A multi-probe depth sounder system

Abstract

The invention relates to the technical field of acoustic wave water depth detection, and in particular to a multi-probe depth sounder system, comprising a power supply circuit and a depth sounder system, wherein the power supply circuit provides power to the depth sounder system for power supply; the depth sounder system comprises a DSP circuit, a transceiver circuit, a channel selection circuit and a plurality of transducer probes which are bidirectionally connected in sequence, and the DSP circuit is unidirectionally connected to the channel selection circuit; the multi-probe depth sounder controls and selects a plurality of transducer probes to work in turn through the channel selection circuit, thereby obtaining water depth data of the plurality of transducer probes; the invention provides a multi-probe depth sounder system, and the invention adds transducer probes on the basis of a single-beam depth sounder through the multi-probe depth sounder system designed this time, thereby increasing the number of measurement points, meeting the requirement of high efficiency in large-scale measurement in shallow waters, thereby reducing material and manpower.

Description

Technical Field

[0001] The invention relates to the technical field of acoustic wave water depth detection, and in particular to a multi-probe depth sounder system. Background Art

[0002] With the increasing depletion of land resources, the investigation and development of marine resources have received increasing attention. The commonly used method to obtain water depth information of underwater points (rivers, lakes, reservoirs and seas) is to use sonar sounding. Currently, common equipment includes single-beam echo sounders and multi-beam echo sounder systems.

[0003] Single-beam echo sounders are light, compact, easy to install, have low requirements, are simple to use, are cheap, and have low entry barriers. However, they have low data density, are not precise in scanning, and are not efficient. Multi-beam echo sounders have high data density, precise scanning, and high efficiency. They can more accurately measure the size, shape, and height changes of underwater targets, draw more detailed contour lines, and more realistically reflect the underwater terrain and geomorphic features. However, they are large in size, heavy in weight, require many auxiliary equipment, are expensive, are complex to install, have high requirements, and are more cumbersome to operate in the field. They require more manpower and material resources, and have a high entry barrier.

[0004] At present, single-beam echo sounders are mainly used in water depth measurement projects in various water conditions such as rivers, ports and coastal areas. Generally speaking, they do not require high data density. In these places, the application of single-beam echo sounders can reflect the advantages of low price and simple operation. Multi-beam echo sounders are mainly used in places with relatively deep water depths, large scanning areas, and fine mapping effects. In these places, the use of multi-beam echo sounders can reflect the advantages of high efficiency and fine mapping.

[0005] However, at present, the places near the coast are generally not very deep. When a large ship needs to enter the port to clear obstacles or rip stones and tamp down, etc., which requires high-efficiency measurement, the single-beam echo sounder can only measure one point at a time, and the multi-beam has a limited beam angle and thus a small scanning range in shallow water. In these shallow waters, the advantage of the multi-beam echo sounder's wide scanning range cannot be brought into play. Due to the complex installation and cumbersome operation of the multi-beam echo sounder, people are generally unwilling to use the multi-beam echo sounder for measurement in these places.

[0006] The multi-probe depth sounder designed this time adds transducer probes based on the single-beam depth sounder, thereby increasing the number of measurement points and meeting the requirements of high-efficiency measurement over a large range in shallow waters. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a multi-probe echo sounder system. The multi-probe echo sounder system designed by the present invention adds transducer probes on the basis of the single-beam echo sounder, thereby increasing the number of measuring points, meeting the requirements of high-efficiency measurement over a large range in shallow waters, thereby reducing material and manpower.

[0008] The present invention is achieved through the following technical solutions:

[0009] A multi-probe depth sounder system comprises a power supply circuit and a depth sounding system, wherein the power supply circuit provides power to the depth sounding system for power supply;

[0010] The depth sounding system comprises a DSP circuit, a transceiver circuit, a channel selection circuit and a plurality of transducer probes which are bidirectionally connected in sequence, and the DSP circuit is unidirectionally connected to the channel selection circuit;

[0011] The multi-probe depth sounder controls and selects a plurality of the transducer probes to work in turn through the channel selection circuit, thereby obtaining water depth data of the plurality of the transducer probes.

[0012] Preferably, the power supply circuit includes an AC-to-DC power supply module, a comparator, a plurality of DCDC power supply modules and a reverse connection alarm circuit;

[0013] The AC to DC power supply module enables the multi-probe depth sounder to support AC power supply, and the multiple DCDC power supply modules provide different voltages for various components in the depth sounding system. Through the comparator and the multiple DCDC power supply modules, if the external power supply voltage is too low or too high, the relay is disconnected, thereby protecting the multi-probe depth sounder;

[0014] In addition, through the reverse connection alarm circuit, if the external power supply DC power supply is accidentally reversed, the reverse connection alarm circuit will be turned on and a buzzer will be generated, thereby preventing damage to other circuits.

[0015] Preferably, the DSP circuit includes a power chip, a DSP chip, a network communication chip, an AD chip / DA chip and a FLASH chip;

[0016] The power chip converts the voltage provided by the power circuit into voltages suitable for different chips.

[0017] Preferably, the transceiver circuit includes a transmitting circuit and a receiving circuit;

[0018] The transmitting circuit includes a waveform processor, a half-bridge power amplifier and a transformer which are connected in one direction in sequence, and also includes a power selection circuit, a charge and discharge circuit and the half-bridge power amplifier which are connected in one direction in sequence;

[0019] The receiving circuit comprises a transmitting and receiving conversion circuit, an isolation coupling circuit, a preamplifier circuit, a first band-pass filter circuit, an AGC, a second band-pass filter circuit, a post-amplifier circuit and a detection circuit which are connected in sequence in a unidirectional manner.

[0020] Preferably, the channel selection circuit includes a plurality of optocoupler isolation relays, and the DSP circuit provides selection signals of the plurality of transducer probes to the 4-16 decoder in a loop. After being connected to the transceiver circuit through the relay, one of the transducer probes is controlled to work while the other transducer probes are controlled not to work.

[0021] Preferably, every two of the relays correspond to one of the transducer probes.

[0022] The beneficial effects of the present invention are:

[0023] The multi-probe echo sounder system designed in the present invention adds a transducer probe on the basis of a single-beam echo sounder, thereby increasing the number of measurement points, meeting the requirements of high-efficiency measurement over a large area in shallow waters, thereby reducing material and manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a working schematic diagram of the multi-probe depth sounder in the present invention;

[0026] Figure 2 It is a principle block diagram of the multi-probe depth sounder system in the present invention;

[0027] Figure 3 It is a block diagram of the power supply circuit in the present invention;

[0028] Figure 4 It is a principle block diagram of the transmitting circuit in the present invention;

[0029] Figure 5 It is a principle block diagram of the receiving circuit in the present invention;

[0030] Figure 6 It is a principle block diagram of the DSP processing circuit in the present invention;

[0031] Figure 7 This is a schematic diagram of the channel selection circuit in the present invention.

[0032] In the figure: 1-power supply circuit, 101-AC to DC power supply module, 102-comparator, 103-reverse connection alarm circuit, 2-depth sounding system, 201-DSP circuit, 202-transceiver circuit, 203-channel selection circuit, 2021-transmitting circuit, 20121-waveform processor, 20122-half-bridge power amplifier, 20123-transformer, 20124-power selection circuit, 20125-charging and discharging circuit, 2022-receiving circuit, 20221-transmitting and receiving conversion circuit, 20222-isolation coupling circuit, 20223-preamplifier circuit, 20224-first band-pass filter circuit, 20225-AGC, 20226-second band-pass filter circuit, 20227-post-amplifier circuit, 20228-detection circuit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1:

[0035] See also Figure 1-7 As shown: the present invention specifically discloses a multi-probe depth sounder system, including a power supply circuit 1 and a depth sounding system 2, wherein the power supply circuit 1 provides power to the depth sounding system 2;

[0036] See also Figure 2As shown: the depth sounding system 2 includes a DSP circuit 201, a transceiver circuit 202, a channel selection circuit 203 and multiple transducer probes which are bidirectionally connected in sequence, and the DSP circuit 201 is unidirectionally connected to the channel selection circuit 203; the power supply circuit 1 adopts a wide range input, and can generate a stable power supply with sufficient power to supply the single-beam depth sounding system 2 when the external power input range is 10V to 36V. The transceiver circuit 202 is the key to the depth measurement capability. The transmitting circuit 2021 receives the control signal from the DSP circuit 201, and after driving and amplifying, it is loaded on the transducer probe through the channel selection circuit 203 and transmitted. The bottom echo is received by the transducer probe and input through the isolation transformer 20123 in the receiving circuit 2022, and is output to the DSP circuit 201 processing board through the preamplifier circuit 20223, the first bandpass filter circuit 20224, the second bandpass filter circuit 20226, the AGC 20225, the post-amplifier circuit 20227 and the detector circuit 20228. The control gain of the AGC 20225 is generated by the DA chip of the DSP circuit 201 processing board. The DSP circuit 201 processing is the operation center of the depth measurement system 2, responsible for system synchronization and depth measurement tracking, controlling the power and pulse width of the transmitter through the network port, controlling the receiving gain, collecting the envelope signal output by the receiver and sending it to the external device through the network port.

[0037] The multi-probe depth sounder controls and selects multiple transducer probes to work in turn through the channel selection circuit 203, thereby obtaining the water depth data of multiple transducer probes; further, as Figure 1 There are 4 transducer probes shown in the figure, which can actually be expanded to any number of probes as needed. The multi-probe echo sounder selects multiple probes to work in turn through channel control, thereby obtaining water depth data from multiple probes.

[0038] Where d is the horizontal distance between the two transducer probes, H is the water depth at the transducer probe, Θ is half of the -3dB opening angle of the transducer, and the beam angle is set to 4 degrees. The radius R of the footprint of the transducer probe sound wave beam has a definite relationship with the above parameters. Ideally, the spacing d between the transducer probes is kept at about twice R. Basically, when measuring depth, the depth of the bottom of the water will not be missed, and the measured depth points will not be repeated. If the terrain is complex, it is necessary to make a certain degree of adjustment based on this. The following table shows the reference values ​​of the horizontal distance of the transducer probes corresponding to the water depth, for reference when measuring depth.

[0039]

[0040]

[0041] Specific reference Figure 3As shown, the power supply circuit 1 includes an AC-to-DC power supply module 101, a comparator 102, multiple DCDC power supply modules and a reverse connection alarm circuit 103; considering the performance of the whole machine, the selected DCDC power supply modules are all mature power supply modules with low power consumption and low noise.

[0042] The multi-probe echo sounder supports AC power supply through the AC to DC power supply module 101, and multiple DCDC power supply modules provide different voltages for various components in the echo sounding system 2. Through the comparator 102 and multiple DCDC power supply modules, if the external power supply voltage is too low or too high, the relay is disconnected, thereby protecting the multi-probe echo sounder;

[0043] In addition, through the reverse connection alarm circuit 103, if the external power supply DC power supply is accidentally reversed, the reverse connection alarm circuit 103 will be turned on and a buzzer will be generated, so that other circuits will not be damaged. Specifically, the AC to DC module enables the whole machine to support AC power supply, and through the comparator 102 and the wide range 24V to 9V power supply module, if the external power supply voltage is lower than 10V or higher than 32V, the relay is disconnected, thereby protecting the whole machine.

[0044] In addition, through the reverse connection alarm, if the external DC power supply is accidentally reversed, the reverse connection alarm circuit 103 will be turned on and a buzzer will be generated, so that other circuits will not be damaged.

[0045] For details, see Figure 6 As shown: DSP circuit 201 includes a power chip, a DSP chip, a network communication chip, an AD chip / DA chip and a FLASH chip;

[0046] The power chip converts the voltage provided by the power circuit 1 into voltages suitable for different chips.

[0047] Furthermore, the DSP circuit 201 has many internal chips and requires three power supplies: 5V, 3.3V and 1.5V. The power supply circuit 1 provides a 5V power supply. The 5V power supply is converted into a group of 3.3V power supplies through the TLV1117LV33 chip on the processing circuit. The 5V power supply is converted into a group of 1.5V power supplies through the TPS77315 chip.

[0048] The communication chip used is the W5200 chip, which is an embedded Ethernet controller with an integrated full hardware TCP / IP protocol stack, providing an Ethernet access solution for the microcontroller. The full hardware TCP / IP protocol stack is designed to simplify the traditional software TCP / IP protocol stack, unload the MCU's threads for processing TCP / IP, and save hardware resources such as the MCU's internal ROM;

[0049] The AD chip used is THS1206IDA, which is a 12-bit high-speed A / D converter based on pipeline structure developed by TI. This A / D converter adopts pipeline structure and can process multiple analog signals in parallel, so it can obtain higher conversion speed; and can correct internal errors through its internal correction circuit to obtain higher accuracy. Here, the analog echo signal in the receiving circuit 2022 is converted into a digital signal through the THS1206IDA chip so as to provide the DSP signal for subsequent processing;

[0050] The DA chip used is TLV5614, which is a 12-bit voltage output analog-to-digital converter (DAC) composed of four parts with a flexible serial interface, so that it can be seamlessly connected to the TMS320 TM 、SPI TM 、QSPI TM and Microwire TM Serial port. It is mainly used to receive the digital signal of DSP and convert it into analog signal, so as to control the automatic gain of receiving circuit 2022;

[0051] The FLASH chip used is 29LV400. Compared with EPROM, FLASH has high integration, low power consumption, and can be electrically erased and written. In addition, the 3.3V FLASH can be directly interfaced with the DSP, and the interface circuit design is convenient. 29LV400 has the advantages of single power supply operation, fast access speed, long read and write life, and low power consumption, so we use it to store programs and data.

[0052] The processing chip uses TI's TMS320VC5416 fixed-point DSP, which uses an improved Harvard bus structure inside. The data bus width is 16b, and the maximum addressing space is 64K×16b. The program bus width is 23b, and the maximum addressing space is 8M×16b. There are 128M×16b RAM, 6-channel DMA transfer controller, and 3 serial communication interfaces (McBSP) with buffers on the chip. The separate data and instruction spaces give the chip a high degree of parallel operation capability, allowing instructions and data to be accessed simultaneously in a single cycle. Coupled with its highly optimized instruction set, the chip has a very high operating speed, up to 160MIPS. The processing chip is the computing center of the entire device, responsible for system synchronization, depth tracking, controlling the power and pulse width of the transmitter, switching the operation of the 4 transducer probes, controlling the receiving gain, collecting the envelope signal output by the receiver, and sending the measured value to the external device through the cable.

[0053] Specifically, the transceiver circuit 202 includes a transmitting circuit 2021 and a receiving circuit 2022;

[0054] See also Figure 4 As shown: the transmitting circuit 2021 includes a waveform processor 20121, a half-bridge power amplifier 20122 and a transformer 20123 connected in one direction in sequence, and also includes a power selection circuit 20124, a charge and discharge circuit 20125 and a half-bridge power amplifier 20122 connected in one direction in sequence; further, here we select UC2706 for waveform processing. UC2706 divides the low-voltage drive signal given by the DSP circuit 201, and after the frequency division processing, generates two PWM waves to drive the two MOSFET tubes on the half bridge respectively. After passing through the two MOSFETs, the transformer 20123 is driven to further increase the transmitting voltage, thereby driving the transducer probe at the rear end to send out energy.

[0055] The charge and discharge circuit 20125 mainly includes energy storage capacitors and fast discharge circuits. The energy is stored in large-capacity energy storage capacitors to provide energy for the instant of transmitting signals. The fast discharge circuit ensures that the energy in the capacitor can be quickly discharged when the whole machine is powered off, thereby ensuring safety.

[0056] The power selection circuit 20124 controls the driving voltage on the MOSFET tube by comparing the voltage with the energy storage capacitor, shutting off the charging channel when a certain voltage is reached, and opening the charging circuit when the voltage is lower than the set voltage, thereby playing a power selection role.

[0057] See also Figure 5 As shown: the receiving circuit 2022 includes a transceiver conversion circuit 20221, an isolation coupling circuit 20222, a preamplifier circuit 20223, a first bandpass filter circuit 20224, an AGC 20225, a second bandpass filter circuit 20226, a post-amplifier circuit 20227 and a detector circuit 20228, which are connected in sequence in a unidirectional manner; further, since the transducer probe of the multi-probe depth sounder adopts a transceiver integrated mode, the receiving circuit 2022 must first pass through a transceiver conversion circuit 20221 and an isolation coupling circuit 20222. Through the transceiver conversion circuit 20221, when transmitting, the transceiver conversion circuit 20221 is equivalent to a short circuit, and the receiving circuit 2022 will not be burned. When the transducer probe receives, the tiny signal can pass through the transceiver conversion circuit 20221, and the subsequent receiving circuit 2022 performs subsequent amplification processing.

[0058] Both the preamplifier circuit 20223 and the post-amplifier circuit 20227 amplify weak signals.

[0059] The propagation of acoustic signals in water will cause diffusion loss and absorption loss. The diffusion loss is proportional to the square of the propagation distance. The signal processing circuit performs time gain control (TVG) on the receiving circuit 2022 to compensate for the propagation loss of the acoustic signal and suppress near-zone interference and reverberation. This is the function of the TVG circuit.

[0060] The so-called AGC20225 (automatic gain control circuit) is to make the gain of the receiving circuit 2022 automatically change with the strength of the input, so that its output remains basically constant. AGC20225 is controlled by the DSP circuit 201 signal processing board. When the DSP circuit 201 signal processing board detects that the output voltage of the receiving circuit 2022 becomes larger, the gain of AGC20225 is controlled to decrease. When the DSP circuit 201 signal processing board detects that the output voltage of the receiving circuit 2022 becomes smaller, the gain of AGC20225 is controlled to increase. In this way, the system gain of the receiving circuit 2022 is automatically adjusted according to the strength of the input signal.

[0061] The main functions of the first band-pass filter circuit 20224 and the second band-pass filter circuit 20226 are to transmit the signals within the required specific frequency range and block the signals outside this frequency range, so as to achieve the purpose of selective transmission.

[0062] Since the DSP circuit 201 signal processing board needs a pulse signal for subsequent processing, after the receiving circuit 2022 amplifies and filters the signal received from the bottom of the water, a detection circuit 20228 must be performed.

[0063] For details, see Figure 7 As shown: the channel selection circuit 203 includes multiple optocoupler isolation relays, and the DSP circuit 201 provides selection signals of multiple transducer probes to the 4-16 decoder in a loop. After being connected to the transceiver circuit 202 through the relay, one of the transducer probes is controlled to work, while the other transducer probes are not working.

[0064] Specifically, every two relays correspond to one of the transducer probes.

[0065] Furthermore, due to the special needs of the multi-probe depth sounder circuit, the controlled multi-way electronic switch must not only withstand the impact of the high-frequency, high-current, and high-voltage transmitting circuit 2021, but also have good anti-interference when receiving weak signals. The minimum signal of the receiving circuit 2022 is only tens of microvolts or even a few microvolts. Under this condition, it is necessary to ensure that the electronic switch is not affected by the external power supply of the electronic switch. The relay we use here is AQY277AX, which is an optocoupler isolation relay widely used in measuring and testing equipment, IC testers, and high-speed detection machines. It has a small size, supports various types of load control and is highly sensitive. Its maximum peak-to-peak value at the output end is 200V, the average current at the output end is 0.65A, the peak current at the output end is 2.0A, and the average on-resistance is 0.7Ω, which can meet our design requirements.

[0066] 4-16 Decoder We have chosen the 74HC154 chip. When the DCBA terminal of the decoder is inputted with 0000, 0001, 0010, 0011, ... ... until 1111, it can be seen from the truth table of the chip that when the input is 0000, the 0th pin of the output terminal is 0, when the input is 0001, the 1st pin of the output terminal is 0, and when the input is 1111, the 15th pin of the output terminal is 0. In this way, when the input is 0000, 0001 ... ... 1111 in a loop, a pin is selected to be 0 in sequence.

[0067] The DSP circuit 201 provides the selection signal of the transducer probe to the 4-16 decoder in a cycle, and the decoder can provide the selection signal corresponding to the 16 transducer probes, so that the 16 transducer probes work in a cycle according to the coding sequence.

[0068] Since the schematic diagram of 16 transducer probes is too large, only 4 transducer probes are used as an example. Figure 7 As shown, these four selection signals are usually at low level, and the four transducer probes do not work. Since the transducer has positive and negative poles, two relays are used to correspond to one of the transducer probes.

[0069] The DSP circuit 201 will only select one transducer probe to work at each moment. When the DSP circuit 201 selects the transducer probe of channel 1 according to an external command, the decoder will give a low signal to channel 1, and the other three channels will be high. At this time, relays 1 and 2 will be turned on, and transducer probe 1 will be connected to the transceiver circuit 202 after passing through relays 1 and 2. Transducer probe 1 will be in working state, and the other three transducer probes will not work. When the DSP circuit 201 selects the transducer probe of channel 2 according to an external command, the decoder will give a low signal to channel 2. At this time, relays 3 and 4 will be turned on, and transducer probe 2 will be connected to the transceiver circuit 202 after passing through relays 3 and 4. Transducer probe 2 will work, and the other three transducer probes will not work. When the DSP circuit 201 selects the transducer probe of channel 3 according to an external command, the decoder will give a low signal to channel 3. At this time, relays 5 and 6 are turned on, and transducer probe 3 is connected to the transceiver circuit 202 after passing through relays 5 and 6. Transducer probe 3 works, and the other three transducer probes do not work. When the DSP circuit 201 selects the transducer probe of channel 4 according to an external command, the decoder will give a low signal to channel 4. At this time, relays 7 and 8 are turned on, and transducer probe 4 is connected to the transceiver circuit 202 after passing through relays 7 and 8. Transducer probe 4 works, and the other three transducer probes do not work. By analogy, one of the 16 transducer probes can be controlled to work through the decoder cycle, while the other transducer probes do not work.

[0070] Through this circuit, the DSP circuit 201 can continuously obtain the depth measurement information of one of the 16 transducer probes, thereby obtaining the depth measurement information of the entire 16 transducer probes in a very short period of time.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-probe depth sounder system, characterized in that: It includes a power supply circuit and a depth sounding system, wherein the power supply circuit provides power to the depth sounding system; The depth sounding system comprises a DSP circuit, a transceiver circuit, a channel selection circuit and a plurality of transducer probes which are bidirectionally connected in sequence, and the DSP circuit is unidirectionally connected to the channel selection circuit; The multi-probe depth sounder controls and selects a plurality of the transducer probes to work in turn through the channel selection circuit, thereby obtaining water depth data of the plurality of the transducer probes; The transceiver circuit includes a transmitting circuit and a receiving circuit; The transmitting circuit includes a waveform processor, a half-bridge power amplifier and a transformer which are connected in one direction in sequence, and also includes a power selection circuit, a charge and discharge circuit and the half-bridge power amplifier which are connected in one direction in sequence; The receiving circuit includes a transceiver conversion circuit, an isolation coupling circuit, a preamplifier circuit, a first band-pass filter circuit, an AGC, a second band-pass filter circuit, a post-amplifier circuit and a detector circuit which are connected in sequence in a unidirectional manner; The channel selection circuit includes a plurality of optical coupling isolation relays, and the DSP circuit provides a selection signal of a plurality of transducer probes to the 4-16 decoder in a loop, and after being connected to the transceiver circuit through the relay, one of the transducer probes is controlled to work, while the other transducer probes are not controlled to work; Keep the spacing d between the transducer probes at twice R, where d is the horizontal distance between the two transducer probes and R is the radius of the transducer probe acoustic beam footprint.

2. A multi-probe depth sounder system according to claim 1, characterized in that: The power supply circuit includes an AC to DC power supply module, a comparator, a plurality of DCDC power supply modules and a reverse connection alarm circuit; The AC to DC power supply module enables the multi-probe depth sounder to support AC power supply, and the multiple DCDC power supply modules provide different voltages for various components in the depth sounding system. Through the comparator and the multiple DCDC power supply modules, if the external power supply voltage is too low or too high, the relay is disconnected, thereby protecting the multi-probe depth sounder; In addition, through the reverse connection alarm circuit, if the external power supply DC power supply is accidentally reversed, the reverse connection alarm circuit will be turned on and a buzzer will be generated, thereby preventing damage to other circuits.

3. A multi-probe depth sounder system according to claim 1, characterized in that: The DSP circuit includes a power chip, a DSP chip, a network communication chip, an AD chip / DA chip and a FLASH chip; The power chip converts the voltage provided by the power circuit into voltages suitable for different chips.

4. A multi-probe depth sounder system according to claim 1, characterized in that: Every two of the relays correspond to one of the transducer probes.

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