At the heart of the system, an miniaturized S-band radar transmits and receives radar signals in a distance of 10 -50 m. The radar includes the typical components such as Local Oscillator, Driver, Modulator and Power Amplifier and Parabolic Antenna on the transmitter side. On the receiver side it includes the Sensitive Time Constant STC and filters, the Low Noise Amplifier LNA, the Receiver Rx and the Mixer, providing the I and Q signals.
The transmitter can emit very short pulses through the antenna and monitor the reflected pulses. The pulses are reflected of fixed objects (buildings, trees…) and moving objects (cars, people…) which pass the antenna beam. Emission Power, Pulse Width, Filters, as well as the Frequency can be varied.
The IQ signals are AD-converted and digitally processed using a Digital Signal Processor (DSP), data is visualized through the analysis and visualization software by SkyRadar.
The modular design allows for unprecedented didactic possibilities. The students can assemble their own radar system - choosing between pulse and FMCW radar. All along the signal conversion chain, the student can measure. Having assembled the system, students can visualize, manipulate and do experiments on the IQ signals. These include the application of filters (STC, threshold limiter), amplification, etc.
All students have the possibility to access their individual radar interface (FreeScopes), where they can enhance and manipulate the data.
For academic or research purposes, SkyRadar in addition provides a Matlab-based user interface, allowing to develop own filters and to develop additional possibilities of signal manipulation. The system can be extended, e.g., by a programmable s-band signal generator, allowing to create artificial targets and to test the system response in the various GUIs.
The signal conversion chain of the Pulse Radar Module is like in a real operational radar.
Many measurement sockets allow for profound analysis of the signals throughout their conversion with an oscilloscope
(not part of the deliverables).
Figure: The signal conversion chain of the Pulse Radar Module.
|Peak Output Power||Approx. + 36 dBm|
|Pulse Width||20 ns to 500 ns in 10 ns steps|
|Maximum Range with parabolic reflector||more than 300 m|
|Operating Frequency||S-Band, 2.25 GHz to 2.73 GHz|
|PRF||10.04 Hz to 101.73 Hz in 7 discrete steps|
|Burst mode||8 pulses per cycle|
|Dimensions||without antenna: 502 mm x 400 mm x 188 mm|
|Net Weight||15 kg|
|Power Supply||Universal, 100 V to 240 V, 110 W max|
|Antenna Gain||27 dBi|
|Frequency range||2.4 GHz to 2.8 GHz|
|VSWR||Better than 2.0:1|
|Max. power||10 W|
|E-plane 3 dB beamwidth||11° (+- 5°)|
|H-plane 3 dB beamwidth||8° (+- 5°)|
|Dimensions||900 mm x 700 mm|
Table: General operative characteristics of the Antenna