CN102749957A - Linear frequency modulation signal generation device for satellite borne equipment - Google Patents
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Abstract
The invention provides a linear frequency modulation signal generation device for satellite borne equipment. The linear frequency modulation signal generation device comprises a control and data generation and conversion part, a signal modulating and synthesizing part and a resetting telemetric circuit part, wherein the control and data generation and conversion part is used for generating a waveform signal of the required bandwidth and the required time width according to the protocol requirement specified by the system; the signal modulating and synthesizing part is used for synthesizing and modulating the waveform signal generated by the control and data generation and conversion part to the required central frequency; and the resetting telemetric circuit part is used for carrying out state monitoring and FPGA (Field Programmable Gate Array) reconfiguration on the control and data generation and conversion part according to the protocol requirement specified by the system. According to the linear frequency modulation signal generation device disclosed by the invention, due to the adoption of the mode that the FPGA is combined with digital-analog conversion and the design of complete three-die redundancy, the defects of a complex external interface and reduced design limitation and reliability caused by a large amount of chips are overcome and the linear frequency modulation signal generation device is suitable for different systems to flexibly generate the required waveform signal and meet the requirement on the application of the satellite borne equipment.
Description
Technical field
The present invention relates to a kind of waveform signal generation device, relate in particular to a kind of linear FM signal generation device that is used for satellite borne equipment.
Background technology
No. two satellites in ocean are ocean dynamical environment satellites, are mainly used in the monitoring of ocean dynamical environment key elements such as Ocean Wind-field, sea level height, significant wave height and SST.Therefore as spaceborne system, its volume, weight and power consumption receive very big restriction again, just require it to have characteristics such as high reliability, volume are little, in light weight, low in energy consumption for the linear FM signal generation device that can be used for satellite borne equipment.
Linear frequency modulation generation device on present most satellite borne equipment adopts the DDS special chip more.Be illustrated in figure 1 as the structural representation of an existing linear frequency modulation generation device; The advantage of this kind design is a totalizer; Look-up table and digital analog converter (D/A) have been integrated in the chip; Only setpoint frequency control word and amplitude information etc. just can be realized as requested, and DDS is a special chip but the thing followed is, parameters such as the version of internal circuit and D/A converter figure place have configured; When using the DDS special chip, to adapt to the function that it can be realized, can not go adjustment according to demand; The DDS special chip is through frequency and phase-accumulated two totalizer modes are realized linear frequency modulation, and this mode is relatively complicated, controlled frequency word and pace of change etc.; Because satellite borne equipment is very high to reliability requirement, and the DDS special chip of high-performance high reliability becomes the focus of concern, and existing chip often is a plastic device, the technology of adaptation different system and the requirement of reliability had significant limitation in addition.
The mode that the present invention has adopted FPGA, triplication redundancy and reset circuit to combine has well solved this problem, has obtained high reliability.
Summary of the invention
The objective of the invention is to,, the invention provides a kind of linear FM signal generation device that is used for satellite borne equipment in order to solve the problem of above-mentioned linear FM signal generation device.
The present invention provides a kind of linear FM signal generation device that can be used for satellite borne equipment, can carry out choosing and independent assortment on the device according to the demand of system on the one hand, on the other hand can be according to required generation digital waveform signal.
To achieve these goals, the invention provides a kind of linear FM signal generation device that is used for satellite borne equipment, it is characterized in that said device comprises:
Control and data produce change-over circuit, and the triggering and the bandwidth that are used to receive input are selected signal and generated the required bandwidth and the wide waveform signal that takes according to agreement, and this waveform signal is as modulated signal;
Signal modulation combiner circuit, the local oscillation signal that is used to receive input produce synthetic being modulated on this carrier frequency of waveform signal that conversion portion generates as carrier frequency with said control and data; With
The telemetric circuit that resets is used for according to protocol requirement control and data being produced conversion portion and carries out status monitoring and reshuffle;
Wherein, the input end of the said telemetric circuit that resets and bandwidth select signal to be connected, and are used to produce make the FPGA reset signal of downloaded software again;
The said telemetric circuit output terminal that resets is connected with another input end that said control and data produce change-over circuit; The output terminal that said control and data produce change-over circuit is connected with the input end of said signal modulation combiner circuit; Said signal modulation combiner circuit receives the local oscillation signal of input and the waveform signal of importing it is modulated, and the output terminal of this signal modulation combiner circuit is as the output terminal of linear FM signal generation device.
In the technique scheme, said control and data produce change-over circuit through in FPGA, adopting a kind of two methods that add up, produce different bandwidth with the time wide digital chirp signal, through the logical combination of bandwidth selection signal, export required waveform signal.
In the technique scheme, said control and data produce conversion portion and further comprise: data waveform produces circuit, program storage, two digital analog converters, two transformers and two low-pass filters; Wherein:
Said digital waveform produces circuit and realizes based on field programmable gate array, and it further comprises successively and being connected in series: counter, set the counter initial value, and count with stepping 2, obtain output valve A=A+2; Totalizer adds up to the output data of counter, obtains accumulated value C=C+A; Lut circuits is searched the C value corresponding from the Sine-Cosine look-up table, obtain the corresponding digital waveform signal.
Two output terminals of said field programmable gate array are connected in series with said digital to analog converter, transformer and low-pass filter successively; Its input end selects signal to be connected with said program storage, clock signal, triggering and bandwidth, and program storage is used to store FPGA software; Clock signal is the required service frequency signal of FPGA; When receiving trigger pip, the inner digital signal that produces timing control signal and required waveform of FPGA; Through bandwidth being selected the interpretation of signal logic combination, confirm that the bandwidth of required output waveform signals or generation make the FPGA reset signal of downloaded software again.
In the technique scheme, said program storage can use PROM or E
2PROM, its capacity is decided according to selected field programmable gate array model;
Said digital analog converter is decided according to required bandwidth of reality and accuracy requirement;
Said low-pass filter adopts the phase equalization design, to guarantee the phase linearity of output signal.
Optimize, said FPGA input and output pin and internal software all adopt the triplication redundancy design.
In the technique scheme, the said telemetric circuit that resets further comprises: reset circuit and house dog;
Said reset circuit; Being used for carrying out program according to the FPGA that agreement produces change-over circuit to said control and data downloads again; When the program work abnormal state, pass through this reset circuit on the one hand; Make said control and data produce change-over circuit as early as possible and recover operate as normal, the mode that resets through regular use on the other hand reaches primary particle inversion resistant purpose;
Said house dog telemetric circuit is used to produce Monitoring and Controlling and data and produces the change-over circuit working state signal.
In the technique scheme, said signal modulation combiner circuit further comprises modulator and the BPF. that is connected in series successively;
The input end of said modulator is used to receive the output waveform signals of said control and data generation change-over circuit, with local oscillation signal mixing and the output of this waveform signal with this modulator of input;
The input end of said BPF. links to each other with the output terminal of said modulator, and its output terminal is as the output terminal of this signal modulation combiner circuit.
Compared with prior art, a kind of linear FM signal generation device that can be used for satellite borne equipment of the present invention, it is very high to be applicable to that system reliability requires, and simultaneously weight, volume, power consumption is had the system of certain limitation again.In order to satisfy many-sided requirement, do not use the design of general linear FM signal generation device, avoided its very flexible and the low shortcoming of reliability, thereby made linear frequency modulation generation device simplified design as far as possible when reaching system reliability and requiring.The present invention is through the mode taking field programmable gate array (FPGA) and digital-to-analogue conversion and combine and the design of triplication redundancy; The limitation of design that complicated external interface and a large amount of chips are brought and the shortcoming of reliability reduction had both been avoided; Be applicable to that again different system produces the demand of required waveform signal flexibly, makes the weight and volume of system alleviate again simultaneously.Be that the present invention has improved reliability greatly through the complete triplication redundancy design of adopting FPGA, FPGA input and output pin and software and the mode that the FPGA reset circuit combines.This device produces the demand of required waveform signal and the requirement of reliability flexibly applicable to different system.
Description of drawings
Fig. 1 is existing a kind of structural representation that can be used for the linear FM signal generation device of satellite borne equipment;
Fig. 2 is the block diagram that expression a kind of linear FM signal generation device that can be used for satellite borne equipment of the present invention is formed;
Fig. 3 constitutes the control of a kind of linear FM signal generation device that can be used for satellite borne equipment of the present invention and the structural drawing that data produce change-over circuit;
Fig. 4 constitutes the structural drawing that a kind of signal that can be used for the linear FM signal generation device of satellite borne equipment of the present invention is modulated combiner circuit;
Fig. 5 is the structural drawing that constitutes the telemetric circuit that resets of a kind of linear FM signal generation device that can be used for satellite borne equipment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and practical implementation example the linear FM signal generation device that can be used for satellite borne equipment of the present invention is carried out detailed explanation.
The invention provides a kind of linear FM signal generation device that can be used for satellite borne equipment.This device comprises: control and data produce conversion portion, signal modulation composite part and the telemetric circuit part that resets, and are said: control and data produce the protocol requirement of conversion portion according to system's regulation, generate the required bandwidth and the wide waveform signal that takes; Said signal modulation composite part produces the waveform signal that conversion portion generates with said control and data, synthetic being modulated on the needed centre frequency; The said telemetric circuit part of resetting produces to control and data according to the protocol requirement of system's regulation that conversion portion carries out status monitoring and FPGA reshuffles.The present invention is through the mode taking field programmable gate array (FPGA) and digital-to-analogue conversion and combine and the design of triplication redundancy; The shortcoming of both having avoided limitation of design that complicated external interface, a large amount of chip brought and reliability to reduce; Be applicable to that again different system produces the requirement of required waveform signal flexibly, makes the weight and volume of equipment alleviate again simultaneously.
In the such scheme, said control and data produce conversion portion through in FPGA, produce different bandwidth and the time wide digital chirp signal, the digital waveform production method of this FM signal comprises following steps:
1) suppose the counting figure place n of counter, wherein B is a bandwidth, and is wide when T is, F is a clock signal, according to
The B that agreement provides, T and F value just can obtain the figure place n that counter need be set with following formula:
2
n=F
2*T/B；
2) initial value of computing counter:
The * F*T+1 of initial value=(F/B-1);
3) counter is provided with according to initial value, counts with stepping 2, obtains exporting A=A+2 as a result;
4) totalizer adds up according to the figure place of the counter output data to counter, obtains accumulated value
C=C+A；
5) from the Sine-Cosine look-up table, search the C value corresponding, obtain the corresponding digital waveform signal.
In the such scheme; Said control and data produce conversion portion mainly by; Digital waveform signal produces circuit (and this circuit adopts field programmable gate array (FPGA) to realize), program storage, digital analog converter; Transformer and low-pass filter are accomplished, and wherein: the fpga chip that said FPGA can adopt different model according to the function and the data volume of its required completion, said program storage can use PROM or E
2PROM, its capacity is decided according to selected FPGA, and said digital analog converter can be decided according to required bandwidth and accuracy requirement, and said low-pass filter adopts the phase equalization design, to guarantee the phase linearity of output signal.
In the such scheme, FPGA input and output pin and FPGA in house software all adopt the triplication redundancy design in said control and the data generation conversion portion, have effectively realized anti-single particle overturn.
In the such scheme, said signal modulation composite part comprises modulator and BPF., and BPF. adopts the phase equalization design, to guarantee the phase linearity of output signal.
In the such scheme; The said telemetric circuit part that resets; Can FPGA be carried out program download again according to the protocol requirement of system regulation, take place to make system recovery work as soon as possible when unusual in program on the one hand; Regularly use the mode that resets on the other hand, also can reach primary particle inversion resistant purpose.
In the such scheme, the said telemetric circuit part of resetting further comprises the house dog telemetric circuit, flies to prevent that software from running, thereby takes place can in time produce alerting signal when unusual in program.
Fig. 2 is the block diagram that expression linear FM signal generation device of the present invention is formed; Fig. 3 constitutes the control of linear FM signal generation device of the present invention and the structural drawing that data produce change-over circuit; Fig. 4 is the structural drawing that constitutes the signal modulation combiner circuit of linear FM signal generation device of the present invention, and Fig. 5 is the structural drawing that constitutes the telemetric circuit that resets of linear FM signal generation device of the present invention.Shown in Fig. 2～5, the linear FM signal generation device that originally can be used for satellite borne equipment produces conversion portion by control and data, and signal modulation composite part is partly formed with the telemetric circuit that resets.Wherein, control and data produce conversion portion to be made up of the FPGA system, major function be according to the generation different bandwidth of bandwidth selection signal and the time wide digital chirp signal; Signal modulation composite part mainly is made up of wave filter and modulator, and the signal that its effect will be controlled exactly and data generation conversion portion generates is modulated on the needed centre frequency; The telemetric circuit that resets part is carried out status monitoring and is resetted control and data unit according to the protocol requirement of system's regulation.Originally the linear FM signal generation device that can be used for satellite borne equipment is applicable to that different system produces the demand of required waveform signal flexibly.
As shown in Figure 3, the control of linear FM signal generation device of the present invention and data produce change-over circuit by FPGA, digital analog converter, and transformer and low-pass filter are formed, and the core of this part is FPGA, is equipped with program storage.Wherein FPGA can adopt the FPGA of different model according to the function of its required completion; Program storage both can use PROM, can use E again
2PROM, capacity is decided according to selected FPGA.Said digital analog converter can be decided according to required bandwidth and accuracy requirement.Low-pass filter has adopted the phase equalization design, to guarantee the phase linearity of output signal.Through in FPGA, adopting a kind of two methods that add up, produce different bandwidth and the time wide digital chirp signal.FPGA input and output pin and FPGA in house software have all adopted the triplication redundancy design, have effectively realized anti-single particle overturn.
As shown in Figure 4, the one other component of this device can be used for the signal modulation combiner circuit of the linear FM signal generation device of satellite borne equipment and mainly is made up of modulator and BPF..BPF. has adopted the phase equalization design, to guarantee the phase linearity of output signal.
As shown in Figure 5, the one other component of this device can be used for the telemetric circuit that resets of the linear FM signal generation device of satellite borne equipment and mainly is made up of gate circuit and house dog.Through the house dog telemetric circuit, can Monitoring and Controlling and data produce the change-over circuit duty, when taking place to produce alerting signal when unusual.Can carry out program to FPGA through reset circuit according to system protocol downloads again; When the program work abnormal state, can pass through reset circuit on the one hand; Make the system recovery operate as normal as early as possible, the mode that also can reset through regular use on the other hand reaches primary particle inversion resistant purpose.
According to above-mentioned design, according to the time wide 102.4us and the 12.8us of being respectively, bandwidth is respectively 80MHz, the requirement of 20MHz and 5MHz has carried out producing the design of linear FM signal, we have write corresponding program.Through the full test to software and hardware, system requirements is satisfied in design, has verified said design proposal in orbit.
Table 1 has provided the comparison of two kinds of scheme each item characteristics.
Table 1:
In sum; Can find out the linear FM signal generation device that can be used for satellite borne equipment of the present invention, can carry out choosing and independent assortment on the device according to the demand of system on the one hand, can pass through the software programming of field programmable gate array (FPGA) on the other hand; Produce needed digital waveform signal neatly; In the requirement of satisfying spaceborne system high reliability, the dirigibility of hardware device is strengthened greatly, has the very high adaptability for different application systems simultaneously again; Be a kind of linear FM signal generation device, satisfied many-sided demand of spaceborne system with optimal design of novelty.
In addition; The linear FM signal generation device that can be used for satellite borne equipment of the present invention has extensibility; Can be according to the different model task; Change amount of capacity, digital-to-analog conversion speed and figure place, the bandwidth of wave filter and the centre frequency of modulator of FPGA, can adapt to the real needs of different task.
Need to prove, embodiment of the present invention of more than introducing and and unrestricted.It will be understood by those of skill in the art that any modification to technical scheme of the present invention perhaps is equal to alternative spirit and the scope that does not break away from technical scheme of the present invention, it all should be encompassed in the claim scope of the present invention.
Claims (7)
1. linear FM signal generation device that is used for satellite borne equipment is characterized in that said device comprises:
Control and data produce change-over circuit, and the triggering and the bandwidth that are used to receive input are selected signal and generated the required bandwidth and the wide waveform signal that takes according to agreement, and this waveform signal is as modulated signal;
Signal modulation combiner circuit, the local oscillation signal that is used to receive input produce synthetic being modulated on this carrier frequency of waveform signal that conversion portion generates as carrier frequency with said control and data; With
The telemetric circuit that resets is used for according to protocol requirement control and data being produced conversion portion and carries out status monitoring and reshuffle;
Wherein, the input end of the said telemetric circuit that resets and bandwidth select signal to be connected, and are used to produce make the FPGA reset signal of downloaded software again;
The said telemetric circuit output terminal that resets is connected with another input end that said control and data produce change-over circuit; The output terminal that said control and data produce change-over circuit is connected with the input end of said signal modulation combiner circuit; Said signal modulation combiner circuit receives the local oscillation signal of input and the waveform signal of importing it is modulated, and the output terminal of this signal modulation combiner circuit is as the output terminal of linear FM signal generation device.
2. the linear FM signal generation device that is used for satellite borne equipment according to claim 1; It is characterized in that; Said control and data produce change-over circuit through in FPGA, adopting two methods that add up; Produce different bandwidth with the time wide digital chirp signal, through the logical combination of bandwidth selection signal, export required waveform signal.
3. the linear FM signal generation device that is used for satellite borne equipment according to claim 2; It is characterized in that; Said control and data produce conversion portion and further comprise: data waveform produces circuit, program storage, two digital analog converters, two transformers and two low-pass filters; Wherein:
Said digital waveform produces circuit and realizes based on field programmable gate array, and it further comprises successively and being connected in series: counter, set the counter initial value, and count according to stepping 2, obtain output valve A=A+2; Totalizer adds up to the output data of counter, obtains accumulated value C=C+A; Lut circuits is searched the C value corresponding from the Sine-Cosine look-up table, obtain the corresponding digital waveform signal;
Two output terminals of said field programmable gate array are connected in series with said digital to analog converter, transformer and low-pass filter successively; Its input end selects signal to be connected with said program storage, clock signal, triggering and bandwidth, and program storage is used to store FPGA software; Clock signal is the required service frequency signal of FPGA; When receiving trigger pip, the inner digital signal that produces timing control signal and required waveform of FPGA; Through bandwidth being selected the interpretation of signal logic combination, confirm that the bandwidth of required output waveform signals or generation make the FPGA reset signal of downloaded software again.
4. the linear FM signal generation device that is used for satellite borne equipment according to claim 2 is characterized in that said program storage can use PROM or E
2PROM, its capacity is decided according to selected field programmable gate array model;
Said digital analog converter is decided according to required bandwidth of reality and accuracy requirement;
Said low-pass filter adopts the phase equalization design, to guarantee the phase linearity of output signal.
5. according to claim 2 or the 3 described linear FM signal generation devices that are used for satellite borne equipment, it is characterized in that said FPGA input and output pin and internal software all adopt the triplication redundancy design.
6. the linear FM signal generation device that is used for satellite borne equipment according to claim 2 is characterized in that the said telemetric circuit that resets further comprises: reset circuit and house dog;
Said reset circuit; Being used for carrying out program according to the FPGA that agreement produces change-over circuit to said control and data downloads again; When the program work abnormal state, pass through this reset circuit on the one hand; Make said control and data produce change-over circuit as early as possible and recover operate as normal, the mode that resets through regular use on the other hand reaches primary particle inversion resistant purpose;
Said house dog telemetric circuit is used to produce Monitoring and Controlling and data and produces the change-over circuit working state signal.
7. the linear FM signal generation device that is used for satellite borne equipment according to claim 1 is characterized in that, said signal modulation combiner circuit further comprises modulator and the BPF. that is connected in series successively;
The input end of said modulator is used to receive the output waveform signals of said control and data generation change-over circuit, with local oscillation signal mixing and the output of this waveform signal with this modulator of input;
The input end of said BPF. links to each other with the output terminal of said modulator, and its output terminal is as the output terminal of this signal modulation combiner circuit.
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| CN104267385A (en) * | 2014-10-16 | 2015-01-07 | 中国科学院电子学研究所 | Linear frequency-modulated signal generator with predistortion function |
| CN108872951A (en) * | 2017-05-12 | 2018-11-23 | 比亚迪股份有限公司 | The modulator approach and modulating system of automobile and automobile fmcw radar |
| CN114858154A (en) * | 2022-03-30 | 2022-08-05 | 北京控制工程研究所 | System and method for realizing high-reliability fiber optic gyroscope eigenfrequency by utilizing triple-mode redundancy |
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| CN114858154A (en) * | 2022-03-30 | 2022-08-05 | 北京控制工程研究所 | System and method for realizing high-reliability fiber optic gyroscope eigenfrequency by utilizing triple-mode redundancy |
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| CN102749957B (en) | 2015-04-15 |
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