Ubiquitous radar receiver generates multi-beam at the same time to monitor the area designated. It can use long-time coherent integration method to improve target detection performance. However, the crossing-beam, crossing range-cell and crossing Doppler-cell problem in long time must be solved to avoid the integration loss. A moving compensation method based on Keystone transform and Dechirping was researched in the case the crossing-beam impact can be neglected. A detecting flow for multiple targets using the Clean method was proposed. The method proposed in this paper was verified by the simulating data and the outfield experimental data processing. Results show that it can be used for target detection of ubiquitous radar.