초록 ▼

Electronic Warfare (EW) systems aboard aircrafts are used to protect them from guided missile by denying threat radar systems the ability to track the aircrafts. In a typical operation, a threat radar system transmits RF signals aimed at the target aircraft. The surface of the target reflects a port

Electronic Warfare (EW) systems aboard aircrafts are used to protect them from guided missile by denying threat radar systems the ability to track the aircrafts. In a typical operation, a threat radar system transmits RF signals aimed at the target aircraft. The surface of the target reflects a portion of the incident signal back towards the threat radar antenna where the reflected signal is detected, allowing the threat radar system to determine the target's range, angle and velocity. The present invention relates to EW systems that are dependent on measuring the RF phase of a signal transmitted by a target tracking threat radar. The use of the invented technique will make it possible to implement a robust Electronic Counter-Measures (ECM) technique, known as Cross-Eye, using two airborne platforms. The technique is very effective in preventing a threat radar from tracking a target aircraft and guiding a launched missile to the target aircraft.

대표청구항 ▼

1. A method of measuring distance between two platforms with high precision, comprising the steps of:determining an estimate of distance D between the two platforms within a first range of error; transmitting an RF signal from a range-only radar located on a first platform; receiving the RF signal t

1. A method of measuring distance between two platforms with high precision, comprising the steps of:determining an estimate of distance D between the two platforms within a first range of error; transmitting an RF signal from a range-only radar located on a first platform; receiving the RF signal transmitted by the range-only radar on the first platform by a repeater located on a second platform; retransmitting the RF signal by the repeater on the second platform; receiving the retransmitted RF signal by the range-only radar located on the first platform; measuring phase difference between the RF signal transmitted by the range-only radar located on the first platform and the RF signal retransmitted by the repeater located on the second platform; converting the measured phase difference to a measure of distance .delta.; and adding the estimate of the distance D to the measure of distance .delta., to obtain a measure of total distance between the two platforms.