Single-antenna FM/CW marine radar
First Claim
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1. A radar system comprising:
- a single slotted waveguide antenna;
a circulator in signal communication with the antenna, wherein the circulator comprises only three ports;
a transceiver in signal communication with the antenna, the transceiver comprising;
a receiver mixer connected directly to an output of the circulator;
a component configured to provide a local oscillator signal using a sample of a transmitter signal; and
a component configured to match arrival time of the local oscillator signal with a signal associated with at least one of leakage or reflected power signals, thereby performing phase noise cancellation in the receiver mixer.
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Abstract
A high resolution, low power marine radar for use in applications such as the newly mandated barge/river radars that are to be used in very confined spaces such as canals. An example radar system includes frequency-modulated/continuous-wave (FM/CW) radar that uses very low transmitter power (a fraction of a watt) and has an exceptionally short sensing range of a few feet or even inches if needed.
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Citations
17 Claims
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1. A radar system comprising:
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a single slotted waveguide antenna; a circulator in signal communication with the antenna, wherein the circulator comprises only three ports; a transceiver in signal communication with the antenna, the transceiver comprising; a receiver mixer connected directly to an output of the circulator; a component configured to provide a local oscillator signal using a sample of a transmitter signal; and a component configured to match arrival time of the local oscillator signal with a signal associated with at least one of leakage or reflected power signals, thereby performing phase noise cancellation in the receiver mixer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radar system comprising:
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a single slotted waveguide antenna; a circulator in signal communication with the antenna; a transceiver in signal communication with the antenna, the transceiver comprising; a receiver mixer connected directly to an output of the circulator interface to the transmitter and antenna; a component configured to provide a local oscillator signal using a sample of a transmitter signal; and a component configured to match arrival time of the local oscillator signal with a signal associated with at least one of leakage or reflected power signals, thereby performing phase noise cancellation in the receiver mixer, wherein phase noise of the transceiver is less than −
100 dBc/Hz at an offset of 100 KHz,wherein the transceiver performs triangle wave modulation and continuous transmission and reception, wherein a voltage standing wave ratio (VSWR) of the antenna is less than 1.2;
1 across an operating frequency band.
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Specification