Air carrier Captain reported experiencing GPS jamming departing PEK/ZBAA airport.

Narrative

Location: Departure from Beijing Capital International Airport (PEK)Aircraft: [Aircraft type not specified]Departure Runway: 36RSID: MUGLO 5YEvent DescriptionDuring the departure from PEK on the MUGLO 5Y SID; our aircraft experienced GPS interference shortly after takeoff. The incident unfolded as follows:After making the right turn at waypoint AA155; before reaching LULTA; the 'ADS-B OUT L' EICAS message illuminated.The Captain decided to delay completing the annunciated checklist until passing 10;000 ft. AGL to manage the pilot's workload. During this phase of the flight; there were several communications with departure and numerous altitude assignments in meters.Upon reaching 10;000 ft. AGL; the Pilot Monitoring (PM) executed the checklist upon the Captain's direction; which instructed switching the Transponder to R.After completing this action; a new EICAS message; 'ADS-B OUT R;' appeared; coinciding with the PM's observation of increasing ANP (Actual Navigation Performance).The ANP value peaked at 0.49 before gradually returning to 0.0.ATC received reports of GPS jamming from an air carrier aircraft that was directly in our flight's trail.As the ANP returned to normal (0.0); both EICAS messages cleared.Dispatch was notified of the incident; and all checklists were completed promptly.The flight continued to ZZZ without further incident.AnalysisThis incident bears the hallmarks of a GPS jamming event; which is becoming increasingly common. The simultaneous failure of both ADS-B systems (L and R) and the temporary increase in ANP strongly suggest external interference with the GPS signal.Actions TakenAll required checklists were completed as per standard operating procedures.The incident was reported to company dispatch. I confess that we did not report it to ATC. Upon reflection; I would have reported it to coincide with the other air carrier report of GPS interference. Due to workload management of PM during a critical phase of flight I elected not to add additional tasks to a very busy PM. I selected the Autopilot to reduce the PM workload.