Measured data to verify the detectability for a small target on the sea-surface

Citation Author(s):
Inoh
Choi
Korea Maritime & Ocean University
Submitted by:
Inoh Choi
Last updated:
Thu, 08/04/2022 - 22:14
DOI:
10.21227/bc58-7p27
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Abstract 

Data using X-band radar and small Styrofoam sphere target were mesured. The measurement system transmitted a linear frequency modulation waveform that had initial carrier frequency 9.35 GHz, stepped carrier frequency interval 0.2 MHz, solid state power amplifier (SSPA) power 50 W, bandwidth 5 MHz, polarization of HH, pulse-repetition interval 0.4 ms, pulse-processing interval 16 ms, scan-repetition interval 0.75 s, and scan-processing interval 15 s. To obtain the measurements from the small Styrofoam sphere target in a sea environment, we conducted an experiment on the east shore of Yeongdeok-gun, Gyeongsangbuk-do, South Korea (lat: 34° 24' N, long: 129° 26' E) in two cases: (1) STSS with radius 0.4 m (i.e., RCS = −9 dBsm) at sea state 3 ~ 4 with wave height 1.2 to 2.2 m and wind velocity 6.3 to 13.5 m/s. the STSS had a velocity 0 m/s and was ~ 440 m away from the X-band radar at fixed azimuth direction and grazing angle 3°, so we obtained complex raw data, which were matched-filtered using replicas with different carrier frequencies at each scan.

Instructions: 

1. Data lists

range : 1 X 190 vector of the radial range [m]

t_pulse : 1 X 40 vector of the pulse time [ms]

velocity : 1 X 40 vector of the radial velocity [m/s]

f_carrier : 1 X 20 vector of the stepped carrier frequency [Hz]

t_delay : 1 X 20 vector of the delay time defined by the Fourier relationship with the stepped carrier frequency [s]

R_initial : 1 X 20 vector of the radial initial range [m]

rps : 190 X 40 X 20 complex cube in a (radial range, pulse time, scan time) domain

rvs : 190 X 40 X 20 complex cube in a (radial range, radial velocity, scan time) domain

rvR : 190 X 40 X 20 complex cube in a (radial range, radial velocity, radial initial range) domain

2. Results

    190 X 40 2D absolute and squared matrix in a (radial range, pulse time) domain at the first scan

    190 X 40 2D absolute and squared matrix in a (radial range, radial velocity) domain at the first scan

 

    190 X 40 2D absolute and squared matrix in a (radial range, radial initial range) domain at the target-velocity cell