Issue link: https://resources.system-analysis.cadence.com/i/1355089
mmWave Automotive Radar and Antenna System Development Using AWR Software 4 www.cadence.com/go/awr As previously mentioned, pulsed radars are also widely used in automotive radar systems. Relative velocity can be deter- mined from consecutive pulses using a coherent transmitter and receiver to measure pulse-to-pulse phase variations containing the Doppler frequency that conveys relative velocity. For a pulsed-Doppler (PD) radar, range is still measured by signal propagation time. To measure both range and relative velocity, the pulse-repetition frequency is an important parameter. There are many tradeoffs to be considered when deciding which architecture and waveform modulation technology delivers the necessary performance while maintaining development and production cost goals. These requirements can be met with AWR VSS software, which is dedicated to RF system design and implementation, offering a toolbox of commonly called-for simulation technologies and radio block/signal processing models, along with support for user-developed coding. AWR VSS software is an RF and wireless communications and radar systems design solution that provides the simulation and detailed modeling of RF and digital signal processing (DSP) components necessary to accurately represent the signal gener- ation, transmission, antenna, T/R switching, clutter, noise, jamming, receiving, signal processing, and channel model design challenges and analysis requirements for today's advanced radar systems. The AWR VSS workspace example in Figure 3 demonstrates a possible ACC radar architecture, modulation scheme, channel modeling and measurement configuration. This workspace includes a pulse-Doppler (PD) radar system design with signal generator, RF transmitter, antenna, clutters, RF receiver, moving target detection (MTD), constant false alarm rate (CFAR) processor, and signal detector for simulation purposes. The chirp signal level is set to 0dBm, PRF = 2kHz, and DUTY = 25%. The target model is defined by the Doppler frequency offset and target distance, and angles of arrival (THETA/PHI) are specified in a data file and vary over time. The Doppler frequency and channel delay were generated to describe the target return signal with different velocities and distance, while the radar clutter model can be included, and the power spectrum can be shaped. In this example, the clutter magnitude distribution was set to Rayleigh and the clutter power spectrum was formed by a Weibull probability distribution. Figure 3: PD radar example