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Didactical Primary Radar
Figure 1: System components of Didactical Primary Radar
Figure 1: System components of Didactical Primary Radar
The Didactical Primary Radar (DPR) is a component of an interactive teaching system made of Intersoft Electronics (Olen, Belgium) with the collaboration of Köster Systemtechnik GmbH (Iserlohn, Germany)
It is a genuine radar for education and training useable in a class-room too. The DPR transmits in a free frequency band, the so called ISM band (Industry, Science and Medical band), used for standard WLAN too. The DPR is a so called “silent radar” transmitting a phase coded intrapulse modulated signal with very low pulse-power. Nevertheless the radar achieves with help of the pulse compression techniques a sufficient range to demonstrate the principles of radar.
All functions of the radar can be controlled with the user interface on a laptop. The software allows a light-hearted changing of almost all parameters of the radar. It is interesting to observe the effects of changing on the A-Scope or the B-Scope, shown on the display of the laptop. Example given: the duration of the transmitted pulse can be changed step by step between 20 nanoseconds up to a half microsecond. The student can change the receivers bandwidth independent of the radars pulse width observing the signal rounding on the A-scope. So the conjunction of transmitters pulse width and the receivers bandwidth by a well designed radar can be explained intuitively.
The remote controlled radar antenna can turn and tilt manually or with help of a self generated scenario. The radar picture you can follow on the A- or B-scope on the display. While penetrating the walls, this radar works in relatively small class rooms (as you can expect of a WLAN application) too.
Figure 2: The target of the photographer is visible on the B-scope
Figure 2: The target of the photographer is visible on the B-scope
Figure 3: Block diagram of Didactical Primary Radar
Figure 3: Block diagram of Didactical Primary Radar
In field test the radar can be mounted beside a road or railway. On the display you'll see the targets of driving cars (or trains) and even passing pedestrians. Here you can demonstrate the Doppler-dilemma and its blind speeds, and can change the Pulse Repetiton Frequency (PRF) or even the transmitters frequency of the radar observing the effects.
