Join us in deploying a dense network of dual-mission HF radars costing $300/node. PiRadar costs 95% less than contemporary radar nodes using the latest COTS SDR technology. PiRadar simultaneously:

A simplified system using one antenna for transmit & receive is shown below. Also shown in this figure is a means to inject 1PPS directly into transmit and receive RF streams, in case there is an issue with hardware triggering of DAC or ADC–applicable to general receivers such as RTL-SDR. In this diagram, maximum 20 dBm transmit power is assumed.

PiRadar node array under ionosphere PiRadar block diagram PiRadar TX/RX Pulse, single antenna block diagram
Ionospheric high-resolution software defined radar: PiRadar.

PiRadar Specifications

PiRadar performance metric value
range resolution 1..25 km
data rate 1..20 kbps
transmit power 1..100 mW
transmit bandwidth 6 kHz..1 MHz
node-to-node communication range (skywave) 50..500 km

Prior Art

Tiddbit CW HF oblique sounder works in the 2..10 MHz range, transmit power ~ 100 watts.