As the core of a digital phased array radar system, a radar signal processing environment is created to measure multi-target range and velocity information. The radar echo signal is achieved by superposing target echo, noise, clutter and jamming signals linearly. Considering that these signals have many types, two typical combinations are selected to construct the multi-target echo signal and the simulated echo signal is used as the input of the signal processing environment. This environment mainly adopts pulse compression, moving target indication and detection technologies to process the echo signal. It is found that the frequency domain method is more desirable for the pulse compression effect than the time domain method, and multi-target range information can be measured from the moving target indication result after using a double delay canceller. A new moving target detecting method is proposed, which can present the positive and negative velocity accurately with the multi-target range and velocity measured simultaneously. Simulation results indicate that the potential targets are detected from the chaotic radar echo signals successfully, and their range and velocity can be figured out correctly in the built radar signal processing environment.