US 12,449,510 B2
Determination of radar cross sections of objects
Adam Thomas Petrus, Warton (GB)
Assigned to BAE SYSTEMS PLC, London (GB)
Appl. No. 17/796,956
Filed by BAE SYSTEMS PLC, London (GB)
PCT Filed Feb. 9, 2021, PCT No. PCT/GB2021/050287
§ 371(c)(1), (2) Date Aug. 2, 2022,
PCT Pub. No. WO2021/161000, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 20275031 (EP), filed on Feb. 10, 2020; and application No. 2001743 (GB), filed on Feb. 10, 2020.
Prior Publication US 2023/0072805 A1, Mar. 9, 2023
Int. Cl. G01S 7/41 (2006.01); G01S 7/40 (2006.01); G01S 7/02 (2006.01); G01S 7/03 (2006.01); G01S 13/90 (2006.01)
CPC G01S 7/41 (2013.01) [G01S 7/40 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of measuring a radar cross section of an object, the method comprising:
determining a pulse profile, the pulse profile including a pulse frequency and a pulse width;
determining a range walk length, where a number of radar pulses to be transmitted in a sequence of radar pulses is based on the range walk length, where each radar pulse in the sequence has the determined pulse profile,
for each radar pulse in the sequence,
transmitting said radar pulse to the object measuring a pulse return value at a predetermined delay time from the transmitting of said radar pulse, the pulse return value at the predetermined delay time being the pulse return value of the radar pulse reflected by the object at a given distance along the object, where the predetermined delay time for each radar pulse in the sequence of radar pulses is different;
performing a Fourier transform on a normalized value of said radar pulse;
performing a Fourier transform on the measured pulse return value;
dividing the Fourier transform on the measured pulse return value by the Fourier transform on the normalized value of said radar pulse to obtain a divided value; and
performing an inverse Fourier transform on the divided value to determine the radar cross section of the object at a given distance.