ECE 4390
HW 1
Due by TUESDAY 2/5/13
1. The average time between false alarms is specified as 30 min and the receiver
bandwidth is 0.4 MHz.
(a) What is the probability of false alarm?
(b) What is the threshold-to-noise power ratio (VT2/o)?
(c) Repeat (a) a
L5: Radar Equation-Pulse Integration-RCSVan Atta-Cosec Antennas
The Radar Equation
Consider an isotropic antenna, fed with transmit power Pt .
The power density, in Watts/m2 , at range r is:
Pt .
1
4r 2
r
The Radar Equation
But any practical antenna will
ECE4390
HW1
Due by Friday, 3.February 2017
1) A radar mounted on an automobile is to be used to determine the distance to a
vehicle traveling directly in front of it. The radar operates at a frequency of 9375
MHz (X-band) with a pulse width of 10 ns. The
2. Radar Basics - 2
ERS-1 Earth Resources Satellite
Terra SAR - X
SEASAT Shuttle SAR Image
Airborne SAR Image of the
Pentagon
source: Sandia Corporation -http/www.sandia.gov !
Stealth aircraft
Radar Equipment Rack
RAN 20 S, radar electronic cabinet includ
ECE4390
Homework 2
Due by: Thursday, 7 March 2013
1. A VHF radar at 220MHz has a maximum unambiguous range of 180nmi.
(a) What is the first blind speed (in knots)?
(b) Repeat for an L-band radar at 1250 MHz.
(c) Repeat for an X-band radar at 9375 MHz.
(d)
Radar (Radio Detection And Ranging) Principle
Most common radar waveform: a series of short-duration rectangular-shaped
pulses modulating a sinewave carrier [pulse train]
Range to the target: determined by the time TR for the radar signal to travel
to t
Integration of Radar Pulses
Scanning radar :
prf fp , antenna beamwidth qB (deg)
scans at a rate of qS o (deg/sec) = qS o /360 (revolutions/sec)
= qS o /6 (revolutions/min) = wr [rpm] for a 360deg rotating antenna
requires qB (deg) / qS o (deg/sec) [sec]
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5: Noise, Clutter and Detection - 1
Contents!
3.1
3.2
3.3
3.4
3.5
Noise and statistics!
Detection against noise!
Clutter and clutter models!
CFAR!
Computer simulation of radar performance!
Noise
x
If you were to look at noise on an!
oscilloscope, you d se