Aiming at height location application of sonar altimeter

GPS and barometric altimeter

a kind of digital altimeter based on FPGA is developed

which has advantage of low cost

fast speed

low power consumption.FPGA is responsible for completion of sonar altimeter

GPS and barometric altimeter data acquisition

height information processing

barometric altimeter temperature compensation

and serial port output.After analyzing barometric altimeter error sources

compensation and correction of temperature drift of barometric altimeter are emphasized on.In order to verify design effect

the digital altimeter is tested

and test results show that the precision of digital altimeter in a low range can reach 0.1 m or so

for high altitude range error is 2

3 m after error compensation

which can

be used for general navigation field.