Link-16, an excellent tactical data link developed by US army, provides security and reliable tactical data for aeroamphibious platforms and it's communication terminal, Joint Tactical Information Distribution System (JTIDS), features Reed-Solomon (RS) codes for random error, interlaced codes to for burst error. In the past decades, a variety of new-style electromagnetic weapons are constantly emerging and military communication environment becomes more and more complex and inscrutability, the BER performance of original JTIDS will be difficult to adapt to modern warfare increasingly harsh channel environment. In this paper, we establish a new burst-error channel to simulate the attack of electromagnetic weapons and we find a sharp fall in jam-resistant performance of original JTIDS. Furthermore, a new JTIDS based on LDPC codes over GF(q) which are capacity-approaching codes is proposed for confronting the new channel model.