Monitoring signal processing device for use in e.g. radar arranged in ship, has phase correction value and weight coherence integration section for outputting integration output that fulfils process improvement of device

The device (1) has a phase correction value calculating section (10) for retrieving estimated relative speed of a target from a parameter memory (12) and calculating a phase correction value based on the relative speed. A phase correction value and weight coherence integration section (11) executes phase-weighted coherence integration with respect to monitoring values based on the calculated phase correction value, where the monitoring values are equivalent to a coherence integration number. The integration section outputs an integration output that fulfils process improvement of the device.