Abstract: In the radar electronic warfare，the enemy's passive detection radar can realize the direction finding and positioning by receiving the jammer signal，threatening the safety of our jammer． Thus a direction-based cross-lo-cation spoofing technique based on Frequency Divers Array (FDA) was put forward． Firstly，the FDA array fac-tor and phase pattern using nonlinear frequency offset were obtained by Euler's formula based on the establishment of the FDA array model． Then the FDA array was used to measure the signal arrival angle β and position x of the virtual transmitter in x-axis of the coordinate． Next，based on the effect of the interferometer's direction-finding de-ception，the deception principle and positioning accuracy of the FDA jammer to the direction-finding cross-positio-ning system were analyzed． The simulation results show that the FDA can well deduct the effect of the interferome-ter in the far field condition by reasonably selecting the carrier frequency，the number of array elements and the
frequency offset． While other parameters are reasonably selected，the higher the direction finding accuracy is，the smaller the positioning blur area is，and the position of the positioning virtual jammer always falls outside the 50% CEP radius．

Key words: frequency diverse array, nonlinear frequency offset, interferometer, direction finding accuracy, angle deception, direction finding cross positioning