Satellite integrated electronic differential analog signal acquisition system and method

Abstract

The invention provides a satellite integrated electronic differential analog signal acquisition system and method. The system comprises a differential input switch circuit, a differential signal analog-to-digital conversion circuit and a central processing unit. The differential input switch circuit is used for processing an analog signal output by satellite single-machine equipment under target channel gating and outputting the analog signal to the differential signal analog-to-digital conversion circuit; and the differential signal analog-to-digital conversion circuit is used for converting the analog signal into a corresponding digital signal and transmitting the digital signal to the central processing unit. According to the application, the single-ended analog signal and the differential analog signal can be acquired, the requirement of acquiring the high-precision analog signal is met, and the universality of the satellite integrated electronic analog quantity acquisition system is improved.

Description

Technical Field

[0001] The present application relates to the field of satellite technology, and in particular to a satellite integrated electronic differential analog signal acquisition system and method. Background Art

[0002] In satellite integrated electronics, analog quantity telemetry acquisition and measurement is an important function of satellite integrated electronics. Specifically, it monitors the working status of each single device by collecting analog quantities such as voltage, current, temperature, etc. from other single devices, and packages the collected data into telemetry information, which is transmitted to the ground station through the measurement and control unit.

[0003] At present, due to the large number of single-machine devices in the entire satellite and the fact that each single-machine device has more than one analog quantity, the number of analog signals is large. Therefore, the time-division multiplexing of the analog quantity acquisition channel is generally achieved by connecting multiple channel selection switches in series in the satellite integrated electronic analog quantity acquisition system.

[0004] However, the current satellite integrated electronic analog acquisition system collects single-ended signals and it is difficult to collect differential signals. Differential signals are less affected by process and temperature changes and have lower timing errors. Due to these advantages of differential signals, they are increasingly widely used in transmitting precision signals in complex electromagnetic environments such as satellites. This requires a method for collecting differential signals. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a satellite integrated electronic differential analog signal acquisition system and method, which can process the analog signal output by a satellite stand-alone device under the target channel selection through a differential input switching circuit, output the analog signal to a differential signal analog-to-digital conversion circuit, and convert the analog signal into a corresponding digital signal through the differential signal analog-to-digital conversion circuit, and transmit the digital signal to a central processing unit. Single-ended analog signals and differential analog signals can be collected, meeting the needs of collecting high-precision analog signals and improving the versatility of the satellite integrated electronic analog quantity acquisition system.

[0006] In a first aspect, an embodiment of the present application provides a satellite integrated electronic differential analog signal acquisition system, the system comprising: a differential input switch circuit, a differential signal analog-to-digital conversion circuit, and a central processing unit;

[0007] The input end of the differential input switch circuit is respectively connected to the output end of the external control circuit and the output end of the external satellite stand-alone device, and the output end of the differential input switch circuit is connected to the input end of the differential signal analog-to-digital conversion circuit; the output end of the differential signal analog-to-digital conversion circuit is connected to the central processing unit through a synchronous serial interface corresponding to a preset synchronous serial communication bus;

[0008] The differential input switch circuit is used to process the analog signal output by the satellite stand-alone device under the target channel selection, and output the analog signal to the differential signal analog-to-digital conversion circuit; wherein the analog signal includes a differential analog signal and a single-ended analog signal; the target channel is the channel determined by the control circuit outputting the control signal to the differential input switch circuit for selection; the control signal includes an enable signal and a channel selection signal;

[0009] The differential signal analog-to-digital conversion circuit is used to convert an analog signal into a corresponding digital signal and transmit the digital signal to the central processing unit.

[0010] In a possible implementation, the differential input switch circuit includes a first-stage differential input switch and a second-stage differential input switch; the first-stage differential input switch includes a first differential input switch and a second differential input switch, and the second-stage differential input switch includes a third differential input switch;

[0011] The input end of the first differential input switch is connected to the output end of the control circuit and the output end of the satellite stand-alone device respectively, the output end of the first differential input switch is connected to the input end of the third differential input switch, and is connected to the input end of the differential signal analog-to-digital conversion circuit through the third differential input switch;

[0012] The input end of the second differential input switch is respectively connected to the output end of the control circuit and the output end of the satellite stand-alone device, the output end of the second differential input switch is connected to the input end of the third differential input switch, and is connected to the input end of the differential signal analog-to-digital conversion circuit through the third differential input switch.

[0013] In a possible implementation manner, the first differential input switch and the second differential input switch are used to process the analog signal output by the satellite stand-alone device and output the analog signal to the third differential input switch;

[0014] The third differential input switch is used to output the analog signal to the differential signal analog-to-digital conversion circuit.

[0015] In a possible implementation, the first differential input switch and the second differential input switch are first analog multiplexers, and the third differential input switch is a second analog multiplexer; the differential signal analog-to-digital conversion circuit is a high-performance analog conversion chip;

[0016] The first differential input switch and the second differential input switch have a first number of single-ended analog signal input channels or a second number of pairs of differential signal input channels in total; wherein the first number is twice the second number.

[0017] In a possible implementation manner, the first differential input switch, the second differential input switch and the third differential input switch each include a first side output terminal and a second side output terminal, and the third differential input switch also includes a first side input terminal and a second side input terminal; the input terminal of the differential signal analog-to-digital conversion circuit includes a positive input terminal and a negative input terminal;

[0018] The first side output end of the first differential input switch and / or the second differential input switch is connected to two first side input ends of the third differential input switch, and the second side output end of the first differential input switch and / or the second differential input switch is connected to one first side input end and one second side input end of the third differential input switch; wherein the first side output end and the second side output end of the first differential input switch and the second differential input switch are respectively pinched together;

[0019] The first side output terminal and the second side output terminal of the third differential input switch are respectively connected to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit.

[0020] In a possible implementation manner, when the analog signal is the differential analog signal; a first side input terminal and a second side input terminal of the first differential input switch and / or the second differential input switch process the analog signal; wherein the first side input terminal corresponds to the second side input terminal;

[0021] The first differential input switch and / or the second differential input switch are used to select the target channel according to the received enable signal and the channel selection signal, connect the first side output terminal to the two first side input terminals of the third differential input switch, and connect the second side output terminal to one first side input terminal and one second side input terminal of the third differential input switch;

[0022] The third differential input switch is used to select the target channel according to the received enable signal and the channel selection signal, and connect the first side output terminal and the second side output terminal to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit respectively. The differential signal analog-to-digital conversion circuit is used to convert the differential analog signal into a corresponding digital signal and send the digital signal to the central processing unit.

[0023] In a possible implementation manner, when the analog signal is the single-ended analog signal, one of the first-side input ends of the first differential input switch and / or the second differential input switch processes the analog signal;

[0024] The first differential input switch and / or the second differential input switch are used to connect the first side output terminal to the two first side input terminals of the third differential input switch, and the second side output terminal to one first side input terminal and one second side input terminal of the third differential input switch when the target channel is selected;

[0025] The third differential input switch is used for connecting the first side output terminal and the second side output terminal to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit respectively when the target channel is selected; wherein the positive input terminal represents the single-ended analog signal, and the negative input terminal is grounded;

[0026] The differential signal analog-to-digital conversion circuit is used to convert the single-ended analog signal into a corresponding digital signal and send the digital signal to the central processing unit.

[0027] In a possible implementation manner, the target channel gating is determined by the following steps:

[0028] In response to the target differential input switch receiving the enable signal and the channel selection signal, determining whether the enable signal is at a high level; wherein the target differential input switch is the first differential input switch and / or the second differential input switch and / or the third differential input switch;

[0029] If so, determine that the target differential input switch is working normally, determine the target channel corresponding to the channel selection signal and implement the selection of the target channel; wherein the target channel includes a first side channel and a second side channel at the input end of the target differential input switch; the target differential input switch includes a third number of first side channels and second side channels; the first side channels and the second side channels correspond one to one; and the second number is twice the third number.

[0030] In a second aspect, an embodiment of the present application provides a satellite integrated electronic differential analog signal acquisition method, the satellite integrated electronic differential analog signal acquisition method is applied to a satellite integrated electronic differential analog signal acquisition system, the system comprising: a differential input switch circuit, a differential signal analog-to-digital conversion circuit and a central processing unit; the method comprises:

[0031] The differential input switch circuit processes the analog signal output by the satellite stand-alone device under the target channel selection, and outputs the analog signal to the differential signal analog-to-digital conversion circuit; wherein the analog signal includes a differential analog signal and a single-ended analog signal; the target channel is a channel determined by the control circuit outputting a control signal to the differential input switch circuit; the control signal includes an enable signal and a channel selection signal;

[0032] The differential signal analog-to-digital conversion circuit converts the analog signal into a corresponding digital signal, and transmits the digital signal to the central processing unit;

[0033] In a possible implementation, the differential input switch circuit includes a first-stage differential input switch and a second-stage differential input switch; the first-stage differential input switch includes a first differential input switch and a second differential input switch, and the second-stage differential input switch includes a third differential input switch; the processing of the analog signal output by the satellite stand-alone device and outputting the analog signal to the differential signal analog-to-digital conversion circuit includes:

[0034] The first differential input switch and / or the second differential input switch processes the analog signal output by the satellite stand-alone device, and outputs the analog signal to the third differential input switch;

[0035] The third differential input switch outputs the analog signal to the differential signal analog-to-digital conversion circuit.

[0036] The embodiment of the present application provides a satellite integrated electronic differential analog signal acquisition system and method, the input end of the differential input switch circuit is respectively connected to the output end of the external control circuit and the output end of the external satellite stand-alone device, and the output end of the differential input switch circuit is connected to the input end of the differential signal analog-to-digital conversion circuit; the output end of the differential signal analog-to-digital conversion circuit is connected to the central processing unit through a synchronous serial interface corresponding to a preset synchronous serial communication bus; the differential input switch circuit is used to process the analog signal output by the satellite stand-alone device under the target channel gating, and output the analog signal to the differential signal analog-to-digital conversion circuit; the differential signal analog-to-digital conversion circuit is used to convert the analog signal into a corresponding digital signal, and transmit the digital signal to the central processing unit. In the present application, the analog signal output by the satellite stand-alone device is processed by the differential input switch circuit under the target channel gating, the analog signal is output to the differential signal analog-to-digital conversion circuit, and the analog signal is converted into a corresponding digital signal through the differential signal analog-to-digital conversion circuit, and the digital signal is transmitted to the central processing unit, so that single-ended analog signals and differential analog signals can be collected, which meets the demand for collecting high-precision analog signals and improves the versatility of the satellite integrated electronic analog quantity acquisition system.

[0037] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a structural diagram of an existing analog signal acquisition system;

[0040] Figure 2 It is a structural schematic diagram of a satellite integrated electronic differential analog signal acquisition system according to an embodiment of the present application;

[0041] Figure 3 It is a schematic diagram of the structure of the satellite integrated electronic differential analog signal acquisition system;

[0042] Figure 4 This is a schematic diagram of the internal components of ADG1207;

[0043] Figure 5 This is a schematic diagram of the internal components of ADG509;

[0044] Figure 6 This is a schematic diagram of the internal components of the satellite integrated electronic differential analog signal acquisition system;

[0045] Figure 7 This is a schematic diagram of a satellite integrated electronic differential analog signal acquisition system collecting differential analog signals;

[0046] Figure 8 This is a schematic diagram of a satellite integrated electronic differential analog signal acquisition system collecting single-ended analog signals;

[0047] Fig. 9 It is a flowchart of a satellite integrated electronic differential analog signal acquisition method according to an embodiment of the present application. DETAILED DESCRIPTION

[0048] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0049] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0050] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0051] Considering that analog quantity telemetry acquisition and measurement is an important function of satellite integrated electronics, it specifically monitors the working status of each single device by collecting analog quantities such as voltage, current, temperature, etc. from other single devices, and packages the collected data into telemetry information, which is then transmitted to the ground station through the measurement and control unit.

[0052] At present, due to the large number of single-machine devices in the entire satellite and the fact that each single-machine device has more than one analog quantity, the number of analog signals is large. Therefore, the time-division multiplexing of the analog quantity acquisition channel is generally achieved by connecting multiple channel selection switches in series in the satellite integrated electronic analog quantity acquisition system.

[0053] For example, Figure 1As shown, a satellite integrated electronic differential analog signal acquisition system supporting 32 analog inputs includes a two-stage switch, a single-ended signal analog-to-digital converter and a central processing unit (CPU). Among them, switch 1 and switch 2 form the first-stage switch, and switch 3 is the second-stage switch. If the first-stage input analog quantity of switch 1 is collected, switch 1 and switch 3 are enabled, and then the first-stage input analog quantity is selected by setting the channel selection signal of switch 1 and switch 3, and then the analog quantity is converted into a digital signal through the analog-to-digital conversion chip, and the digital signal is transmitted to the central processing unit through the synchronous serial communication bus (Serial Peripheral Interface, SPI).

[0054] However, the current satellite integrated electronic analog quantity acquisition system collects single-ended signals and is difficult to collect differential signals. The good coupling between the two wires of the differential signal helps to resist external noise interference and can effectively suppress electromagnetic interference. The switching change of the differential signal occurs at the intersection of the two signals. Unlike the single-ended signal, it does not rely on the threshold voltage. Therefore, the differential signal is less affected by process and temperature changes, and the timing error is lower. Due to these advantages of differential signals, it is increasingly widely used in transmitting precision signals in complex electromagnetic environments such as satellites. This requires a method for collecting differential signals.

[0055] To address this problem, an embodiment of the present application provides a satellite integrated electronic differential analog signal acquisition system and method, which processes the analog signal output by a satellite stand-alone device under target channel selection through a differential input switching circuit, outputs the analog signal to a differential signal analog-to-digital conversion circuit, and converts the analog signal into a corresponding digital signal through the differential signal analog-to-digital conversion circuit, and transmits the digital signal to a central processing unit. Single-ended analog signals and differential analog signals can be acquired, meeting the needs of acquiring high-precision analog signals and improving the versatility of the satellite integrated electronic analog quantity acquisition system.

[0056] Figure 2 FIG. 1 is a schematic diagram of the structure of a satellite integrated electronic differential analog signal acquisition system according to an embodiment of the present application. Figure 2 As shown, the satellite integrated electronic differential analog signal acquisition system 200 of the embodiment of the present application may specifically include: a differential input switch circuit 1, a differential signal analog-to-digital conversion circuit 2 and a central processing unit 3.

[0057] The input end of the differential input switch circuit 1 is respectively connected to the control signal output end of the external control circuit and the output end of the external satellite stand-alone device, and the output end of the differential input switch circuit 1 is connected to the input end of the differential signal analog-to-digital conversion circuit 2; the output end of the differential signal analog-to-digital conversion circuit 2 is connected to the central processor 3 through a synchronous serial interface (SPI interface) corresponding to a preset synchronous serial communication bus (SPI bus). The number of satellite stand-alone devices is at least one. For example, Figure 3 As shown, switch 1, switch 2, and switch 3 constitute a differential input switch circuit 1, and the differential signal analog-to-digital conversion and CPU respectively represent the differential signal analog-to-digital conversion circuit 2 and the central processing unit 3 of the present application. It can be seen that the differential input switch circuit 1 outputs to the differential signal analog-to-digital conversion circuit 2, and the differential signal analog-to-digital conversion circuit 2 is connected to the central processing unit 3 via the SPI bus.

[0058] Optionally, the differential signal analog-to-digital conversion circuit 2 may also be connected to the central processor 3 via other communication methods other than the SPI bus, which is not limited here.

[0059] The differential input switch circuit 1 is used to process the analog signal output by the satellite stand-alone device under the target channel selection, and output the analog signal to the differential signal analog-to-digital conversion circuit 2. The analog signal includes a differential analog signal and a single-ended analog signal. The target channel is the channel selected by the control circuit outputting the control signal to the differential input switch circuit 1, and the control signal includes an enable signal and a channel selection signal. In other words, the control circuit is used to output the control signal to the differential input switch circuit 1 to control the target channel selection of the differential input switch circuit 1.

[0060] The differential signal analog-to-digital conversion circuit 2 is used to convert the analog signal into a corresponding digital signal and transmit the digital signal to the central processing unit 3.

[0061] The satellite integrated electronic differential analog signal acquisition system 200 of the present application, the input end of the differential input switch circuit 1 is respectively connected to the output end of the external control circuit and the output end of the external satellite stand-alone device, and the output end of the differential input switch circuit 1 is connected to the input end of the differential signal analog-to-digital conversion circuit 2; the output end of the differential signal analog-to-digital conversion circuit 2 is connected to the central processing unit 3 through a synchronous serial interface corresponding to a preset synchronous serial communication bus; the differential input switch circuit 1 is used to process the analog signal output by the satellite stand-alone device under the target channel selection, and output the analog signal to the differential signal analog-to-digital conversion circuit 2; the differential signal analog-to-digital conversion circuit 2 is used to convert the analog signal into a corresponding digital signal, and transmit the digital signal to the central processing unit 3. The satellite integrated electronic differential analog signal acquisition system of the present application processes the analog signal output by the satellite stand-alone device under the target channel selection through the differential input switch circuit, outputs the analog signal to the differential signal analog-to-digital conversion circuit, and converts the analog signal into a corresponding digital signal through the differential signal analog-to-digital conversion circuit, and transmits the digital signal to the central processing unit. It can collect single-ended analog signals and differential analog signals, meets the needs of collecting high-precision analog signals, and improves the versatility of the satellite integrated electronic analog quantity acquisition system.

[0062] It should be noted that the differential input switch circuit 1 includes a first-stage differential input switch and a second-stage differential input switch; the first-stage differential input switch includes a first differential input switch and a second differential input switch, and the second-stage differential input switch includes a third differential input switch. Figure 3 As shown, switch 1 and switch 2 form a first-stage differential input switch, switch 1 and switch 2 represent a first differential input switch and a second differential input switch respectively, and switch 13 represents a second-stage differential input switch, that is, switch 13 represents a third differential input switch.

[0063] Further, the input end of the first differential input switch is respectively connected to the output end of the control circuit and the output end of the satellite stand-alone device, the output end of the first differential input switch is connected to the input end of the third differential input switch, and is connected to the input end of the differential signal analog-to-digital conversion circuit 2 through the third differential input switch; the input end of the second differential input switch is respectively connected to the output end of the control circuit and the output end of the satellite stand-alone device, the output end of the second differential input switch is connected to the input end of the third differential input switch, and is connected to the input end of the differential signal analog-to-digital conversion circuit 2 through the third differential input switch, for example, Figure 3 shown.

[0064] Among them, the first differential input switch and the second differential input switch are used to process the analog signal output by the satellite stand-alone device and output the analog signal to the third differential input switch; the third differential input switch is used to output the analog signal to the differential signal analog-to-digital conversion circuit 2.

[0065] It should be noted that the first differential input switch and the second differential input switch are first analog multiplexers, the third differential input switch is a second analog multiplexer, and the differential signal analog-to-digital conversion circuit 2 is a high-performance analog conversion chip. Figure 3 The differential switch model used for switch 1 and switch 2 is ADG1207 (as shown in Figure 4 As shown), the differential switch model selected for switch 3 is ADG509 (as shown Figure 5 As shown in FIG. 1 , the analog conversion chip used is AD7685. It can be explained that other types of differential switches and analog conversion chips can be selected.

[0066] It can be added here that the ADG1207 is a high-performance analog multiplexer with 8 differential channels. The ADG1207 can switch one of the differential input channels to a common differential output by selecting the 3-bit binary address lines A0, A1 and A2. This makes it very useful in multi-channel data acquisition systems because it allows one of multiple analog signals to be selected for transmission and processing without allocating independent lines for each signal; the ADG509 is an analog multiplexer that can switch one of the four differential inputs to a common differential output according to the state of the three binary address lines A0, A1 and A2.

[0067] The analog conversion chip used is AD7685, which is a high-performance analog front-end chip that integrates various functions required for analog signal processing. It has a built-in 16-bit ADC (Analog-to-Digital Converter) that can provide a sampling rate of up to 250ksps to meet the requirements for high-precision analog signal acquisition. It supports single-ended and differential inputs, as well as input signals in a variety of voltage ranges to adapt to different equipment requirements, and provides a variety of digital interfaces such as SPI and I2C to facilitate communication with the CPU.

[0068] In short, the differential analog-to-digital conversion chip has a 16-bit quantization bit number, which can provide high-precision digital output and is suitable for applications requiring high accuracy. It has a fast conversion rate of up to 250kSPS, and the built-in conversion clock reduces the need for an external clock source, simplifying system design.

[0069] It should also be noted that the first differential input switch and the second differential input switch have a first number of single-ended analog signal input channels or a second number of pairs of differential signal input channels. The first number is twice the second number. Figure 6 As shown, switch 1 and switch 2 have a total of 32 single-ended analog signal input channels or 16 pairs of differential signal input channels.

[0070] Further, the first differential input switch, the second differential input switch and the third differential input switch all include a first side output terminal and a second side output terminal, and the third differential input switch also includes a first side input terminal and a second side input terminal; the input terminal of the differential signal analog-to-digital conversion circuit 2 includes a positive input terminal and a negative input terminal. For example, Figure 6 As shown, A represents the first side, B represents the second side, DA represents the first side output terminal of the first differential input switch, the second differential input switch and the third differential input switch, DB represents the second side output terminal of the first differential input switch, the second differential input switch and the third differential input switch, the S1A-S4A input terminals of the switch 3 represent the first side input terminals of the third differential input switch, and the S1B-S4B input terminals of the switch 3 represent the second side input terminals of the third differential input switch; the input terminals of the differential signal analog-to-digital conversion circuit 2 include a positive input terminal IN+ and a negative input terminal IN-.

[0071] To continue, the first side output end of the first differential input switch and / or the second differential input switch is connected to the two first side input ends of the third differential input switch, and the second side output end of the first differential input switch and / or the second differential input switch is connected to one first side input end and one second side input end of the third differential input switch; the first side output end and the second side output end of the third differential input switch are respectively connected to the positive input end and the negative input end of the differential signal analog-to-digital conversion circuit 2. Among them, the first side output end and the second side output end of the first differential input switch and the second differential input switch are respectively pinched together.

[0072] For example, Figure 6 As shown, the first side output terminal DA and the second side output terminal DB of switch 1 and switch 2 are respectively pinched together, DA is connected to the two first side input ports S1A and S3A of switch 3, DB is connected to the two first side and second side input terminals S2A and S1B of switch 3, and the two-way analog signals output by switch 3 are connected to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit 2. The output terminal of the differential signal analog-to-digital conversion circuit 2 is an SPI interface, which is connected to the CPU through the SPI interface.

[0073] Further, when the analog signal is a differential analog signal, a first side input terminal and a second side input terminal of the first differential input switch and / or the second differential input switch process the analog signal. The first side input terminal and the second side input terminal correspond to each other. For example, Figure 7 As shown, taking a pair of differential analog input signals as an example, the differential analog signals are AN_IN_P and AN_IN_N. When AN_IN_P is connected to the S1A first-side input terminal of switch 1 of the first-stage switch, AN_IN_N needs to be connected to the corresponding B-side channel of the same switch, that is, the second-side input terminal, that is, the S1B input terminal.

[0074] Among them, the first differential input switch and / or the second differential input switch are used to realize the target channel selection according to the received enable signal and channel selection signal, connect the first side output end to the two first side input ends of the third differential input switch, and connect the second side output end to a first side input end and a second side input end of the third differential input switch; the third differential input switch is used to realize the target channel selection according to the received enable signal and channel selection signal, connect the first side output end and the second side output end to the positive input end and the negative input end of the differential signal analog-to-digital conversion circuit 2 respectively. The differential signal analog-to-digital conversion circuit 2 is used to convert the differential analog signal into a corresponding digital signal, and send the digital signal to the central processor 3.

[0075] It can be added here that the truth table of ADG1207 is shown in Table 1 below:

[0076] Table 1

[0077]

[0078] The truth table of ADG509 is shown in Table 2 below:

[0079] Table 2

[0080]

[0081] It should be noted that the target channel gating is determined by the following steps:

[0082] In response to the target differential input switch receiving the enable signal and the channel selection signal, it is determined whether the enable signal is at a high level; if so, it is determined that the target differential input switch is working normally, and the target channel corresponding to the channel selection signal is determined and the target channel is selected; if not, it is determined that the target differential input switch is invalid, that is, it cannot work normally.

[0083] Among them, the target differential input switch is the first differential input switch and / or the second differential input switch and / or the third differential input switch, the target channel includes the first side channel and the second side channel of the input end of the target differential input switch, the target differential input switch includes the first side channel and the second side channel of the third number, the first side channel and the second side channel correspond one to one, and the second number is twice the third number.

[0084] For example, taking the ADG1207 switch as the target differential input switch, as shown in Table 1, when the enable signal (EN) is low (0), the ADG1207 switch is invalid, and when the enable signal is high (1), the ADG1207 works normally, that is, it is effective; when the enable is effective (EN = 1), when the A0, A1 and A2 corresponding to the channel selection signal are all 0, the corresponding switch open channel (i.e., the target channel) is determined to be 1, that is, the first channel is selected, that is, DA = S1A and DB = S1B, and so on to determine the target channel corresponding to the channel selection signal to achieve the target channel selection. Similarly, as shown in Table 2, when the enable signal is low, the ADG509 switch is invalid; when the enable signal is high, the ADG509 works normally, and when the enable is effective, when A0 and A1 are both 0, the first channel is selected, that is, DA = S1A and DB = S1B, and so on.

[0085] Continuing, for example, Figure 7 As shown, the enable signal EN1 of switch 1 is 1, and A0, A1 and A2 are all 0. At this time, the corresponding target channel, i.e., the first channel, is selected, i.e., DA=S1A=AN_IN_P, DB=S1B=AN_IN_N. DA of switch 1 is connected to the two input ports S1A and S3A of switch 3, and DB of switch 1 is connected to the two input ports S2A and S1B of switch 3. The enable signal EN3 of switch 3 is 1, and A0 and A1 are 0. At this time, the first channel of switch 3 is selected, i.e., DA=S1A=AN_IN_P, DB=S1B=AN_IN_N of switch 3. DA and DB of switch 3 are respectively connected to the IN+ and IN- input terminals of the analog-to-digital conversion chip. The analog-to-digital conversion chip realizes the conversion of differential analog signals, converts them into digital signals, and sends them to the CPU through the SPI interface to complete the acquisition and transmission of differential analog signals.

[0086] Thereby, the acquisition of differential analog signals is realized.

[0087] Furthermore, when the analog signal is a single-ended analog signal, a first-side input terminal of the first differential input switch and / or the second differential input switch processes the analog signal.

[0088] Wherein, the first differential input switch and / or the second differential input switch is used to connect the first side output terminal to the two first side input terminals of the third differential input switch, and the second side output terminal to one first side input terminal and one second side input terminal of the third differential input switch when the target channel is selected.

[0089] The third differential input switch is used to connect the first side output terminal and the second side output terminal to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit 2 respectively when the target channel is selected; wherein the positive input terminal represents a single-ended analog signal and the negative input terminal is grounded to 0.

[0090] The differential signal analog-to-digital conversion circuit 2 is used to convert the single-ended analog signal into a corresponding digital signal and send the digital signal to the central processing unit 3.

[0091] For example, Figure 8 As shown in the figure, taking 1 single-ended analog input signal as an example, the single-ended signal acquisition process is described. The single-ended analog signal AN1 is connected to the S1A input terminal of switch 1 of the first-stage switch. The enable signal EN1 of switch 1 is 1, and A0, A1 and A2 are all 0. At this time, the determined target channel, that is, the first channel is selected, that is, DA=S1A=AN1, DB=S1B (suspended). The DA of switch 1 is connected to the two input ports S1A and S3A of switch 3, and the DB of switch 1 is connected to the two input ports S2A and S1B of switch 3. The enable signal EN3 of switch 3 is 1, A0 is 0, and A1 is 1. At this time, the third channel of switch 3 is selected, that is, DA=S3A=AN1, DB=S1B=0 (grounded) of switch 3. DA and DB of switch 3 are respectively connected to the IN+ and IN- input terminals of the analog-to-digital conversion chip, IN+=AN1, IN- is grounded to 0, and the analog-to-digital conversion chip realizes the conversion of single-ended analog signals, converts them into digital signals and sends them to the CPU through the SPI interface, completing the collection and transmission of single-ended analog signals.

[0092] It should be noted that the number of single-ended analog signals or differential analog signals input in the present application can be increased or decreased according to demand.

[0093] Thus, the collection of single-ended analog signals is realized. In summary, the collection of single-ended analog signals and differential analog signals is realized.

[0094] Fig. 9 1 is a flow chart of a satellite integrated electronic differential analog signal acquisition method according to an embodiment of the present application. The satellite integrated electronic differential analog signal acquisition method is applied to the satellite integrated electronic differential analog signal acquisition system 200 of the above embodiment. The satellite integrated electronic differential analog signal acquisition system 200 includes: a differential input switch circuit 1, a differential signal analog-to-digital conversion circuit 2 and a central processor 3; Fig. 9 As shown, the satellite integrated electronic differential analog signal acquisition method of the embodiment of the present application may specifically include the following steps S901-S902:

[0095] S901, the differential input switch circuit processes the analog signal output by the satellite stand-alone device under the target channel selection, and outputs the analog signal to the differential signal analog-to-digital conversion circuit.

[0096] Among them, the analog signal includes a differential analog signal and a single-ended analog signal; the target channel is the channel to be selected by the control circuit outputting the control signal to the differential input switch circuit 1; the control signal includes an enable signal and a channel selection signal.

[0097] It should be noted that the differential input switch circuit 1 includes a first-stage differential input switch and a second-stage differential input switch; the first-stage differential input switch includes a first differential input switch and a second differential input switch, and the second-stage differential input switch includes a third differential input switch.

[0098] As a possible implementation, the first differential input switch and / or the second differential input switch processes the analog signal output by the satellite stand-alone device, and outputs the analog signal to the third differential input switch; the third differential input switch outputs the analog signal to the differential signal analog-to-digital conversion circuit 2.

[0099] S902, the differential signal analog-to-digital conversion circuit converts the analog signal into a corresponding digital signal, and transmits the digital signal to the central processing unit.

[0100] For details, please refer to the satellite integrated electronic differential analog signal acquisition system in the above embodiment, and no further details will be given here.

[0101] The satellite integrated electronic differential analog signal acquisition method provided in the embodiment of the present application, the differential input switch circuit processes the analog signal output by the satellite stand-alone device under the target channel gating, and outputs the analog signal to the differential signal analog-to-digital conversion circuit, and the differential input switch circuit processes the analog signal output by the satellite stand-alone device under the target channel gating, and outputs the analog signal to the differential signal analog-to-digital conversion circuit. The satellite integrated electronic differential analog signal acquisition method of the embodiment of the present application can acquire single-ended analog signals and differential analog signals, meet the demand for acquiring high-precision analog signals, and improve the versatility of the satellite integrated electronic analog quantity acquisition system.

[0102] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed satellite integrated electronic differential analog signal acquisition system can be implemented in other ways. The circuit embodiments described above are merely schematic. For example, the division described is only a logical function division. There may be other division methods in actual implementation. For example, multiple or circuits can be combined or integrated into another circuit or module, or some features can be ignored or not executed.

[0103] The components described as separate components may or may not be physically separate, that is, they may be located on one circuit board, or they may be distributed on multiple circuit boards. Some or all of the circuits may be selected according to actual needs to achieve the purpose of the present embodiment.

[0104] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A satellite integrated electronic differential analog signal acquisition system, characterized in that: The system comprises: a differential input switch circuit, a differential signal analog-to-digital conversion circuit and a central processing unit; The input end of the differential input switch circuit is respectively connected to the output end of the external control circuit and the output end of the external satellite stand-alone device, and the output end of the differential input switch circuit is connected to the input end of the differential signal analog-to-digital conversion circuit; the output end of the differential signal analog-to-digital conversion circuit is connected to the central processing unit through a synchronous serial interface corresponding to a preset synchronous serial communication bus; The differential input switch circuit is used to process the analog signal output by the satellite stand-alone device under the target channel selection, and output the analog signal to the differential signal analog-to-digital conversion circuit; wherein the analog signal includes a differential analog signal and a single-ended analog signal; the target channel is the channel determined by the control circuit outputting the control signal to the differential input switch circuit for selection; the control signal includes an enable signal and a channel selection signal; The differential signal analog-to-digital conversion circuit is used to convert an analog signal into a corresponding digital signal and transmit the digital signal to the central processing unit.

2. The system according to claim 1, characterized in that The differential input switch circuit includes a first-stage differential input switch and a second-stage differential input switch; the first-stage differential input switch includes a first differential input switch and a second differential input switch, and the second-stage differential input switch includes a third differential input switch; The input end of the first differential input switch is connected to the output end of the control circuit and the output end of the satellite stand-alone device respectively, the output end of the first differential input switch is connected to the input end of the third differential input switch, and is connected to the input end of the differential signal analog-to-digital conversion circuit through the third differential input switch; The input end of the second differential input switch is respectively connected to the output end of the control circuit and the output end of the satellite stand-alone device, the output end of the second differential input switch is connected to the input end of the third differential input switch, and is connected to the input end of the differential signal analog-to-digital conversion circuit through the third differential input switch.

3. The system according to claim 2, characterized in that The first differential input switch and the second differential input switch are used to process the analog signal output by the satellite stand-alone device and output the analog signal to the third differential input switch; The third differential input switch is used to output the analog signal to the differential signal analog-to-digital conversion circuit.

4. The system according to claim 3, characterized in that The first differential input switch and the second differential input switch are first analog multiplexers, and the third differential input switch is a second analog multiplexer; the differential signal analog-to-digital conversion circuit is a high-performance analog conversion chip; The first differential input switch and the second differential input switch have a first number of single-ended analog signal input channels or a second number of pairs of differential signal input channels in total; wherein the first number is twice the second number.

5. The system according to claim 4, characterized in that The first differential input switch, the second differential input switch and the third differential input switch each include a first side output terminal and a second side output terminal, and the third differential input switch also includes a first side input terminal and a second side input terminal; the input terminal of the differential signal analog-to-digital conversion circuit includes a positive input terminal and a negative input terminal; The first side output end of the first differential input switch and / or the second differential input switch is connected to two first side input ends of the third differential input switch, and the second side output end of the first differential input switch and / or the second differential input switch is connected to one first side input end and one second side input end of the third differential input switch; wherein the first side output end and the second side output end of the first differential input switch and the second differential input switch are respectively pinched together; The first side output terminal and the second side output terminal of the third differential input switch are respectively connected to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit.

6. The system according to claim 5, characterized in that When the analog signal is the differential analog signal; a first side input terminal and a second side input terminal of the first differential input switch and / or the second differential input switch process the analog signal; wherein the first side input terminal corresponds to the second side input terminal; The first differential input switch and / or the second differential input switch are used to select the target channel according to the received enable signal and the channel selection signal, connect the first side output terminal to the two first side input terminals of the third differential input switch, and connect the second side output terminal to one first side input terminal and one second side input terminal of the third differential input switch; The third differential input switch is used to select the target channel according to the received enable signal and the channel selection signal, and connect the first side output terminal and the second side output terminal to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit respectively. The differential signal analog-to-digital conversion circuit is used to convert the differential analog signal into a corresponding digital signal and send the digital signal to the central processing unit.

7. The system according to claim 6, characterized in that When the analog signal is the single-ended analog signal, one of the first-side input terminals of the first differential input switch and / or the second differential input switch processes the analog signal; The first differential input switch and / or the second differential input switch are used to connect the first side output terminal to the two first side input terminals of the third differential input switch, and the second side output terminal to one first side input terminal and one second side input terminal of the third differential input switch when the target channel is selected; The third differential input switch is used for connecting the first side output terminal and the second side output terminal to the positive input terminal and the negative input terminal of the differential signal analog-to-digital conversion circuit respectively when the target channel is selected; wherein the positive input terminal represents the single-ended analog signal, and the negative input terminal is grounded; The differential signal analog-to-digital conversion circuit is used to convert the single-ended analog signal into a corresponding digital signal and send the digital signal to the central processing unit.

8. The system according to claim 7, characterized in that The target channel gating is determined by the following steps: In response to the target differential input switch receiving the enable signal and the channel selection signal, determining whether the enable signal is at a high level; wherein the target differential input switch is the first differential input switch and / or the second differential input switch and / or the third differential input switch; If so, determine that the target differential input switch is working normally, determine the target channel corresponding to the channel selection signal and implement the selection of the target channel; wherein the target channel includes a first side channel and a second side channel at the input end of the target differential input switch; the target differential input switch includes a third number of first side channels and second side channels; the first side channels and the second side channels correspond one to one; and the second number is twice the third number.

9. A satellite integrated electronic differential analog signal acquisition method, characterized in that: The satellite integrated electronic differential analog signal acquisition method is applied to a satellite integrated electronic differential analog signal acquisition system, the system comprising: a differential input switch circuit, a differential signal analog-to-digital conversion circuit and a central processing unit; the method comprises: The differential input switch circuit processes the analog signal output by the satellite stand-alone device under the target channel selection, and outputs the analog signal to the differential signal analog-to-digital conversion circuit; wherein the analog signal includes a differential analog signal and a single-ended analog signal; the target channel is a channel determined by the control circuit outputting a control signal to the differential input switch circuit; the control signal includes an enable signal and a channel selection signal; The differential signal analog-to-digital conversion circuit converts the analog signal into a corresponding digital signal and transmits the digital signal to the central processing unit.

10. The method according to claim 9, characterized in that The differential input switch circuit includes a first-stage differential input switch and a second-stage differential input switch; the first-stage differential input switch includes a first differential input switch and a second differential input switch, and the second-stage differential input switch includes a third differential input switch; the processing of the analog signal output by the satellite stand-alone device and outputting the analog signal to the differential signal analog-to-digital conversion circuit includes: The first differential input switch and / or the second differential input switch processes the analog signal output by the satellite stand-alone device, and outputs the analog signal to the third differential input switch; The third differential input switch outputs the analog signal to the differential signal analog-to-digital conversion circuit.

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