angle of the second object according to the plurality of first beamforming signals, and to determine a first azimuth angle of the first object and a second azimuth angle of the second object according to the plurality of second beamforming signals;
• wherein the processing device is further arranged to determine the second gain matrix such that a null of an equivalent receiving radiation pattern of the plurality of second receiving devices is located around an azimuth angle of the side lobe of the radio frequency (RF) beam.

A method of scanning remote objects, comprising:

• arranging a plurality of first receiving devices to dispose on a first axis;
• arranging a plurality of second receiving devices to dispose on a second axis different from the first axis;
• arranging the plurality of first receiving devices for generating a plurality of first digital signals according to a plurality of first incoming signals, respectively, during a receiving mode;
• arranging the plurality of second receiving devices for generating a plurality of second digital signals according to a plurality of second incoming signals, respectively, during the receiving mode;
• and
• arranging a processing device to distinguish a first object and a second object, and the first object and the second object having a same radial speed and located at a same range;
• wherein the step of arranging the processing device to distinguish the first object and the second object comprises:
• performing a first beamforming operation to generate a plurality of first beamforming signals according to the plurality of first digital signals and a first gain matrix;
• performing a second beamforming operation to generate a plurality of second beamforming signals according to the plurality of second digital signals and a second gain matrix;
• and
• determining a first altitude angle of the first object and a second altitude angle of the second object according to the plurality of first beamforming signals, and to determine a first azimuth angle of the first object and a second azimuth angle of the second object according to the plurality of second beamforming signals;
• wherein the step of performing the second beamforming operation further comprises:
• determining the second gain matrix such that a null of an equivalent receiving radiation pattern of the plurality of second receiving devices is located around an azimuth angle of the side lobe of the radio frequency (RF) beam.