| 摘要 |
A system for measuring the roll angle of a rotating projectile. The system includes a transmit system mounted on the projectile. The transmit system has a linearly polarized transmit antenna system, a first transmitter coupled to the transmit antenna system for transmitting a first transmit signal at a first frequency, and a second transmitter coupled to the transmit antenna system for transmitting a second transmit signal at a second frequency. The first frequency is different from the second frequency, and the first and second transmit signals are in phase coherency. The system further includes a receiver system located remotely from the projectile. The receiver system includes a linearly polarized receive antenna system for receiving the first transmit signal and the second transmit signal. A first receiver section is provided for receiving and downconverting the first transmit signal to provide a first receiver signal. A second receiver section is provided for receiving and downconverting the second transmit signal to provide a second receiver signal. The first and second receiver signals are in phase coherency. A roll angle processor is responsive to the receiver system for calculating the roll angle.
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