Radar frequency hopping
First Claim
1. In a Time Domain Downconversion Radar system having a system internal timing reference frequency and a display update period between range sweeps, a device comprising a frequency variable oscillator for adjusting the radar'"'"'s internal timing reference frequency, the oscillator being adapted to perform a frequency adjustment in said internal timing reference frequency during a plurality of the display update periods, wherein said frequency adjustment improves the co-locatability of multiple radars commonly located in a region.
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Accused Products
Abstract
Apparatus and methods for adjusting or “hopping” the center frequency or the pulse repetition frequency of a radar system improve the co-locatability of multiple radars commonly located in a region. In a Time Domain Downconversion (TDDC) or Ultra-Wideband (UWB) radar system having a display update period between range sweeps, the preferred device comprises a frequency variable oscillator for adjusting the radar'"'"'s internal timing reference frequency during a plurality of the display update periods. Radar frequency hopping methods and apparatus may result in improvements in interference immunity compared to other interference reduction techniques and may achieve cost reduction. In frequency hopping radar, if an actual target is present, the receiver waveform will repeat at the newly adjusted center frequency. Confirmation of a target is realized as an ongoing reflection and not interference.
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Citations
26 Claims
- 1. In a Time Domain Downconversion Radar system having a system internal timing reference frequency and a display update period between range sweeps, a device comprising a frequency variable oscillator for adjusting the radar'"'"'s internal timing reference frequency, the oscillator being adapted to perform a frequency adjustment in said internal timing reference frequency during a plurality of the display update periods, wherein said frequency adjustment improves the co-locatability of multiple radars commonly located in a region.
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14. A method of controlling a Time Domain Downconversion Radar system having a system internal timing reference frequency and a display update period between range sweeps, the method comprising:
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providing a frequency variable oscillator;
causing said frequency variable oscillator to perform a frequency adjustment during a plurality of the display update periods, so that the frequency adjustment improves the co-locatability of multiple radars commonly located in a region. - View Dependent Claims (15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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17. The method of claim 316 wherein said predefined pattern is every 2nd display update period.
Specification