HIGH FREQUENCY RADAR ALTIMETER
First Claim
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1. A method of track gate generation within a radar altimeter comprising:
- providing a stable waveform and a first set number of cycles to a first high frequency counter;
counting upon receipt of a start pulse to the first set number of cycles of the waveform and closing a track gate at that time;
providing the stable waveform and a second set number of cycles to a second high frequency counter; and
opening the track gate when the second set number of cycles is reached.
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Abstract
In one aspect, a method of radar altimeter operation, the altimeter including a high frequency counter coupled to a processor is described. The method comprises providing a continuous wave to the high frequency counter upon receipt of a transmit pulse, counting the cycles of the continuous wave, discontinuing counting of the continuous wave cycles upon receipt of a return pulse, outputting a count from the high frequency counter to the processor, and operating the processor to convert the count to an altitude.
28 Citations
15 Claims
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1. A method of track gate generation within a radar altimeter comprising:
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providing a stable waveform and a first set number of cycles to a first high frequency counter; counting upon receipt of a start pulse to the first set number of cycles of the waveform and closing a track gate at that time; providing the stable waveform and a second set number of cycles to a second high frequency counter; and opening the track gate when the second set number of cycles is reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A precision track gate generator comprising;
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a phase locked loop (PLL) circuit configured to provide a stable waveform to a first and a second high frequency counter; a processor configured to provide a first set number of pulses to said first high frequency counter and a second set number of pulses to said second high frequency counter; said first high frequency counter configured to count pulses of the waveform and signal the start of a track gate pulse upon reaching the first set number of pulses; and said second high frequency counter configured to count pulses of the waveform and signal the end of the track gate pulse upon reaching a second set number of pulses. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification