Radar Testing Procedures: RF Accuracy & Compliance

The DPX spectrum display with 292,000 individual spectra per second has (for this 100 µs pulse width and 120 µs pulse period) at least six spectrum measurements per pulse with no gaps. The SignalVu vector signal analysis software uses the digitized voltage waveform stored in the oscilloscope and uses the same software as the RSA Series to make all of the RF measurements. All the measurements made in the RSA5000 and RSA7100 rely on getting signals which have passed through an IF frequency converter system. Just like the RSA, the pulse measurements are performed on data in the acquisition memory on a continuous capture/ analyze cycle, or on waveforms stored on the instrument hard disk drive.

Verify your radar performance and identify jamming vulnerabilities

Radar target simulators have a signal generation module that generates radar signals that simulate the interaction between the radar system and the target. ARES simplifies radar testing with a user-friendly JETS software interface, empowering engineers and scientists to effortlessly configure and reprogram targets and flight environments in minutes. That represents where the trigger found the signal, and the spectrum plot displays the frequencies present at that time. Some signals may exhibit transient behavior in both the time and frequency domains simultaneously. These measurement results can be further processed to display trends and analyze these trends. The Advanced Signal Analysis suite, Option 20, includes the pulse measurement capability. Of course, the bandwidth and acquisition speeds are much fast than a turn of the century spectrum analyzer. In addition, several single-frequency pulsed carriers and two continuous wave (CW) interferers can be observed. The x axis represents frequency, the y axis represents time and amplitude is represented by color.

Ensuring radar systems meet performance, compliance, and reliability standards requires a structured testing approach.
This test evaluates how well a radar system resists external RF signals that could interfere with its performance.
To keep up with the growing demands of autonomous vehicles, aerospace, and defense applications, radar testing is evolving.
But to see just one pulse in the amplitude vs. time display in the upper right of the screen, the display has been zoomed to 10.36 µs wide to see just one pulse.
Which the pulse Analysis and the Spectrum analysis will be respectively performed.
The FastAcq feature of the oscilloscope operates on live time-domain data using DPX™ acquisition technology.

Multipurpose modular measurement instruments also offer improved measurement IP, better components (especially analog-to-digital converters and digital-to-analog converters), advances in signal processing, and better software accessibility and architectures. This means you can use the same instrument to perform more types of test by switching between devices like a real-time processor, spectrum monitor, channel simulator, and DUT controller. Test and measurement vendors are investing more in software platforms to run their instruments and earning more revenue as customers quickly choose the flexibility, test speed, and reliability of software over previously manual test systems. The industry trends rapidly changing new radar and EW technology are also making test instrumentation highly adaptable, software driven, and modular to address the need for more modeling and simulation testing. All these systems are producing more data at faster rates with a series of sensors working together to use software to control the systems. The system level encompasses aggregated test structures that need Ringospin parallel testing and high-speed data analysis.

Signal Characteristics

The spectrum plot distinctly shows a peak disturbance at 4 kHz, which is 53 dB below the average value of the amplitude. The effective way to fully analyze the variation is to use the FFT of the trend data from this plot. The horizontal scale is simply the number of the pulse whose amplitude is plotted vertically. At this setting there is very clearly a periodic variation of the pulse amplitude. The Average ON power of the pulse numbers have very small variations showing. With multiple pulses included in one waveform, it is not easy to see differences between the individual pulses.

Radar Simulators Enable Training Without Risk

For the purposes of pulse measurements there is a need for a Gaussian response filter to minimize this overshoot on a pulse. He measurements will have the same dynamic range as the oscilloscope, while maintaining its full bandwidth. The vector signal analysis software can use any of the input channels of the oscilloscope. Some of the measurements are specifically for chirped pulses, including Frequency Deviation, Frequency Error, Phase Deviation and Phase Error.

Troubleshooting Incidental Modulation Example: Wideband chirp using a DPO7000 Series oscilloscope and SignalVu

With the wide array of sensors used, testing at the component level requires more complex I/O analysis. Having high directivity and tighter beams allows the radar to find targets that are further away and smaller. For system-level test, the heavy software suite and integration require further testing with a series of multifunction simulations to ensure the software is ready and able to manage potential error or unexpected inputs.

This combines the extremely wide bandwidth available from, for example, the DPO70000 Series at 33 GHz, with the spectrum analysis and fully automated Pulse Measurement Suite from the RSA Series spectrum analyzers.
Real Time Spectrum Analysis drives to the next level of insight.The advantage of real-time measurement capability is the ability to capture transient events in the frequency domain; real time multi-domain triggering.
The next example is the case of a “scanning monitor receiver”located near a radar installation.
Developing realistic radar simulators is complex.
The main or “A” trigger responds to a set of qualifications that may range from a simple edge transition to a complex logic combination on multiple inputs.
Radar target simulators are pivotal for radar technology development, enabling rigorous testing, training, and validation across diverse applications.

It can simultaneously record radar video, radar tracks, AIS, ADS-B, IFF, and navigation data within a synchronised file structure. RDR Data Recorder provides a robust, multi-channel solution for capturing and replaying a wide array of real-world sensor data. Inadequate testing risks poor performance, regulatory non-compliance, and catastrophic real-world failures. It is also nearly impossible to consistently replicate specific real-world conditions, including variable weather, environmental interference, or unpredictable target behaviour. Field trials are expensive, time-consuming, and carry substantial safety risks, particularly for defence or autonomous systems. Given the complex environments in which these systems operate and their unique advantages in adverse conditions, ensuring their reliability and performance through testing is essential. For this analysis, the analyzer stores a digital acquisition, finds the pulses within it and measures a full set of parameters for each pulse. The continuous non-interrupted visibility guarantees 100% probability of intercept of signals or transients as short as 3.7 μs because there is no dead time. Figure 9 is a radar pulse with an interfering carrier sweeping through the pulsed spectrum. The RSA Series enables DPX™ Live RF spectrum display on up to 800 MHz acquisition bandwidth. An alternate method is to visualize this measurement by emulating the anomalies of a cathode ray tube (CRT) common as the display on a spectrum analyzer before the turn of the century. It can display a range of power vs frequency by ‘sweeping’ the LO and the x-axis of display. The fifth-generation jet fighter is a software-driven aircraft made with over 10 million lines of code to control and connect a series of sensors working together so the aircraft can make quicker flight modifications. Radar modeling and target simulation is the only type of test that can be applied throughout the design process. Machine learning and artificial intelligence are allowing the recognition of patterns in data sets larger than any one human could process and making autonomous vehicles possible. Big data processing and exposure to information are enabling companies to optimize logistics and helping doctors make medical advancements. Low-latency processing is creating opportunities for people to interact differently with the world through virtual reality and gesturing technology. Once the main display monitor is ready to accept the next update, the buffer pixels are converted to the different colors that represent the density of hits – blue for very few hits up to red representing many hits. Samples of whatever signal is in the IF are passed to the hardware signal processor without interruption. The DPO/DSA/MSO Series oscilloscopes also utilize DPX technology for voltage vs.time traces. The wideband oscilloscope with an FFT spectrum plot can provide a single view of both in-channel and out-ofchannel emissions. When examining an installed radar system, one important task is to check for emissions that do not help the radar and very well may cause interference. A very subtle disturbance of this radar transmitter has proven easy to analyze.

Antenna Characterization

For this display,blue represents very low-occurrence transients, while red represents parts of the waveform that are constantly recurring. Figure 4 shows just one single pulse that has a narrower pulse width than even hundreds of thousands of correct pulses. The oscilloscope is the fundamental tool for examining varying voltage versus time. Very fast transition times or very short duration (sub-nanosecond or shorter) can be accurately seen on a 70 GHz bandwidth oscilloscope such as the DPO70000SX family. Another important factor is to ensure the instrument has enough bandwidth to capture the rise/fall times correctly. The Doppler effect can also be observed to measure velocity, however it is usually calculated over multiple pulses.