Bistatic ISAR synchronization using direct path signal
AssigneeThe Government of the United States of America, as represented by the Secretary of the Navy
InventorsRaghu Raj, Ronald Lipps
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Abstract
Systems and methods are provided for synchronizing a bistatic inverse synthetic aperture radar (ISAR) imaging radar system using only the signal that travels directly between the transmitter and receiver. In an embodiment, an extracted direct path signal is used as a matched filter reference function. In an embodiment, full pulse compression is used for a matched filter implementation. Embodiments of the present disclosure provide systems and methods for detecting and extracting the direct path signal and using this direct path signal to synchronize the received signal stream in a bistatic ISAR system.
Claims20
A system, comprising:
- a receiver configured to:
- receive a reflected signal from a target, wherein the reflected signal is reflected from a transmitted signal sent by a transmitter towards the target,
- receive a direct path signal from the transmitter as a reference signal, and
- generate a combined signal based on the reflected signal and the reference signal;
- and
- a controller configured to:
- receive the combined signal from the receiver,
- perform initial detection on the combined signal to search the signal for a direct path signal,
- perform initial synchronization on the direct path signal, thereby generating an extracted direct path signal,
- perform continuous synchronization on the extracted direct path signal,
- generate or update an inverse synthetic aperture radar (ISAR) image based on the performed continuous synchronization, thereby generating a synchronized signal, and
- form an ISAR image using the synchronized signal.
A device, comprising:
- a processor;
- and
- a memory storing instructions, that if executed by the processor, causes the processor to perform operations comprising:
- receiving a reflected signal from a target, wherein the reflected signal is reflected from a transmitted signal sent by a transmitter towards the target,
- generating a combined signal based on the reflected signal and a reference signal, and
- performing initial detection on the combined signal to search the signal for a direct path signal,
- performing initial synchronization on the direct path signal, thereby generating an extracted direct path signal,
- performing continuous synchronization on the extracted direct path signal,
- generating or updating, using the controller device, an inverse synthetic aperture radar (ISAR) image, based on the performed continuous synchronization, thereby generating a synchronized signal, and
- forming an ISAR image using the synchronized signal.
A system, comprising:
- a transmitter configured to transmit a signal towards a target;
- and
- a receiver configured to:
- receive a reflected signal from the target, wherein the reflected signal is reflected from the transmitted signal,
- receive a direct path signal from the transmitter as a reference signal,
- generate a combined signal based on the reflected signal and the reference signal,
- perform initial detection on the combined signal to search the signal for a direct path signal,
- perform initial synchronization on the direct path signal, thereby generating an extracted direct path signal,
- perform continuous synchronization on the extracted direct path signal,
- generate or update an inverse synthetic aperture radar (ISAR) image, based on the performed continuous synchronization, thereby generating a synchronized signal, and
- form an ISAR image using the synchronized signal.
Dependencies are inferred from the claim text.