Radar and method for target detection using radar

A method for target detection, comprising:

• performing data acquisition using a radar device to obtain raw radar echo data arranged in order of an acquisition space;
• wherein during data acquisition, a moving interval of an orbit is defined as an antenna spacing,
• wherein the moving interval of the orbit is set to be less than λ/10, wherein a wavelength is denoted as 2;
• wherein performing data acquisition comprises driving a transmitting antenna by the orbit to move for the moving interval of the orbit from a starting point until the orbit reaches an end point, when the orbit has moved a distance;
• and
• performing focused imaging of a phased array antenna of raw radar echo data, wherein the step of performing the focused imaging comprises:
• performing a Fourier transform of the raw radar echo data to obtain transformed data comprising one or more data arrays converted to a frequency domain;
• performing a delay correction of the one or more data arrays with a set antenna phase delay parameters to obtain corrected radar echo data;
• performing a spatial domain Fourier transform of the corrected radar echo data to obtain second transformed radar echo data;
• and
• determining an actual angle of an azimuth direction represented by the second transformed radar echo data to obtain an image;
• after performing data acquisition to collect data, collected radar echo data is stored as:
• start
• ⁢
• position
• ⁢
• 0
• *
• ⁢
• d
• :
• A
• 1
• ,
• 1
• ,
• A
• 2
• ,
• 1
• ,
• A
• 3
• ,
• 1
• ⁢
• …
• ⁢
• A
• n
• ,
• 1
• ,
• orbit
• ⁢
• position
• ⁢
• 1
• *
• ⁢
• d
• :
• A
• 1
• ,
• 2
• ,
• A
• 2
• ,
• 2
• ,
• A
• 3
• ,
• 2
• ⁢
• …
• ⁢
• A
• n
• ,
• 2
• ,
• orbit
• ⁢
• position
• ⁢
• 2
• *
• ⁢
• d
• :
• A
• 1
• ,
• 3
• ,
• A
• 2
• ,
• 3
• ,
• A
• 3
• ,
• 3
• ⁢
• …
• ⁢
• A
• n
• ,
• 3
• ,
• …
• …
• end
• ⁢
• position
• ⁢
• (
• k
• -
• 1
• )
• *
• ⁢
• d
• =
• a
• :
• A
• 1
• ,
• k
• ,
• A
• 2
• ,
• k
• ,
• A
• 3
• ,
• k
• ⁢
• …
• ⁢
• A
• n
• ,
• k
• ;
• wherein each unit A is an array, the moving interval of the orbit is denoted as d, the antenna spacing is denoted as a, the number of moved steps of the orbit is denoted as k, a number of receiving antennas is denoted as n, the distance the orbit has moved is the antenna spacing;
• wherein a length of the array A is determined by a scanning time t and a sampling rate sp, such that the length of the array A is the product of t and sp;
• wherein elements of the array A are taken out one by one from top to bottom, and then from left to right, starting from the top left corner, A1,1, and the raw radar echo data is reorganized and expanded into one dimension:
• A
• 1
• ,
• 1
• ,
• A
• 1
• ,
• 2
• ,
• A
• 1
• ,
• 3
• ,
• …
• ⁢
• A
• 1
• ,
• k
• ,
• A
• 2
• ,
• 1
• ,
• A
• 2
• ,
• 2
• ,
• A
• 2
• ,
• 3
• ,
• …
• ⁢
• A
• 2
• ,
• k
• ,
• …
• A
• n
• ,
• 1
• ,
• A
• n
• ,
• 2
• ,
• A
• n
• ,
• 3
• ⁢
• …
• ⁢
• A
• n
• ,
• k
• obtaining n*k raw radar echo data arranged in order of the acquisition space with the length of each of the raw radar echo data being t*sp, wherein each element of the array A is a one- dimensional array with a length of t*sp, so:
• A=B(1,2,3,4,5 . . . t*sp);
• wherein in response to each of elements of the array A is expanded to a data array B, the one-dimensional array is the data array B with a length of n*k in the first dimension and t*sp in the second dimension:
• B
• 1
• ,
• 1
• ,
• B
• 1
• ,
• 2
• ,
• B
• 1
• ,
• 3
• ,
• B
• 1
• ,
• 4
• ,
• …
• ⁢
• B
• 1
• ,
• t
• *
• ⁢
• sp
• ,
• B
• 2
• ,
• 1
• ,
• B
• 2
• ,
• 2
• ,
• B
• 2
• ,
• 3
• ,
• B
• 2
• ,
• 4
• ,
• …
• ⁢
• B
• 2
• ,
• t
• *
• ⁢
• sp
• ,
• B
• 3
• ,
• 1
• ,
• B
• 3
• ,
• 2
• ,
• B
• 3
• ,
• 3
• ,
• B
• 3
• ,
• 4
• ,
• …
• ⁢
• B
• 3
• ,
• t
• *
• ⁢
• sp
• ,
• …
• B
• n
• *
• ⁢
• k
• ,
• 1
• ,
• B
• n
• *
• ⁢
• k
• ,
• 2
• ,
• B
• n
• *
• ⁢
• k
• ,
• 3
• ,
• B
• n
• *
• ⁢
• k
• ,
• 4
• ,
• …
• ⁢
• B
• n
• *
• ⁢
• k
• ,
• t
• *
• ⁢
• sp
• wherein this data is equivalent to that obtained with a single receiving antenna orbit radar with an orbit length of a*n, and an observation period is reduced to 1/n of that of a conventional orbit radar.