JPH0443039B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a signal processing device for an earth sensor mounted on an artificial satellite, in particular, in which electrical noise superimposed on a signal line is used as a reference signal for the control system of the artificial satellite. It is related to the function of eliminating things.

[Conventional technology]

FIG. 3 shows the configuration of a conventional earth sensor signal processing device.

In FIG. 3, 1 is a signal converter that converts the earth's infrared radiant energy into electrical signals, and 2 is a waveform processing electronic circuit that generates leading edge signals and trailing edge signals corresponding to the electrical signals generated by the signal converter 1. , 3 inputs the leading edge signal generated by the waveform processing electronic circuit section 2 and generates a leading edge pulse. 4 inputs the trailing edge signal generated by the waveform processing electronic circuit section 2. , a voltage comparator for detecting a trailing edge pulse that generates a trailing edge pulse, 5 a timer circuit that generates a gate control signal for a specified time period from the rising or falling edge of the leading edge pulse, 6 a gate circuit, and 7 a signal 8 is an output signal line of the converter 1, 8 is an output signal line of the waveform processing electronic circuit 2, 9 is an output signal line of the leading edge pulse detection voltage comparator 3, and 10 is the output of the trailing edge pulse detection voltage comparator 4. signal line, 11
1 is an output signal line of the timer circuit 5; 11 is an output signal line of the timer circuit 5; and 12 is an output signal line of the gate circuit 6.

A conventional signal processing device is configured as described above.
Signal waveforms generated on each signal line 7, 8, 9, 10, 11, and 12 are shown in FIGS. 4, 5, and 6.

In FIGS. 4, 5, and 6, 15 is a waveform generated on the output signal line 7 of the signal converter 1, and a voltage corresponding to the infrared energy incident on the signal converter 1 is generated. 4, 5, and 6, reference numeral 16 indicates a waveform generated on the output signal line 8 of the waveform processing electronic circuit section 2;
A leading edge signal is generated in response to the rising edge of the waveform, and a trailing edge signal is generated in response to the falling edge of the 15 waveform.

Further, it is assumed that negative polarity noise exceeding -B(V) is superimposed on the signal line 8 between the leading edge signal and the trailing edge signal.

4, 5, and 6, 17 is a leading edge pulse waveform generated on the output signal line 9 of the leading edge pulse detection voltage comparator 3, and the reference voltage A (V) set in the voltage comparator is A pulse corresponding to appears. 18 in Figures 4, 5 and 6.
is a trailing edge pulse generated on the output signal line 10 of the trailing edge pulse detection voltage comparator 4, and a pulse corresponding to the reference voltage -B (V) set in the voltage comparator appears. 4, 5, and 6, reference numeral 19 is a gate control signal generated on the output signal line 11 of the timer circuit 5, and the gate control signal 19 is generated for a specified time width based on the rise of the leading edge pulse waveform 17. It is appearing. In FIG. 4, the output time width of the gate control signal 19 approaches just before the falling timing of the trailing edge pulse 18, and the gate control signal 19 is output when noise occurs.
In FIG. 5, the output time width of the gate control signal 19 is within the falling timing of the trailing edge pulse 18, and the gate control signal 19 is not output even when noise occurs. In FIG. 6, the output time width of the gate control signal 19 exceeds the falling timing of the trailing edge pulse 18, and the gate control signal is output even when the trailing edge pulse 18 is issued. 20 in Figures 4, 5 and 6
is the output signal waveform generated on the output signal line 12 of the gate circuit 6. In FIG. 4, the noise pulse is removed from the output signal line 12, and only trailing edge pulses are generated. In FIG. 5, both a noise pulse and a trailing edge pulse are generated on the output signal line 12. In FIG. 6, neither noise nor trailing edge pulses are generated on the output signal line 12.

[Problem that the invention seeks to solve]

In the conventional signal processing device as described above, the earth scan time width of the earth sensor is maintained at a constant value, and the output time width of the gate control signal is set optimally, as shown in Fig. 4. Similarly, the negative polarity noise generated between the leading edge pulse generation time and the trailing edge pulse generation time is inhibited by the gate circuit 6, and only the trailing edge pulse passes through the gate circuit 6.
The signal is output to the signal line 12, inputted as control reference information to the control system of the artificial satellite, and used for normal control.

However, as shown in Figure 5, when the earth scan time width of the earth sensor fluctuates and becomes larger than the output time width of the gate control signal, if negative polarity noise occurs later than the output time width of the gate control signal, A negative polarity noise pulse is also output to the signal line 12 and is input as a control reference signal to the control system of the artificial satellite, causing a problem of causing malfunction of the control system. Furthermore, as shown in Fig. 6, when the earth scan time width of the earth sensor fluctuates and becomes smaller than the output time width of the gate control signal, the trailing edge pulse is also inhibited by the gate circuit 6 and is not output to the signal line 12, causing the satellite to Since no control reference signal was input to the control system, there was a problem that the control system became uncontrollable.

This invention was made to solve this problem, and when negative polarity noise is superimposed on the earth sensor signal line due to the earth sensor's own electronic circuit noise or electromagnetic interference of the signal line, the noise The purpose is to prevent error signals from being output to the control system as control reference signals.

[Means for solving problems]

The signal processing device according to the present invention provides a gate control signal time width control function in a timer circuit that outputs a gate control signal, and generates a gate control signal time width control signal for the timer circuit based on the earth scan period of the earth sensor. A gate time width control signal generator is provided to control the gate control signal time width generated by the timer circuit in synchronization with the earth scan period of the earth sensor.

[Effect]

In this invention, a gate control time width control signal synchronized with the earth scan period of an earth sensor generated by a gate time width control signal generator is transmitted to a timer whose gate control signal output time width can be controlled by the gate control time width control signal. By setting the output time width of the gate control signal input to the circuit and generated by the timer circuit to be slightly smaller than the earth scan time width of the earth sensor, the negative polarity generated between the leading edge pulse and the trailing edge pulse can be reduced. The noise is blocked by a gate circuit to prevent it from being output as a disturbance to the control system of the satellite, and only the trailing edge pulse is allowed to pass through the gate circuit and output as a normal control reference signal to the control system of the satellite.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention, in which numerals 1 to 4 and 6 to 12 are completely the same as the conventional device described above. 13 is a gate time width control signal generator, 14 is an output signal line of the gate time width control signal generator 13, and 5 is a timer circuit having a gate control signal time width control function. 7 in Figure 1,
The signal waveforms generated at 8, 9, 10, 11, and 12 are shown in FIG. In FIG. 2, the signal names and output waveforms of each signal line 15 to 18 are exactly the same as in the conventional device. In FIG. 2, 19 is a gate control signal waveform output to the output signal line 11 of the timer circuit 5, and its output time width is synchronized with the earth scan period of the earth sensor using the gate time width control signal generator 13. and control it to a value slightly smaller than the Earth scan period. 20 is an output signal waveform generated on the output signal line 12 of the gate circuit 6, in which negative noise pulses are always removed and only trailing edge pulses are generated.

〔Effect of the invention〕

As explained above, this invention controls the time width of the gate control signal in synchronization with the earth scan period of the earth sensor when the trailing edge pulse generated when the earth sensor scans the earth is used as a control reference signal for an artificial satellite. By doing so, negative polarity noise generated between the leading edge pulse generation time and the trailing edge pulse generation time is reliably prevented from passing through the gate circuit, and disturbances caused by negative polarity noise on the earth sensor signal line are prevented from controlling the satellite. This has the effect of preventing input into the system from causing malfunctions.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a voltage waveform diagram of each signal line in the configuration diagram shown in FIG. 1, and FIG. 3 is a configuration diagram showing a conventional earth sensor signal processing device. 4 to 6 are voltage waveform diagrams of each signal line in the configuration diagram shown in FIG. 3. In the figure, 1 is a signal conversion section, 2 is a waveform processing electronic circuit section, 3 is a voltage comparator for leading edge pulse detection, 4 is a voltage comparator for trailing edge pulse detection, 5 is a timer circuit,
6 is a gate circuit, 7 is an output signal line of the signal conversion unit 1, 8 is an output signal line of the waveform processing electronic circuit unit 2, 9 is an output signal line of the voltage comparator 3 for detecting leading edge pulses, and 10 is a trailing edge pulse Detection voltage comparator 4
11 is an output signal line of the timer circuit 5, 12 is an output signal line of the gate circuit 6, 13 is a gate time width control signal generator, 14 is an output signal line of the gate time width control signal generator 13, 15 is the voltage waveform generated on the signal line 7, 1
6 is the voltage waveform generated on the signal line 8, 17 is the voltage waveform generated on the signal line 9, 18 is the voltage waveform generated on the signal line 10, and 19 is the voltage waveform generated on the signal line 1.
1 is a voltage waveform generated on the signal line 12, and 20 is a voltage waveform generated on the signal line 12. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An earth sensor is mounted on an artificial satellite, and the earth sensor is made to scan the earth, and a signal conversion unit that converts earth infrared radiation into an electric signal is connected to the electric signal waveform processing electronic circuit unit and the waveform processing electronic circuit unit. A leading edge pulse or trailing edge pulse detection voltage comparator inputs the processed signal, and a leading edge pulse detected by the leading edge pulse detection voltage comparator inputs the leading edge pulse detected by the leading edge pulse detecting voltage comparator, and inputs the leading edge pulse detected by the leading edge pulse detecting voltage comparator. A timer circuit and a gate circuit are provided for outputting a continuous gate control signal for a specified time period from time, and the gate circuit is provided with a gate control signal generated by the timer circuit and the trailing edge pulse detection voltage comparator detected. In an earth sensor signal processing device inputting a trailing edge pulse, a gate time width control signal generator generates a signal to control the output time width of the gate control signal generated by the timer circuit in synchronization with the earth scan period of the earth sensor. An earth sensor signal processing device characterized in that: is provided between the trailing edge pulse detection voltage comparator and the timer circuit.