Patent ID: 8149167

Claim:
A system for removing channel phase error in a phase comparison direction finder, which comprises: a pulse description word (PDW) generator which measures characteristics of signal input into the electronic support (ES) receiver, a direction finder which outputs the angle of arrival (AOA) of the signal input into the ES receiver as a phase difference, a direction finding correction look-up table which stores the phase difference data for use in the calculation of AOA, an AOA generator which calculates and removes the channel phase error by comparing the phase difference output from the direction finder with the phase difference stored in the direction finding correction look-up table, and evaluates the AOA of the signal input into the direction finder, the AOA generator having the function of controlling the built-in test (BIT) equipment, storing the subgroup PDW data on the characteristics of signal measured in the ES receiver and generating BIT equipment control table, and also having memory for storing phase measuring data, and the BIT equipment comprising a local oscillator for transforming the frequency of received signal, and an attenuator for attenuating the power of the signal transmitted to the distributor of the direction finder through the local oscillator.