Frequency Domain Anti-Jamming Based On Symmetric Cancellation Consecutive Mean Excision For Power-Enhanced Signal Gnss Receiver

Current navigation signal is so weak to be submerged under flat thermal noise floor. Thus, frequency domain anti-jamming (FDAJ) methods adopted by most of current receivers often set single threshold in whole frequency domain to detect and suppress interference. However, to improve antijamming performance, global navigation satellite systems (GNSS) plan to broadcast higher powered navigation signal for receivers. Besides, power of navigation signal broadcasted in operation control system (OCX) of GNSS may be higher than noise power. Therein, navigation signal can't be ignored. Some spectral lines of navigation signal may exceed noise floor, which will interfere with detection of interference. Thus, current FDAJ methods based on single threshold will malfunction. To solve the problem, a FDAJ based on a threshold setting strategy called symmetric cancellation based consecutive mean excision (SCCME) is proposed. The SCCME firstly utilizes symmetry of navigation signal power spectrum to cancel itself. Then, CME is applied to generate threshold for interference detection. Effectiveness of the proposed FDAJ based on SCCME is verified by simulation. When JNR is 24dB, interference detection ratio (BDR) of the proposed FDAJ approximates to 100%. However, BDR of LAD-ACC can reach 100% when JNR is up to 32dB. BDR of BCME and FCME can reach 96% when JNR is up to 40dB.