An Introduction to GPS
EECS 430
University of Michigan
GPS
GPS - Global Positioning System
1) The Space Segment - 24 satellites orbiting the
earth
Orbits every 12 hours
4 Satellites in 6 orbits
55o from the Equator
Altitude 11,000 Nautical Miles
2) The Co

EECS 430, Winter '11
Homework 5 - Due Thursday, 3/25/10 < NOTE: Due Date
1.
(15 pts) The front-end amplifier of a receiver has an input third-order intercept point of
+20 dBm. The primary signal frequency is 1.5 GHz and the receiver is hooked up to an
ant

EECS 430, Winter '11
Homework 6 - Due Thursday, 4/07/11
1. (20 pts) For a GPS receiver,
a) Define what is meant by the terms PDOP, HDOP, and VDOP?
b) You are given HDOP= 4 m and VDOP=8 m, what is PDOP?
c) Why is VDOP generally much worse than HDOP?
d) For

EECS 430, Winter '11
Homework 6 - Due Thursday, 4/07/11
1. (20 pts) For a GPS receiver,
a) Define what is meant by the terms PDOP, HDOP, and VDOP?
b) You are given HDOP= 4 m and VDOP=8 m, what is PDOP?
c) Why is VDOP generally much worse than HDOP?
d) For

Antenna Arrays
EECS 430
University of Michigan
A Special Case
A More General Case
Uniform Separation, Uniform Amplitude,
Different Current Phase
A More General Case (Cont)
The overall array far field is found using superposition.
(Array factor for a unif

EECS 430, Winter '11
Homework 4 - Due TUESDAY, 2010 Feb 22 < NOTE DUE DATE
1.
(20 pts) Consider a TV receiving system. The dish is 2 meters in diameter (assume a 20o
elevation angle above the horizon), frequency is 3 GHz, and bandwidth is 6 MHz. Assume
an

EECS 430, Winter '11
Homework 4 - Due TUESDAY, 2010 Feb 22 < NOTE DUE DATE
1.
(20 pts) Consider a TV receiving system. The dish is 2 meters in diameter (assume a 20o
elevation angle above the horizon), frequency is 3 GHz, and bandwidth is 6 MHz. Assume
an

Radiowave Propagation and Link Design, EECS 430/AOSS 431
Radiowave Link Design
WELCOME!
INSTRUCTOR - BRIAN E. GILCHRIST
UM Positions
Professor, Electrical and Computer Engineering, EECS Department
Professor, Atmospheric, Oceanic, and Space Sci

EECS 430, Winter '11
Homework 5 - Due Thursday, 3/25/10 < NOTE: Due Date
1.
(15 pts) The front-end amplifier of a receiver has an input third-order intercept point of
+20 dBm. The primary signal frequency is 1.5 GHz and the receiver is hooked up to an
ant

EECS 430, Winter '11
Homework 3 SOLUTIONS
PROBLEM 1- (15 pts) A radio that operates at 50MHz has a monopole antenna that is 38-cm long made
of 4-mm diameter aluminum tubing. Compute the radiation efficiency.
Given data:
f = 50 Mhz ;
Therefore, = c/f = 6m

EECS 430, Winter '11
Homework 2 - SOLUTIONS
1. (15 pts) For a small linear current segment, please calculate and make a table showing how
(kr)-1, (kr)-2, and (kr)-3 compare at the transition distances between near-field and intermediatefield zones and bet

An Introduction to RADAR
EECS 430
University of Michigan
Radar
Radar
RADAR - Radio Detection and Ranging
Any active electromagnetic sensor that uses its own source to illuminate a region of
space and then measure the echoes generated by reflecting objects

EECS 430, Winter '11
HW 1 Basics, Radiowave Link, and Communication Example
1.
(10 pts) Decibels and speaking the decibel language You are given 3 different signal
power values below that you are asked to express in decibels using two different
reference

Maxwell Equations
EECS 430 - Radiowave Prop. & Link Design
Brian E. Gilchrist, University of Michigan, Electrical Engineering and Computer Science
Greens Theorem/Stokes Theorem
EECS 430 - Radiowave Prop. & Link Design
Brian E. Gilchrist, University o

An Introduction to Radio Receivers
EECS 430
University of Michigan
Typical Receiver Parameters
Noise Figure
Min Detectable Signal (MDS) threshold
Sensitivity
Dynamic Range
Spurious Outputs
Desensitization
Reciprocal Mixing
Selectivity
Radio Receiver Figur

EECS 430, Winter '11
Homework 3 - Due Thursday, 2011 Feb 10
1. (15 pts) A radio that operates at 50 MHz has a monopole antenna that is 38-cm long
made of 4-mm diameter aluminum tubing. Compute the radiation efficiency.
2. (15 pts) The instantaneous electr

EECS 430, Winter '11
Homework 2 - Due Thursday, 2011 February 3
1.
(15 pts) For a small linear current segment, please calculate and make a table showing
how (kr)-1, (kr)-2, and (kr)-3 compare at the transition distances between near-field and
intermediat

EECS 430, Winter '11
HW 1 Basics, Radiowave Link, and Communication Example
1.
(10 pts) Decibels and speaking the decibel language You are given 3 different signal
power values below that you are asked to express in decibels using two different
reference

Cellular coverage
In practice, unless we live somewhere flat without any
buildings or vegetation we do not get nice circular cells
Typically mobile antennas are low
The propagation path is frequently not line of sight
Blockage by buildings
Blockage by veg