GB1343120A - Focusing control of synthetic aperture processing for side- looking radar - Google Patents
Focusing control of synthetic aperture processing for side- looking radarInfo
- Publication number
- GB1343120A GB1343120A GB1343120DA GB1343120A GB 1343120 A GB1343120 A GB 1343120A GB 1343120D A GB1343120D A GB 1343120DA GB 1343120 A GB1343120 A GB 1343120A
- Authority
- GB
- United Kingdom
- Prior art keywords
- doppler
- phase
- output
- frequency
- coupled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/9004—SAR image acquisition techniques
- G01S13/9011—SAR image acquisition techniques with frequency domain processing of the SAR signals in azimuth
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
1343120 Pulse radar NORTH AMERICAN ROCKWELL CORP 23 Dec 1970 61254/70 Heading H4D An airborne, ground-mapping, radar system having a side-looking synthetic antenna operates with doppler focusing of the receiver output. Due to the change in direction of a target relative to the radar, owing to aircraft movement, the doppler shift associated with the target will change, as will the time-phase of the doppler shift, due to changes in the slant-range. Thus, to correlate the doppler returns from a given target, means are provided to compensate dopplerfrequency and time-phase changes. The compensation means embodies an IF output which has a spectral distribution whose centroid differs from a preselected frequency by an amount corresponding to the doppler shift of the on-boresight returns received by antenna 18. Accordingly, a closed-loop doppler tracking system is provided, which tracks the centroid of the clutter frequencies. The closed-loop system incorporates a doppler frequency tracking means 25 coupled to the output of a mixer 10 through IF amplifier 13 and also coupled to a coherent source 15 of the preselected IF frequency, f IF , for generating an auxiliary local oscillator injection signal having a frequency #f dc indicative of the frequency difference between the inputs applied to the tracker 25. Coherent detection of the clutter-reference IF output from amplifier 13 is accomplished by means of a phase-sensitive detector 14 whose reference input 29 is coupled to the source 15. Interposed between source 15 and input 29 is a phase-shifter 30 for compensatory shifting the phase of the reference signal applied to input 29. A control input of the phase-shifter 30 is coupled to the output of a doppler replica generator 34. The compensation is progressively varied over a preselected number of pulse repetition intervals. Coherence between signals from a terrain target, for a given range bin, permits integration of the signals, over the doppler processing period, for achieving azimuth resolution using an azimuth cross-correlator.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6125470 | 1970-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1343120A true GB1343120A (en) | 1974-01-10 |
Family
ID=10486784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1343120D Expired GB1343120A (en) | 1970-12-23 | 1970-12-23 | Focusing control of synthetic aperture processing for side- looking radar |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1343120A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2175767A (en) * | 1985-05-28 | 1986-12-03 | Standard Telephones Cables Ltd | Radar systems |
CN103743403A (en) * | 2014-01-22 | 2014-04-23 | 中国船舶重工集团公司第七〇五研究所 | Calculating method of single-frequency signal reverberation center |
CN114608699A (en) * | 2022-03-07 | 2022-06-10 | 中国矿业大学 | Elevator head sheave vibration abnormity detection system and method based on millimeter wave radar |
-
1970
- 1970-12-23 GB GB1343120D patent/GB1343120A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2175767A (en) * | 1985-05-28 | 1986-12-03 | Standard Telephones Cables Ltd | Radar systems |
GB2175767B (en) * | 1985-05-28 | 1989-07-26 | Standard Telephones Cables Ltd | Radar systems. |
CN103743403A (en) * | 2014-01-22 | 2014-04-23 | 中国船舶重工集团公司第七〇五研究所 | Calculating method of single-frequency signal reverberation center |
CN114608699A (en) * | 2022-03-07 | 2022-06-10 | 中国矿业大学 | Elevator head sheave vibration abnormity detection system and method based on millimeter wave radar |
CN114608699B (en) * | 2022-03-07 | 2023-02-24 | 中国矿业大学 | Elevator head sheave vibration abnormity detection system and method based on millimeter wave radar |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |