VNIR multi-spectral image sensor has wide applications in remote sensing and imaging spectroscopy. An image
spectrometer of a spatial remote programmable push-broom sensing satellite requires visible near infrared band
ranges from 0.4μm to 1.04μm which is one of the most important bands in remote sensing. This paper introduces a
method of design the driving system for 1024x1024 VNIR CCD sensor for programmable push-broom remote
sensing. The digital driving signal is generated by the FPGA device. There are seven modules in the FPGA program and all the modules are coded by VHDL. The driving system have five mainly functions: drive the sensor as the demand of timing schedule, control the AD convert device to work, get the parameter via RS232 from control platform, process the data input from the AD device, output the processed data to PCI sample card to display in computer end. All the modules above succeed working on FPGA device APA600. This paper also introduced several important keys when designing the driving system including module synchronization, critical path optimization.
An image spectrometer of a spatial remote sensing satellite requires shortwave band range from 2.1μm to 3μm
which is one of the most important bands in remote sensing. We designed an infrared sub-system of the image
spectrometer using a homemade 640x1 InGaAs shortwave infrared sensor working on FPA system which requires
high uniformity and low level of dark current. The working temperature should be -15±0.2 Degree Celsius. This
paper studies the model of noise for focal plane array (FPA) system, investigated the relationship with temperature
and dark current noise, and adopts Incremental PID algorithm to generate PWM wave in order to control the
temperature of the sensor. There are four modules compose of the FPGA module design. All of the modules are
coded by VHDL and implemented in FPGA device APA300. Experiment shows the intelligent temperature control
system succeeds in controlling the temperature of the sensor.
KEYWORDS: Field programmable gate arrays, Sensors, Control systems, Control systems design, Infrared sensors, Shortwaves, Field effect transistors, Remote sensing, Infrared radiation, Short wave infrared radiation
An image spectrometer of a spatial remote sensing satellite requires shortwave band ranging from 2.1μm to 3μm
which is one of the most important bands in remote sensing. We designed an infrared sub-system of the image
spectrometer using a homemade 640x1 InGaAs shortwave infrared sensor working on FPA system which requires
high uniformity and low level of dark current. The working temperature should be -15±0.2 Degree Celsius. This
paper compares three different kinds of methods to control temperature of the sensor. First design uses a
temperature control chip Max1978 from Maxim Company. Second design uses ADN8830 from ANALOG
Company. Third design is based on FPGA device APA300. Experiment shows that MAX1978 has driving mosfet
inside its chip which makes the stability is not appropriate for this homemade shortwave sensor. While the
ADN8830 the supply power is limited to 5V, which also limits the driving power of the chip, experiments show
that ADN8830 works very well when the voltage is below 5V, but the result is not acceptable when sensor demand
more driving current. The FPGA design covers all the disadvantages above, but it introduced a new problem, the
electrical circuit takes much more board resources than MAX1978 and ADN8830.
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