Digital cumulative spectrum analysis apparatus and method for direction finding and location

A digital cumulative spectrum analysis apparatus for location, comprising:

• a converting unit configured to convert signals inputted from antennas into digital signals, reduce a sampling rate of the digital signals by converting the digital signals into baseband signals through a digital down converter (DDC), and convert the baseband signals into complex digital data;
• an estimator configured to estimate positions of the signals based on a predetermined location method;
• a spectrum processing unit configured to map the positions into a complex waveform image map memory, and allocate different colors to the positions depending on the accumulation ratio of the positions;
• and
• a display unit configured to display the positions with colors in order to estimate the location of the signal.

A digital spectrum analysis method for multi-channel direction finding in a digital spectrum analysis apparatus including multi-channel unit having multi-channels of which the number is equal to or less than that of the antennas, the digital spectrum analysis method comprising:

• performing a sequential switching to receive signals from the antennas when the number of the channels is smaller than that of the antennas;
• converting the signals inputted from the antennas into digital signals, reducing a sampling rate of the digital signal by converting the digital signals into baseband signals through a digital down converter (DDC), and converting the baseband signals into complex digital data;
• converting time-domain samples for the complex digital data into a frequency domain;
• estimating the direction of the signal based on a predetermined direction finding method;
• mapping the processed data into a complex waveform image map memory, and allocating different colors to the data depending on the accumulation ratio of one of bearings and power levels of the complex digital data;
• and
• displaying power levels or bearings with colors in order to estimate the bearing of the signal.

A digital spectrum analysis method for location in a digital spectrum analysis apparatus, comprising:

• converting signals inputted from antennas into digital signals, reducing a sampling rate of the digital signals by converting the digital signals into baseband signals through a digital down converter (DDC), and converting the baseband signals into complex digital data;
• estimating position of the signal using a predetermined location method;
• mapping the positions into a complex waveform image map memory, and allocating different colors to the positions depending on the accumulation ratio of the position;
• and
• displaying the positions with colors in order to estimate the location of the signal.