signals utilizing interferometric techniques by detecting the phase shift magnitudes produced in multiple calibrated delay lines for instance the received rf signal is divided and simultaneously introduced into a non delayed path and a delay line of known length since the delayed and non delayed receiver paths are functions of the input signal frequency conversion of the phase difference signals to video signals provides signals whose amplitudes are related to phase delay these signals typically take the form of sin function which makes amplitude comparisons of the signals determines the numerical value of omega and generates the digital frequency descriptive word by using the above techniques the receiving embedded system is able to calculate and display distance and direction information on the lcd based on the rf signal sent from the power adapter transmitter a programming flow diagram illustrating the programming of said receiving embedded system is provided in fig3 b at the step 42 the receiving embedded system activates the radio frequency rf receiver 42 and at step 44 said receiving embedded system search for rf signal and pin code that is match the one stored in memory module after finding the corresponding rf signal and pin code the receiving embedded system will display distance and direction information on the lcd the receiving embedded system gives.