Dsp amplifiers with sonarca

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Effective date : Year of fee payment : 4. A software defined platform is provided for subsea acoustic applications that utilizes a broadband phased array transducer and a configurable, multi-function software defined transducer that is configurable on the fly to enable various subsea acoustic systems to be achieved in a single unit thus reducing the space required on the vessel and the cost of having such multiple functions.

Provisional Patent Application No. The following relates generally to subsea acoustics and has particular utility in performing multiple acoustic functions using a common software defined platform.

Subsea acoustics technology, e. Traditionally, each subsea acoustic system requires its own fixed software and hardware components as well as its own physical space on the vessel. In addition, each system can cost tens of thousands of dollars to purchase and thus having multiple acoustic systems in a single vessel can become prohibitively expensive, in particular for smaller vessels or non-commercial vessels.

It is an object of the following to address the above-noted disadvantages. It has been found that by utilizing a software defined platform with a broadband phased array transducer, a configurable, multi-function sonar system can be provided to enable various subsea acoustic systems to be achieved in a single configurable unit thus reducing the space required on the vessel and the cost of having such multiple functions.

In another aspect, there is provided a method for dynamically performing one of a plurality of subsea acoustic applications using a common software defined sonar platform, the method comprising: detecting selection of a desired one of the subsea acoustic applications; providing instructions for implementing the desired application; programming at least one programmable device using the instructions to configure a transceiver to control a plurality of channels for corresponding transducer elements to route signals on the channels to respective ones of the transducer elements according to signal processing required for the desired application and obtain signals received by the transducer elements.

In yet another aspect, there is provided a computer readable medium comprising one or more sets of computer executable instructions for dynamically performing one of a plurality of subsea acoustic applications using a common software defined sonar platform, the one or more sets of computer executable instructions comprising instructions for implementing the method described above.

In yet another aspect, there is provided a broadband transducer array for transmitting and receiving acoustic signals for a software defined sonar transceiver, the transducer array comprising one or more transducer elements each having a communicable connection for the transceiver; and a sensor module, the sensor module comprising one or more sensors for monitoring environmental conditions surrounding the transducer array, the one or more sensors comprising at least one position monitoring sensor for providing information to the transceiver to control signals to be sent via the transducer array to compensate for movement of the transducer array.

Embodiments will now be described by way of example only with reference to the appended drawings wherein:. As noted above, it has been found that by utilizing a software defined platform with a broadband phased array transducer, a configurable, multi-function sonar system can be provided to enable various subsea acoustic systems to be achieved in a single configurable unit thus reducing the space required on the vessel and the cost of having such multiple functions.

The software defined platform operates in conjunction with a broadband phased array transducer in order to provide a broadband of frequencies to accommodate various functions such as a split beam sounder, Doppler profiler, sub bottom profiler and many more. The array utilizes a large set of individual transducer elements to enable dynamic beam-forming, beam-splitting, and beam-steering for long-range detection of targets and currents.

In this way, the system can adapt to and compensate for changing environments. Turning now to FIG. The system 10 comprises a software defined sonar SDS transceiver 12 connected to a broadband phased array transducer 14 and a bridge computer 16 that is typically situated on the bridge 18 of a marine vessel In this example, the transducer array 14 is driven by the SDS transceiver 12 , which is controlled by a user on the bridge 18 or elsewhere by the bridge computer It will be appreciated that the SDS transceiver 12 can also be configured to be controlled remotely and need not always be operated from directly onboard the vessel In FIG.

As discussed later, it will be appreciated that the transducer array 14 is capable of generating a plurality of beams 22 for implementing different subsea acoustic functions. The transducer array 14 comprises a sensor module 26 for measuring the pitch and roll of the transducer 14 and various other parameters of the water in which the transducer array 14 is submerged as will be explained in greater detail later.

By incorporating the sensor module 26 directly into the transducer array 14 , the actual environmental conditions, e. As shown in FIG. In this example, the sensor module 26 is connected to the SDS transceiver 12 via a serial link 27 but may communicate via any suitable connection. The serial link 27 enables the SDS transceiver to obtain the measurements gathered by the sensor module 26 as well as to configure the sensor module 26 according to a function being implemented.

For example, an RS serial link may be used. The transducer array 14 , as will be explained later, comprises a set of transducers see also FIG. A set of electrical connections 25 connects the SDS transceiver 12 to each transducer individually, e. The SDS transceiver 12 is connected to the bridge computer 16 via a communication connection 29 , e. The bridge computer 16 in this example comprises a display unit 28 for providing a user interface to enable a user to interact with the SDS transceiver 12 for selecting between different functions and viewing and analyzing data.

The bridge computer 16 can be configured to operate an existing bridge software program It will be appreciated that the functions 34 and software module 32 are shown separate from the bridge software program 30 for illustrative purposes only. Some embodiments may utilize a software program that includes all functionality in single program or may comprise several distinct software modules depending on the application.

The bridge computer 16 may also include an auxiliary input 38 such as a Bluetooth, USB or other communication link to enable configuration updates 36 to be uploaded to the system 10 , e. The updates 36 can also be used to perform firmware upgrades, sync data, download data or perform any other data transfer task required by the application. As can be seen in FIG. It will be appreciated that the SDS transceiver 12 in some embodiments can operate autonomously or remotely, i.

Similarly, new SDS transceivers 12 or those not currently deployed may also need programming from an external computing device and thus should be capable of communicating directly, either via the Ethernet link 29 or the auxiliary input Also, the updates 36 can be used to system modules in the transducer array 14 as well as in the sensor module As can be appreciated, the system 10 includes various hardware components that can be configured to perform various functions 34 using firmware that either resides in the system 10 upon initial programming, or is downloaded at a later time, e.

Turning to FIG. The security layer in general associates a unique identifier UID with a particular system 10 or hardware component thereof and requires that the firmware to be used with the hardware can identify the UID, e.

The security chip 15 also comprises an encryption engine 9 which uses the secret key 13 to decrypt encrypted firmware 11 to obtain the actual firmware The UID may also be used to identify which hardware component in the system 10 is to be programmed.

In order to control the use of the secret keys, any firmware 17 that is generated for a particular product e. When a customer, supplier, etc. The secret key 13 is then downloaded into the security chip 15 and the UID provided to the embedded PC Either at the time of purchasing or later via an upgrade, the unique firmware 17 is encrypted by an encryption engine 9 using the secret key 13 to generate encrypted firmware 11 , and downloaded by the embedded PC The encrypted firmware 11 , as noted above, may carry the public UID and only the proper secret key 13 stored in the security chip 15 associated with the UID can properly decrypt the encrypted firmware 11 to obtain the actual firmware If the UID matches and the proper secret key 13 is used, then the firmware 17 can run.

If not, then the firmware 17 is locked or otherwise denied. It can be seen therefore that the firmware 17 is bound to specific hardware so that it can only be used on the hardware that has been provisioned for that product. The customer cannot then move the firmware 17 to another product that does not have that particular feature without paying for an upgrade specific to that product.

In the example shown in FIG. It can be appreciated that the same principles can be applied to other modules in the system For example, a security chip 15 can be installed in the sensor module 26 or the transducer array 14 at some other location and a secret key 13 for that particular module embedded to bind certain data to that module see also FIG.

As such, the principles in FIG. By binding the hardware and firmware using the UID and the secret key 13 , more control can be had over the proprietary IP of the system 10 to avoid counterfeit after market upgrades or copying of firmware 17 to other products. The embedded PC 52 is provided to offload the intensive processing from the FPGA 50 and to enable external devices to connect to the SDS transceiver 12 , in particular the bridge computer In a receive mode, the Triac switch can also be used which allows the transducer signals to be routed to the proper receive channel A low-noise amplifier 80 is used, as its name would suggest, to amplify the incoming signal without adding significant noise and while exhibiting high linearity capabilities and providing some impedance matching with the transducer.

It has been found that high linearity can be important in detecting low level signals in the presence of high noise levels and interference. For example, if the processing here is not linear, the high level signal may clip the low level signal. Also, impedance matching is typically important in enabling maximum power transmission between the transceiver 12 and the transducer elements It may be noted that by changing components on the front end of the receive channel 56 , the impedance matching can be adjusted to suit the particular application, e.

After passing through the low-noise amplifier 80 the signal is then conditioned by an signal conditioner 82 e. It has been found that a dB programmable range providing a 40 dB maximum attenuation of the signal is suitable.

The signal conditioner 82 can be used to add negative gain to the signal, which is advantageous when dealing with high level input signals. The signal generated by the transducers are analog signals. In order to digitally process the data in the signal, the signal is fed through an analog-to-digital converter ADC For the configuration shown, a 24 bit ADC 84 is appropriate that is based on a sigma delta conversion technique and which uses an over-sampling method to spread the quantization noise across a wide bandwidth.

The ADC 84 may include a modulator not shown to shape the noise and shift it to a higher frequency. The signal, once converted to a digital form, undergoes digital filtering The digital filtering 86 can be used to remove the out-of-band signal, which reduces noise and distortion in the signal and maintains linearity and the phase of the signal.

The digital filtering 86 can also perform signal anti-aliasing. Digital filtering 86 that provides dB attenuation at the Nyquist frequency has been found to be suitable and which acts as an finite impulse response FIR filter with 96 taps with software configurable coefficients. A reference REF 88 is applied to the ADC 84 , which provides a filtered, low-noise reference voltage that gives the absolute voltage value to the samples such that any samples that are read can be readily converted into acoustic dB, given a particular transducer type.

A direct digital synthesizer DDS 90 may also be provided to generate the frequency that drives the ADC 84 and digital filtering The DDS 90 is a fully programmable module which can allow the system 10 to perform various types of sampling according to the desired filtering. The FPGA 50 is used to perform the bulk of the signal processing and due to its inherent programmable capabilities, enables the transmit channels 58 and receive channels 56 to operate according to different functions for implementing different subsea acoustic applications as discussed above.

As noted above, the FPGA 50 performs signal processing, which enables the delivery of filtered and prepared data to the embedded PC 52 for mathematical processing. In this way, the FPGA 50 can emulate an 8 bit or 32 bit microprocessor, which is programmed on the fly to run any type of firmware per the chosen function The signal, as processed by the DDS core 72 , is then input to a digital-to-analog converter DAC 92 , which transforms the digitally modulated signal into an analog signal that is suitable for driving the transducer It has been found that a DAC 92 providing a 86 dB spurious free dynamic range for a signal of up to 1 MHz is suitable.

The analog signal is then provided to a signal amplifier amp 94 , which buffers the signal for the power amplifier 96 since, in this example, the DAC 92 does not utilize any buffering and, to provide impedance matching and to facilitate power transmission. In some embodiments, the power amplifier 96 can be a Class-H type amplifier, i.

It has been recognized that although a Class-D type amplifier could be an appropriate choice for a sonar application, Class-D amplifiers typically have a high frequency of kHz, which makes such an amplifier unable to provide a signal with good phase information, which does not lend itself to a broadband operation due to its inherent transistor architecture.

Also, since Class-H amplifiers do not generate as much heat, a smaller heat sink can be used and the form factor is also typically small. In this example, the voltage can be programmed, e. Different voltages can be generated based on the core technology used, i. Also, voltages can be isolated and parallelized to provide extra filtering. The signal output by the power amplifier 96 is then provided to a level transformer transf. Such information can be used by the software running on the embedded PC 52 to determine a more accurate angle of arrival of a receive signal, e.

The embedded PC 52 in this example comprises various data links for communicating with external elements. In this example, two serial data links 62 e.

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US7158447B2 - Sonar transmitter - Google Patents

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