These late arrival echoes can appear when there are strong reflectors located after the maximum range detected by the radar system, namely ambiguity range.
In one sweeping statement, that the press let him get away with, Wells moved the target pressure down as much as 1,500 psi from the 9,000 psi to 7,500, much closer to the 6,700 psi they were holding, which is actually at the lower end of the ambiguity range we talked about on Friday.
As shown in the figure, the usage rate of original WL ambiguities ranges from 57.9 to 100% for individual satellite, and the average usage rate of all satellites is 86.2%.
where L is the range ambiguity degree, N c is the number of clutter patches contributing to the signal, a li and S li are the complex amplitude of the signal and spatial-temporal steering vector corresponding to the i th clutter patch for the l th ambiguous range cell.
Lincoln Laboratory researchers developed a technique to suppress signal interference and eliminate the ambiguity in range measurements that is inherent in pulse-Doppler radar.
The authors in [11] propose a multi-dimensional assignment approach to solve the transmitter ambiguity for bistatic range, range rate, and precise azimuth measurements.
The Doppler image in Fig. 7(b) maps an axial flow velocity within a non-ambiguity velocity range from −10.9 mm/s to + 10.9 mm/s with the velocity sensitivity of about 47 μm/s.
Fig. 1 SAR geometrical imaging configuration with range ambiguity Fig. 2 Range ambiguity configuration Fig. 3 SAR image with range ambiguity Table 1 SAR configuration Parameters Values RF f 0 6 GHz Bandwidth B 20 MHz Pulse duration T p 650 ns PRF 26.92 kHz Range ambiguity 1 km Range resolution δ r 7.5 m Azimuth resolution δ az 0.56 m Ambiguous reflector position (x,y) (1150,0) m.
In [10, 11], the low pulse repetition frequency (PRF) is chosen to avoid range ambiguity which results in Doppler ambiguity, and the approaches are also given to suppress Doppler ambiguity.
In the context of this problem, i.e., the problem of the joint localization of wireless agents and resolution of ambiguities in ranging measurements (the JLTAP), a detailed and thorough derivation and analysis of the underlying graph-theoretical problem has been presented to serve as the basis for solving the problems arising in both application cases.
Note that the adoption of two interrogation tones allows the operation in (25) and (26) from which, due to the periodicity of 2π of the phase estimate, no ambiguities in ranging arise for distances less than (d_{text {max}}=frac {c}{4 Delta f}).
