CN1088186C - Electronic compass - Google Patents
Electronic compass Download PDFInfo
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- CN1088186C CN1088186C CN 98113806 CN98113806A CN1088186C CN 1088186 C CN1088186 C CN 1088186C CN 98113806 CN98113806 CN 98113806 CN 98113806 A CN98113806 A CN 98113806A CN 1088186 C CN1088186 C CN 1088186C
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- compass
- electronic compass
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Abstract
The present invention relates to an electronic repeater compass. The present invention is characterized in that the electronic repeater compass is composed of a signal attenuation circuit, an isolating circuit, a measuring circuit and a digital display, wherein the signal attenuation circuit processes exciting signals and synchronous signals or staircase signals received from a master compass through an interface; the isolating circuit is connected with an output end of the signal attenuation circuit and prevents interfering signals from entering a system; the measuring circuit converts the signals from the signal attenuation circuit and the isolating circuit into standard TTL level and processes data. The present invention has the advantages of small size, light weight and low price.
Description
The present invention relates to marine navigation equipment.
Compass is boats and ships are determined its course in boundless sea a key instrument.But the course information of compass will be shown by its repeater compass usually.
The repeater compass that uses all is pointer at present, and promptly the signal that is sent by cable is electrical signal conversion the mechanical angle signal through selsyn or stepper motor, drives the pointer rotation through gear drive again, indicates the current course of boats and ships.The shortcoming of this repeater compass is that volume is big, Heavy Weight, and the price height is installed also inconvenient.
The purpose of this invention is to provide a kind of electronic type repeater compass that does not have the machinery part.
The object of the present invention is achieved like this: a kind of electronic compass, it is characterized in that it is by to receiving the signal conditioning circuit that the master compass excitation signal come and synchronizing signal or stairstep signal are handled from interface, being connected with the output terminal of signal conditioning circuit prevents that undesired signal from entering the buffer circuit of system, makes the signal of coming through buffer circuit become metering circuit and digital display circuit four parts that standard Transistor-Transistor Logic level signal carries out data processing and forms; Said signal conditioning circuit is made of divider resistance and ∏ mode filter or Γ mode filter.
Said buffer circuit is to adopt photoelectricity to isolate to realize; Said metering circuit adopts microcomputer to realize.
The employed software of microcomputer in the said microcomputer measurement circuit be adopt that discrepancy in elevation criterion realizes promptly before and after absolute value 〉=1 of double sampling value difference.
Good effect of the present invention:
Because electronic compass does not have mechanical part,, can be installed in required place arbitrarily so volume is little, in light weight, cheap.
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is signal processing circuit figure of the present invention.
Fig. 3 realizes software program flow process block diagram of the present invention.
Fig. 4 is a decoding operation program block diagram.
Below in conjunction with accompanying drawing the present invention is described in further details.
In the structured flowchart of Fig. 1, what frame of broken lines was outer is master compass signal 1, it can be that synchronizing signal also can be a stairstep signal, receive the signal conditioning circuit 2 that the signal that comes at first enters electronic compass from master compass, in order to prevent that the external interference signal from entering in the system, also be provided with buffer circuit 3, it links to each other with the output terminal of modulate circuit.The master compass signal of handling through modulate circuit of coming through buffer circuit is carried out the shaping processing, and promptly signal transformation circuit 4.The signal of handling through shaping circuit becomes the Transistor-Transistor Logic level gray code signal of standard, and it is sent into the metering circuit 5 of carrying out data processing, and the metering circuit among the present invention adopts microcomputer to realize.What the output signal of metering circuit was shown is digital display circuit 6.
The signal processing circuit of Fig. 2 comprises: signal conditioning circuit, signal isolation circuit and signal transformation circuit.From the type of signal, it comprises synchronization signal processing, to the processing of stairstep signal with to these three kinds of signal paths of processing of excitation signal.Because synchronizing signal and stairstep signal all are three-phases, so only narrate mutually with regard to one when explanation, surplus person is identical.
Wherein J1 is the data interface circuit of master compass and repeater compass, and D1, D4, R1, R5, R8, D7 are the circuitry phase in the three-phase stairstep signal modulate circuit.As stairstep signal is positive pulse, and this signal is through R1, R5, R8 dividing potential drop, and the voltage on the R8 is exported through D4 again.As stairstep signal is negative pulse, and then this signal is through R1, R5, R8 dividing potential drop, and the voltage on the R5 is exported through D1 again.The output signal of modulate circuit is passed through buffer circuit after D7 further decays---photoelectricity is isolated U1---sends into logic switch U6 shaping output.L1 in this road, C1 are the Γ mode filter.
R34, R14 and D13 have constituted the decay to excitation signal, also finished simultaneously half-wave rectification,---photoelectricity isolation U2---inserts the end of shaping circuit U4:A to the signal that comes out through the decay rectification through buffer circuit, U4:A is connected into the homophase shaping circuit, the output of U4:A is added to the end of U4:B---5 pin again, U4:A output low level when excitation signal is positive half cycle, U4:A was output as high level when excitation signal was negative half period.
R37, R11 and D10 are phases that constitutes in the three-phase synchronous signal modulate circuit, the effect that also has half-wave rectification simultaneously.The other end that---photoelectricity is isolated U2---is added to U4:B after decay and half-wave rectification, through buffer circuit from the synchronizing signal of selsyn is 4 pin.4 pin of U4:B were low level when synchronizing signal was positive half cycle, and 4 pin of U4:B were high level when synchronizing signal was negative half period.When synchronizing signal and excitation signal are same phase time, U4:B exports high level, when anti-phase, and the U4:B output low level.Send into logic switch U6 again through the ∏ shape filtering circuit of R15, R16, C12 formation and the positive feedback shaping circuit of U5:A and R21 formation.
Realization of the present invention also is furnished with corresponding software except above-mentioned hardware circuit, promptly give up the throne or the judgement of carry to the logical signal behind sampled signal coded combination decoding computing is resulting.But in order to improve the speed of measured signal, the present invention adopts discrepancy in elevation criterion, i.e. absolute value 〉=1 of front and back double sampling value difference.
Fig. 3 is a program flow chart.
From the electric signal of master compass after interface circuit is handled, the Transistor-Transistor Logic level signal that becomes standard is sent into microcomputer, through data sampling 9, reassemble into relative angle value and the carry or the signal of giving up the throne of Gray code representative, and forms accordingly definitely the course by the initial angle value superposition of keyboard input when the initialization and send into data display circuit.
Fig. 4 is the flow chart of decoding computing.
Synchronizing signal or stairstep signal from master compass are a relative course signal, and the fraction part that it has only provided course signal i.e. " branch " signal, and its precision is 10 ' (60 ' be 1 °).Repeater compass by accumulative total from " branch " signal of master compass again on the superposition initial value can obtain actual heading.Therefore concerning repeater compass, " branchs " signal can directly be measured, degree then lean on " branch " signal carry, giving up the throne accumulates.General what adopt is detection method by turn: when computer sampling speed was 10ms, its following rate was 16 °/s, did not satisfy the tracer request of 35 °/s of some compass.Method provided by the invention can reach the following rate of 45 °/s when the 10ms sampling rate.
The key concept of this method is: be divided into 6 signals with 1 °, carry occur in 5 (50 ' down with) in 0 variation, giving up the throne occurs in 0 to 5 the variation, this is general digit-by-digit method.In fact, considering that maximum magnitude is under the situation of 3 jumps, carry occurs in 5 → 1,5 → 2,4 → 0 simultaneously, in 4 → 1,3 → 0 the variation, the signal of giving up the throne occurs in 0 → 4, and 0 → 3,1 → 5,1 → 4, in 2 → 5 the variation, handle following rate by this method and can improve 3 times than digit-by-digit method.
According to above-mentioned thought, the main points of this program are the absolute values 13～16 of the difference of double sampling value before and after getting.If poor (absolute value) less than 3, then illustrates no-carry or the generation of giving up the throne.If difference for giving up the throne, then is a carry 19,22,26,27,29,30 for bearing then greater than 3 and for just.If difference equals 3, situation is comparatively complicated, it and situation last time relevant (being on duty equals at 3 o'clock, and its rotating speed must be very high, can not change direction in moment, thereby must be consistent with sense of rotation last time).Judge earlier last time to be carry or to give up the throne 20,21, if be carry last time, this minus tolerance, this also carry 25,28,32,34 then, otherwise this not-carry.If last time for giving up the throne, this principal-employment, then this also gives up the throne 23,24,31,33, otherwise this is not given up the throne.Because the advance and retreat bit flag is not rewritten, thereby be left the reference value when detecting next time.Program is revised integer-bit according to carry, the sign of giving up the throne, and fraction part is directly sent demonstration without computing.
Claims (3)
1. electronic compass, it is characterized in that it is by to receiving the signal conditioning circuit that the master compass excitation signal come and synchronizing signal or stairstep signal are handled from interface, being connected with the output terminal of signal conditioning circuit prevents that undesired signal from entering the buffer circuit of system, makes the signal of coming through buffer circuit become metering circuit and digital display circuit four parts that standard Transistor-Transistor Logic level signal carries out data processing and forms; Said signal conditioning circuit is made of divider resistance and ∏ mode filter or Γ mode filter.
2. according to the described electronic compass of claim 1, it is characterized in that said buffer circuit is to adopt photoelectricity to isolate to realize; Said metering circuit adopts microcomputer to realize.
3. according to the described electronic compass of claim 2, it is characterized in that the employed software of microcomputer in the said microcomputer measurement circuit be adopt that discrepancy in elevation criterion realizes promptly before and after absolute value 〉=1 of double sampling value difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113806 CN1088186C (en) | 1998-03-02 | 1998-03-02 | Electronic compass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98113806 CN1088186C (en) | 1998-03-02 | 1998-03-02 | Electronic compass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1227916A CN1227916A (en) | 1999-09-08 |
| CN1088186C true CN1088186C (en) | 2002-07-24 |
Family
ID=5223504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98113806 Expired - Fee Related CN1088186C (en) | 1998-03-02 | 1998-03-02 | Electronic compass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1088186C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175233A (en) * | 2011-01-27 | 2011-09-07 | 重庆长平机械厂 | Automatic tracking compass repeater |
-
1998
- 1998-03-02 CN CN 98113806 patent/CN1088186C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175233A (en) * | 2011-01-27 | 2011-09-07 | 重庆长平机械厂 | Automatic tracking compass repeater |
| CN102175233B (en) * | 2011-01-27 | 2012-07-25 | 重庆长平机械厂 | Automatic tracking compass repeater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1227916A (en) | 1999-09-08 |
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