Heavy Transport
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 207; Flight Crew Total 5160; Flight Crew Type 1397
Situational Awareness; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Inflight Event / Encounter Unstabilized Approach
Flight Crew Overcame Equipment Problem
Aircraft; Airspace Structure; Procedure; Environment - Non Weather Related
Near the entry to the TLV FIR enroute SOLIS intersection for the Gefin 1C STAR;  EICAS FOR ADS B L OUT; later received EICAS GPS R I assumed it was part of the Israeli security measures. The ADS EICAS kept returning after completing the non-normal checklist; it was distracting during a busy time. I noticed that the course deviation indicator on the PFD had turned amber; with RNP 1.0 ANP 1.2 displayed. I advised ATC that ANP was 1.25; and asked them to monitor our position. I advised ATC that ANP was now 1.5; and asked them for radar vectors. The aircraft ahead of us had not reported any problems; but when Approach Control handed them off to Tower; they advise the Approach Controller that radar factors would be recommended. ATC vectored us very tight on to the localizer; barely outside of the final approach fix. The auto pilot captured the localizer and S turned through the localizer before stabilizing. Altitude capture occurred at 3;400 feet the final approach fix altitude; before glide slope capture. We reached almost a dot high on the glide slope; then set altitude to 200 feet field elevation and selectived vertical speed -1000  to capture the glideslope. Conditions were CAVOC; with the runway in sight; it was still daylight; but the approach and runway lights were on; appearing to be full bright. We met our requirements for the 1;500; 1;000; and 500 foot gates with a normal landing.
First Officer reported experiencing navigation and approach guidance problems due to GPS signal disruption.