CN114166190A - Synchronous circuit for positioning and water depth data and operation method of processing circuit - Google Patents

Abstract

The invention relates to a synchronous circuit for positioning and water depth data and a processing circuit operation method, wherein the synchronous circuit comprises a GPS positioning device, a synchronous circuit module, an energy converter and a PC remote platform, the GPS positioning device simultaneously outputs PPS signals and positioning data, the synchronous circuit module is in communication connection with the GPS positioning device, the input end of the synchronous circuit module receives the PPS signals and the positioning data, and the synchronous circuit module comprises a signal level conversion circuit, a serial port circuit, a processing circuit and a network port circuit. The invention can adopt one network port to finish the transmission of sound image, positioning data and water depth data, reduces interfaces, facilitates the connection between devices, simplifies the working process and eliminates physical delay; after the circuit is adopted, the error caused by the inconsistency of the sampling rate of the sounding data and the positioning data is reduced, and meanwhile, the error of the water depth data and the actual positioning data on a time axis caused by sound propagation and processing time is also avoided.

Description

Synchronous circuit for positioning and water depth data and operation method of processing circuit

Technical Field

The invention relates to a data acquisition synchronization technology, in particular to a synchronization circuit for positioning and water depth data and a processing circuit operation method.

Background

The water depth signal is widely applied to various sonar equipment for underwater target detection. Echo sounders are conventional bathymetry devices that use underwater acoustic signals to make range finding, and are also the most popular detection devices in use today. The working principle of the device is that a transducer emits sound waves with certain frequency, when the sound waves propagate in water, reflected signals can be generated when the sound waves encounter media with different densities (such as water bottom or other objects), and the linear distance from the transducer to a reflecting target is obtained according to the round-trip time of the sound waves and the propagation speed of the sound waves in the water of a measured area, namely the water depth is measured.

The GPS positioning device is indispensable for the echo depth sounder, because if the water depth data does not know the position where the water depth data is measured, the water depth data has no meaning, when the underwater topography is measured, the GPS positioning device and the echo depth sounder are generally required to be used together, the measurement data of the GPS positioning device and the echo depth sounder are transmitted to an industrial personal computer, and the positioning data and the water depth data are recorded, processed and stored in the navigation software in a one-to-one correspondence manner, so that the underwater topography measurement is completed.

However, in the combination of the conventional GPS positioning device and the echo sounder, there is a phenomenon that the positioning data and the water depth data are not synchronized, so that there is an error in the underwater topography measurement result, which is caused by various factors. There are several factors.

A) The sampling rates of the positioning data and the sounding data are not consistent, a plurality of water depth data may exist between the two positioning data, so that when the navigation software selects the water depth data, one water depth data is randomly selected from the plurality of water depth data between the two positioning data, and the positioning data and the water depth data can cause errors on a time axis;

B) the GPS directly sends the data to the navigation software through a physical serial port, and the sounding data is sent to the navigation software through a virtual serial port, so that a time error is generated, and the GPS and the water depth are not synchronous.

C) When a ship advances, the depth measuring principle of the depth measuring instrument is that the water depth is measured through sound propagation, the currently measured water depth value is actually the water depth of a position where sound waves are transmitted before, but the GPS records information of the current position, so that the data of the depth measuring instrument actually has time delay of signal transmission and processing, when the ship is used for measuring a steep slope, if the ship is opened towards the shore, the measured water depth data can be larger than a normal water depth value, and if the ship is opened towards the center of water, the measured water depth data can be shallower than the normal water depth value, so that the measurement effect on an equal depth line can be jagged, which is not supposed.

In order to overcome the factors, a circuit is designed, so that the positioning data and the water depth data can be well time-synchronized, and errors are reduced.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the problem that the positioning data and the water depth data of the sounding instrument in the prior art cause errors on a time axis, so that a synchronous circuit of the positioning data and the water depth data and a processing circuit operation method are provided.

In order to solve the technical problem, the synchronous circuit for positioning and water depth data comprises a GPS positioning device, a synchronous circuit module, a transducer and a PC remote platform, wherein the GPS positioning device simultaneously outputs a PPS signal and positioning data, the synchronous circuit module is connected with the GPS positioning device in a communication way, the input end of the synchronous circuit module receives the PPS signal and the positioning data, the synchronous circuit module comprises a signal level conversion circuit, a serial port circuit, a processing circuit and a network port circuit, the PPS signal and the positioning data are communicated and connected with the processing circuit through a signal level conversion circuit and a serial port circuit, the output interactive end of the synchronous circuit module is the output end of the processing circuit, the output end of one path of the processing circuit is interactively connected with the transducer through the transceiving circuit, and the output end of the other path of the processing circuit is interactively connected with the PC remote platform through the network port circuit.

In one embodiment of the present invention, the signal level shift circuit turns the/TrigIn signal low when the PPS signal is high, since Q1 is on; when the PPS signal is low, the/TrigIn signal is high at 3.3V because Q1 is not conducting.

In an embodiment of the present invention, the serial port circuit adopts a MAX3160EAP and a TL16C754BPN chip, and the MAX3160EAP can realize conversion between an RS-232 level and a TTL level, so that the MAX3160EAP converts serial port data of an external GPS positioning device into a TTL signal and transmits the TTL signal to the TL16C754 BPN.

In an embodiment of the invention, the processing circuit comprises a CPLD chip, a FLASH chip and a DSP processing chip, wherein the CPLD chip reads the PPS signal for triggering and then outputs a trigger signal to the DSP processing chip in the launch pad, and then the DSP processing chip outputs the result data to the network port circuit by completing the complex water depth signal processing and the interpolation operation of the positioning data, and the FLASH chip backs up the positioning data and the time information in the DSP processing chip.

In one embodiment of the present invention, the FLASH chip is 29LV 400.

In one embodiment of the invention, the DSP processing chip adopts TMS320VC5416 of TI company.

In one embodiment of the present invention, the CPLD employs XC95288 XL.

In an embodiment of the invention, the network port circuit adopts W5200, and the network port circuit can be connected with a PC remote platform through an SPI interface through an Interne network.

In yet another aspect, the present invention relates to a method for operating a processing circuit, the method for operating the processing circuit based on the processing circuit building design, comprising the following steps:

step S1: when the CPLD chip receives the falling edge pulse on the level conversion circuit, the CPLD chip sends a pulse signal to the transmitting circuit to perform primary sound wave transmission, the electric signal received by the transducer is amplified through the receiving circuit, and the water depth data is obtained after primary processing is completed through the DSP chip;

step S2: storing the positioning data and the time information in the serial port circuit in the FLASH;

step S3: because the water depth data is generally higher than the sampling rate of the positioning data, a plurality of water depth data exist between the two positioning data, and positioning information and time information corresponding to other water depth data in the two positioning data are calculated through the DSP chip according to the two positioning data;

step S4: and stamping a time stamp, and packaging each water depth data and one positioning data into PING data to be transmitted out through a network port circuit.

Compared with the prior art, the technical scheme of the invention has the following advantages: the synchronous circuit for positioning and water depth data and the operation method of the processing circuit can adopt one network port to finish the transmission of sound images, positioning data and water depth data, reduce interfaces, facilitate the connection between equipment, simplify the working process and eliminate physical delay; after the circuit is adopted, the error caused by the inconsistency of the sampling rate of the sounding data and the positioning data is reduced, and the error of the water depth data and the actual positioning data on a time axis caused by sound propagation and processing time is avoided; when the steep slope is used for depth measurement, no saw tooth exists in the measurement effect on the equal-depth line, and the circuit is proved to solve the problem of synchronization of water depth data and positioning data.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a system block diagram of a synchronization circuit for positioning and water depth data in accordance with the present invention;

FIG. 2 is a schematic circuit diagram of the signal level shifting circuit of the present invention;

FIG. 3 is a schematic circuit diagram of the serial port circuit of the present invention;

FIG. 4 is a functional block diagram of the processing circuitry of the present invention;

fig. 5 is a schematic diagram of a portal circuit of the present invention.

Detailed Description

As shown in fig. 1, the present embodiment provides a synchronization circuit for positioning and water depth data, which comprises a GPS positioning device, a synchronization circuit module, a transducer, and a PC remote platform, wherein the GPS positioning device outputs PPS signal and positioning data at the same time, the synchronous circuit module is connected with the GPS positioning device in a communication way, the input end of the synchronous circuit module receives the PPS signal and the positioning data, the synchronous circuit module comprises a signal level conversion circuit, a serial port circuit, a processing circuit and a network port circuit, the PPS signal and the positioning data are communicated and connected with the processing circuit through a signal level conversion circuit and a serial port circuit, the output interactive end of the synchronous circuit module is the output end of the processing circuit, the output end of one path of the processing circuit is interactively connected with the transducer through the transceiving circuit, and the output end of the other path of the processing circuit is interactively connected with the PC remote platform through the network port circuit.

Further, when a synchronous circuit system receives a PPS signal, the time information and the positioning data transmitted by the GPS through a serial port are stored, a sound wave is triggered to emit, an echo signal of the transducer is amplified by a receiving circuit and then processed to obtain a water depth value, and the stored time information and the positioning data are packed together and transmitted to navigation software on a PC remote platform through a network interface circuit.

Because the interval time of the two PPS signals is only 1 second, the path track of the ship can be acquiescent to be a straight line, the transmitted sound wave is also measured between the two PPS signals, and the position of each water depth point can be obtained through a proportional algorithm according to the time difference of the transmitted sound wave relative to the PPS signals. Therefore, each depth point has corresponding time information and positioning data information, and the delay problem of depth measurement data and positioning data can be accurately solved.

Further, as shown in fig. 2, since the PPS signal is finally connected to the CPLD chip in the processing circuit, the power supply voltage of the chip is 3.3V, and the PPS signal is at the TTL level, and the voltage range when the PPS signal is high is 2.4V to 5V, which is 5V in the normal case, and if the PPS signal is at 5V input, the CPLD chip is damaged.

When the PPS signal is at a high level, the signal level conversion circuit turns on Q1, so that the/TrigIn signal is low; when the PPS signal is low, the/TrigIn signal is high at 3.3V because Q1 is not conducting.

Meanwhile, level falling edge triggering is adopted in the CPLD chip, and the transmitting driving signal is transmitted once every time the level falling edge exists, so that the PPS signal triggering function is realized. Meanwhile, as long as the PPS signal is TTL high level, the circuit can output low level, so that the voltage range of the adaptive external signal is wide.

As shown in fig. 3, the serial port circuit adopts a MAX3160EAP and a TL16C754BPN chip, and the MAX3160EAP can realize conversion between an RS-232 level and a TTL level, so that the MAX3160EAP converts serial port data of an external GPS positioning device into a TTL signal and transmits the TTL signal to the TL16C754 BPN.

Furthermore, the MAX3160EAP is a high-performance multi-protocol transceiver with programmable pins, the chip is powered by + 3V- +5V single power supply, and the unique low-voltage difference sending output stage and the internal double-charge pump structure can meet RS-232 and RS422/485 protocol structures, and have the functions of power saving mode and overcurrent and overheat protection.

The TL16C754BPN is a large-scale integrated circuit chip with an asynchronous serial communication function, and mainly provides reliable and flexible interface service between DCE equipment and DTE equipment. The internal part of the system consists of bus control, data transceiving control and interrupt control. It is a chip capable of supplying power for both 5V and 3.3V, but considering that the CPLD chip in the processing circuit is supplied with power for 3.3V, we also use power for 3.3V here, which greatly simplifies the interface connection between them.

The TL16C754BPN is adopted for serial asynchronous communication, the serial asynchronous communication is initialized firstly, then the transceiving communication programming, the error checking and the like are carried out, and the processes are finished by reading and writing and logic judgment of a register in the CPLD chip.

I.e. the transfer of the positioning data from the external GPS device to the processing circuit is completed.

As shown in fig. 4, the processing circuit includes a CPLD chip, a FLASH chip, and a DSP processing chip, wherein the CPLD chip reads the PPS signal and outputs a trigger signal to the DSP processing chip in the launch pad after triggering, and then the DSP processing chip outputs the result data to the network interface circuit by completing the complex water depth signal processing and the interpolation operation of the positioning data, and the FLASH chip backs up the positioning data and the time information in the DSP processing chip.

Furthermore, the processing circuit is an operation center of the whole depth finder, is responsible for system synchronization and depth finding tracking, controls the power and pulse width of the transmitter, controls the receiving gain, acquires envelope signals output by the receiver, processes the envelope signals to obtain acoustic images and water depth data, and then transmits the data to the PC platform through a network. We use the electricity to realize the positioning data and water depth data synchronization function at the same time of completing the above functions.

The FLASH chip adopts 29LV400, and compared with an EPROM, the FLASH chip has the advantages of high integration level, low power consumption and electric erasing, and the 3.3V FLASH can be directly interfaced with a DSP, so that the interface circuit is convenient to design. The 29LV400 has the advantages of single power supply operation, high access speed, long read-write service life, low power consumption and the like, so that the 29LV400 is used for storing programs and data.

The DSP processing chip adopts TMS320VC5416 of TI company, and the separated data and instruction space enables the chip to have high parallel operation capability, allows instructions and data to be accessed simultaneously in a single period, and enables the chip to have high operation speed by adding a highly optimized instruction set, wherein the chip is used for finishing complex water depth signal processing, interpolation operation of positioning data and output of network port data.

The CPLD adopts XC95288XL, is a 3.3V low-voltage and high-efficiency CPLD, and is widely applied to communication and computer systems. It contains 16 54V18 functional blocks, providing 6400 gates available. The PPS trigger signal reading device is mainly used for reading PPS trigger signals, outputting the trigger signals to a transmitting board and receiving serial port data.

The network port circuit adopts W5200, and can be connected with a PC remote platform through an Interne network through an SPI interface.

Further, as shown in fig. 5, W5200 is well suited for implementation of the TCPIP protocol stack, 10/100M ethernet MAC and PHY on a single chip. The W5200 has a 32K memory therein for storing communication data. Using W5200, users can implement their desired application of ethernet communication by simple port programming without having to deal with complicated ethernet control. Therefore, the chip is adopted, and the transmission of network data can be conveniently completed by sending a control command and data to the W5200 through the DSP chip.

After the water depth data and the positioning data are transmitted to the PC platform through the network data, the water depth data and the positioning data can be collected, processed and displayed through the domestic navigation software, and therefore water depth measurement is completed.

A method of processing circuit operation, said method of processing circuit operation based on said processing circuit build design, comprising the steps of:

step S1: when the CPLD chip receives the falling edge pulse on the level conversion circuit, the CPLD chip sends a pulse signal to the transmitting circuit to perform primary sound wave transmission, the electric signal received by the transducer is amplified through the receiving circuit, and the water depth data is obtained after primary processing is completed through the DSP chip;

step S2: storing the positioning data and the time information in the serial port circuit in the FLASH;

step S3: because the water depth data is generally higher than the sampling rate of the positioning data, a plurality of water depth data exist between the two positioning data, and positioning information and time information corresponding to other water depth data in the two positioning data are calculated through the DSP chip according to the two positioning data;

step S4: and stamping a time stamp, and packaging each water depth data and one positioning data into PING data to be transmitted out through a network port circuit.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (9)

1. A synchronous circuit for positioning and water depth data is characterized by comprising a GPS positioning device, a synchronous circuit module, a transducer and a PC remote platform, wherein the GPS positioning device simultaneously outputs PPS signals and positioning data, the synchronous circuit module is connected with the GPS positioning device in a communication way, the input end of the synchronous circuit module receives the PPS signal and the positioning data, the synchronous circuit module comprises a signal level conversion circuit, a serial port circuit, a processing circuit and a network port circuit, the PPS signal and the positioning data are communicated and connected with the processing circuit through a signal level conversion circuit and a serial port circuit, the output interactive end of the synchronous circuit module is the output end of the processing circuit, the output end of one path of the processing circuit is interactively connected with the transducer through the transceiving circuit, and the output end of the other path of the processing circuit is interactively connected with the PC remote platform through the network port circuit.

2. A synchronization circuit for positioning and water depth data according to claim 1, wherein: when the PPS signal is at a high level, the signal level conversion circuit turns on Q1, so that the/TrigIn signal is low; when the PPS signal is low, the/TrigIn signal is high at 3.3V because Q1 is not conducting.

3. A synchronization circuit for positioning and water depth data according to claim 1, wherein: the serial port circuit adopts MAX3160EAP and TL16C754BPN chips, and the MAX3160EAP can realize the conversion between RS-232 level and TTL level, so that the MAX3160EAP converts the serial port data of external GPS positioning equipment into TTL signals and transmits the TTL signals to the TL16C754 BPN.

4. A synchronization circuit for positioning and water depth data according to claim 1, wherein: the processing circuit comprises a CPLD chip, a FLASH chip and a DSP processing chip, wherein the CPLD chip outputs a trigger signal to the DSP processing chip in the transmitting board after reading the PPS signal trigger, the DSP processing chip outputs result data to the network port circuit by completing complex water depth signal processing and interpolation operation of positioning data, and the FLASH chip backups the positioning data and time information in the DSP processing chip.

5. A synchronization circuit for positioning and water depth data according to claim 4, wherein: the FLASH chip adopts 29LV 400.

6. A synchronization circuit for positioning and water depth data according to claim 4, wherein: the DSP processing chip adopts TMS320VC5416 of TI company.

7. A synchronization circuit for positioning and water depth data according to claim 4, wherein: the CPLD adopts XC95288 XL.

8. A synchronization circuit for positioning and water depth data according to claim 1, wherein: the network port circuit adopts W5200, and can be connected with a PC remote platform through an Interne network through an SPI interface.

9. A method of operating a processing circuit based on the processing circuit building design of claim 4, comprising the steps of:

step S1: when the CPLD chip receives the falling edge pulse on the level conversion circuit, the CPLD chip sends a pulse signal to the transmitting circuit to perform primary sound wave transmission, the electric signal received by the transducer is amplified through the receiving circuit, and the water depth data is obtained after primary processing is completed through the DSP chip;

step S2: storing the positioning data and the time information in the serial port circuit in the FLASH;

step S3: because the water depth data is generally higher than the sampling rate of the positioning data, a plurality of water depth data exist between the two positioning data, and positioning information and time information corresponding to other water depth data in the two positioning data are calculated through the DSP chip according to the two positioning data;

step S4: and stamping a time stamp, and packaging each water depth data and one positioning data into PING data to be transmitted out through a network port circuit.

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