Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance and direction
Patent
1995-10-10
1996-10-29
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance and direction
342115, 342140, 342 97, G01S 1372
Patent
active
055700942
ABSTRACT:
A moving target which is reflecting waves will give rise to the well known Doppler frequency shift. When the reflected signal can be compared with the transmitted signal in homodyne detection, the resulting signal is called the Doppler signal. Both frequency and phase of the Doppler signal carry information about the motion of the target.
By observing a Doppler signal at several points in space, it is possible to determine the position, velocity and acceleration of a moving target. Systems employing this principle are-used to track acoustic emitters with sonar, as well as radio emitters with radar. While the prior an has relied on analyzing the Doppler shift frequency, the present invention introduces a method employing the analysis of the phase of the Doppler signal. The phase-based algorithm shows a better signal to noise ratio in applications where the ratio of velocity and distance to the point of closest approach is large. The improved signal to noise ratio translates to lower power and lower cost for Doppler based three dimensional tracking.
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