Target location systems
US4245220A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1979 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | Apr 12, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A target location system comprising a signal transmitter arrangement for transmitting pulses the frequency of which increase progressively during each pulse period from a frequency f to a frequency f+.DELTA.f and an echo signal receiver arrangement comprising a pair of echo signal receiver transducers arranged in spaced apart relationship, a first mixer having two input signal terminals fed from the said transducers one transducer being fed from each terminal, a second mixer via which one transducer of the pair is arranged to feed the first mixer, the second mixer being fed with a local oscillator signal, a first filter via which one sideband output signal from the said second mixer is fed to the said first mixer and a plurality of bandpass filters forming a filter bank fed from the first mixer, the filters of the bank each having a different passband or slot whereby all slots in aggregate cover a predetermined frequency band so that the bearing of a target from which an echo signal is received is indicated in accordance with the slot or slots in which the echo signal is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.