Scanning Digital Radar Receiver

Ryan HamorAdvisor: Dr. HugginsBradley University ECE Department5/02/2006

Presentation Outline

Project Overview Functional Description Detailed System Description Theory of Signal Classification Software Development Simulation Results Experimental Results Future Work

Project Overview

Scanning Digital Radar Receiver

Functional Description

Scanning Digital Radar Receiver

PRR

RF Frequency

PWRadar Signal

Functional Description

PRR = 1/T

PW = τ

System Block Diagram

User Input Mode

RF Signal

PW

PRR

Freq RF

No Signal

(Inputs) (Outputs)

A/D

Freq Oscillator

FilterLO

RF

Control Word

IF

IF Amplifier

LO Amplifier

System Description

RF +LO

RF-LO

Frequency Synthesizer

LO

RF IF

LO Amplifier

Frequency Synthesizer Subsystem

DDS Architecture 0.01 Hz

Resolution DC-300MHz Serial/Parallel

Connections

DDS Theory of Operation

System Description

Frequency Synthesizer

FilterLO

RF IF

IF Amplifier

LO Amplifier

If Filter Subsystem

Low Pass LC Butterworth Filter

-60

-50

-40

-30

-20

-10

0

10 100 1000

Frequency [KHz]

Mag

nit

ud

e [d

B]

3db Point at 200KHz

System Description

A/D

Frequency Synthesizer

FilterLO

RF IF

IF Amplifier

LO Amplifier

A/D Subsystem

1 MHz Sample Rate

16-bit Resolution USB 2.0

Theory of Signal Classification

)()(2

n

nTtAtx

)2cos()(1 Tftx RF

)(2

1)(

2

1)(1 RFRF fffffX

n

πfnT)j(efAfX 2^)(sinc)(2

(FFT)

)()()( 21 fXfXfG

Theory of Signal Classification

-150 -100 -50 0 50 100 150-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

-fC f

C

FRF-FRF

)((sinc RFff )((sinc RFff

1/τ

1/T

1]1

)[( nT

ff RF

2]2

)[( nT

ff RF

n

RFRF

n

RFRFT

nff

Tff

A

T

nff

Tff

AfG ))((

1))((sinc

2))((

1))((sinc

2)(

Software

Graphical User Interface

Frequency Synthesizer Control

Program Flow Control

A/D Initialization Sample Signal Perform Signal

Detection Perform Signal

Processing

Visual Basic Matlab ServerCOM Interface

Top Level Signal Processing Flow Chart

Signal Detected

Take FFT

Find Frequency of IF

Find PRR, Next Maximum Value.

Find PW, Next Zero Crossing

Calculate Next LO Frequency

END

START

YES

NO

Detection Process

Threshold Level

Detect Spikes

Continue Signal Processing

Level 1 Detection

Level 2 Detection

Simulation (Simulink)

Simulation Results

Fc = 100 MHz FLO = 99.9 MHz

PW = 400 uS Pulse Repetition Period = 2 mS

Simulation Results

Experimental Results

PRP = 2 ms PW = 20 % Fc = 100 MHz LO = 99.9 MHz

Experimental Results

Future Work

Use of DSP board Microcontroller

Production System

Questions ?