Radar by DJ5HG
Two radar types are implemented in PCradar: the chirp radar and the code radar.
Both radars are low-bandwidth radars with a bandwidth of 2 kHz.
Usual SSB-equipment is used as the transmitting and receiving hardware.
These radars are continuously tranmitting.
Therefore, different antennas at sufficient distance from each other must be used for the transmitter and the receiver.
The chirp radar transmits a sinewave with linearly increasing frequency.
The popagation delay of a backscattered signal causes a frequency shift between this received signal and the actual chirp frequency.
The frequency difference is proportional to the distance of the scattering target.
The code radar transmits a binary Hadamard code with 2000 bits/s in phase modulation.
The received signal is correlated with the transmitted signal to get the propagation delay.
If a target is in motion compared to the tx/rx-station, the scattered signal shows a Doppler-shift.
This Doppler shift is mis-interpreted by the chirp radar while the code radar does not see such signals at all,
if the Doppler shift is larger than about 5 Hz.
Download PCradar.zip (5 MB, includes the PCradar UserGuide)
Download PCradar UserGuide (200 kB, includes the PCradar UserGuide)
see also the PCsonar Page
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