Spaceborne Absolute Photoelectric Encoder Coarse Code Decoding Circuit and Adaptive Sampling Method Using the Circuit
A self-adaptive sampling, photoelectric code disc technology, applied in special recording/indicating devices, mitigating undesired effects, measuring devices, etc., can solve the problems of complex circuit structure, low sampling accuracy, and high bit error rate, and achieve simplification The effect of hardware circuit, improving equipment reliability and simplifying circuit structure
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specific Embodiment approach 1
[0031] Specific implementation mode one: see figure 2 Describe this embodiment, the satellite-borne absolute type photoelectric code disc coarse code decoding circuit described in this embodiment, it includes photoelectric code disc 1, No. 1 sampling resistor 2, fine code and medium fine code decoding module 3, No. 2 Sampling resistor 4, current limiting resistor 5 and DSP processor 6;
[0032] The precise code photocurrent signal output terminal of the photoelectric code disc 1 is connected with one end of the No. 1 sampling resistor 2 and the voltage signal input terminal of the fine code and medium-precision code decoding module 3 at the same time, and the other end of the No. 1 sampling resistor 2 connected to the power ground,
[0033] The digital signal output end of fine code and medium fine code decoding module 3 is connected with the fine code digital signal input end of DSP processor 6,
[0034] The control signal output end of the DSP processor 6 is connected wit...
specific Embodiment approach 2
[0037] Specific implementation mode two: see figure 2 To illustrate this embodiment, the photoelectric code disc coarse code adaptive sampling method realized by the satellite-borne absolute photoelectric code disc coarse code decoding circuit described in the first specific embodiment, the coarse code adaptive sampling method includes the following steps:
[0038] Step 1: Under the condition of 18°C to 25°C, use an oscilloscope or a voltmeter to obtain the reference comparison voltage a of the rough code voltage of the photoelectric code disc 1;
[0039] Step 2: After the system is powered on, set the average comparison voltage m=0, power-on initialization time Time=0,
[0040] Step 3: Make the sampling count value n=1, and the sum of the sampling voltages sum=m;
[0041] Step 4: the coarse code voltage signal input terminal of the DSP processor 6 is to the received coarse code voltage u i To read, every time the coarse code voltage u is read i ;
[0042] Step 5: Updat...
specific Embodiment approach 3
[0050]Specific embodiment three: The difference between this embodiment and the photoelectric code disc coarse code adaptive sampling method realized by the satellite-borne absolute photoelectric code disc coarse code decoding circuit described in specific embodiment two is that in steps 4 and 5 Add step 41 between,
[0051] Step 41 is: judge u i with u i-1 is equal,
[0052] If the judgment result is yes, go to step 8
[0053] If the judgment result is no, then perform step five, where u i-1 Indicates the rough code voltage u i The last coarse code sampling voltage.
[0054] In this embodiment, in order to prevent the coarse pointing and tracking mechanism from staying at a certain fixed position for a long time, which will bring large errors to the calculation of the average comparison voltage m, the DSP processor uses the coarse code sampling decoding circuit and the fine code and medium fine code The decoding module reads the current value of the code disc, and mon...
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