| 摘要 |
The present invention provides an improved vehicle-mounted sonar device for determining one or more plant yield characteristics, wherein the device comprises an ultrasonic transmitter for transmitting timed pulses of ultrasonic energy towards plant material at an angle up to about 20 degrees relative to the longitudinal shoot axis of plants, an ultrasonic receive for receiving echoes from the plant material, means for filtering the received echoes, a temperature sensor and computational means for correcting for the effect of variations in ambient temperature as determined by the temperature sensor, and optional means for reducing interference by moving parts of the vehicle to which it is mounted. The present invention also provides methods of using the improved vehicle sonar device and for calculating one or more plant yield characteristics. |
