Navico Holding As

Roger Phillips

Lindsay Lilburn

Gregor Storz

Ee Chen

Jayme J Caspall

Barry M Antao

Robert Stephen Mowbray

Andrew Corbett

Graeme Bell

An example sonar transducer assembly is provided including at least one transducer element and a flexible printed circuit board (PCB) including at least one set of electrical connections for the at least one transducer element. The electrical connections include flex tabs configured to flex out of a PCB plane. The sonar transducer assembly also includes a support structure including an aperture for the at least one transducer element. The support structure is configured to support the body of the PCB, allow flexion of the flex tabs into the aperture, and retain the at least one transducer element in the at least one aperture. The transducer element is installed in a direction that is perpendicular to the PCB plane causing the flex tabs to flex outwardly from the PCB plane, thereby creating an elastic force of the flex tabs applied against opposing ends of the at least one transducer element.

Sonar transducer assembly having a printed circuit board with flexible element tabs

A system, computer-readable medium, and method for receiving reflected signals. In one implementation, the system includes a receiver, a pulse compressor, a framer, and a frame generator. The receiver receives the reflected signals. The pulse compressor compresses the reflected signals and the framer interprets the reflected signals. The frame generator combines one or more modified frames associated with the reflected signals.

Combining Reflected Signals

Various implementations described herein are directed to frequency correction for pulse compression radar. In one implementation, a method may include generating a first transmission signal using a pulse compression radar system based on an ideal waveform signal. The method may also include measuring a frequency of the first transmission signal at an output of a transmitter module. The method may further include comparing the measured frequency of the first transmission signal and a frequency of the ideal waveform signal. The method may additionally include generating pre-distortion coefficients based on the comparison, where the pre-distortion coefficients are configured to compensate for a difference between the measured frequency of the first transmission signal and the frequency of the ideal waveform signal. In addition, the method may include generating a compensated transmission signal using the pulse compression radar system based on the pre-distortion coefficients and the ideal waveform signal.

Frequency correction for pulse compression radar

Various implementations described herein are directed to multiple ranges for pulse compression radar. In one implementation, a method may include transmitting a first burst for a first range using a pulse compression radar system, where the first burst comprises one or more first pulse signals. The method may also include transmitting a second burst for a second range using the pulse compression radar system after transmitting the first burst, where the second burst comprises one or more second pulse signals. The method may further include repeating a transmission of the first burst using the pulse compression radar system after transmitting the second burst.

Multiple ranges for pulse compression radar

Various implementations described herein are directed to a common burst for pulse compression radar. In one implementation, a method may include determining a first burst for a first range using a pulse compression radar system, where the first burst comprises one or more first transmission frames. The method may also include determining a second burst for a second range using the pulse compression radar system, where the second burst comprises one or more second transmission frames. The method may further include transmitting a common burst for the first range and the second range using the pulse compression radar system, where the common burst includes the one or more first transmission frames and the one or more second transmission frames.

Common burst for pulse compression radar

Various implementations described herein are directed to adaptive frequency correction for pulse compression radar. In one implementation, a method may include generating a first transmission signal using a first direct digital synthesizer of a pulse compression radar system based on frequency sweep coefficients. The method may also include comparing a frequency of the first transmission signal at a feedback loop of a phase locked loop circuit and a frequency of an ideal waveform signal. The method may further include generating adaptive frequency coefficients based on the comparison, where the adaptive frequency coefficients are configured to compensate for a difference between the frequency of the first transmission signal at the feedback loop and the frequency of the ideal waveform signal. The method may additionally include generating a compensated transmission signal using the pulse compression radar system based on the adaptive frequency coefficients and the frequency sweep coefficients.

Adaptive frequency correction for pulse compression radar

A system that has a chirp generator for emitting signals and an amplitude modulator for shaping the signals emitted by the chirp generator. The signals are shaped using a calibration ramp. The system further includes a Radio Frequency (RF) power amplifier for amplifying the signals shaped by the amplitude modulator, an RF power detector for measuring power levels of the signals amplified by the RF power amplifier, and a pre-distortion coefficient generator for adjusting the measured power levels using power detector calibration coefficients that correspond to the RF power detector.

Amplitude envelope correction

A system, apparatus, and method for receiving a signal. In one implementation, the system includes a receiver, a correlator, and a range sidelobe envelope generator. The receiver receives the signal. The correlator compresses the signal with a reference signal. The range sidelobe envelope generator generates a range sidelobe envelope function based on the compressed signal.

Range sidelobe suppression

An FMCW radar system includes received signal processing arranged to apply multiple window functions in parallel to a received beat signal including at least one window function having a narrower main-lobe in its frequency response than at least one other window function and said at least one other window function having relatively higher side-lobe attenuation in its frequency response, transform the output of the multiple window functions from the time domain to the frequency domain, and combine the outputs of the transforms for further processing. Both narrow frequency resolution and thus good range discrimination, and also good side-lobe attenuation to avoid close interference are achieved.

Signal processing system and method

Sidelobe suppression methods and systems for use in processing radar video streams generated by rotational radar antenna scanners. The sidelobe suppression methods function in parallel with traditional Sensitivity Control (SC) processing by selectively reducing sensitivity where necessary depending on sidelobe suppression schemes that can be either directional, omni-directional (non-directional), or a combination of these.

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Auckland, New Zealand

Roger Phillips