List of Symbols
| αn | Azimuth angle |
| αR | Unit vector along R |
| β | Wave number |
| αβ | Unit vector along the direction of wave propagation |
| del | Differential vector operator |
| ∇ | grad, gradient of a scalar |
| ∇. | div, divergence of a vector |
| ∇× | Curl of a vector |
| . | Dot product |
| δ(t) | Impulse function, dirac delta function |
| h(t) | Impulse response |
| h(t,τ) | Time-variant impulse response |
| H(ω) | Frequency response |
| H(ω,t) | Time-variant frequency response |
| H(ω,ν) | Frequency Doppler function |
| ρ | Charge density |
| ∈ | Permittivity |
| μ | Permeability |
| C | Conductivity |
| D | Electric flux |
| B | Magnetic flux |
| J | Current density |
| f | Frequency, Hz |
| fc | Carrier frequency |
| fH | Gyro-frequency |
| fi | Instantaneous frequency |
| fD | Doppler frequency |
| ϕn | Phase shift with respect to an arbitrary reference |
| I | In-phase |
| Jo | Zero order Bessel function of the first kind |
| ω | Angular frequency, radians/sec |
| β | Wave number |
| λ | Wavelength |
| n | Impedance |
| * | Complex conjugate |
| S | Poynting vector |
| Ω | Ohm |
| δs | Skin depth |
| n | Phase refractive index |
| n′ | Group refractive index |
| N | Refractivity |
| p | Pressure |
| ν | Diffraction coefficient |
| m | Meter |
| No | Single-sided noise power spectrum density |
| S(τ,ν) | Delay Doppler function |
| τ | Time delay variable |
| τg | Group time delay |
| τmax | Maximum time delay |
| Q | Quadrature |
| vec( ) | Vector operator stacking all elements of a matrix column-wise into a single vector, |
| ⊗ | Kronecker product |
| E{} | Expected value |
| T | Transpose |
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