Method and apparatus for bandwidth selection for radar transmission

• US 10,101,436 B2
• Filed: 08/11/2015
• Issued: 10/16/2018
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: United States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Martone, Anthony F., Ranney, Kenneth I., Dogaru, Traian V., Sherbondy, Kelly D.
• Primary Examiner(s): Windrich, Marcus E
• Application Number:
  US14/822,949
• Publication Number:
  US 20180074165A1
• Time in Patent Office: 1,162 Days
• Field of Search: 342159-164
• CPC Class Codes: G01S 13/26 wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
• CPC Class Codes: G01S 7/023 Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36
• CPC Class Codes: G01S 7/282 Transmitters
• CPC Class Codes: G01S 7/40 Means for monitoring or calibrating
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks

Abstract

A method for optimizing bandwidth selection of a radar transmission in a frequency bandwidth in which the frequency bandwidth is divided into a plurality of sub-bands having a plurality of different bandwidths. The energy level is measured for each sub-band and a range resolution is also determined for each sub-band. Thereafter, a sub-band is selected in the frequency range where the signal to interference plus noise ratio plus the range resolution is maximum. Thereafter, a radar transmission is transmitted in the selected sub-band with a bandwidth corresponding to the bandwidth of the selected sub-band.

Claims

1. A method for optimizing bandwidth selection of a radar transmission in a frequency range comprising the steps of:

subdividing said frequency bandwidth into plurality of equal width sub-bands, each sub-band forming a first tier of frequency sub-bands of a first bandwidth,

forming subsequent levels of tiers of frequency sub-bands, each sub-band in each subsequent tier having a bandwidth equal to the bandwidth of the sub-bands in the preceding tier times the level of the tier for every combination of contiguous frequency sub-bands in the first tier

measuring the signal to interference plus noise ratio level in each of said sub-bands and dividing the signal to interference plus noise ratio by the tier level,

determining a range resolution for each sub-band,

selecting a sub-band in said frequency range where the signal to interference plus noise ratio plus the range resolution is maximum, and

thereafter transmitting the radar transmission in said selected sub-band and with a bandwidth corresponding to the bandwidth and center frequency of said selected sub-band.

2. The method as defined in claim 1 wherein said selecting step comprises the step of normalizing said signal to interference plus noise ratio and said range resolution for each sub-band.

3. The method as defined in claim 2 wherein said selecting step further comprises the step of multiplying said signal to interference plus noise ratio and said range resolution by a weighing factor.

4. Apparatus for optimizing bandwidth selection of a radar transmission in a frequency range comprising:

means for subdividing said frequency bandwidth into a plurality of equal width sub-bands, each sub-band forming a first tier of frequency sub-bands of a first bandwidth,

means for forming subsequent levels of tiers of frequency sub-bands, each sub-band in each subsequent tier having a bandwidth equal to the bandwidth of the sub-bands in the preceding tier times the level of the tier for every combination of contiguous frequency sub-bands in the first tier

means for measuring a signal to interference plus noise ratio in each of said sub-bands further comprising the step of dividing the signal to interference plus noise ratio by the tier level,

means for determining a range resolution for each sub-band,

means for selecting a sub-band in said frequency range where the signal to interference plus noise ratio plus the range resolution is maximum, and

means for thereafter transmitting the radar transmission in said selected sub-band and with a bandwidth corresponding to the bandwidth and center frequency of said selected sub-band.

5. The apparatus as defined in claim 4 wherein said selecting means comprises means for normalizing said signal to interference plus noise ratio and said range resolution for each sub-band.

6. The apparatus as defined in claim 5 wherein said selecting means further comprises means for multiplying said signal to interference plus noise ratio and said range resolution by a weighing factor.