US3852743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homodyne doppler radar with increased target sensitivity
Assignee: Bendix Corp
•
Filing: 1970-09-18
•
Granted: 1974-12-03
•
Expires: 1990-09-18
Abstract
Abstract A doppler radar system for detecting targets present within a short range is described. The radar system utilizes a Gunn diode which serves as both a transmitting oscillator and a frequency converter to produce the doppler frequency. A sensitivity optimizing element is placed between the Gunn diode cavity and the antenna to increase the target detection sensitivity, which is an increase in the doppler frequency output. Basically, the sensitivity optimizing element is a microwave discontinuity which is adjusted to optimize target detection sensitivity while maintaining sufficient power output from the Gunn diode.
Inventors
- 👤 R Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:15
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/03; G01S7/032
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
84 words
A homodyne doppler radar system having increased target detection sensitivity comprising: an oscillation generating and frequency converting means for generating a transmitted signal and mixing said transmitted signal with a received signal to produce a converted frequency; a transmitting-receiving antenna for transmitting said transmitted signal and receiving said received signal; variable discontinuity means interposed between said generating and mixing means and said antenna, said discontinuity serving to maximize the power level of said converted frequency to thereby increase the sensitivity of said radar system.
Claim 2
Dependent Claim
84 words
A homodyne doppler radar system having increased target detection sensitivity comprising: an oscillation generating and frequency converting means for generating a transmitted signal and mixing said transmitted signal with a received signal to produce a converted frequency; a transmitting-receiving antenna for transmitting said transmitted signal and receiving said received signal; variable discontinuity means interposed between said generating and mixing means and said antenna, said discontinuity serving to maximize the power level of said converted frequency to thereby increase the sensitivity of said radar system.
Claim 3
Dependent Claim
27 words
The Radar system of claim 1 further including a waveguide electrically coupling said generating and mixing means and said antenna, said discontinuity being positioned along said waveguide.
Claim 4
Dependent Claim
21 words
The radar system of claim 2 wherein said generating and mixing means includes a Gunn diode arranged in a resonant cavity.
Claim 5
Dependent Claim
31 words
The radar system of claim 3 further including an adjustable biasing source for further increasing the power level of said converted frequency, said biasing source being connected across said Gunn diode.
Claim 6
Dependent Claim
19 words
The radar system of claim 3 wherein said discontinuity includes at least one metallic screw extending into said waveguide.
Claim 7
Dependent Claim
31 words
The radar system of claim 5 further including an adjustable biasing source for further increasing the power level of said converted frequency, said biasing source being connected across said Gunn diode.
Claim 8
Dependent Claim
24 words
The radar system of claim 5 wherein there are two of said screws positioned apart at a quarter wavelength of said transmitted signal frequency.
Claim 9
Dependent Claim
71 words
A doppler radar system having a maximized target detection sensitivity comprising: single diode means for generating an RF signal and producing a doppler frequency upon reception of a reflected signal received from a target; an adjustable microwave discontinuity for maximizing the power level of said doppler frequency at the possible expense of decreasing the power level of said RF signal to thereby maximize the target detection sensitivity of said radar system.
Claim 10
Dependent Claim
71 words
A doppler radar system having a maximized target detection sensitivity comprising: single diode means for generating an RF signal and producing a doppler frequency upon reception of a reflected signal received from a target; an adjustable microwave discontinuity for maximizing the power level of said doppler frequency at the possible expense of decreasing the power level of said RF signal to thereby maximize the target detection sensitivity of said radar system.
Claim 11
Dependent Claim
28 words
The radar system of claim 8 wherein said single diode means for generating includes a Gunn diode, said Gunn diode simultaneously serving as an oscillator and a mixer.
Claim 12
Dependent Claim
31 words
The radar system of claim 9 further including an adjustable biasing source for further increasing the power level of said converted frequency, said biasing source being connected across said Gunn diode.
Claim 13
Dependent Claim
57 words
The radar system of claim 10 further including an antenna for transmitting said RF signal and receiving said reflected signal; and microwave means electrically connecting said Gunn diode and said antenna, said discontinuity being arranged to said microwave means so that adjustment of said microwave means optimizes said doppler frequency power while possibly decreasing said RF signal.
Claim 14
Dependent Claim
45 words
The radar system of claim 11 wherein said discontinuity includes a screw arranged to extend into said microwave means so that said screw causes an impedance mismatch which decreases said power level of said RF signal but maximizes the power level of said doppler frequency.
Claim 15
Dependent Claim
49 words
The radar system of claim 12 further including a second screw positioned in said microswitch means and spaced a quarter wavelength of said RF signal from said first screw, said second screw also extending into said microwave means to enable maximization of the power level of said doppler frequency.
References Cited (Backward Citations)
US3383682A
Cited
US3611374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |