Typical long-range terrestrial navigation systems such as Omega, Changhe II system, and eLoran currently transmit pulse envelope signals. These systems determine distance differences by measuring the time differences of the pulse envelopes and the phase differences of the carriers. However, this signal regime has certain limitations, such as weak anti-interference capabilities and low measurement accuracy. This paper combines the linear frequency modulated pulse signal regime with eLoran signals, utilizing the mature pulse compression technology from the radar field. It proposes a novel eLoran waveform based on linear frequency modulation as an evolutionary signal regime solution for long-range terrestrial navigation systems. Performance analysis is conducted, and through simulation analysis, the superiority of this waveform in terms of anti-interference capabilities and ground-sky wave separation is demonstrated.