Table of Contents
Chapter I Introduction??? .1
Radar Measurement Tasks Through the life
cycle of a radar system???? .1
Challenges of Radar Design & Verification???? .1
Challenges of Production Testing??? 2
Signal Monitoring?????? 2
Basic RF Pulsed Radar Signals????? .2
Compressed Pulse signal types and purposes?? .3
Linear FM Chirps?????? 3
Frequency Hopping????? .3
Phase Modulation?????? .4
Digital Modulation?????? 4
Radar Pulse Creation????? .4
Transmitter Tests?????? 4
Receiver Tests????? .4
Chapter II Pulse Generation – Baseband and
RF Modulated Pulses???? .5
Overview??????? .5
Baseband Pulse Generation???? .5
Pulse Modulated RF?????? .6
RF Pulses Directly from an Arbitrary Waveform Generator? .6
Synthesizing Signals Directly in the AWG Series
with RFXpress¤????? .7
The Carrier Parameters???? .7
Adding Impairments??? .7
Adding Interference???? .7
Pulse Envelope Parameters????? .8
The Staggered PRI Tab???? .8
Adding Timing Impairments????? .8
Complex Modulations within the Pulse???? .9
Graphing the Results??? .9
Creating MATLAB? Signals and Importing into the
AWG Series????? 9
Checking the Phase Modulation???? .9
Chapter III Pulse Measurements Methods?? .10
Overview?????? .10
Automated RF Pulse Measurements??? 12
Short Frame Measurements — The Pulse Model?? .12
Sampling the RF?????? .12
Choosing Measurement Parameters??? .12
Measurement Filter Type????? 13
Detection Threshold and Minimum OFF Time?? .13
Maximum Number of Pulses to Measure?? 14
Frequency Estimation Method??? .14
Measurement Point Definitions?? .14
Droop Compensation and Rise/Fall Definitions? .15
50% Level Definitions???? .15
Finding the Pulse?????? .15
Minimum Pulse Width for Detection???? 15
Using the Threshold Setting??? 16
Finding the Pulse Carrier Amplitude?? .17
Method One: Magnitude Histogram??? .18
Method Tw Local Statistics??? 20
Method Three: Moving Average?? .20
Noise Histogram (preparation for method four)?? .21
Method Four: Least Squares Carrier Fit? .21
Locating the Pulse Cardinal Points??? 23
Interpolation????? .24
Estimating the Carrier Frequency?? .24
Constant Phase????? .24
Changing Phase???? 25
Linear Chirp???? .25
Making the Timing Measurements?? .26
Rise Time/Fall Time??? .26
Measurement System Impact on
Rise and Fall times???? .26
Pulse Width???? .28
Repetition Interval/Duty Cycle??? .28
Peak Amplitude????? .28
Average ON Power??? .28
Average Transmit Power????? 28
Droop????? .29
Pulse Top Ripple???? 29