Range FFT

 

 

 

 

 

 

 

 

1. Configuration

 

Parameter	Sub-Parameter	Option	Rec. Value	Description
1DFFT Cmpt. Size		64, 128, 256		FFT size
1DFFT Win	Start			Window start index
1DFFT Win	Length			Window length
Window Function		Hamming, Hanning, Blackman		Window function type
1DFFT Col	Offset			Column offset
1DFFT Col	Num			Number of columns
1DFFT Row	Offset			Row offset
1DFFT Row	Num			Number of rows
Range Gate Num				Number of range gates
Gate Range				Gate range
Min Target Energy				Minimum target energy (filter)

 

 

 

 

 

 

2. Output Data

When Range FFT data SPI output mode is selected by chip configuration command,

the chip will transmit Range FFT data, The data communication SPI operates in 32-bit format.

 

The data frame starts with the header Dword (32 bits); then all the FFT data is sent out, 

with the high 16 bits represent real part of the FFT data, and the low 16 bits represent imaginary part of the FFT data;

finally, the tail Dword (32 bits) will valid the checksum and terminate the data output.

 

The output is MSB first and the Range FFT data type is signed integer.

 

ICL1112/ICL111A

Format	Field	Dword	Bit Range	Description
Header	Fixed Pattern	Dword 0	[31:24]	1010 1010
Header	Reserved	Dword 0	[23]	0
Header	Fixed Pattern	Dword 0	[22:20]	11
Header	FFT_chirp_index	Dword 0	[19:11]	Frame 내 chirp 순번 (0부터 시작)
Header	CFG_FFT_TX_MAX	Dword 0	[10:0]	FFT 출력 포인트 수 m + 1
Data	FFT_real_data[0]	Dword 1	[31:16]	Range FFT real part (signed)
Data	FFT_imag_data[0]	Dword 1	[15:0]	Range FFT imaginary part (signed)
Data	FFT_real_data[1]	Dword 2	[31:16]	Range FFT real part (signed)
Data	FFT_imag_data[1]	Dword 2	[15:0]	Range FFT imaginary part (signed)
Data	FFT_real_data[n]	Dword …	[31:16]	Range FFT real part (signed)
Data	FFT_imag_data[n]	Dword …	[15:0]	Range FFT imaginary part (signed)
Data	FFT_real_data[m-1]	Dword m	[31:16]	Range FFT real part (signed)
Data	FFT_imag_data[m-1]	Dword m	[15:0]	Range FFT imaginary part (signed)
Tail	Check_sum	Dword m+1	[31:16]	해당 chirp의 데이터 합 (low 16bit sum 결과)
Tail	FFT_FRAME_INDEX	Dword m+1	[15:12]	Frame counter (0부터 시작)
Tail	Reserved	Dword m+1	[11:10]	0
Tail	CFG_MSG	Dword m+1	[9:8]	User defined bits
Tail	Fixed Pattern	Dword m+1	[7:0]	0101 0101

 

 

 

ICL1122

 

 

 

 

 

 

 

 

3. RD Map

By visualizing target range and velocity simultaneously in the 2D domain,

it enables intuitive identification and analysis of target position and motion characteristics.