two_rays_flatearth

pylayers.antprop.loss.two_rays_flatearth(fGHz, **kwargs)

p0transmitter position

(3 x Np1) array or (2,) array

p1receiver position

(3 x Np2) array or (2,) array

OR :

ddistance between Tx and Rx

(Np1,)

ht : Tx height hr : Rx height

(Np1)

GtdBfloat (0)

Transmitter Antenna Gain (dB)

GrdBfloat(0)

Receiver Antenna Gain (dB)

fGHzfloat (2.4)

frequency (GHz)

gammacomplex (-1.+0.j)

Reflexion coeff

dBboolean (True)

return result in d

P :

received power

>>> from pylayers.antprop.loss import *
>>> NPT=10000
>>> x=np.array([0,0,8])
>>> x=x.reshape(3,1)
>>> y = np.ones((3,NPT))
>>> y[0,:]=0
>>> y[1,:]=np.arange(NPT)
>>> y[2,:]=2
>>> g0=1
>>> g1=1
>>> fGHz=2.4
>>> PL2R=two_rays_flatearth(p0=x,p1=y,fGHz=fGHz,GtdB=g0,GrdB=g1)
>>> PL1R = PL(fGHz,x,y,2)
>>> plt.semilogx(PL2R,label='two-ray model')
>>> plt.semilogx(-PL1R[0,:],label='one slope model')
>>> plt.axis([10,NPT,-150,-50])
>>> plt.title('Loss 2-rays model vs one slope model')
>>> plt.xlabel('distance (m)')
>>> plt.ylabel('Loss Pr/Pt (dB)')
>>> plt.legend()
>>> plt.show()

(Source code, png, hires.png, pdf)

>>> d=np.arange(1,1000)
>>> PL2Rd = two_rays_flatearth(d=d,ht=np.array([5]),hr=np.array([10]),fGHz=fGHz,GtdB=g0,GrdB=g1)
>>> plt.semilogx(PL2Rd,label='two-ray model')
>>> plt.semilogx(-PL1R[0,:],label='one slope model')
>>> plt.axis([10,NPT,-150,-50])
>>> plt.title('Loss 2-rays model vs one slope model')
>>> plt.xlabel('distance (m)')
>>> plt.ylabel('Loss Pr/Pt (dB)')
>>> plt.legend()
>>> plt.show()

(png, hires.png, pdf)

https://en.wikipedia.org/wiki/Two-ray_ground-reflection_model#As_a_case_of_log_distance_path_loss_model http://morse.colorado.edu/~tlen5510/text/classwebch3.html#x15-590003.3.3