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A method of controlling a radar system by: receiving a radar return signal from a target and generating a range-Doppler target image signature of the target; selecting a spectral line within the range-Doppler target image signature from a modulation feature on the target which includes an effective

A method of controlling a radar system by: receiving a radar return signal from a target and generating a range-Doppler target image signature of the target; selecting a spectral line within the range-Doppler target image signature from a modulation feature on the target which includes an effective point scatterer; providing a range profile for the spectral line; obtaining a reference range profile of a reference point scatterer; and determining a difference between a power at a range shorter than a peak corresponding to the modulation feature in the range profile and a power at a corresponding range of the reference range profile. The method may further include controlling provision of the range-Doppler target image signature based on the difference.

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1. A method of controlling a radar system, the method comprising: receiving a radar return signal from a target and generating a range-Doppler target image signature of the target;selecting a spectral line within the range-Doppler target image signature from a modulation feature on the target which

1. A method of controlling a radar system, the method comprising: receiving a radar return signal from a target and generating a range-Doppler target image signature of the target;selecting a spectral line within the range-Doppler target image signature from a modulation feature on the target which comprises an effective point scatterer;providing a range profile for the spectral line;obtaining a reference range profile of a reference point scatterer; anddetermining a difference between a power at a range shorter than a peak corresponding to the modulation feature in the range profile and a power at a corresponding range of the reference range profile. 2. The method as claimed in claim 1, further comprising controlling provision of the range-Doppler target image signature based on the difference. 3. The method as claimed in claim 1, further comprising: determining whether the difference is above a threshold value; andat least one of in response to the difference not being above the threshold value, generating a first control signal arranged to cause provision of the range-Doppler target image signature, andin response to the difference being above the threshold value, generating a second control signal arranged to prevent provision of the range-Doppler target image signature. 4. The method as claimed in claim 1, wherein selecting a spectral line comprises: identifying one or more spectral lines comprising a signal power peak;generating a range profile for each said spectral line; andselecting a said spectral line having a range profile comprising a primary power peak and one or more secondary power peaks, and each said secondary power peak located at a shorter range that the primary power peak having a substantially lower power that the primary power peak. 5. The method as claimed in claim 4, wherein identifying one or more spectral lines comprises selecting the or each of the identified one or more spectral lines corresponding to a modulation feature not located on a skin of the target. 6. The method as claimed in claim 4, wherein selecting a said spectral line comprises selecting the spectral line comprising the highest signal power peak and the said range profile. 7. A method of controlling the provision of the range-Doppler target image signature of a target, the method comprising: receiving a range-Doppler target image signature of a target;identifying a spectral line within the range-Doppler target image signature from a modulation feature on the target which comprises an effective point scatterer;providing a range profile for a return from the modulation feature;obtaining a reference range profile of a reference point scatterer;determining a difference between a power at a range shorter than a peak corresponding to the modulation feature in the range profile and a power at a corresponding range of the reference range profile, andgenerating a control signal for changing a gain of the range-Doppler target image signature based on the difference, and transmitting the control signal to a signal power control apparatus,wherein the signal power control apparatus is configured to be controlled by the control signal and further configured to change the gain of the range-Doppler target image signature based on the control signal. 8. The method as claimed in claim 7, further comprising: determining whether the difference is above a threshold value; andwhere the difference is not above the threshold value, generating a first control signal arranged to cause provision of the range-Doppler target image signature, and, where the difference is above the threshold value, generating a second control signal arranged to prevent provision of the range-Doppler target image signature. 9. The method as claimed in claim 7, wherein identifying a spectral line comprises: identifying one or more spectral lines comprising a signal power peak;generating a range profile for each said spectral line; andselecting a said spectral line having a range profile comprising a primary power peak and one or more secondary power peaks, and each said secondary power peak located at a shorter range that the primary power peak having a substantially lower power that the primary power peak. 10. The method as claimed in claim 9, wherein identifying one or more spectral lines further comprises selecting the or each of the identified one or more spectral lines corresponding to a modulation feature not located on a skin of the target. 11. The method as claimed in claim 9, wherein selecting a said spectral line comprises: selecting the spectral line comprising a highest signal power peak and the said range profile. 12. The method as claimed in claim 7, further comprising: applying a gain to the range-Doppler target image signature of a target; andchanging the gain to be applied to generate a further range-Doppler target image signature based on the difference. 13. The method as claimed in claim 7, wherein the reference range profile comprises a linear reference range profile generated from a first radar return signal having a first signal power arranged to cause a radar receiver to operate linearly, and wherein the method further comprises providing an overdriven reference range profile generated from a second radar return signal having a second, higher power arranged to cause the radar receiver to operate in saturation. 14. A radar system comprising: receiver apparatus arranged to receive a radar return signal and to generate a range-Doppler target image signature; anda controller configured to: select a spectral line within the range-Doppler target image signature from a modulation feature on the target which comprises an effective point scatterer;provide a range profile for the spectral line;obtain a reference range profile of a reference point scatterer; anddetermine a difference between a power at a range shorter than a peak corresponding to the modulation feature in the range profile and a power at a corresponding range of the reference range profile. 15. The radar system as claimed in claim 14, wherein the controller is further configured to control provision of the range-Doppler target image signature based on the difference. 16. The radar system as claimed in claim 14, wherein the controller is further configured to: determine whether the difference is above a threshold value; andat least one of in response to the difference not being above the threshold value, generate a first control signal arranged to cause provision of the range-Doppler target image signature, andin response to the difference being above the threshold value, generate a second control signal arranged to prevent provision of the range-Doppler target image signature. 17. The radar system as claimed in claim 14, wherein the controller is further configured to: identify one or more spectral lines comprising a signal power peak;generate a range profile for each said spectral line; andselect a said spectral line having a range profile comprising a primary power peak and one or more secondary power peaks, such that each said secondary power peak located at a shorter range that the primary power peak has a substantially lower power that the primary power peak. 18. The radar system as claimed in claim 17, wherein the controller is further configured to: select the or each of the identified spectral lines corresponding to a modulation feature not located on a skin of the target. 19. The radar system as claimed in claim 17, wherein the controller is further configured to: select the spectral line comprising the highest signal power peak and the said range profile.