Dear Hussein Saad ,

I think in order to cancel the intercept signal you have to detect it and that what you want to realize by your software defined radio. So need a software defined radio developing kit that work in the frequency band of the global position systems. You may use the national instrument software defined radio kits which are based on Ettus kits.

For more details please refer to the link:https://www.ni.com/en-lb/shop/hardware/products/software-defined-radio-device-bundles.html

Here I would like to pay your attention that the GPS signals are spread spectrum signals which are primarily more immune against narrow band jamming.

So, may not need extra precautions against the interference.

One must study how far these signals are immune against jamming.

I would like that you refer to the paper in the link which deals with generations

of such signals:Article Design & Simulation of GSM FH Transmitter Using SDR Technology

and

Article Hamza, G.; Zekry, A.; Motawie, I., “Implementation of a comp...

Best wishes