CN113124858A - Airborne magnetic sensor course signal digitization method - Google Patents
Airborne magnetic sensor course signal digitization method Download PDFInfo
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- CN113124858A CN113124858A CN202110267210.7A CN202110267210A CN113124858A CN 113124858 A CN113124858 A CN 113124858A CN 202110267210 A CN202110267210 A CN 202110267210A CN 113124858 A CN113124858 A CN 113124858A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/04—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by terrestrial means
- G01C21/08—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by terrestrial means involving use of the magnetic field of the earth
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Abstract
The invention provides a method for digitizing heading signals of an airborne magnetic sensor, which comprises the following steps that the signals output by three-phase measuring elements 3, 4 and 5 of the magnetic heading signals are 800Hz signals, the signals are firstly converted into 400Hz self-angle machine signals, and finally the 400Hz self-angle machine signals are converted through a digital conversion circuit. The invention can directly utilize computer technology to carry out digital display and processing, and realizes real-time digital processing on the magnetic heading signal output by the airborne GHC-X series magnetic sensor.
Description
Technical Field
The invention relates to the technical field of course signal digitization, in particular to a method for digitizing a course signal of an airborne magnetic sensor.
Background
During the flight of the aircraft, the magnetic heading is the angle between the longitudinal axis of the aircraft and the magnetic meridian of the earth in the horizontal plane. At present, the main equipment for measuring magnetic heading is a GHC-X series magnetic sensor, during the working process, magnetizing coils 1 and 2 are wound on six sides of a regular hexagon and are sequentially connected, 400Hz and 1.7V alternating current are supplied, measuring coils 3, 4 and 5 are uniformly wound outside the magnetizing coils, each two opposite sides form a group, two opposite sides are reversely connected in series, the three groups are connected in a star shape, and the output ends 3, 4 and 5 of the three-phase measuring coils output three-phase earth magnetic induction potential outwards.
At present, a follow-up system is mainly used for measuring three-phase induced potential, and due to the low precision and poor universality of the follow-up system, the follow-up system is difficult to directly use a computer technology to carry out digital display and processing, and increasingly cannot meet the use requirements.
Disclosure of Invention
In view of this, the invention provides a method for digitizing a heading signal of an airborne magnetic sensor, so as to implement real-time digital processing on a magnetic heading signal output by an airborne GHC-X series magnetic sensor.
In order to solve the technical problem, the invention provides a method for digitizing a heading signal of an airborne magnetic sensor, which comprises the following steps:
the signals output by the three-phase magnetic heading signal measuring elements 3, 4 and 5 are 800Hz signals, and are firstly converted into 400Hz self-angle machine signals, and finally the 400Hz self-angle machine signals are converted through a digital conversion circuit.
Furthermore, the geomagnetic sensor measuring coils 3, 4 and 5 are connected into a three-phase stator coil of an input synchronizer, when the heading of the aircraft changes, signals of the measuring coils 3, 4 and 5 change, the synthesized magnetic flux of the three-phase stator coil of the input synchronizer changes accordingly, 800Hz induction potential is generated in a rotor of the input synchronizer, and the induction potential is converted into a 400Hz signal after passing through a chopper amplifier and then is input into a servo motor.
Furthermore, the servo motor drives the rotor of the synchro to rotate, simultaneously, signals which change along with the rotor are generated in the three-phase stator of the synchro, the servo motor also drives the rotor of the input synchronizer to rotate, when the synthetic magnetic flux of the three-phase stator coil of the input synchronizer is vertical to the rotor of the input synchronizer, the output signal of the rotor of the input synchronizer is zero, the motor stops rotating, and the signals of the measuring coils 3, 4 and 5 of the geomagnetic sensor are converted into the signals of the stators 3', 4' and 5' of the synchro.
Further, the chopper amplifier comprises an 800Hz preamplifier, a demodulator, a corrector, a modulator and a 400Hz alternating current amplifier which are sequentially connected, the demodulator is further sequentially connected with an amplitude limiter and a frequency multiplier, and the modulator is further connected with a phase-shifting amplitude limiter.
Furthermore, the digital conversion circuit comprises a 14ZSZ3413 chip, a tristate latch and a monostable circuit, the stators 3', 4' and 5' of the synchro are connected with the interfaces S1, S2 and S3 of the 14ZSZ3413 chip, the BUSY interface of the 14ZSZ3413 chip is used as a latch pulse of input data of the tristate latch after being subjected to phase inversion and delay through the monostable circuit, and the latch pulse is added to the input data of the tristate latch
The external disable signal at terminal is applied to an input terminal of the tristate latch.
Further, the tri-state latch comprises LS 173.
Further, the one-shot circuit includes LS 123.
The technical scheme of the invention has the following beneficial effects:
the signals output by the three-phase magnetic heading signal measuring elements 3, 4 and 5 are 800Hz signals which cannot be directly converted into digital signals, and are firstly converted into 400Hz selsyn signals.
The geomagnetic sensor measuring coils 3, 4 and 5 are connected to the three-phase stator coil of the input synchronizer. When the heading of the aircraft changes, signals of the measuring coils 3, 4 and 5 change, the synthetic magnetic flux of the three-phase stator coil input into the synchronizer changes, and 800Hz induction potential is generated in the rotor input into the synchronizer. The induced potential is converted into a 400Hz signal after passing through a chopper amplifier and is input into a servo motor. The servo motor drives the rotor of the synchro to rotate, and simultaneously, signals which change along with the rotor are generated in the three-phase stator of the synchro to represent the geomagnetic heading change angle. The servo motor also drives the rotor of the input synchronizer to rotate, when the synthetic magnetic flux of the three-phase stator coil of the input synchronizer is vertical to the rotor of the input synchronizer, the output signal of the rotor of the input synchronizer is zero, and the motor stops rotating. Thus, the signals of the geomagnetic sensor measurement coils 3, 4, 5 are converted into signals of the synchro stators 3', 4', 5 '.
The digital conversion of the signals of the synchro adopts a 14ZSZ3413 chip, the digital output of the chip is 14 bits, and the precision reaches +/-4.5 angular divisions. The synchro stators 3', 4', 5' are connected to chips S1, S2, S3. The latch pulse of BUSY after single stable (LS123) phase inversion and delay is added to the input data of the tristate latch (LS173)
The external disable signal at terminal is applied to an input of LS123 and functions to prevent BUSY from outputting an incoming pulse through LS123 to LS173, thereby causing the contents of the latch to remain in place
The latch content at the moment of switching from high level to low level, on the other hand, the inner tracking loop can be prevented from being adversely affected by open loop to non-tracking state.
The invention can directly utilize computer technology to carry out digital display and processing, and realizes real-time digital processing on the magnetic heading signal output by the airborne GHC-X series magnetic sensor.
Drawings
FIG. 1 is a magnetic navigation chart measured by a three-phase geomagnetic induction element according to the present invention;
FIG. 2 is a diagram of the method of converting 800Hz to a selsyn signal according to the present invention;
FIG. 3 is a schematic diagram of a chopper amplifier of the present invention;
fig. 4 is a schematic circuit diagram of the digital conversion circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 4 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in fig. 1-4: the embodiment provides a method for digitizing a heading signal of an airborne magnetic sensor, which comprises the following steps:
the signals output by the three-phase magnetic heading signal measuring elements 3, 4 and 5 are 800Hz signals, and are firstly converted into 400Hz self-angle machine signals, and finally the 400Hz self-angle machine signals are converted through a digital conversion circuit.
According to one embodiment of the present invention, as shown in figures 1-4,
the geomagnetic sensor measuring coils 3, 4 and 5 are connected into an input synchronizer three-phase stator coil, when the heading of the aircraft changes, signals of the measuring coils 3, 4 and 5 change, the synthesized magnetic flux of the input synchronizer three-phase stator coil changes accordingly, 800Hz induction potential is generated in an input synchronizer rotor, and the induction potential is converted into a 400Hz signal after passing through a chopper amplifier and then is input into a servo motor.
The servo motor drives the rotor of the synchro to rotate, meanwhile, signals which change along with the rotor are generated in the three-phase stator of the synchro, the servo motor also drives the rotor of the input synchronizer to rotate, when the synthetic magnetic flux of the three-phase stator coil of the input synchronizer is vertical to the rotor of the input synchronizer, the output signal of the rotor of the input synchronizer is zero, the motor stops rotating, and the signals of the measuring coils 3, 4 and 5 of the geomagnetic sensor are converted into the signals of the stators 3', 4' and 5' of the synchro.
According to one embodiment of the present invention, as shown in figures 1-4,
the chopper amplifier comprises an 800Hz preamplifier, a demodulator, a corrector, a modulator and a 400Hz alternating current amplifier which are sequentially connected, the demodulator is further sequentially connected with an amplitude limiter and a frequency multiplier, and the modulator is further connected with a phase-shifting amplitude limiter.
The 800Hz preamplifier is weak (about 2-3 mv/degree) to the signal input to the synchronizer rotor output, and this weak 800Hz signal must be pre-amplified by the 800Hz ac amplifier in order for the demodulator to operate properly. The demodulator is used for demodulating an alternating current signal input by the 800Hz alternating current amplifier into a pulsating direct current signal. The filter is that the pulsating direct current output by the demodulator is changed into smooth direct current and then output to the corrector. The corrector forms a passive differential correction network, carries out advanced phase shift on signals and has the function of increasing damping so as to improve the stability of the system. The amplitude limiter is a bidirectional amplitude limiter, so that the amplitudes of direct current signals in positive and negative directions added to the modulator are equal, and positive and negative errors caused by asymmetrical output of the demodulator are avoided. The modulator adjusts the dc to a pulsating dc at 400 Hz. The 400Hz AC amplifier is used to amplify the 400Hz signal from the modulator and the output is applied directly to the servo motor.
In one embodiment of the present invention, as shown in figures 1-4,
the digital conversion circuit comprises a 14ZSZ3413 chip, a tristate latch and a monostable circuit, the stators 3', 4', 5' of the synchro are connected with S1, S2 and S3 interfaces of the 14ZSZ3413 chip, the BUSY interface of the 14ZSZ3413 chip is used as a latch pulse of input data of the tristate latch after being inverted and delayed by the monostable circuit, and an external inhibit signal applied to the end is changed to one input end of the tristate latch.
The tristate latch comprises LS 173.
The monostable circuit includes LS 123.
The 14ZSZ3413 chip produced by the seventh and sixth research institute of the ship reworking group in the digital conversion of the signals of the synchro outputs 14 bits digitally, and the precision reaches +/-4.5 angular points. The synchro stators 3', 4', 5' are connected to chips S1, S2, S3. The latch pulse of BUSY after single stable (LS123) phase inversion and delay is added to the input data of the tristate latch (LS173)
The external disable signal at terminal is applied to an input of LS123 and functions to prevent BUSY from outputting an incoming pulse through LS123 to LS173, thereby causing the contents of the latch to remain in place
The latch content at the moment of switching from high level to low level, on the other hand, the inner tracking loop can be prevented from being opened to be not followedThe adverse effect of the tracking state.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for digitalizing heading signals of an airborne magnetic sensor is characterized by comprising the following steps: the method comprises the following steps:
the signals output by the three-phase magnetic heading signal measuring elements 3, 4 and 5 are 800Hz signals, and are firstly converted into 400Hz self-angle machine signals, and finally the 400Hz self-angle machine signals are converted through a digital conversion circuit.
2. The method of digitizing an airborne magnetic sensor heading signal of claim 1, wherein: the geomagnetic sensor measuring coils 3, 4 and 5 are connected into an input synchronizer three-phase stator coil, when the heading of the aircraft changes, signals of the measuring coils 3, 4 and 5 change, the synthesized magnetic flux of the input synchronizer three-phase stator coil changes accordingly, 800Hz induction potential is generated in an input synchronizer rotor, and the induction potential is converted into a 400Hz signal after passing through a chopper amplifier and then is input into a servo motor.
3. The method of digitizing an airborne magnetic sensor heading signal of claim 2, wherein: the servo motor drives the rotor of the synchro to rotate, meanwhile, signals which change along with the rotor are generated in the three-phase stator of the synchro, the servo motor also drives the rotor of the input synchronizer to rotate, when the synthetic magnetic flux of the three-phase stator coil of the input synchronizer is vertical to the rotor of the input synchronizer, the output signal of the rotor of the input synchronizer is zero, the motor stops rotating, and the signals of the measuring coils 3, 4 and 5 of the geomagnetic sensor are converted into the signals of the stators 3', 4' and 5' of the synchro.
4. The method of digitizing an airborne magnetic sensor heading signal of claim 3, wherein: the chopper amplifier comprises an 800Hz preamplifier, a demodulator, a corrector, a modulator and a 400Hz alternating current amplifier which are sequentially connected, the demodulator is further sequentially connected with an amplitude limiter and a frequency multiplier, and the modulator is further connected with a phase-shifting amplitude limiter.
5. The method of digitizing an airborne magnetic sensor heading signal of claim 4, wherein: the digital conversion circuit comprises a 14ZSZ3413 chip, a tristate latch and a monostable circuit, the stators 3', 4', 5' of the synchro are connected with the interfaces S1, S2 and S3 of the 14ZSZ3413 chip, the BUSY interface of the 14ZSZ3413 chip is used as a latch pulse of the input data of the tristate latch after being inverted and delayed by the monostable circuit, and the latch pulse is added to the input data of the tristate latchINHThe external disable signal at terminal is applied to an input terminal of the tristate latch.
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Cited By (1)
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| CN113824234A (en) * | 2021-10-09 | 2021-12-21 | 上海赢双电机有限公司 | Winding for reluctance type synchro and winding method thereof |
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