TITLE:
A Method to Obtain the Moving Speed of Uncooperative Target Based on Only Two Measurements
AUTHORS:
Tao Yu
KEYWORDS:
Moving Speed, Non-Cooperative Target, Doppler Frequency Shift, Frequency Difference Equation, Azimuth, Steady-State Signal, Passive Location
JOURNAL NAME:
Advances in Aerospace Science and Technology,
Vol.9 No.1,
March
8,
2024
ABSTRACT: The
existing research results show that a fixed single station must conduct three
consecutive frequency shift measurements and obtain the target’s moving speed by
constructing two frequency difference equations. This article proposes a new method that requires
only two consecutive measurements. While using the azimuth measurement to obtain the
angular difference between two radial distances, it also conducts two
consecutive Doppler frequency shift measurements at the same target azimuth. On the basis of this
measurement, a frequency difference equation is first constructed and solved
jointly with the Doppler frequency shift equation. By eliminating the velocity
variable and using the measured angular difference to obtain the target’s lead angle, the target’s velocity can be solved
by using the Doppler frequency shift equation again. The new method avoids the condition that the target
must move equidistantly, which not only provides an achievable method for engineering
applications but also lays a good foundation for further exploring the use of
steady-state signals to achieve passive positioning.