Measuring high and low waves with HF radar

HF radar measurements are presented focussing in particular on the estimation of wave parameters in both high and low sea conditions. In high sea conditions theory suggests that low radio frequencies are needed in order to make wave measurements whereas in low sea conditions, higher radio frequencies are required. The theory is reviewed and measurements used to demonstrate the impact of these theoretical limitations. Work in progress aimed at improving the accuracy of wave measurement in both high and low seas is discussed.