Summarizing https://www.gpsworld.com/anti-jam-technology-demystifying-the-crpa/

Here's my try:

Anti-jam technology has been developed to protect GPS receivers from interference and jamming. This includes controlled reception pattern antennas (CRPAs), adaptive antennas, null-steering antennas, beamforming antennas, gradient descent algorithms such as least mean squares (LMS) for optimum weights in beamforming, and the ADAP product which entered service in 2006 and introduced a number of advanced features. The article provides a brief history of how these technologies were developed in response to electronic warfare tactics used during the Cold War era. It also explains how to use gradient descent algorithms such as LMS to solve the Wiener equation for optimum weights in beamforming.

Michael Jones is well-known for his work on GPS anti-jam technology and has made significant contributions to the field of navigation warfare. He has published numerous papers on GNSS interference countermeasures and currently works on robust GNSS receiver design and true anti-spoof technology. In addition, he leads a portfolio of other advanced military navigation technologies, including visual odometry for dismounted soldiers, inertial navigation, signals-of-opportunity, ephemeris prediction, and advanced signal processing techniques.