Fan Chao

Design of the Measurement Node of the Grain Quantity Monitoring System Based on the CAN-bus

To need the requirement of measuring the grain quantity in the barn, the pressure sensors are mounted on the ground and the wall of the barn, and the grain quantity can be calculated by using these measurement values. To realize the data transmitting reliability and real time, the design proposal of the measurement node of the CAN-bus by using the chips of AT89C51 and the SJA1000 is put forward, and the design of software and the hardware of the node is given. To verify the effectivity and the reliability of the measurement node, some experiments are done, the results shown that, the measurement error is no more than 3% under the conspicuous level is equal to 0.05, the grain quantity can be measure by this system completely.

The Study of Acquisition Technology in the Grossness Field Inspection System of Stored-Grain

The paper proposed scheme and implement for the grossness inspection system of grain depot based on the actual demand of the system and the electrical confine analysis on the application environment. The test results is shown that, on the communication condition of 1Km distance and 5Kbps rate, the mistake code didn’t appeared and the measure error is less than 2.4% in the relative MSD, which can meet with the precision demand of the inspection system. The design should be served as the useful reference to the study of acquisition technology in similar system.

Study on the Real Time Log-domain Conversion for Detecting the Transient Feeble Optical Signal

Based on the properties of transient feeble optical signal, which is the wide dynamic range and the feeble lower limit signal, it is presented a novel detecting scheme compressing signal real-time in logarithmic domain in this paper. After the principle analysis of the scheme, it has been implemented to choose appreciate parts, design the circuitry and test. The results indicated that the approach can make transient optical signal ranged 120dB compress in the range of 0~5V. And together with the circuitry design simplified and the dissipation decreased, the troubles at the back data acquisition module can be lessened greatly. It may be a novel clue for research on the tech of detecting the transient light and provide certain reference values to similar system design.

The implement of the stored-grain grossness remote monitoring system based on GPRS and ZigBee

According to the actual demand of the system, the paper proposed scheme and implement for the stored-grain grossness remote monitoring system based on GPRS and Zigbee. The test result is shown that the max error is ∼0.02mA between inversion value of the server-side data and the measure value. The design should be served as the useful reference to the study of acquisition technology in similar system.

Influence Analysis of Jitter on Image Quality of Remote Sensing Camera

In order to analyze the influence of the satellite jitter on the image quality of the remote sensing camera, the image motion introduced by the low frequency sine jitter was given. The influence of the image motion along the roll, pitch and yaw direction on the image quality was studied chiefly. Finally, the degradation of the image quality caused by the jitter was computed concretely according to the datum come from two kinds of the emulation on the satellite kinetic jitter. The results showed that, with the increase of TDICCD integration number, the requirement of remote sensing camera for jitter amplitude is more stringent, and must be limited.