Three pieces of strong ionospheric clutter exist in Figure 3(c), which makes the target in this area difficulty to be detected if the target echo
is weaker than the echo of ionospheric clutter.
This measurement is indirect, given that the target echo
signal is processed digitally, which is used to calculate each parameter mentioned.
(4) if the simulation curve C coincides with the range migration line of the strong point; break; end if end while (5) Remove the target echo
of range cells of the nearest slant range location in frequency domain.
Compared with ambient noise and reverberation has its unique characteristics, one of the most important, the reverberation is caused by the emission signal, and has close relation with the environment, and the waveguide, therefore spectral properties of the reverberation and the target echo
signal under the condition of the Doppler frequency shift is correlation is very strong, and present a strong non-stationarity.
The outputs are provided from a range of signature detection capabilities including underwater radiated noise; radar cross section; target echo
strength; and electromagnetics supported by an extensive range of facilities, equipment and software delivered by highly skilled and knowledgeable engineers.
Since the receivers are close to the target, the target echo
is relatively stronger which can improve the detection probability.
A secondary data set [z.sub.k] (k = K + 1, ..., K + R) without any useful target echo
is also collected, including pure clutter with the same statistical properties as the primary data.
In surveillance radars, a single irradiation time towards a target is very short (often 20 to 30 ms), so the target echo
series is a sub-series of the long echo series obtained in the beam-park mode.
The four boats--Torbay (SSN16), Trenchant (SSN17), Talent (SSN 18) and Triumph (SSN19)--will get the new Thales Underwater Systems Type 2076 integrated sonar suite, a remodelled 'open' command deck, a high-bandwidth fibre optic Tactical Weapon System Data Highway, a new command and fire control system and a range of measures to reduce radiated noise and minimise target echo
The Chameleon ECM simulator is a digital, radio frequency, memory-based, real-lime device that produces jamming techniques and real target echo
stimuli for target radars.