sarkit.crsd.compute_arp_to_rpt_geometry

compute_arp_to_rpt_geometry(xmt, vxmt, rcv, vrcv, pt, ueast, unor, uup)

Compute aperture reference point geometry as in CRSD D&I 8.4.2

Parameters:

xmt(…, 3) array_like

Transmit APC positions with ECEF X, Y, Z components (m) in last dimension

vxmt(…, 3) array_like

Transmit APC velocities with ECEF X, Y, Z components (m/s) in last dimension

rcv(…, 3) array_like

Receive APC positions with ECEF X, Y, Z components (m) in last dimension

vrcv(…, 3) array_like

Receive APC velocities with ECEF X, Y, Z components (m/s) in last dimension

pt(…, 3) array_like

Fixed scene point position with ECEF X, Y, Z components (m) in last dimension.

ueast, unor, uup(…, 3) array_like

Unit vectors for the East, North, Up coordinate frame, respectively, with origin at pt. The basis vectors are in ECEF coordinates with X, Y, Z components (m) in last dimension.

Returns:

dict

Computed ARP to RPT geometry parameters keyed by their names from CRSD D&I:

ARP_COA(…, 3) ndarray

Aperture reference point position with ECEF X, Y, Z components (m) in last dimension

VARP_COA(…, 3) ndarray

Aperture reference point velocity with ECEF X, Y, Z components (m/s) in last dimension

Bistat_Angndarray

Bistatic angle (rad)

Bistat_Ang_Ratendarray

Time-derivative of the bistatic angle (rad/s)

ARP_SideOfTrackstr, or list of str, or list of list of str, or …

Possibly nested list of Side of Track for the scene point relative to the ARP ground track. "L" for left, "R" for right.

R_ARP_RPTndarray

Range (m) from ARP to pt

ARP_Rg_RPTndarray

Ground range (m) to pt

ARP_DCAndarray

Doppler Cone Angle (deg) between VARP_COA and the line-of-sight from ARP_COA to pt

ARP_SQNTndarray

Ground squint angle (deg) to pt

ARP_AZIMndarray

Azimuth angle (deg) to ARP projected into the earth tangent plane

ARP_GRAZndarray

Grazing angle (deg) for the line-of-sight from ARP to pt

ARP_INCDndarray

Incidence angle (deg) for the line-of-sight from ARP to pt

ARP_TWSTndarray

Twist angle (deg) between the earth tangent plane and the bistatic slant plane

ARP_SLOPEndarray

Slope angle (deg) between the bistatic slant plane and the earth tangent plane

ARP_LO_ANGndarray

Layover angle (deg) from north at pt to the layover direction