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US 2003/0156056 A1Published application
Near-vertical incidence hf radar
AssigneeAlenia Marconi Systems Limited
InventorKenneth H Perry
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AssigneeAlenia Marconi Systems Limited
InventorKenneth H Perry
Estimating the term…
An HF radar system comprises a transmitting system, a receiving system, a signal processing system and a frequency management/ionospheric sounding system. The transmitting system comprises a transmitting antenna array configured to transmit a beam in a near vertical direction and a transmitting device arranged to drive the transmitting antenna array at frequencies suitable for downward refraction by the ionosphere. The receiving system comprises a receiving antenna array configured to receive returning signals from a target area returning to the receiving antenna array via refraction at the ionosphere. The signal processing system comprises a digital data processing system. The frequency management/sounding system comprises cooperating transmitting and receiving systems sending H-F signals to the ionosphere and analysing the returning signals. Alternatively, the system may have a duplexed antenna array. The receiving system includes means to discriminate the returning signal produced by a helicopter, other aircraft or surface vessels.
An HF radar system comprising a transmitting system, a receiving system, a signal processing system and a frequency management/ionospheric sounding system;
An HF radar system comprising a duplexed antenna array, a transmitting system, a receiving system, a signal processing system and a frequency management/ionospheric sounding system;
An HF radar system as claimed in any preceding claim, wherein the signal processing system comprises a discriminator to provide discrimination of characteristic returns from a target.
An HF radar system as claimed in any preceding claim, further comprising means for displaying the processed signals.
An HF radar system as claimed in any preceding claim, wherein the frequency management/sounding system provides information regarding the height of the refracting ionosphere layer above the earth, the area distribution of the layer and the optimum frequencies for the 2-way signal path and controls the transmission frequency at a current optimum frequency.
An HF radar system as claimed in any preceding claim, wherein the frequency management/sounding system comprises the transmitting system, receiving system and signal processing system used on a time-shared basis.
An HF radar system as claimed in any preceding claim, wherein the target area is an annular area having an inner radius of 20 Km approximately and an outer radius of 150 Km approximately.
An HF radar system substantially as hereinbefore described, with reference to and as illustrated in FIG. 3 or FIG. 4 of the accompanying drawings.
Dependencies are inferred from the claim text.