Addressing the Challenges of Wideband Radar Signal Generation and Analysis. Marco Vivarelli Digital Sales Specialist

Transcription

1 Addressing the Challenges of Wideband Radar Signal Generation and Analysis Marco Vivarelli Digital Sales Specialist

2 Agenda Challenges of Wideband Signal Generation Challenges of Wideband Signal Analysis Wideband LFM Chirp Radar Example Wideband16QAM Example Summary

3 Currently Available High-Speed AWGs SFDR 1) R&S What could you do if you had something here? ) SFDR across Nyquist range with f out = 150 MHz 2) Bandwidth of a single channel AWG output 4 8 Bandwidth (GHz) 2) 3

4 High-Precision AWG Example: CW Signal Single tone 555 MHz Fs = 7.2 GHz Spurs: < -86 dbc

5 High-Precision AWG Example: Multi-Tone Signal Multi-tone signal with 200 tones, 3 GHz bandwidth Fs = 7.2 GHz with amplitude correction

6 High-Precision AWG Example: Pulsed Radar Pulsed Radar: Linear Chirp spanning 2 GHz. Pulse width: 6 s Fs = 7.2 GHz, with amplitude correction 2 GHz

7 High-Precision AWG Example: Fast Frequency Switching Switching between frequencies in a 2 GHz bandwidth in less than 500 ps Fs = 7.2 GHz, with amplitude correction

8 Agilent M8190A Arbitrary Waveform Generator Precision AWG with DAC resolution of: 14 bit up to 8 GSa/s 12 bit up to 12 GSa/s *) Up to 2 GSa Arbitrary Waveform Memory per channel 5 GHz analog bandwidth per channel 3 selectable output paths: direct DAC, DC *) and AC *) SFDR: -75 dbc typ. (f out = 100 MHz, Fs=7.2 GHz, 14 bit mode) Harmonic distortion: -72 dbc typ. (f out = 100 MHz, Fs=7.2 GHz) Advanced sequencing scenarios define stepping, looping, and conditional jumps of waveforms or waveform sequences *) 2 markers per channel * (do not reduce DAC resolution) * Not available at initial product release

9 Agenda Challenges of Wideband Signal Generation Challenges of Wideband Signal Analysis Wideband LFM Chirp Radar Example Wideband16QAM Example Summary

10 Do You Really Know What the True Performance Is of Your X/Ku/Ka- Band Transmitter??? FPGA/DSP D/A PA??? Lower Bandwidth Oscilloscope External Down-converter Hardware External HW Can Add: LO Phase Noise & Mixer Impairments ISI from RF/IF Filters Amplifier Gain/Phase Distortions

11 Error Vector Magnitude (EVM) Difference between actual measured signal and ideal reference signal

12 Down-converter Phase Noise and Ka- Band Transmitter Example- Mixer Impairments EVM= 7.3% External HW Can Add: LO Phase Noise & Mixer Impairments Is this the Transmitter s Ka-Band Performance?

13 Ka- Band Transmitter Example- Down-converter Phase Noise, Mixer, and Filter Impairments EVM= 9 % External HW Can Add: LO Phase Noise & Mixer Impairments ISI from RF/IF Filters Or Is this the Transmitter s Ka-Band Performance?

14 Ka- Band Transmitter Example- Down-converter Phase Noise, Mixer, Filter & Amplifier Impairments EVM= 11.7 % External HW Can Add: LO Phase Noise & Mixer Impairments ISI from RF/IF Filters Amplifier Gain/Phase Distortions Or Is this the Transmitter s Ka-Band Performance?

15 Measure the True Performance of Your Transmitter Directly with the 90000X 32 GHz Scope X-Series 32 GHz Oscilloscope Actual Transmitter EVM= 4.8 % External HW Can Add: LO Phase Noise & Mixer Impairments ISI from RF/IF Filters Amplifier Gain/Phase Distortions None of the Above Here s the True Transmitter Performance at Ka-Band

16 Ka- Band Transmitter Example- Simulated Case Study with Agilent s SystemVue Simulated Ka-Band Transmitter Simulated Down-Converter

17 Agenda Challenges of Wideband Signal Generation Challenges of Wideband Signal Analysis Wideband LFM Chirp Radar Example Wideband16QAM Example Summary

18 Example of Radar Pulse Measurements- Test Setup Diagram I/Q data via LAN, USB or GPIB Modulation BW up to 2 GHz RF up to 44 GHz 90000X-Series Scope Up to 32 GHz of Bandwidth and 2GSa of Memory M8190A AWG Up to 12 GSa/s in 12 bit mode, 2 GSa memory Up to 8 Gsa/s in 14 bit mode, 1.5 Gsa memory Differential I/Q Signals E8267D, Opt. 016, H18 Modulated RF/ uwave out

19 Picture of Wideband LFM Chirp Radar Test Setup (10 GHz Center Frequency, 2 GHz LFM Chirp)

20 Generate a Multi-Tone Signal

21 Multi-Tone Signal Before Amplitude Correction

22 Amplitude Flatness Correction

23 Multi-Tone Signal After Amplitude Correction

24 Download LFM Chirp Radar Waveform

25 Custom/Proprietary Radar Measurements with MATLAB in the 90000X Signal Processing Path Scope Waveform Custom MATLAB Function MATLAB Applied Trace Perform Additional Scope Measurements

26 Operate on Scope Waveform with Custom MATLAB Function to Extract Pulsed RF Envelope Scope Waveform Custom MATLAB Function MATLAB Applied Trace Perform Additional Scope Measurements Custom MATLAB Function to Calculate RF Pulse Envelope with a Hilbert Transform

27 Display the RF Pulse Envelope Scope Waveform Custom MATLAB Function MATLAB Applied Trace Perform Additional Scope Measurements RF Pulse Envelope Extracted from Custom MATLAB Function

28 Perform Scope Measurements on the RF Envelope Scope Waveform Custom MATLAB Function MATLAB Applied Trace Perform Additional Scope Measurements Pre-Configured Scope Measurements: Pulse Rise Time Pulse Fall Time Pulse Width Overshoot Drop Pre-Configured Scope Measurements on Displayed Envelope Measure RF Pulse Width, Rise Time, Fall Time

29 90000X Wideband LFM Chirp Measurement with VSA

30 90000X Wideband LFM Chirp Measurement with VSA LFM Chirped RF Spectrum Centered at 10 GHz Chirped Phase 2 GHz Log Magnitude Envelope Amplitude vs. Time 1 us 2 GHz Chirped Frequency

31 Using Segmented Memory to Optimize the Number of Radar Pulses Captured with 2 Gsa Memory X Ignore the OFF Part of the Radar Pulse Capture Only the ON Part of the Radar Pulse Resulting Segmented Memory to Optimize the Number of Radar Pulses Captured Segment 1 Segment 2 Segment 3 Segment 4 Segment 5 Segment 6 Segment 7 Segment 8

32 OSA Segmented Capture and Display: Frequency and Phase vs. Time Set Number of Segments to Capture and Acquisition Length per Capture

33 OSA Segmented File Capture Mode- Timing Measurements binary files or.csv files for each segmented are stored in this directory to analyze off-line Set Number of Segments (e.g. 200) Enable Auto-Analyze to Automatically Display Data

34 Select File> Save> Table Data to store.csv file OSA Segmented File Capture Mode- Frequency Measurements Frequency Excursion and Frequency Deviation of Each Pulse

35 OSA Segmented File Capture Mode- Histogram Displays Sort through and view only pulses >1.8GHz frequency deviation and >1 usec pulse width

36 Agenda Challenges of Wideband Signal Generation Challenges of Wideband Signal Analysis Wideband LFM Chirp Radar Example Wideband16QAM Example Summary

37 Picture of Wideband VSA Test Setup- Wideband 16 QAM Example with Analog IQ Modulation using Vector Signal Generator

38 High-Precision AWG Example: Analog IQ Modulation, Fc=10GHz Wideband digital modulation: QAM16, 1.76G Sym/s Fs = 7.2 GHz with amplitude correction EVM=1.17%

39 High-Precision AWG Example: Digital Upconversion, Fc= 1GHz (without PSG RF Sig Gen) Wideband digital modulation: QAM16, 1G Sym/s Fs = 7.2 GHz with amplitude correction EVM=0.89%

40 Analog I/Q modulation vs. digital I/Q up-conversion Conventional I/Q modulation - Analog I and Q signals are generated using an AWG. An I/Q modulator generates the IF or RF signal AWG Memory Memory D/A D/A Analog IQ Modulator ~ X 90 X + Digital upconversion I/Q modulation is performed digitally - either in real-time (in hardware) or up-front in software AWG Memory Memory ~ X 90 X + D/A Mixer / Multiplier / LO X ~ Digital signal Analog signal

41 New Application Notes and Web Demo Video Application Notes: Web Demo Video:

42 MATLAB N6171A Software from Agilent for RADAR Signal Generation and Analysis Generate arbitrary waveforms (multi-tone signals, pulsed radar signals, and multi-carrier modulated waveforms) for the M8190A using MATLAB. Make user-defined measurements (such as pulsed RF envelopes or custom filters) for the Infiniium oscilloscope using MATLAB. Available as an option with both the M8190A Arbitrary Waveform Generator and Infiniium X/90000/9000 Series oscilloscope. MATLAB examples, instrument drivers, and product information available at

43 Summary Enhance your reality: The Agilent M8190A AWG is the source of greater fidelity, delivering high resolution and wide bandwidth -- simultaneously 90000X Oscilloscope Enables You to Directly Measure the True Performance of X, Ku, and Ka-Band Transmitter Outputs -- up to 32 GHz-- Without the Need for External Down-Converter Hardware Perform Frequency and Modulation Domain Measurements with the VSA Software, and Pulse Timing, Frequency, and Amplitude Measurements with the OSA software Leverage COTS AWG and Oscilloscope for Other Applications such as Wide-Bandwidth Communications

44 Thank You!