aperture2swath

Swath extent for radar on ground plane

Since R2021a

Syntax

[swlen,swwidth] = aperture2swath(r,lambda,d,grazang)

Description

[swlen,swwidth] = aperture2swath(r,lambda,d,grazang) returns the swath length and width for a radar system at its maximum extent, assuming a flat Earth.

Examples

Swath Length and Width

Estimate the maximum swath length and width of side-looking airborne synthetic aperture radar (SAR) operating at 16.7 GHz for a target range of 10 km. The radar has an aperture length of 3 m in the elevation dimension and of 4 m in the azimuth dimension. Assume a nominal grazing angle of ${30}^{\circ }$.

lambda = freq2wavelen(16.7e9);
R = 10e3;

elaz = [3 4];

grazang = 30;

Compute the swath length and the swath width.

[swl,swwid] = aperture2swath(R,lambda,elaz,grazang)

swl = 
119.6776

swwid = 
44.8791

Input Arguments

r — Range from target to antenna

positive real scalar | vector

Range from target to antenna in meters, specified as a positive real scalar or a vector.

Data Types: double

lambda — Radar wavelength

positive real scalar | vector

Radar wavelength in meters, specified as a positive real scalar or a vector.

Data Types: double

d — Antenna dimensions

positive real scalar | 1-by-2 row vector

Antenna dimensions in meters, specified as a positive real scalar or a 1-by-2 row vector.

• If you specify d as a two-element vector, the first element of d represents the antenna dimension in elevation and the second element represents the antenna dimension in azimuth.

• If you specify d as a scalar, aperture2swath assumes the antenna has equal elevation and azimuth dimensions.

Data Types: double

grazang — Grazing angle

scalar in the range [0, 90]

Grazing angle in degrees, specified as a scalar in the range [0, 90].

Data Types: double

Output Arguments

swlen, swwidth — Swath length and width

matrices

Swath length and width in meters, returned as matrices.

• The rows of the swath length swlength correspond to the range values in r. The columns of swlength correspond to the wavelength values in lambda.

• The rows of the swath width swwidth correspond to the range values in r. The columns of swwidth correspond to the wavelength values in lambda.

The swath width also corresponds to the azimuth or cross-range resolution of a real aperture antenna.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2021a