Issue link: https://resources.system-analysis.cadence.com/i/1355113
Cadence is a pivotal leader in electronic design and computational expertise, using its Intelligent System Design strategy to turn design concepts into reality. Cadence customers are the world's most creative and innovative companies, delivering extraordinary electronic products from chips to boards to systems for the most dynamic market applications. www.cadence.com © 2020 Cadence Design Systems, Inc. All rights reserved worldwide. Cadence, the Cadence logo, and the other Cadence marks found at www.cadence.com/go/trademarks are trademarks or registered trademarks of Cadence Design Systems, Inc. All other trademarks are the property of their respective owners. 14639 06/20 DB/SA/DS-VSS-RDR/PDF Radar Systems with AWR Software Product Strengths RF Modeling Modeling of the RF chains of a radar system is supported through the RFA capability within the AWR VSS software, which uses a frequency-domain engine to provide budget or line-up analysis similar to that available in Microsoft Excel, as well as spurious analysis based on mixer spur tables. The advantage is accuracy and speed as it accounts for impedance mismatch and frequency dependencies. Spurs arising from the mixing process, characterized by mixer IMT tables, can be tracked through the system, and the heritage, order and type of spur (signal, distortion, or interference). Antennas and Phased Arrays Antenna and phased array models are available, as is ASCII file import of antenna patterns containing data versus theta and phi. This data may be obtained from electromagnetic (EM) simulation as well as measurements. The receive antenna can then accept multiple inputs representing wanted signal, clutter, and jammers (all at arbitrary theta and phi). DSP and Detection Target detection cannot be done effectively and realistically in the time domain because small moving targets are hidden by heavily cluttered environments. Instead, detection of the signal occurs in the frequency domain using Doppler frequency analysis. Features Highlights f Element tree supporting signal processing/antenna models f Channel model inclusive of Doppler and clutter f Target models account for radar cross-section (RCS) f Radar signal generators f Signal processing blocks ɢ Moving target indicator (MTI) ɢ Moving target detection (MTD) ɢ Constant false alarm rate (CFAR) f Antenna model ɢ Accept gain pattern ɢ Phased array element Radar Waveforms and Metrics CW Radar Noise and Interference No range detection Thermal background, NF, spurs, group delay CW FM Modulation Beam Width and Range Linear frequency versus time Beat frequency modulator IF-Frequency varies with range Requires separate TX/RX antenna–e.g., aircraft altimeter Line of sight depends on height above ground Maximum unambiguous range (MUR) Radar sensitivity and power of return-radar equation Pulsed Radar Pulsed FM Chirp Range detection Single antenna switch TX to RX using duplexer Min range =PW*C/2, Max range = PRT *C/2 Resolution limited by pulse width Range detection and processing gain Matched filter allows pulse compression Overcomes limited resolution PW~1/BW Provides processing gain against noise-adds to radar equation Clutter Jamming Unwanted targets-ground, sea, atmospherics, buildings Multi-path–moving "ghosts" of valid target Constant False Alarm Rate (CFAR) EW intentional jamming Equipment operating in same band Not governed by radar equation–1-way travel